A molecular probe with l-phenylalanine p-nitroanilide and l-lysin 4-methylcoumaryl-7-amide, in which these amino acid derivatives are connected through a succinic-acid spacer, was prepared. Trypsin and papain were detected by blue-fluorescence emission of generated 7-amino-4-methylcoumarin (AMC). α-Chymotrypsin and nattokinase were detected from both the blue-fluorescence emission of AMC and the UV absorbance of p-nitroaniline. In addition, different time courses of p-nitroaniline and AMC were observed between the reaction of P1 with α-chymotrypsin and that with nattokinase. In the case of nattokinase, both the fluorescence emission and UV absorbance slowly increased. In contrast, the increasing UV absorbance was saturated at the early stage of the reaction of the present probe with chymotrypsin, whereas the fluorescence emission continuously increased in the following stages.
一种含有l-苯丙氨酸对硝基苯胺和l-赖氨酸4-甲基香豆素-7-酰胺的分子探针被制备出来,其中这些氨基酸衍生物通过琥珀酸间隔连接。胰蛋白酶和木瓜蛋白酶通过生成的7-氨基-4-甲基香豆素(AMC)的蓝色荧光发射被检测到。α-胰蛋白酶和纳豆激酶通过AMC的蓝色荧光发射和对对硝基苯胺的紫外吸收被检测到。此外,在P1与α-胰蛋白酶和纳豆激酶反应之间观察到对硝基苯胺和AMC的不同时间进程。在纳豆激酶的情况下,荧光发射和紫外吸收都缓慢增加。相比之下,与α-胰蛋白酶反应的反应物与该探针的反应在早期阶段紫外吸收增加饱和,而随后阶段荧光发射持续增加。