Catalytic Spectrophotometric Determination of Ascorbic Acid in Tea Drink with 1,5-bis(<i>p-</i>Hydroxybenzaldene)thiocarbohydrazone as the Substrate for Horseradish Peroxidase
作者:Bo Tang、Yan Wang、Ming Du、Jie-chao Ge、Zhen-zhen Chen
DOI:10.1021/jf030012e
日期:2003.7.1
1,5-bis(p-Hydroxybenzaidene)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-H2O2-HRP reaction system, so AsA had been spectrophotomericly determined as the inhibitor by enzymatic inhibition method. Under experimental conditions, the linear relationship between DeltaA386 and AsA concentration was in the range of 0.82-18.0 mug ml(-1) with a detection limit of 0.245 mug 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.