MUMBAI, India, Oct. 26 -- Intellectual Property India has published a patent application (202611113437 A) filed by Graphic Era Deemed To Be University on September 22, 2026, for A Sticker System And Method For Colorimetric Food Freshness Indication Using Anthocyanin Sensor Technology.
Inventors include Suyash Shekhar; and Dr. Royal Madan.
The application for the patent was published on October 23, 2026, under issue no. 43/2026.
Abstract: The invention relates to food packaging indicators and particularly to a layered sticker system having an adhesive backing, a support layer, an indicator paper, and a transparent gas-permeable protective layer, wherein the indicator paper comprises filter paper or absorbent paper impregnated with an anthocyanin-rich extract obtained from red cabbage leaves. Compared with conventional electronic or instrument-based freshness monitoring, the invention provides a low-cost, biodegradable, substantially electronics-free visual indicator that detects volatile basic compounds, including ammonia and amines, in package headspace and undergoes a visible color shift from purple to blue or blue-green and then to green or yellowish as spoilage progresses. The invention also covers preparation of the anthocyanin indicator paper and assembly of the sticker for attachment inside transparent lids or package walls. The principal use is freshness indication of perishable foods including meat, fish, milk, fruits, vegetables, and packed meals.
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