Electrogenerated chemiluminescence biosensor with alcohol dehydrogenase and tris(2,2'-bipyridyl)ruthenium (II) immobilized in sol-gel hybrid material.

An ethanol biosensor based on electrogenerated chemiluminescence detection was developed. Electrogenerated chemiluminescence reagent tris(2,2'-bipyridyl)ruthenium (II) and alcohol dehydrogenase were immobilized in the same sol-gel hybrid film. The copolymer poly(vinyl alcohol) with 4-vinylpyridine and cation exchanger Nafion were incorporated into sol-gel film to provide the microenvironment for retaining the activity of enzyme and immobilize tris(2,2'-bipyridyl)ruthenium (II). The design was simpler than the previous two-layer format. The experimental conditions, such as scan rate, pH and concentration of the cofactor were investigated. The intensity of electrogenerated chemiluminescence increased linearly with ethanol concentration from 2.5x10(-5) to 5.0x10(-2) M and detection limit was 1.0x10(-5) M. The prepared biosensor exhibited high sensitivity, wide linear range and good stability.

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