A new product patented by Cal Poly prevents keeps sliced apples looking fresh. (Courtesy California Polytechnic State University)
A U.S. Department of Agriculture scientist has developed a sanitizing wash formulated with natural compounds that could help reduce foodborne illnesses caused by Escherichia coli, Listeria, or Salmonella on fresh-cut produce.
Food processors sometimes use chlorinated water or hydrogen peroxide-based washes to sanitize produce, but they are not always effective, according to the USDA. At home, washing produce before slicing it can help reduce the risk of illness, but bacteria can persist in cut pieces.
Dr. Dike Ukuku, food technologist at the Agricultural Research Service’s Food Safety and Intervention Technologies Unit in Wyndmoor, Pennsylvania, has developed a wash containing nisin, which is produced by lactic acid bacteria that are used in making buttermilk, cheese, and yogurt. Nisin is classified as Generally Recognized as Safe (GRAS) by the U.S. Food and Drug Administration.
Ukuku found that nisin, combined as a wash with sodium lactate, potassium sorbate, and EDTA (ethylenediaminetetraacetic acid) disodium salt dihydrate (which is commonly used as a preservative in processed foods and soft drinks), reduced the microbial populations without affecting the appearance, odor, or acceptability of the fruit.
The wash, which he calls Lovit, could be formulated into a spray and used by processors, restaurants, or others concerned about food safety.
Although Ukuku used primarily cantaloupes for his research, he found that the wash also slows browning on fresh-cut apples and enhances freshness of pears. He is patenting the wash and has a commercial partner interested in marketing it.
Meanwhile, scientists at California Polytechnic State University have developed a method to prevent browning of fresh-cut produce while also reducing the growth of aerobic bacteria, yeasts, and molds.
The formula, developed by Dr. Wyatt Brown and colleagues, contains calcium ascorbate, calcium propionate, and calcium chloride.
When applied to fresh-cut Granny Smith and Fuji apples, it prevented browning and growth of microorganisms for at least 21 days without altering the nature of the apples.
Cal Poly obtained a patent for the formula this year and is seeking licensees to commercialize it. •
Geraldine Warner was the editor of Good Fruit Grower from 1992-2015. During her tenure, she planned and prepared editorial content, wrote for the magazine, and managed the editorial team. Read her stories: Story Index