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Indian scientists find how to extend shelf life of eggs

Paper trays that are coated with silver nano particles can extend the shelf life of eggs by up to two weeks.

A scientist said on Wednesday that Paper trays which are coated with a “concoction” of silver nano particles created by Indian researchers can extend the shelf life of eggs by up to two weeks.

This development has been made by Indian researchers as to help small village farms so that it can store eggs for a longer period of time and sell them accordingly.

“It is a concoction made of silver, gelatin and chitosan and you could paint it or spray on the paper trays. You can store eggs after the spray dries off and the eggshell contamination by bacteria is reduced because silver has an antibacterial effect,” Gopal Dhinakar Raj, of Tamil Nadu Veterinary and Animal Sciences University (TANUVAS) in Chennai, told IANS.

He added that the reduced surface contamination can increase the shelf life of eggs from 10 to 14 days to 25 to 30 days.

As published in June, in the Bulletin of Materials Science, study points that “strong antimicrobial activity of the silver nano particles doped trays against commonly found bacteria on egg shells – Escherichia coli, Staphylococcus aureus, Streptococcus, and Salmonella species”.

Though it is easy to prepare, Raj said that the concoction can only be applied to paper trays.

Raj who is also the director of Transnational Research Platform for Veterinary Biological (TRPVB) added that,”The only drawback is it can’t be coated on plastic trays. The cost of application on a six-egg paper tray is around Rs 4 to Rs 5, and so if you recycle the trays then the cost goes down as a coated paper tray has a shelf life of around nine months. Cost could increase if you use single time”.

TRPVB is a partnership programme between Department of Biotechnology and TANUVAS.

“In village chicken farms, they get small numbers (only 5 to 10 eggs a day). With the coated paper trays, they can accumulate the eggs over a period of time and sell them,” he added.

Kaliyaperumal Viswanathan, M. Latha Mala Priyadharshini, Karuppasamy Nirmala and Muthusamy Raman are the other authors of the paper.

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