Abstract
A device based on the presence of polyphenol oxidase in potato ( Solanum tuberosum) tissue was set up to determine catechol. The sensor is realized by coupling a thin slice of potato tissue with a Clark electrode capable of measuring oxygen evolution from a catechol solution. In the concentration range 2.5 × 10 −5–2.3 × 10 −4 M there is perfect linearity between the electrode signal and catechol concentration in solution. The high stability and the reliability and reproducibility of the results, tested over a period longer than 3 months, and the sensitivity of the device towards mono- and polyphenol derivatives, allow the application of such a system in physiological and pharmacological quality control.
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