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Blue Goose Biorefineries scales up production of cellulose nanocrystals (CNC) and more

Tuesday, May 7th, 2013

I last mentioned Saskatchewan’s (Canada) Blue Goose Biorefineries in a Jan. 22, 2013 posting about its activities with regard to cellulose nanocrystals. I’m a little late to the party but there’s an Apr. 11, 2013 news release on the Advanced Foods and Materials website which notes that Blue Goose Biorefineries’ production of cellulose nanocrystals (CNC also sometimes known as nanocrystalline cellulose, NCC) has been scaled up,

Advanced Foods and Materials (AFM) Canada and Blue Goose Biorefineries Inc. (BGB), are pleased to announce the successful scale up of biorefining technology for the production of high value microcrystalline cellulose (MCC), cellulose nanocrystals (CNC), lignin, and green platform chemicals from flax and hemp straw.

In collaboration with the University of Saskatchewan’s College of Agriculture and Bioresources Bioprocessing Pilot Plant, and POS Bio-Sciences, BGB’s proprietary Renewable Residuals RefiningTM (R3TM) biorefining technology was successfully scaled up to process 100 kg of pulp in a reaction volume of 2500L to produce microcrystalline cellulose and cellulose nanocrystals of high purity, along with lignin and green platform chemicals as by-products. Throughout this process, the technology has shown promising advantages over existing biorefining methods including cost, yield, environmental impact, and flexibility. Necessary process steps demonstrated include biomass preparation, dewatering and washing, reaction mixing and crystalline cellulose washing. The project also successfully demonstrated the spray drying of the cellulose crystals at POS Bio-Sciences.

It’s exciting to hear that there might be more production of CNC in Canada, as well as, microcrystalline cellulose, lignin, and other by-products,. It seems where CNC is concerned that demand exceeds supply (I get the occasional query from someone trying to find a supplier).

I have more information about Advanced Foods and Materials Canada in my Jan. 22, 2013 posting. As well, here are links to the POS Bio-Sciences website and more information about the University of Saskatchewan’s Bioprocessing Pilot Plant.

ETA May 7, 2013 4:30 pm PDT: Dr. Bernard Laarveld of Blue Goose Biorefineries (BGB) very kindly noted this in an email to me today,

… we are now planning to develop a pilot plant for the production of NCC (aka CNC) and MCC and are raising the funding. This development through BGB is more driven from the private sector in partnership with Advanced Food Materials Canada.  We intend to process about 500 kg  of flax or hemp straw per day, and this would generate about 250 kg per day of crystalline cellulose. BGB has an advantage through low cost of production.

Very exciting news and I wish the Dr. Laarveld and the folks at BGB all the best.

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Posted in agriculture, forestry, nanotechnology | No Comments »

Nonfood to food: transforming cellulose

Thursday, April 18th, 2013

With concerns about having enough food to feed everyone, the news that researchers from Virginia Tech have found a way to transform cellulose into starch is encouraging. From the Apr. 17, 2013 news item on Azonano,

A team of Virginia Tech researchers has succeeded in transforming cellulose into starch, a process that has the potential to provide a previously untapped nutrient source from plants not traditionally thought of as food crops.

Y.H. Percival Zhang, an associate professor of biological systems engineering in the College of Agriculture and Life Sciences and the College of Engineering, led a team of researchers in the project that could help feed a growing global population that is estimated to swell to 9 billion by 2050. Starch is one of the most important components of the human diet and provides 20-40 percent of our daily caloric intake.

The Apr. 15, 2013 Virginia Tech news release, which originated the news item, describes cellulose and some of the other benefits to be had from transforming it into starch,

Cellulose is the supporting material in plant cell walls and is the most common carbohydrate on earth. This new development opens the door to the potential that food could be created from any plant, reducing the need for crops to be grown on valuable land that requires fertilizers, pesticides, and large amounts of water. The type of starch that Zhang’s team produced is amylose, a linear resistant starch that is not broken down in the digestion process and acts as a good source of dietary fiber. It has been proven to decrease the risk of obesity and diabetes.

This discovery holds promise on many fronts beyond food systems.

“Besides serving as a food source, the starch can be used in the manufacture of edible, clear films for biodegradable food packaging,” Zhang said.  “It can even serve as a high-density hydrogen storage carrier that could solve problems related to hydrogen storage and distribution.”

The news release goes on to provide details about the new process,

“Cellulose and starch have the same chemical formula,” Zhang said. “The difference is in their chemical linkages. Our idea is to use an enzyme cascade to break up the bonds in cellulose, enabling their reconfiguration as starch.”

The new approach takes cellulose from non-food plant material, such as corn stover, converts about 30 percent to amylose, and hydrolyzes the remainder to glucose suitable for ethanol production. Corn stover consists of the stem, leaves, and husk of the corn plant remaining after ears of corn are harvested. However, the process works with cellulose from any plant.

This bioprocess called “simultaneous enzymatic biotransformation and microbial fermentation” is easy to scale up for commercial production. It is environmentally friendly because it does not require expensive equipment, heat, or chemical reagents, and does not generate any waste. The key enzymes immobilized on the magnetic nanoparticles can easily be recycled using a magnetic force.

Zhang designed the experiments and conceived the cellulose-to-starch concept. Zhang and Virginia Tech visiting scholar Hongge Chen are the inventors of the cellulose-to-starch biotransformation, which is covered under a provisional patent application. [emphasis mine] Chun You, a postdoctoral researcher from China at Virginia Tech, and Chen conducted most of the research work.

I think we’re still a long way from being able to munch on corn stalks instead of corn. Also, it’s with some interest I note the researchers’ patent application. Exactly what are they trying to patent?

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Canadian government withdraws from UN treaty, recycles old news, and undergoes a ‘muzzled’ science probe

Monday, April 8th, 2013

Every once in a while, there’s a slew of announcements that seem to reveal a pattern of sorts with regard to political doings. In this case, I’m looking at three announcements about recent moves by the  Canadian Conservative government and which seem, to me, curiously interlinked.

First there was the announcement (CBC Mar. 27, 2013 news item) that Canada is withdrawing from the United Nations Convention to Combat Desertification, in those Countries Experiencing Severe Drought and/or Desertification (to become the only country in the world not party to it) and its annual commitment of $350,000. The CBC Mar. 28, 2013 news item provided more detail,

Prime Minister Stephen Harper said less than one-fifth of the $350,000 Canada contributes to the UN Convention to Combat Desertification goes to programming.

“This particular organization spends less than 20 per cent — 18 per cent — of the funds that we send it are actually spent on programming, the rest goes to various bureaucratic measures.That’s not an effective way to spend taxpayers’ money,” Harper told MPs during question period Thursday.

…

The Canadian Press reported Wednesday [Mar. 27, 2013?] the UN secretariat that administers the program was unaware of Canada’s decision until contacted by its reporter.

A spokesperson for the Canadian International Development Agency (CIDA) [emphasis mine] told CBC News the head of the secretariat was informed of the decision on Monday [Mar. 25, 2013?], and written confirmation was delivered to the UN Secretary General’s office in New York the same day.

But a UN official in Bonn told CBC News that Canada notified the UN about its withdrawal “informally last week by telephone” and “this is not considered proper notification… or protocol.”

The proper protocol is to formally write to the UN Secretary General Ban Ki-moon in New York and formally provide a notice that Canada is withdrawing from the treaty.

Paul Heinbecker, a former Canadian ambassador to the UN and chief foreign policy advisor to Prime Minister Brian Mulroney, wrote an Apr. 1, 2013 essay for the Globe and Mail about some recent history between Canada and the UN, this latest withdrawal, and its implications (Note: A link has been removed),

Following the Harper government’s failure in 2010 to win a Canadian seat on the UN Security Council, its disregard of the UN gave way to disdain. Ottawa’s rare appearances at the UN have tended to stress what it regards as Canada’s uniquely “principled” foreign policy, bringing to mind U.S. Secretary of State Dean Acheson’s characterization of Canadian foreign policy in the fifties as “the stern voice of the daughter of God,” and cementing Canada’s long-standing reputation as global mother-in-law.

Because of the links between drought, land degradation, desertification and climate change, withdrawal from the Desertification Convention comes with potentially significant costs. …

Heinbecker develops this line of thought by noting that the withdrawal makes it seem that Canada does not care about climate change (let’s not forget the withdrawal from Kyoto protocol, the UN Convention on Climate Change, a UN initiative from which the Canadian Conservative government withdrew in 2011) and noting this,

Given that the government of Alberta as well as ministers and departments in Ottawa have been going to considerable effort and expense to argue in the U.S. that Canada does care, it is self-harming to hand America’s Keystone opponents a stick to beat the pipeline with.

Also, because the locus of most of the devastation arising from desertification is in Africa, walking away from a treaty whose creation was led by the Mulroney and Chrétien governments reinforces the impression that Ottawa no longer cares about Africa. It is an impression that this government also went to some trouble and expense to try to reverse. Further, because the worst destruction from desertification is happening in the Sahara region, abandoning the treaty sends a mixed signal about the security issues at stake in Mali and the Sahel, and about Canadian mining interests there as well.

Thankfully, Prime Minister Stephen Harper and the conservative government are ensuring that our annual $350,000 contribution, after 2014, will no be longer wasted on what they termed a ‘talkfest’. To combat this negative impression being made on the rest of the world, there’s been an announcement (Azonano Apr. 6, 2013 news item) recycling some old government news about monies for the second phase of the Canadian International Food Security Research Fund (CIFSRF),

 ”The Harper Government is committed to increasing food security to those most in need as part of Canada’s effective international assistance through investing in scientific research and innovation,” said Parliamentary Secretary Brown [Lois Brown]. “Canadian universities, businesses, and NGOs [nongovernmental organizations]  have expertise that they can share with the world. Together, we can use innovation to put an end to global hunger.”

The Canadian International Food Security Research Fund is a joint initiative between the Canadian International Development Agency (CIDA) and the International Development Research Centre (IDRC). [emphases mine] It supports innovative research partnerships between Canadian and developing-country researchers to respond to immediate food needs while increasing access to quality, nutritious food over the long term. Phase 2 will focus on connecting promising research results to public and private sector organizations that can get them to end users on a larger scale.

“IDRC and CIDA have a long history of supporting Canada’s leadership in agricultural research and innovation for development,” said Jean Lebel, Acting President of IDRC. “CIFSRF demonstrates our mutual commitment to achieving sustainable results that put Canada’s considerable experience in agricultural and nutrition science to work globally to ensure farmers have access to new technologies and specialized expertise to keep pace with the growing demand for food.  Through CIFSRF, we are also expanding Canada’s scientific base and contributing to the country’s science and technology strategy.”

The Canadian International Food Security Research Fund, first launched in 2009, currently supports 19 projects, bringing together some of the best researchers from 11 Canadian and 26 developing-country organizations, as well as partners from scientific, private sector and civil society organizations, to develop innovative solutions to improve global food security.

The part where it got really interesting for me was the April 4, 2013 article by Rick Westhead for  star.com about the funds some of which are bound for the University of Guelph as per its Apr. 5, 2013 news release about the matter. Not to be too confusing but the following excerpt is from the April 4, 2013 Westhead article,

Manish Raizada, a University of Guelph agriculture professor, is changing lives in India, Nepal and Sri Lanka by showing farmers how to boost crop yields with weeding and planting techniques and by adding new crops.

Other Canadian researchers are bolstering Ethiopia’s agriculture sector, introducing farmers to rhizobia, a bacteria that naturally adds nitrogen to the soil and helped Saskatchewan, nearly a century ago, become a leading soybean exporter.

Then there are Canadian-led efforts in India that use nanotechnology to improve the lifespan of mangoes, efforts that should help improve livelihoods in a country where half of children under five are malnourished. [In fact, this an India, Sri Lanka, and Canada effort which I mentioned in a June 21, 2012 posting and again in a Nov. 1, 2012 posting.]

…

For instance, McGurk [Dr. Stephen McGurk, IDRC director of agriculture programmes] said one government-funded project is helping lengthen the shelf life of mangoes by as much as two weeks by introducing a nanoparticle-based coating that prevents them from ripening as fast.

“That way they’re attractive when they get to market, not looking like pulp,” McGurk said. “That science, once it has been tried in India can be equally applied to fruits here like plums or raspberries.”

Interestingly, McGurk gives this quote to Westhead,

“In no way would Canadian scientists in the agriculture sector say they are muzzled,” said Stephen McGurk, director of IDRC’s agriculture programs. [emphasis mine] “We’re engaged outside our borders and doing research now that’s valuable to Canadians but has to prove its salt somewhere else first.”

What makes McGurk an interesting spokesperson regarding ‘muzzles and Canadian scientists’ is that he  is an economist and a sinologist who prior to his latest appointment as IDRC director of agriculture programmes seems to have lived in Asia for the last 12 years and given this career description is likely from the US originally (from the Oct. 9, 2012 IDRC announcement of McGurk’s appointment),

Stephen McGurk is a Sinologist and economist who has spent more than two decades studying Asia’s rural development.Since 2006, he has been Director of IDRC’s Regional Office for South Asia and China in New Delhi (now the Asia Regional Office). From 2000 to 2006, he led IDRC’s office in Singapore.

Before joining IDRC, McGurk worked with the Ford Foundation in Beijing, where he was responsible for its economic security program in China. He has also taught at the University of California and worked with the World Bank on investments in China’s rural development. McGurk has a PhD from Stanford University’s [California] Food Research Institute.

I am curious as to how Dr. McGurk comes by his information about Canadian government agricultural scientists and their views on muzzles or lack thereof.

In looking at all of these bits of information, the desertification treaty withdrawal seems odd, almost as if it were designed to divert attention from something else the Conservative government is doing. Or, perhaps it’s an example of meanspirited shortsightedness something this government has been accused of before.

The recycled news item seems like it might not be as helpful as one would hope, although governments of all stripes are known to announce monies for projects that have been previously announced making it seem that a great deal more money is being dispersed than is the case. These announcements are always excellent for distraction but one would think the government would be eager to emphasize funding for projects in African countries rather than Asian countries given the conservatives’ current public relations problems in that region, as noted by Heinbecker.

As for McGurk’s quote about muzzles and agricultural scientists, while it does seem a bit ‘facey’ of him, he, at least, is not afraid to say something (although it’s not clear why he was asked about the muzzle since the news release was strictly about funding). For more about the ‘muzzles’,  there’s this excerpt from the Apr. 2, 2013 Canadian Press news item found at macleans.ca on campus,

Federal policies that restrict what government scientists can say publicly about their work are about to be put under the microscope.

Federal Information Commissioner Suzanne Legault has agreed to investigate how government communications rules on taxpayer-funded science impact public access to information.

Legault is responding to a detailed complaint lodged by the Environmental Law Centre at the University of Victoria and the ethics advocacy group Democracy Watch.

Their lengthy report — “Muzzling Civil Servants: A Threat to Democracy?” — laid out repeated examples of taxpayer-funded science being suppressed or limited to pre-packaged media lines across six different government departments and agencies.

…

Chris Tollefson, the executive director of UVic’s law centre, said their research into suppressed science revealed both the wide scope of the practice and that it “represents a significant departure” in government practice over the last five to seven years.

…Gary Goodyear, the minister of state for science and technology, was not available Monday to defend Conservative practices. His office provided an email stating government scientists “are readily available to share their research with the media and the public.”

“Last year, Environment Canada participated in more than 1,300 media interviews, Agriculture and Agri-Food Canada issued nearly 1,000 scientific publications, and Natural Resources Canada published nearly 500 studies,” said the statement.

It came the same day that the Globe and Mail reported that the National Research Council declined to make available its lead engineer for a front page story on research into truck safety. [emphases mine]

“Great spin — but missing the point,” Democracy Watch’s Duff Conacher said of the government response.

“It’s not the number of documents, it’s what percentage of documents are being released.”

Truck safety? That seems an odd topic for which to suppress or restrict any discussion with the lead engineer. But then, why withdraw from a treaty to save $350,000? As for the recycled announcement about funding for food and agriculture projects in Asia when you have substantive perception issues regarding  Africa and having someone who hasn’t lived in the country for 12 years defending your policies, the whole thing seems rather inept.

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Posted in agriculture, food, nanotechnology, science communication, science policy | No Comments »

Silver nanoparticles, water, the environment, and toxicity

Thursday, February 28th, 2013

I am contrasting two very different studies on silver nanoparticles in water and their effect on the environment to highlight the complex nature of determining the risks and environmental effects associated with nanoparticles in general. One piece of research suggests that silver nanoparticles are less dangerous than other commonly used forms of silver while the other piece raises some serious concerns.

A Feb. 28, 2013 news item on Nanowerk features research about the effects that silver nanoparticles have on aquatic ecosystems (Note: A link has been removed),

According to Finnish-Estonian joint research with data obtained on two crustacean species, there is apparently no reason to consider silver nanoparticles more dangerous for aquatic ecosystems than silver ions.

The results were reported in the journal Environmental Science and Pollution Research late last year (“Toxicity of two types of silver nanoparticles to aquatic crustaceans Daphnia magna and Thamnocephalus platyurus”). Jukka Niskanen has utilised the same polymerisation and coupling reactions in his doctoral dissertation studying several hybrid nanomaterials, i.e. combinations of synthetic polymers and inorganic (gold, silver and montmorillonite) nanoparticles. Niskanen will defend his doctoral thesis at the University of Helsinki in April.

The University of Helsikinki Feb. 28, 2013 press release written by Minna Merilainen and which originated the new item provides details about the research,

“Due to the fact that silver in nanoparticle form is bactericidal and also fungicidal and also prevents the reproduction of those organisms, it is now used in various consumer goods ranging from wound dressing products to sportswear,” says Jukka Niskanen from the Laboratory of Polymer Chemistry at the University of Helsinki, Finland.A joint study from the University of Helsinki and the National Institute of Chemical Physics and Biophysics (Tallinn, Estonia), Toxicity of two types of silver nanoparticles to aquatic crustaceans Daphnia magna and Thamnocephalus platyurus, shows that silver nanoparticles are apparently no more hazardous to aquatic ecosystems than a water-soluble silver salt. The study compared the ecotoxicity of silver nanoparticles and a water-soluble silver salt.

“Our conclusion was that the environmental risks caused by silver nanoparticles are seemingly not higher than those caused by a silver salt. However, more research is required to reach a clear understanding of the safety of silver-containing particles,” Niskanen says.

Indeed, silver nanoparticles were found to be ten times less toxic than the soluble silver nitrate - a soluble silver salt used for the comparison.

The bioavailability of silver varies in different test media

To explain this phenomenon, the researchers refer to the variance in the bioavailability of silver to crustaceans in different tested media.

University lecturer Olli-Pekka Penttinen from the Department of Environmental Sciences of the University of Helsinki goes on to note that the inorganic and organic compounds dissolved in natural waters (such as humus), water hardness and sulfides have a definite impact on the bioavailability of silver. Due to this, the toxicity of both types of tested nanoparticles and the silver nitrate measured in the course of the study was lower in natural water than in artificial fresh water.

The toxicity of silver nanoparticles and silver ions was studied using two aquatic crustaceans, a water flea (Daphnia magna) and a fairy shrimp ( Thamnocephalus platyurus). Commercially available protein-stabilised particles and particles coated with a water-soluble, non-toxic polymer, specifically synthesised for the purpose, were used in the study. First, the polymers were produced utilising a controlled radical polymerization method. Synthetic polymer-grafted silver particles were then produced by attaching the water-soluble polymer to the surface of the silver with a sulfur bond.

Jukka Niskanen has utilised such polymerisation and coupling reactions in his doctoral dissertation. Polymeric and hybrid materials: polymers on particle surfaces and air-water interfaces, studying several hybrid nanomaterials , i.e., combinations of synthetic polymers and inorganic (gold, silver and montmorillonite) nanoparticles....

It was previously known from other studies and research results that silver changes the functioning of proteins and enzymes. It has also been shown that silver ions can prevent the replication of DNA. Concerning silver nanoparticles, tests conducted on various species of bacteria and fungi have indicated that their toxicity varies. For example, gram-negative bacteria such as Escherichia coli are more sensitive to silver nanoparticles than gram-positive ones (such as Staphylococcus aureus). The difference in sensitivity is caused by the structural differences of the cell membranes of the bacteria. The cellular toxicity of silver nanoparticles in mammals has been studied as well. It has been suggested that silver nanoparticles enter cells via endocytosis and then function in the same manner as in bacterial cells, damaging DNA and hindering cell respiration. Electron microscope studies have shown that human skin is permeable to silver nanoparticles and that the permeability of damaged skin is up to four times higher than that of healthy skin.

While this Finnish-Estonian study suggests that silver nanoparticles do not have a negative impact on the tested crustaceans in an aquatic environment, there’s a study from Duke University suggests that silver nanoparticles in wastewater which is later put to agricultural use may cause problems. From the Feb. 27, 2013 news release on EurekAlert,

In experiments mimicking a natural environment, Duke University researchers have demonstrated that the silver nanoparticles used in many consumer products can have an adverse effect on plants and microorganisms.

…

The main route by which these particles enter the environment is as a by-product of water and sewage treatment plants. [emphasis] The nanoparticles are too small to be filtered out, so they and other materials end up in the resulting “sludge,” which is then spread on the land surface as a fertilizer.

…

The researchers found that one of the plants studied, a common annual grass known as Microstegium vimeneum, had 32 percent less biomass in the mesocosms treated with the nanoparticles. Microbes were also affected by the nanoparticles, Colman [Benjamin Colman, a post-doctoral fellow in Duke's biology department and a member of the Center for the Environmental Implications of Nanotechnology (CEINT)] said. One enzyme associated with helping microbes deal with external stresses was 52 percent less active, while another enzyme that helps regulate processes within the cell was 27 percent less active. The overall biomass of the microbes was also 35 percent lower, he said.

“Our field studies show adverse responses of plants and microorganisms following a single low dose of silver nanoparticles applied by a sewage biosolid,” Colman said. “An estimated 60 percent of the average 5.6 million tons of biosolids produced each year is applied to the land for various reasons, and this practice represents an important and understudied route of exposure of natural ecosystems to engineered nanoparticles.”

“Our results show that silver nanoparticles in the biosolids, added at concentrations that would be expected, caused ecosystem-level impacts,” Colman said. “Specifically, the nanoparticles led to an increase in nitrous oxide fluxes, changes in microbial community composition, biomass, and extracellular enzyme activity, as well as species-specific effects on the above-ground vegetation.”

As previously noted, these two studies show just how complex the questions of risk and nanoparticles can become.  You can find out more about the Finish-Estonian study,

Toxicity of two types of silver nanoparticles to aquatic crustaceans Daphnia magna and Thamnocephalus platyurus by  Irina Blinova, Jukka Niskanen, Paula Kajankari, Liina Kanarbik, Aleksandr Käkinen, Heikki Tenhu, Olli-Pekka Penttinen, and Anne Kahru. Environmental Science and Pollution Research published November 11, 2012 online

The publisher offers an interesting option for this article. While it is behind a paywall, access is permitted through a temporary window if you want to preview a portion of the article that lies beyond the abstract.

Meanwhile here’s the article by the Duke researchers,

Low Concentrations of Silver Nanoparticles in Biosolids Cause Adverse Ecosystem Responses under Realistic Field Scenario by Benjamin P. Colman, Christina L. Arnaout, Sarah Anciaux, Claudia K. Gunsch, Michael F. Hochella Jr, Bojeong Kim, Gregory V. Lowry,  Bonnie M. McGill, Brian C. Reinsch, Curtis J. Richardson, Jason M. Unrine, Justin P. Wright, Liyan Yin, and Emily S. Bernhardt. PLoS ONE 2013; 8 (2): e57189 DOI: 10.1371/journal.pone.0057189

This article is open access as are all articles published by the Public Library of Science (PLoS) journals.

For anyone interested in the Duke University/CEINT mesocosm project, I made mention of it in an Aug. 15, 2011 posting.

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Posted in agriculture, environment, nanotechnology, risk, water | 1 Comment »

Soybeans and nanoparticles redux

Tuesday, February 12th, 2013

If you read the Feb. 6, 2013 news release on EurekAlert too quickly you might not realize that only one of the two types of the tested nanoparticles adversely affects soybean plants,

Two of the most widely used nanoparticles (NPs) accumulate in soybeans — second only to corn as a key food crop in the United States — in ways previously shown to have the potential to adversely affect the crop yields and nutritional quality, a new study has found. It appears in the journal ACS Nano. [emphasis mine]

Jorge L. Gardea-Torresdey and colleagues cite rapid increases in commercial and industrial uses of NPs, the building blocks of a nanotechnology industry projected to put $1 trillion worth of products on the market by 2015. Zinc oxide and cerium dioxide are among today’s most widely used NPs. Both are used in cosmetics, lotions, sunscreens and other products. They eventually go down the drain, through municipal sewage treatment plants, and wind up in the sewage sludge that some farmers apply to crops as fertilizer. Gardea-Torresdey’s team previously showed that soybean plants grown in hydroponic solutions accumulated zinc and cerium dioxide in ways that alter plant growth and could have health implications.

The question remained, however, as to whether such accumulation would occur in the real-world conditions in which farmers grow soybeans in soil, rather than nutrient solution. Other important questions included the relationship of soybean plants and NPs, the determination of their entrance into the food chain, their biotransformation and toxicity and the possible persistence of these products into the next plant generation. Their new study, performed at two world-class synchrotron facilities — the SLAC National Accelerator Laboratory in California and the European Synchrotron Radiation Facility in Grenoble, France, addressed those questions. “To our knowledge, this is the first report on the presence of cerium dioxide and zinc compounds in the reproductive/edible portions of the soybean plant grown in farm soil with cerium dioxide and zinc oxide nanoparticles. In addition, our results have shown that cerium dioxide NPs in soil can be taken up by food crops and are not biotransformed in soybeans. [emphasis mine] This suggests that cerium dioxide NPs can reach the food chain and the next soybean plant generation, with potential health implications,” the study notes.

The University of Texas El Paso Feb. 6, 2013 news release provides more detail and more clarity about the results of the research ,

Experiments led by Jorge Gardea-Torresdey, Ph.D., of The University of Texas at El Paso (UTEP) have shown that certain man-made nanoparticles that land in soil can be transferred from the roots of plants to the grains, thus entering the food supply via crops grown for human consumption.

…

Cerium dioxide, which is commonly used in sunscreens and oil refining, remained intact when it was absorbed by the plant, and was transferred all the way into the edible soybean grains. [emphasis mine]

On the other hand, zinc oxide – commonly used in sunscreens and cosmetics – was transferred to the grain, but had broken down to a nontoxic form. [emphasis mine]

To track the nanoparticles’ route within the plants, the researchers used the intense beams of X-rays from the SLAC National Accelerator Laboratory’s Stanford Synchrotron Radiation Lightsource (SSRL) and the European Synchrotron Radiation Facility (ESRF) in Grenoble, France. The X-rays also helped reveal whether or not the nanoparticles were chemically transformed in the process.

While studies are under way, Gardea-Torresdey says there is currently little information on the potential health implications of nanoparticles.

UTEP has produced a video titled, UTEP Study Shows Engineered Nanoparticles Can Enter Food Supply. This piece, which features Gardea-Torresdey and a student,  seems to be less about the study and more about the benefits of studying at UTEP and the impact of the Latino community in the US,


Here’s a citation and a link to the article (Note: This work bears a remarkable resemblance to the work mentioned in my Aug. 20, 2012 posting about soybeans and nanoparticles, not least because the studies share three or more authors),

In Situ Synchrotron X-ray Fluorescence Mapping and Speciation of CeO2 and ZnO Nanoparticles in Soil Cultivated Soybean (Glycine max) by Jose A. Hernandez-Viezcas, Hiram Castillo-Michel, Joy Cooke Andrews , Marine Cotte , Cyren Rico, Jose R. Peralta-Videa, Yuan Ge, John H. Priester, Patricia Ann Holden, and Jorge L. Gardea-Torresdey. ACS Nano, DOI: 10.1021/nn305196q Publication Date (Web): January 15, 2013

Copyright © 2013 American Chemical Society

The article is behind a paywall.

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Industrial Biotechnology highlights nanotechnology applied to food and agriculture in the US

Tuesday, January 29th, 2013

The Dec. 2012 issue of Industrial Biotechnology featured a special research section highlighting innovative uses of nanotechnology in agriculture and food in the US. The Jan. 28, 2013 news release on EurekAlert provides more detail,

The U.S. Department of Agriculture (USDA) invests nearly $10 million a year to support about 250 nanoscale science and engineering projects that could lead to revolutionary advances in agriculture and food systems. …

In their introductory article, “Overview: Nanoscale Science and Engineering for Agriculture and Food Systems,” Co-Guest Editors Norman Scott, PhD, Professor, Cornell University (Ithaca, NY) and Hongda Chen, PhD, National Program Leader, National Institute of Food and Agriculture, USDA (Washington, DC), describe the promising early advances nanotechnology is enabling all along the food supply chain, from production through consumption, and especially in the area of food safety.

This special issue of IB [Industrial Biotechnology] includes the review article “Bioactivity and Biomodification of Ag, ZnO, and CuO Nanoparticles with Relevance to Plant Performance in Agriculture” by Anne Anderson and coauthors, Utah State University, Logan, in which they discuss the environmental factors that affect the biological activity and potential agricultural utility of nanoparticle. In the original research article “Effect of Silver Nanoparticles on Soil Denitrification Kinetics” Allison Rick VandeVoort and Yuji Arai, Clemson University (South Carolina), describe the effects of three different silver nanoparticles on native bacteria-mediated soil denitrification.

The short communication “Soft Lithography-Based Fabrication of Biopolymer Microparticles for Nutrient Microencapsulation” by Natalia Higuita-Castro, et al., The Ohio State University and Abbott Nutrition Products Division, Columbus, OH, describes a high-throughput microfabrication method to encapsulate nutrients that can enhance food nutritional value and appearance. Dan Luo and colleagues, Cornell University, Ithaca, NY, present a promising microfluidic-based scale-up method for cell-free protein production in the methods article “Cell-Free Protein Expression from DNA-Based Hydrogel (P-Gel) Droplets for Scale-Up Production.”

“The rapid expansion in nanoscale science and technology in our community with new insights and methods in biomolecular and cellular processing will spur industrial biotechnology innovation in a number of important sectors,” says Larry Walker, PhD, Co-Editor-in-Chief and Professor, Biological & Environmental Engineering, Cornell University, Ithaca, NY.

These articles are open access although I don’t believe that the journal is necessarily open access. Before I explain that further, here’s a bit more about the editors and the publisher,

About the Journal

Industrial Biotechnology, led by Co-Editors-in-Chief Larry Walker, PhD, and Glenn Nedwin, PhD, MBA, is an authoritative journal focused on biobased industrial and environmental products and processes, published bimonthly in print and online. The Journal reports on the science, business, and policy developments of the emerging global bioeconomy, including biobased production of energy and fuels, chemicals, materials, and consumer goods. The articles published include critically reviewed original research in all related sciences (biology, biochemistry, chemical and process engineering, agriculture), in addition to expert commentary on current policy, funding, markets, business, legal issues, and science trends. Industrial Biotechnology offers the premier forum bridging basic research and R&D with later-stage commercialization for sustainable biobased industrial and environmental applications.

About the Publisher

Mary Ann Liebert, Inc., publishers is a privately held, fully integrated media company known for establishing authoritative medical and biomedical peer-reviewed journals, including Metabolic Syndrome and Related Disorders, Population Health Management, Diabetes Technology & Therapeutics, and Journal of Women’s Health. Its biotechnology trade magazine, Genetic Engineering & Biotechnology News (GEN), was the first in its field and is today the industry’s most widely read publication worldwide. A complete list of the firm’s 70 journals, newsmagazines, and books is available on the Mary Ann Liebert, Inc., publishers website at http://www.liebertpub.com.

The publisher, Mary Ann Liebert, offers an open access option to authors and research funders, which means that for a fee, an article will be freely available online but (I strongly suspect) not all the articles in a journal issue are necessarily published under an open access agreement. In contrast, if it’s an article in a Wiley or Elsevier journal, you can be pretty much guaranteed that the online article is behind a paywall.

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Saskatchewan’s Blue Goose Biorefineries and cellulose at the nanoscale and microscale

Tuesday, January 22nd, 2013

Thank you to the reader who put me onto this Saskatchewan-based company that claims to produce nanoscale (sometimes called nanocrystalline cellulose [NCC] or nanocellulose crystals [CNC]) and microscale cellulose in an environmentally friendly fashion. From the Blue Goose Biorefineries’ home page,

BLUE GOOSE BIOREFINERIES INC. TM

Blue Goose Biorefineries Inc. introduces the R3TM (Renewable Residual Refining) technology and process to the Canadian marketplace.  R3TM is the world’s most advanced process and technology for the conversion of  carbon-based biomass into high-value, in-demand market commodities

 Economical, Sustainable, Efficient, Benign

 The Patent-Pending technology and process, together with closely held trade secrets, have created an entirely new, efficient and economically viable perspective on the treatment of biomass for the production of high value-added, sustainable and renewable commodities and energy sources.

 Microcrystalline Cellulose, Nanocrystalline Cellulose, Green Platform Chemicals

 Blue Goose Biorefineries Inc. is a Canadian innovation leader resolving environmental issues and generating economic opportunities through innovative, green, and renewable materials manufactured by our unique process and technology.

There doesn’t seem to be any information about the company’s management team, its products, or its technologies on its website. As well, the Blue Goose website does not host any press releases relating to company developments and/or business deals but there is a July 20, 2012 notice on the Advanced Foods and Materials (AFM) Canada website about a joint project,

Advanced Foods and Materials (AFM) Canada and Blue Goose Biorefineries Inc. (BGB) are pleased to announce they have been awarded a $500,000 grant from Agriculture and Agri-Food Canada’s Agricultural Innovation Program. The project will focus on the pre-commercialization and development of biorefining methods for flax and hemp straw in order to produce high value cellulose products, lignin, and green platform chemicals in Saskatchewan. BGB’s core technology is a “green chemistry” based, nano-catalytic biorefining process, Renewable Residuals RefiningTM (R3TM).  The R3TM process fractionates and breaks down the major components in lignocellulosic biomass: lignin, hemicellulose and cellulose. This green technology offers many process advantages over existing biorefining methods including cost, yield, environmental impact, and flexibility. Specifically, the technology offers a very strong industry transforming potential for the production of high value microcrystalline cellulose (MCC), nanocrystalline cellulose (NCC), lignin and green platform chemicals from flax and hemp straw.

The process has been proven at the lab bench scale for flax and hemp straw. Through this project, Advanced Foods and Materials Canada will manage institutional research activities and the pilot plant scale-up of the biorefining process. The production of larger quantities of bioproducts for testing, process development and lock-down including design parameters, engineering costs and tuning, will facilitate the development of a demonstration plant for Blue Goose Biorefineries. The impact of this project’s activities will add-value to Canadian hemp, flax and other cereal crops by creating a more efficient and economical source of high-quality MCC, NCC, lignin, and green platform chemicals for food, pharmaceutical, and industrial applications across North America.

Agriculture and Agri-Food Canada’s July 18, 2012 news release can be read here.

There is one other piece of information, Dr. Bernard Laarveld of the University of Saskatchewan lists Blue Goose Biorefineries as a current employer on his LinkedIn profile.

http://www.afmcanada.ca/event/BGBAIP

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Canada’s barley crop needs a little help to adapt to climate change

Tuesday, December 18th, 2012

“Building better barley” is the title for a Dec. 12, 2012 news release from the University of Alberta (by Bev Betkowski) on EurekAlert. They might have wanted to add the phrase “in the face of climate change” but that ruins the alliteration. From the news release,

As one of the top 10 barley producers in the world, Canada faces a problem of adapting to the ‘new normal’ of a warmer, drier climate.

The 2012 growing season was considered an average year on the Canadian Prairies, “but we still had a summer water deficit, and it is that type of condition we are trying to work with,” said Scott Chang, a professor of soil science in the University of Alberta’s Department of Renewable Resources in Edmonton, Canada.

The Dec. 5, 2012 article (which originated the news release) by Betkowski for the Faculty of Agricultural, Life and Environmental Sciences at the University of Alberta provides more detail about the why and the how,

Chang began teaming up with fellow crop scientist Anthony Anyia of Alberta Innovates – Technology Futures in 2006, following a severe drought in 2002 that dropped average crop yield in Alberta by about half. They are exploring the genetic makeup of barley and how the grain crop—a Canadian staple used for beer malt and animal feed—can be made more efficient in its water use and more productive. One of their latest studies, published in the journal Theoretical and Applied Genetics, explores how to increase yield in barley crops while using less water.

…The latest study was led by lead author Jing Chen, a former PhD student in Chang and Anyia’s lab. The group planted and harvested two common types of barley plants in test plots around Alberta, then analyzed the plants for genetic traits and other factors such as height, days to maturity and yield.

By studying the carbon isotope compositions of barley plants and their relationship with water-use efficiency, the researchers developed tools that plant breeders can use to improve selection efficiency for more water-efficient varieties. The latest findings stem from an ongoing collaboration that is ultimately aimed at bringing farmers a more stable breed of the plant that has less reliance on water and is less vulnerable to climate change.

Coincidentally (or not), the Canadian federal government in the person of Agriculture Minister Gerry Ritz, within a week of the story and news release by Betkowski, congratulates itself for previous funding and new programs in two separate news releases.

The Harper Government Supports Canadian Barley Industry news release of Dec. 7, 2012 had this comment for the Alberta Barley Commission’s annual general meeting in Banff,

“As the one-year anniversary of the adoption of the Marketing Freedom for Grain Farmers Act approaches, western Canadian grain farmers are already enjoying the economic potential of an open market,” said Minister Ritz. “I would like to thank the Alberta Barley Commission for its long-standing leadership in support of marketing freedom, innovation and a strong future for barley producers.”

Canadian barley, known around the world for its high quality and superior characteristics, generated over $270 million in exports last year—a figure expected to continue to grow with the new marketing freedom options. The Marketing Freedom for Grain Farmers Act, which received Royal Assent on December 15, 2011, allows anyone to buy and sell wheat and barley. By unleashing the sector’s economic potential and entrepreneurial energy, the open grain market continues to usher in a new era of innovation and growth for Western Canada’s grain industry, helping attract investment, encourage innovation, create value-added jobs and build a stronger economy.

Additionally, the Harper government recently announced an AgriMarketing investment of more than $525,000 to enable the Canadian Malting Barley Technical Centre, the Malting Industry Association of Canada, and the Brewing and Malting Barley Research Institute to increase their competitiveness in new and existing markets through innovative marketing and communications and through the development of a Canadian Malt Barley Brand. [emphasis mine] Product testing and evaluations will also be done on new malting barley varieties, the current year’s harvest and cargo shipments to highlight the attributes of the current Canadian crop for international customers.

The Harper government’s long-term strategy to strengthen and modernize the barley industry includes renewing the mandate of the Crop Logistics Working Group, to improve the performance of the supply chain for barley and all crops, and to ensure that the agricultural sector can reap the rewards of a dynamic and growing global marketplace.

On the same day in Calgary, the Harper Government Announces Federal Growing Forward 2 Programs news release of Dec. 7, 2012 proclaims new programs and, presumably, there will be additional funding at some point,

Agriculture Minister Gerry Ritz today unveiled three new federal programs under Canada’s new agricultural policy framework Growing Forward 2 that will streamline investments in the agriculture and agri-food sector. The new programs will focus on strategic initiatives in innovation, competitiveness and market development to further strengthen the sector’s capacity to grow and prosper.

“These new Growing Forward 2 programs will build on the success of existing programs to provide more streamlined support to the sector to help it remain a world leader in agricultural innovation and trade,” said Minister Ritz. “We are making sure farmers and the entire sector have the tools and resources they need to stay ahead of the ever-changing demands of consumers.”

Three new federal programs will come into effect on April 1, 2013:

  • The AgriInnovation Program will focus on investments to expand the sector’s capacity to develop and commercialize new products and technologies.
  • The AgriMarketing Program will help industry improve its capacity to adopt assurance systems, such as food safety and traceability, to meet consumer and market demands. It will also support industry in maintaining and seizing new markets for their products through branding and promotional activities.
  • The AgriCompetitiveness Program will target investments to help strengthen the agriculture and agri-food industry’s capacity to adapt and be profitable in domestic and global markets.

Agriculture and Agri-Food Canada is proactively providing information to farmers and the industry so that they are familiar with the kind of support that will be available and so they may plan their applications well in advance. The AgriInnovation Program will begin accepting applications immediately, while AgriMarketing and AgriCompetitiveness will begin accepting applications early in the new year.

Growing Forward 2 represents a $3 billion investment over five years in strategic initiatives for innovation, competitiveness and market development, in addition to a full and comprehensive suite of business risk management programs that will continue to help farmers withstand severe market volatility and disasters. Investments in the three priority areas are critical to facilitating the sector’s expansion and leveraging of provincial-territorial and industry investments to increase productivity, growth and jobs.

Canadian Prime Minister Stephen Harper, for those who do not know, is from the province of Alberta.

This is an interesting example, whether the announcements are coincidental or not, of the relationship between research taking place in the universities, government and its programmes, and the international marketplace. For those interested in Chang’s research, here’s the citation for the paper from his webpage,

Chen, J., Chang, S.X. and Anya, A.O. 2012. Quantitative trait loci for water-use efficiency in barley (Hordeum vulgare L.) measured by carbon isotope discrimination under rain-fed conditions on the Canadian Prairies, Theoretical and Applied Genetics 125: 71–90.

Springer, publisher for the journal Theoretical and Applied Genetics, is offering a free preview during the month of December 2012 so you can view the article or any other one in the journal ’til Dec. 31, 2012.

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FrogHeart at the 2012 S.NET conference, part 2: Canada, nano, and the mango

Thursday, November 1st, 2012

I was delighted to learn more about the nanotechnology collaboration between Canada, India, and Sri Lanka (mentioned in my India, Sri Lanka, and Canada team up for nanotechnology-enabled food packaging posting of June 21, 2012) at the S.Net 2012 conference.

Rumana Bukht and Sally Randles from the University of Manchester’s Business School titled their presentation, Intervention of the State on Responsible Development of Nanotechnology in Canada.

Before discussing the presentation, here’s a summary of the project from my June 21, 2012 posting,

From the June 20, 2012 University of Guelph news release,

University of Guelph scientists led by Prof. Jayasankar Subramanian will work with South Asian colleagues to develop innovative packaging using state-of-the-art nanotechnology to reduce post-harvest losses in mangoes, a vital fruit crop in South Asia.

The $2.3 million project, announced today by Canada’s International Development Research Centre (IDRC) and the Canadian International Development Agency (CIDA), will improve livelihoods for nearly one-third of the populations of India and Sri Lanka, mostly small-scale farmers.

The Guelph scientists will work with researchers from the Tamil Nadu Agricultural University in India and Sri Lanka’s Industrial Technology Institute.

…

“Invented in part at U of G, this new packaging system should reduce post-harvest losses in fruits in India and Sri Lanka, where optimal storage conditions are not readily available.”

Mangoes are the second largest fruit crop in India and third in Sri Lanka. Farmers lose 35 to 40 per cent of their crops ─ worth $800 million a year ─ because of poor storage.

The researchers will combine patented technologies to develop special fruit cartons, dividers and wraps lined with nanoparticles from coconut husks and banana plants. Using these farm waste products will help provide income for small-scale entrepreneurs, particularly women.

During her talk, Rumana mentioned hexanal as an important ingredient in this new packaging. While my notes don’t provide much information about this ingredient, I did find this great April 26, 2012 article by Arun P Mathew for the Times of India, which provides more technical detail,

K S Subramanian, head of the department of Nano Science and Technology, who is involved in the project said that the University of Guelph, Canada discovered that hexanal, a chemical extracted from plants could successfully enhance the shelf-life and quality of fruits and vegetables. A researcher at TNAU [Tamil Nadu Agricultural University] has come [up] with a nano-film, he said.

“A combination of these two technologies could help develop a nano film with hexanal, which will improve the longevity of these fruits. Through this technology, around 30 percent of the losses could be avoided. This will improve the export of fruits and vegetables and increase the sales of fruits making farming more economically viable,” he said. Subramanian said that they would first be applied on mangoes and later on other fruits, based on its success.

He said that this will be an eco-friendly product. “Hexanal has been approved by United States based, FDA ( Food and Drug Administration). …

Rumana noted there will be safety testing of this hexanal-based nano-film and the testing will take place in India (not Canada) because India has better safety equipment and personnel with the appropriate skill sets. Canada will contribute the safety protocols. If the mango project is successful, researchers are considering plums and peaches for future projects.

I did want to get more  information about this collaboration and about the Canadian nano scene. As I have noted many times, getting information is difficult and I gather Rumana experienced some of the same difficulties. At least, I’m inferring difficulty from the fact that she refused, due to confidentiality agreements, to tell me which Canadian government officials she’d spoken with although she did identify departments (Health Canada and Industry Canada). Given all the secrecy you’d think something nefarious was happening instead of an attempt to minimize food wastage.

Next: OECD (Organization for Economic Cooperation and Development) and public engagement at S.NET 2012

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Soybeans and nanoparticles

Monday, August 20th, 2012

They seem ubiquitous today but there was a time when hardly anyone living in Canada  knew much about soybeans.  There’s a good essay about soybeans and their cultivation in Canada by Erik Dorff for Statistics Canada, from Dorff’s soybean essay,

Until the mid-1970s, soybeans were restricted by climate primarily to southern Ontario. Intensive breeding programs have since opened up more widespread growing possibilities across Canada for this incredibly versatile crop: The 1.2 million hectares of soybeans reported on the Census of Agriculture in 2006 marked a near eightfold increase in area since 1976, the year the ground-breaking varieties that perform well in Canada’s shorter growing season were introduced.

Soybeans have earned their popularity, with the high-protein, high-oil beans finding use as food for human consumption, animal rations and edible oils as well as many industrial products. Moreover, soybeans, like all legumes, are able to “fix” the nitrogen the plants need from the air. This process of nitrogen fixation is a result of a symbiotic interaction between bacteria microbes that colonize the roots of the soy plant and are fed by the plant. In return, the microbes take nitrogen from the air and convert it into a form the plant can use to grow.

This means legumes require little in the way of purchased nitrogen fertilizers produced from expensive natural gas-a valuable property indeed.

Until reading Dorff’s essay, I hadn’t early soybeans had been introduced to the Canadian agricultural sector,

While soybeans arrived in Canada in the mid 1800s-with growing trials recorded in 1893 at the Ontario Agricultural College-they didn’t become a commercial oilseed crop in Canada until a crushing plant was built in southern Ontario in the 1920s, about the same time that the Department of Agriculture (now Agriculture and Agri-Food Canada) began evaluating soybean varieties suited for the region. For years, soybeans were being grown in Canada but it wasn’t until the Second World War that Statistics Canada began to collect data showing the significance of the soybean crop, with 4,400 hectares being reported in 1941. In fact, one year later the area had jumped nearly fourfold, to 17,000 hectares…

As fascinating as I find this history, this bit about soybeans and their international importance explain why research about soyboans and nanoparticles is of wide interest (from Dorff’s essay),

The soybean’s valuable characteristics have propelled it into the agricultural mix in many parts of the world. In 2004, soybeans accounted for approximately 35% of the total harvested area worldwide of annual and perennial oil crops according to the Food and Agriculture Organization of the United Nations (FAO) but only four countries accounted for nearly 90% of the production with Canada in seventh place at 1.3% (Table 2). Soymeal-the solid, high-protein material remaining after the oil has been extracted during crushing-accounts for over 60% of world vegetable and animal meal production, while soybean oil accounts for 20% of global vegetable oil production.

There’s been a recent study on the impact of nanoparticles on soybeans at the University of California at Santa Barbara (UC Santa Barbara) according to an Aug. 20, 2012 posting by Alan on the Science Business website, (h/t to Cientifica),

Researchers from University of California in Santa Barbara found manufactured nanoparticles disposed after manufacturing or customer use can end up in agricultural soil and eventually affect soybean crops. Findings of the team that includes academic, government, and corporate researchers from elsewhere in California, Texas, Iowa, New York, and Korea appear online today in the Proceedings of the National Academy of Sciences.

The research aimed to discover potential environmental implications of new industries that produce nanomaterials. Soybeans were chosen as test crops because their prominence in American agriculture — it is the second largest crop in the U.S. and the fifth largest crop worldwide — and its vulnerability to manufactured nanomaterials. The soybeans tested in this study were grown in greenhouses.

The Aug. 20, 2012 UC Santa Barbara press release has additional detail abut why the research was undertaken,

“Our society has become more environmentally aware in the last few decades, and that results in our government and scientists asking questions about the safety of new types of chemical ingredients,” said senior author Patricia Holden, a professor with the Bren School [UC Santa Barbara's Bren School of Environmental Science & Management]. “That’s reflected by this type of research.”

Soybean was chosen for the study due to its importance as a food crop –– it is the fifth largest crop in global agricultural production and second in the U.S. –– and because it is vulnerable to MNMs [manufactured nanomaterials]. The findings showed that crop yield and quality are affected by the addition of MNMs to the soil.

The scientists studied the effects of two common nanoparticles, zinc oxide and cerium oxide, on soybeans grown in soil in greenhouses. Zinc oxide is used in cosmetics, lotions, and sunscreens. Cerium oxide is used as an ingredient in catalytic converters to minimize carbon monoxide production, and in fuel to increase fuel combustion. Cerium can enter soil through the atmosphere when fuel additives are released with diesel fuel combustion.

The zinc oxide nanoparticles may dissolve, or they may remain as a particle, or re-form as a particle, as they are processed through wastewater treatment. At the final stage of wastewater treatment there is a solid material, called biosolids, which is applied to soils in many parts of the U.S. This solid material fertilizes the soil, returning nitrogen and phosphorus that are captured during wastewater treatment. This is also a point at which zinc oxide and cerium oxide can enter the soil.

The scientists noted that the EPA requires pretreatment programs to limit direct industrial metal discharge into publicly owned wastewater treatment plants. However, the research team conveyed that “MNMs –– while measurable in the wastewater treatment plant systems –– are neither monitored nor regulated, have a high affinity for activated sludge bacteria, and thus concentrate in biosolids.”

The authors pointed out that soybean crops are farmed with equipment powered by fossil fuels, and thus MNMs can also be deposited into the soil through exhaust.

The study showed that soybean plants grown in soil that contained zinc oxide bioaccumulated zinc; they absorbed it into the stems, leaves, and beans. Food quality was affected, although it may not be harmful to humans to eat the soybeans if the zinc is in the form of ions or salts, in the plants, according to Holden.

In the case of cerium oxide, the nanoparticles did not bioaccumulate, but plant growth was stunted. Changes occurred in the root nodules, where symbiotic bacteria normally accumulate and convert atmospheric nitrogen into ammonium, which fertilizes the plant. The changes in the root nodules indicate that greater use of synthetic fertilizers might be necessary with the buildup of MNMs in the soil.

At this point, the researchers don’t know how zinc oxide nanoparticles and cerium oxide nanoparticles currently used in consumer products and elsewhere are likely to affect agricultural lands. The only certainty is that these nanoparticles are used in consumer goods and, according to Holden, they are entering agricultural soil.

The citation for the article,

Soybean susceptibility to manufactured nanomaterials with evidence for food quality and soil fertility interruption by John H. Priester, Yuan Ge, Randall E. Mielke, Allison M. Horst Shelly Cole Moritz, Katherine Espinosa, Jeff Gelb, Sharon L. Walker, Roger M. Nisbet, Youn-Joo An, Joshua P. Schimel, Reid G. Palmer, Jose A. Hernandez-Viezcas, Lijuan Zhao, Jorge L. Gardea-Torresdey, Patricia A. Holden. Published online [Proceedings of the National Academy of Sciences {PNAS}] before print August 20, 2012, doi: 10.1073/pnas.1205431109

The article is open access and available here.

 

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