Carbon-based reusable wrapper to raise shelf life of fruits

Last Updated10/08/2021

Indian scientists have developed a composite paper made of carbon (graphene oxide) loaded with preservatives that can be used as wrappers to
help extend shelf life of fruits.
Unlike the present dipping technology, where preservatives are adsorbed by the fruit, causing chronic toxicity to the consumers; here the wrapper releases the preservative only when needed.
The wrapper can be reused, which is not possible with the present technology.

Fruits are highly perishable, hence 50% of fruits produced are wasted, causing huge losses.
Conventional preservation relies on coating the preservative with the resin, wax, or edible polymer, which may cause chronic health problems.
In order to address this problem, a team of researchers led by Dr. P. S Vijayakumar fromInstitute of Nano Science and Technology, Mohali, looked for an alternative that could be generated from waste and would not lead to adsorption of preservatives in the fruit.

The activated graphene oxide-loaded molecules were loaded with preservatives.
This high preservative-loaded graphene oxide, when cast into a paper used for fruit wrapping, ensures that the fruit is not loaded with toxic preservatives.
But when the fruit over-ripens or gets infested by pathogens, the acidity increases by the secretion of acids, citric, and oxalic acids trigger the release of the preservatives for the preservation of the fruit. Otherwise, the preservative stays with the carbon wrapper.
In the fruit dipping method, the preservative will be lost along with the fruit, whereas the wrapper can be reused after the consumption of the fruit for the preservation of the next batch of fruits.

This novel product can benefit the farmers and food industry by extending the shelf life of fruits.
Using this wrapper for the fruit will also ensure that the customer gets the fruits with healthy quality, as we have found improvement in the phenol content.
The production of this graphene fruit wrapper requires only the carbon produced from the heating of biomass and thus it will also benefit in biomass consumption and employment generation.