PURDUE (US) — Exposing packaged liquids and fresh produce to an electrical field for just minutes might eliminate all traces of food borne pathogens.
Kevin Keener, a professor of food science at Purdue University, looked for new ways to kill harmful bacteria, such as E.coli and Salmonella, that contaminate foods and cause serious illnesses and deaths. His method uses electricity to generate a plasma, or ionized gas, from atmospheric gases inside the food package.
This process creates a wide variety of bacteria-killing molecules including ozone, nitrogen oxides, hydrogen peroxide, and others. These molecules only exist for a few hours and then revert back to the original atmospheric gas, leaving a bacteria-free product.
In findings published in the Journal of Applied Microbiology, Keener and researchers at the Dublin Institute of Technology demonstrated that sealed-package atmospheric plasma works well to kill bacteria in growth media. Their experiments showed that bacteria on these surfaces were eliminated with 20 seconds of treatment and 24 hours of exposure to the gases it creates. Keener says the cost of the process should be comparable to current chemical and heat treatments used to sanitize foods.
“Even in the most resistant bacteria-growing media, 45 seconds of treatment gave us complete elimination of the E. coli,” Keener says. “Under a microscope, we saw holes forming in the cell walls of the bacteria.”
Adapting the technology for liquids could allow development of portable devices to clean drinking water in areas with contamination or that lack other purification methods. It could also allow food processors to bottle juices without first heating them, a process widely used to kill bacteria that can alter products.
“This could be developed to allow you to achieve something similar to pasteurization without the heat and quality changes that occur with that process,” Keener says.
In Europe, especially, new methods are being sought as alternatives to washing foods in chlorine baths.
“Chlorine water works well on hard surfaces. But there can be issues if bacteria get inside organic matter on the produce, making chlorine ineffective,” Keener says.
Keener is working with researchers in Ireland and Spain to develop a precommercial system for larger-scale decontamination testing. After that, he would like to build a commercial system that could be used in food-processing plants. Future research will also consider how the process affects food quality.
“Results from recent testing of E. coli bacteria in liquid suspensions demonstrated significant bacterial reductions with no heating or visual color change.” Keener says. “This suggests that atmospheric cold plasma treatment may achieve a cold pasteurization process for liquid foods to extend shelf-life and improve safety.”
The European Community’s Seventh Framework program funded the research.
Source: Purdue University