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An architectural avenue of electro-optical biosensor activities for the detection of formalin adulteration in preserved foods packaging


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1. Rajeswari. M, Lingayya Hiremath, , Anubha Samadder, Satheesh Babu Gandla, Nagashree N Rao and Ashwani Sharma 31 Jan 2021 na 33 0


Formalin is a highly toxic and hazardous agent but it is fraudulently added in food to prevent food spoilage. Recently, various cases were reported of difficulty in breathing, cancer, asthma, and allergy, damage of pulmonary, poisoning and even death due to consumption of formalin from food. Therefore, formaldehyde should not be used in any food products and to ensure formaldehyde free products, sensitive, simple and fast techniques for detecting formaldehyde in preserved food are increasingly important. For this purpose, a simple Electro-optical biosensor was developed. Electro-optical biosensor is Photovoltaic which gives output in the form of voltage by converting some amount of incident light into voltage. Light from LED passes through the sample and some part of it is absorbed by the sample. The sample also transmits some amount of light which falls on the LDR (photo detector) which generates a voltage proportional to the amount of light falling on it. The voltage is then converted to digital values by an ADC. This digital voltage values are then fed to a microcontroller, which is programmed to convert the voltage values to optical density which is displayed on the LCD. The detection limit ranges from 0.5 to 2 ppm. The proposed electro optical sensor has potential advantages owing to its rapid response with high reproducibility, high selectivity, repeatability, reliability and real- time procedure for analysis of formalin concentration.


Biosensor; Preserved food; Formalin; Electro-optical properties

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