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A biosensor is a molecular device that converts a biological response into a detectable measurable signal. A biosensor is formed from a sensor which could use different types of materials including the polymer and the bioreceptor, such as antibodies, enzymes, nucleic acid, etc., [54], is coupled with the sensor through different immobilizing techniques [54]. Different polymers are used to produce biosensors such as in antibacterial electrospun, dual fluorescence “turn-on” sensors of cysteine and silver ions, chitin nanofiber paper toward optical (bio)sensing applications, click off colorimetric detection of peroxide and glucose etc. [55].