With the application of the spray, peaches could see an extended shelf life of up to 10 days. (Image from http://www.cbc.ca/news/canada/kitchener-waterloo/guelph-fruit-spray-extends-shelf-life)
A large portion of global food waste occurs when fresh produce goes bad before we have the opportunity to buy or consume it. Produce often rots on grocery store shelves or in our fridges and fruit bowls, due to the long distances that food travels in our far-reaching food system. There are solutions to this issue, such as buying local and only purchasing produce that you need, but in case that these techniques don’t work (i.e. shipping fresh produce to remote communities) science, as usual, is there to save the day.
As a professor of plant science at the University of Guelph, Jay Subramanian understands all too well the swiftness with which picked produce can become inedible. Although there are currently a variety of protective coatings and waxes that are sprayed onto fruits and vegetables, Subramanian’s protective spray is innovative in its nanotechnology-based approach.
The spray is made from hexanol, a natural component in plants which inhibits the enzyme that breaks down cell walls, causing fruits and vegetable to shrivel and rot.
“Once the walls are protected, the cells are intact and so the whole fruit stays intact,”Subramanian said in an interview with CBC.
Prof. Jay Subramanian. (Photo by Martin Schwable. Image from news.uoguelph.ca)
The spray is perfectly safe for consumption and can be washed off. It can be applied as a spray one and two weeks before harvest, or the fruit can instead be dipped in a hexanol solution postharvest. The result? Fruit lasts up to 50% longer. According to Subramanian, bananas can last up to 40 days, mangos up to 23 and nectarines and peaches have an extended life of up to 10 days, on top of the usual one week they usually have to remain edible.
Subramanian’s project was funded by Global Affairs Canada, through the International Development Program. It also worked with partners in India, Sri Lanka, Kenya, Tanzania and Trinidad and Tabago. The spray is still being reviewed in Canada for commercial use, but the project has hopes of going international in the next four years.