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1,5-bis(p-Hydroxybenzaldene)thiocarbohydrazone (BHBTZ) had been synthesized and used as a new kind of substrate for horseradish peroxidase (HRP). The experiment results showed that ascorbic acid (AsA) had strongly inhibiting effect on the BHBTZ-H(2)O(2)-HRP reaction system, so AsA had been spectrophotomericly determined as the inhibitor by enzymatic inhibition method. Under experimental conditions, the linear relationship between DeltaA(386) and AsA concentration was in the range of 0.82-18.0 microg ml(-1) with a detection limit of 0.245 microg ml(-1). The effect of interferences on AsA determination was investigated. The proposed method was successfully applied to the determination of AsA in tea drink.

Citation

Bo Tang, Yan Wang, Ming Du, Jie-Chao Ge, Zhen-Zhen Chen. Catalytic spectrophotometric determination of ascorbic acid in tea drink with 1,5-bis(p-hydroxybenzaldene)thiocarbohydrazone as the substrate for horseradish peroxidase. Journal of agricultural and food chemistry. 2003 Jul 16;51(15):4198-201

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PMID: 12848484

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