A starch–polyvinyl alcohol polymer film-based on-site sensor for ammonia: a cost effective day-to-day technique for monitoring fish and meat spoilage

M). The film-based sensor developed by immobilizing BP onto a starch-polyvinyl alcohol (PVA) matrix enabled both the rapid and visual onsite detection of ammonia and the determination of the RGB contents using a digital application. The blue content of the film linearly changed with the extent of the spoilage of fish and meat samples. This linear change enabled the film-based sensor to act as an excellent food quality indicator for hourly food quality monitoring. The aerial reversibility of the film empowered its use for many cycles without the use of any reagents.