Scientists describe how they simulated knife motion, washing and scratching on bacteria-fighting, nanosilver-infused cutting boards to see if consumer use affects nanoparticle release. The test should help regulatory bodies identify if any safety or health risks exist from silver nanoparticles in kitchenware now being sold overseas, and if so, find ways to deal with them before the items are approved for sale in the United States.

Because of their antimicrobial and antifungal properties, silver nanoparticles measuring between one and 100 nanometers (billionth of a meter) in size, are being incorporated outside the United States into a variety of kitchen products known as food contact materials (FCMs).

Among the nanosilver-infused FCMs now on the market overseas are spatulas, baby mugs, storage containers, and cutting boards. However, the use of these items raises concerns that the nanoparticles in them will migrate into foods and the environment, and in turn, if this poses risks to human health.

To address these issues, government bodies around the world have published guidance documents, set policies and considered regulations. These have been largely based on research that examined nanosilver release from new, unused consumer products or laboratory surrogates, but not current FCMs during and after use. In a new paper, scientists describe how they simulated knife motion, washing and scratching on nanosilver- containing cutting boards to see if consumer use practices affect nanoparticle release.

Using a test method developed at NIST, five different "use scenarios" – each simulating a different type and level of wear commonly seen with human use – were conducted by moving three abrasive surfaces back and forth across samples of nanosilver-enabled cutting board material.

Safety or health risks 

The authors hope their test method will help regulatory bodies identify if any safety or health risks exist from silver nanoparticles in food contact materials, and if so, find ways to deal with them appropriately before they are approved for sale in the United States.

"A custom-designed razor blade replicated knife cuts, a piece of scrubbing pad mimicked normal dishwashing conditions and a tungsten carbide burr imitated scratching by metal utensils," said NIST physical scientist Keana CK Scott, one of the authors on the paper published in the journal  Food Additives and Contaminants: Part A. "The washing and scratching scenarios were done at one or two levels of abrasion; for example, 500 and 5,000 cycles for the scratching simulation."

Silver nanoparticles

FDA scientists also determined how much, if any, silver ions and intact silver nanoparticles would migrate away from cutting boards when exposed to water and acetic acid. They found that the concentrations of ionic and particulate silver found in both solutions were very low. In fact, there was no discernible difference in the silver migration observed from the new and unused nanosilver-enabled cutting boards compared with the ones that were cut, washed or scratched.

Based on their findings, the NIST and FDA researchers suggested that future studies should examine whether a combination of use scenarios would increase the amount of silver ions or nanoparticles released. 

"Now that we have shown that the migration evaluation method works, it can be used to help answer this and other questions about what happens when people use FCMs with nanoparticles," said NIST research chemist David Goodwin, another author on the paper. "In turn, those findings should be valuable to the bodies that must determine any health or safety risks."