On the basis of evaluation of indicator sensor in simulated indicator metabolite reactive model system, its use for monitoring food quality on real-time basis can be successfully made. The indicator sensor has important use in monitoring freshnessof protein-rich food especially muscle foods like fish, meat and other seafoods. The test results indicated the ability of sensor in assessing food’s freshness, as colour change in anthocyanins, which is a manifestation of sensor response and spoilage of protein-rich food during storage follows a similar trend (when the sensor changed green from red, the quality of muscle food deteriorates). Since upper limit of TVBN for spoilage of beef was around 20 mg/ 100 g [2], the amount of ammonia used for evaluation of indicator sensor was very low as compared to that produced in meat, fish, shrimp and different molluscs commonly available in India (protein-rich food). Hence, indicator sensor can be successfully used to evaluate food quality on real-time basis. Moreover, indicator sensor prepared from natural sources is free from any toxic effect even if consumed. The sensor may act as shelf-life-indicating device by mentioning the ‘‘best before’’ labelling, when attached to individual product units. This indicator sensor allows the food product to have an effective shelf life by permitting its quality and freshness to be monitored visually, consequently decreasing margins of error. It can also reduce the economic loss suffered by manufacturers due to spoilage of food during transport and storage as they can withdraw their product before it reaches to consumers and help to maintain their brand value in the market. The development of indicator sensor provides an opportunity for further work in this aspect, to analyse response of indicator sensor in food system and to develop new indicator sensors with higher sensitivity and nontoxicity to consumers. Moreover, extraction process can be made more efficient to extract natural dye from its parent source. Anthocyanin from other sources and other natural solutions capable of response towards volatile bases can be tried to develop other types of indicator sensors. Development of indicator sensor responsive towards metabolites other than TVBN released from food can also be tried. Besides, process, methods and raw materials of developed indicator sensor can be altered to increase its sensitivity.