Researchers at the University of British Columbia have just developed a liquid capable of eliminating most pesticides while prolonging the freshness of fruits. Their study, published in
ACS Nano, describes an approach that is both protective and accessible to all.
Even though pesticide residues remain regulated, they often persist in small amounts. Repeated consumption of the same fruit can then exceed certain recommended thresholds, especially in children. This concern motivated the scientific team to design an alternative more effective than conventional rinsing.
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The process relies on nanoparticles derived from starch, a compound found in corn or potatoes. Combined with iron and tannic acid, they form structures capable of adhering to pesticides. These assemblies act like microscopic sponges, capturing unwanted molecules on the surface of fruits.
Tested on apples, the solution removed between 86% and 96% of residues from three common pesticides. For comparison, tap water, baking soda, or starch alone typically remove less than half of these substances. This effectiveness marks a clear improvement over usual practices.
Beyond cleaning, the treatment includes a second immersion that deposits a thin edible coating. This film acts as a breathable barrier. It slows the browning of cut fruits and limits their dehydration during refrigerator storage.
The results are visible on different fruits. Sliced apples retain their appearance longer, while grapes remain firm for two weeks at room temperature. Quality indicators, such as acidity and soluble sugars, also remain at a higher level.
Another notable property, the coating has an antimicrobial effect. It inhibits the growth of certain bacteria, thus helping to extend shelf life. The iron input from the treatment remains well below the recommended daily limits, allowing for safe use.
The ingredients used being simple and inexpensive, this technology could be deployed on a large scale. The researchers estimate that its industrial application would add only a few cents per fruit. A domestic version, in the form of a spray or dissolvable tablet, is also being considered.