p-aminophenyl phosphate: an improved substrate for electrochemical enzyme immnoassay
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Add time:09/08/2019 Source:sciencedirect.com
An alternative substrate is described for enzyme immunosaasay with electrochemical detection. Alkaline phosphatase (EC.3.1.3.1) activity is determined by using p-aminophenyl phosphate as the enzyme substrate. Enzyme-generated p-aminophenol is detected amperometrically at a glassy carbon electrody by liquid chromatography with electrochemical detection. The oxidation potential obtained for the detectionof p-aminophenol is lower than that for phenol, the previously used substrate product. The detection limit for p-aminophenol is 0.20pmol. A detection limit of 30 pg ml-1 for digoxin and a 5-min incubationtime for the enzyme reaction were obtained with the new system.
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