申请人:Kyowa Medex Co. Ltd.
公开号:EP0152274A2
公开(公告)日:1985-08-21
The present invention provides a method for the determination of leucine-aminopeptidase (hereinafter referred to as LAP) activity or Y-glutamyltranspeptidase (hereinafter referred to as γ-GTP) activity in a sample which comprises converting the substrate for the enzyme to be determined represented by the general formula (I):
wherein Z represents (CH3)2CHCH2CH(NH2)-or(NH2)(COOH) CHCH2CH2-, R, represents hydrogen, alkyl or substituted alkyl, R2 represents alkylene or hydroxyalkylene, R3 and R4 are the same or different and represents hydrogen, halogeno, nitro, hydroxyl, sulfo, carboxyl, alkyl, and alkoxy, and salts thereof into the compound represented by the general formula (II):
wherein R,, R2, R3 and R4 have the same meanings as defined above [hereinafter referred to as compound (II)] by the action of LAP or y-GTP, (a) reacting the compound (II) with a chromogen to form a pigment or (b) converting the compound (II)-into diazonium salt and reacting the diazonium salt with coupling agent to form azo dye, and measuring the absorption of the colored reaction solution.
本发明提供了一种测定样品中亮氨酸-氨基肽酶(以下简称 LAP)活性或 Y-谷氨酰转肽酶(以下简称 γ-GTP)活性的方法,该方法包括将通式 (I) 所代表的待测定酶的底物转化:
其中 Z 代表(CH3)2CHCH2CH(NH2)-或(NH2)(COOH) CHCH2CH2-,R 代表氢、烷基或取代的烷基,R2 代表亚烷基或羟基亚烷基,R3 和 R4 相同或不同并代表氢、卤素、硝基、羟基、磺基、羧基、烷基和烷氧基,以及它们的盐:
其中 R、R2、R3 和 R4 的含义与上述定义相同[以下简称化合物(II)],在 LAP 或 y-GTP 的作用下,(a) 使化合物(II)与发色剂反应生成色素,或 (b) 将化合物(II)转化为重氮盐,并使重氮盐与偶联剂反应生成偶氮染料,然后测量有色反应溶液的吸收率。