①试剂二配制后室温条件下稳定性较差,建议配制和使用过程中始终保持冰上放置,若试剂变色则停止使用;建议测定过程中根据使用量取用试剂二置于冰上放置,剩余试剂应及时置于-20℃保存;
②试剂二和试剂四配制后有效期较短,为便于试验安排均附赠一瓶作为备用,每瓶均可完成至少25个样本的测定;
③准确在10 s和310 s处完成吸光值测定,以保证实验结果的准确性和重复性;
④若A2测定或∆A大于1.0,建议将粗酶液使用提取液适当稀释后再进行测定;若∆A小于0.02,建议制备更高浓度样本、增加上样量(粗酶液增加至100 μL,其它试剂量不变)或适当延长酶促反应时间(37℃反应时间延长至10-30 min)后再进行测定,计算时相应修改;
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