Mercapto compounds are determined by reacting the compound with a peroxidase or thiol oxidase reductase in the presence of a chromogen of the formula
wherein Y is hydrogen or hydroxyl; R1, R2 and R3 may be the same or different, and are groups represented by the following general formula (II), (III) or (IV):
wherein Z (which may be the same or different) is hydroxyl, amino, substituted amino, alkyl, substituted alkyl, alkenyl, aryl, substituted aryl, acyl, halogen, nitro, sulfo, carboxyl or alkoxy; n is 0, 1, 2 or 3; provided that at least one Z in R1, R2 and R3 is hydroxyl, amino, or substituted amino.
巯基化合物的测定方法是:在有以下式子的发色剂存在的情况下,使该化合物与
过氧化物酶或
硫醇氧化酶还原酶反应
其中 Y 为氢或羟基;R1、R2 和 R3 可以相同或不同,并且是由下式通式 (II)、(III) 或 (IV) 所代表的基团:
其中 Z(可以相同或不同)是羟基、
氨基、取代
氨基、烷基、取代烷基、烯基、芳基、取代芳基、酰基、卤素、硝基、磺基、羧基或烷氧基;n 是 0、1、2 或 3;条件是 R1、R2 和 R3 中至少有一个 Z 是羟基、
氨基或取代
氨基。