AST 试剂中 NADH 含量变化对线性范围影响的研究

摘要

Objective To estimate the assay performance of two different kind of reagent with different concentration of NADH.Methods Verificated function index of these two reagents,such as accuracy,sensitiveness,blank space and so on, and determined the molar extinction coefficient of NADH using hexokinase method and calculated the NADH density in two kind of AST reagents.Then estimated the effect of concentation of NADH on the analysis performance.Results NADH concentration was 0.21 mmol/L,and the sample detection limit of the linear was 1 629 U/L.NADH concentration was 0.13 mmol/L,and the sample detection limit of the linear was 1 263 U/L.So the gap between the two reagent’s detection linear was visible.But there were no significant changes in other performance indicators such as detection sensitivity,reagent blank,precision.Conclusion The NADH concentration in the reagent of AST had greatimpact on the detecting linear range, so should pay attention to the potential change of linear range in the daily work.%目的：评估天门冬氨酸氨基转移酶（AST）试剂中还原型辅酶（NADH）含量变化对试剂盒线性范围的影响。方法对两个具有不同 NADH 含量的同一品牌 AST 试剂的线性范围、精密度、灵敏度、试剂空白等性能指标分别进行验证，利用己糖激酶法测定葡萄糖浓度的方法测定 NADH 的摩尔消光系数，进而评估 NADH 浓度变化对分析性能的影响。结果较高及较低 NADH 浓度 AST 试剂的 R1试剂中 NADH 浓度分别为0.21 mmol／L（基础吸光度为1.1876）和0.13 mmol／L（基础吸光度为0.7567），NADH 浓度降低可造成试剂盒的线性范围减小，检测上限由1629 U／L 降至1263 U／L。NADH 浓度变化对两种试剂的精密度、灵敏度、试剂空白等性能指标无明显影响。结论AST 试剂盒的 R1试剂中NADH 浓度降低（基础吸光度减小）可造成样品检测线性范围减小，因此实验室通过合适的线性评估方案定义其 AST 试剂能够满足线性范围的基础吸光度标准，对于判断试剂质量、保证高值结果准确是很重要的。