Chromogenic acridinone enzyme substrate compounds comprising 7-hydroxy-9H-acridin-2-one chromogens derivatized at the 7-hydroxy-position with an enzymatically-cleavable group and disubstituted at the 9-position with alkyl or aryl groups, which can be the same or different, preferably lower alkyl or phenyl, respectively, or together form a cyclohexa-2,5-diene-4-one residue or a 4-hydroxycycloxhexyl residue, and 7-hydroxy-1,3-dihalo-9,9-dimethyl-acridin-2-one intermediates useful for the preparation of the novel chromogenic acridinone enzyme substrate compounds and methods therefor. The enzymatically-cleavable group is a radical of a compound Y-OH comprising an enzyme-specific moiety which is capable of being cleaved by a specific enzyme wherein a deprotonated form of the chromogen is liberated having an absorbance maximum in basic solution which is substantially greater than the absorbance maximum of the chromogenic acridinone enzyme substrate compound to provide a distinct change in absorbance which can be accurately measured and correlated to the amount of enzyme present in a liquid test sample.
                            含有7-羟基-9H-
吖啶酮色团的发色酶底物化合物,其在7-羟基位置上衍生出一个可被酶
水解的基团,并在9-位置上二取代为烷基或芳基,可以是相同的或不同的,优选为较低的烷基或苯基,或者一起形成环己-2,5-二烯-4-酮残基或
4-羟基环己基残基,以及用于制备新型发色酶底物化合物和方法的7-羟基-1,3-二卤-9,9-二甲基-
吖啶酮-2-酮中间体。酶
水解基团是化合物Y-OH的基团,其中包括能够被特定酶
水解的酶特异性基团,从而释放出色团的去质子化形式,在碱性溶液中具有显著高于发色酶底物化合物的吸收极大值,从而提供可精确测量并与液体测试样品中存在的酶量相关的吸收变化。