MUMBAI, India, Sept. 14 -- Intellectual Property India has published a patent application (202641106098 A) filed by Ms. Bitty Joseph; Prof. Dr. Ison V. Vanchipurackal; Ms. Annmary C; Dr. Simi N J; and Dr. Bharathi Bernadsha S on September 03, 2026, for Ph Responsive Fluorescent Pva-Carbon Dot Nanocomposite Film For Visual Detection Of Food Spoilage.
Inventors include Ms. Bitty Joseph; Prof. Dr. Ison V. Vanchipurackal; Ms. Annmary C; Dr. Simi N J; and Dr. Bharathi Bernadsha S.
The application for the patent was published on September 11, 2026, under issue no. 37/2026.
Abstract: The present invention provides a pH-responsive fluorescent nanocomposite film (PVA–CD film) for visual detection of food spoilage. The film comprises a poly(vinyl alcohol) (PVA) polymer matrix incorporated with carbon dots (CDs) green-synthesized by hydrothermal treatment of dried Phaleria macrocarpa fruit. The CDs exhibit excitation-dependent photoluminescence and pH-sensitive fluorescence intensity, attributed to oxygenated surface functional groups. The PVA–CD film displays a linear increase in photoluminescence intensity over the pH range of 2 to 10. When brought into contact with a food sample, the film functions as a solid-state optical pH probe: a decrease in pH associated with food spoilage produces a measurable and visually observable decrease in fluorescence intensity under UV illumination. Practical applicability is demonstrated for milk spoilage detection, where the film exhibits a fluorescence decrease correlated with progressive acidification of milk during storage. The film may be deployed as a disposable dip strip, a food-packaging indicator, or a component of a semi-quantitative colorimetric kit. The invention provides a low-cost, eco-friendly, and easily interpretable alternative to conventional food quality assessment methods, valorising agricultural fruit waste as a functional sensing material.
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