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In this work the polyphenol oxidase (PPO) was the main component of a biosensor for adrenaline determination. The activity of this enzyme was measured in several vegetables. Banana (Musa sp.) extracts presented better results with 974UA (units of activity). The biosensor was constructed with a polyethylene tube (0.8mm i.d.) filled with: carbon paste containing 50UA of the PPO in phosphate buffer (pH=7...
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