A team of engineers in Canada has developed a biodegradable fruit wash that tackles two persistent problems at once \u2013 pesticide residue and food spoilage.<\/p>\n
The solution removes most surface chemicals and helps fruit stay fresh for longer, offering a potential win for both food safety and household budgets in the United States.<\/p>\n
The research shows the wash removed more than 86 percent of pesticide residue in lab tests. <\/p>\n
It also slowed browning and moisture loss, extending the shelf life of treated fruit.<\/p>\n
\u201cOur goal was to create a simple, safe and affordable wash that improves both food safety and food quality,\u201d said senior author Dr. Tianxi Yang, an assistant professor in UBC\u2019s faculty of land and food systems.<\/p>\n
\u201cPeople shouldn\u2019t have to choose between eating fresh produce and worrying about what\u2019s on it.\u201d<\/p>\n
Even after rinsing, fruits and vegetables often carry trace pesticide residues.<\/p>\n
Regulators limit these levels, but repeated exposure remains a concern for frequent consumers.<\/p>\n
That concern drove the research. Dr. Yang began exploring alternatives after noticing her son\u2019s preference for large portions of fresh berries.<\/p>\n
The team designed the wash using starch-based particles from crops like corn and potatoes.<\/p>\n
They combined these with iron and tannic acid, a compound commonly found in tea and wine.<\/p>\n
This combination creates sticky, sponge-like structures. These structures bind to pesticide molecules and pull them off the fruit surface.<\/p>\n
Researchers tested the solution on apples coated with three common pesticides at real-world levels.<\/p>\n
The wash removed between 86 and 94 percent of residues. <\/p>\n
Standard methods like tap water, baking soda, or plain starch removed far less.<\/p>\n
Coating locks in freshness<\/p>\n
The process includes a second step that forms a thin, edible coating on the fruit.<\/p>\n
This layer works as a breathable barrier.<\/p>\n
It slows down oxidation and reduces water loss while allowing the fruit to respire naturally.<\/p>\n
Fresh-cut apples treated with the coating showed slower browning over two days in the refrigerator.<\/p>\n<\/p>\n
Grapes<\/a> stayed firm and plump for up to 15 days at room temperature. Untreated grapes shriveled much earlier.<\/p>\n \u201cThe coating acts like a breathable second skin. Measures of food quality like acidity and soluble sugars also remained higher in coated fruit,\u201d said Dr. Yang.<\/p>\n The coating also showed antimicrobial effects, helping limit the growth of harmful bacteria.<\/p>\n Researchers found that the process introduces only small amounts of iron.<\/p>\n These levels remain well within daily intake limits set by North American health authorities.<\/p>\n \u201cBeyond safety and shelf life, our formulation uses micronutrients like iron and phenolic compounds that offer additional health benefits,\u201d said Dr. Yang.<\/p>\n \u201cIt doesn\u2019t just reduce risk\u2014it can also add nutritional value.\u201d<\/p>\n Scaling beyond the lab<\/p>\n The team designed the solution for real-world use.<\/p>\n The ingredients are low-cost and mix easily in water, making the process suitable for commercial food systems.<\/p>\n Early estimates put the cost at about three cents per apple.<\/p>\n That matches existing commercial coatings while adding pesticide<\/a> removal.<\/p>\n Researchers are now refining the formula for large-scale processing.<\/p>\n They are also testing how it performs across different fruits and handling conditions.<\/p>\n The team sees potential for a home version as well.<\/p>\n