A method of determining an analyte in a sample utilizing a redox reaction is provided, by which a highly reliable determined value can be obtained. In this method, a tetrazolium compound is added to a sample in the presence of a surfactant prior to a redox reaction so as to eliminate an effect of hemoglobin and a hemoglobin degradation product as reducing substances in the sample. Thereafter, a reducing or oxidizing substance derived from an analyte is produced and the amount thereof is determined by the redox reaction. Then, the amount of the analyte in the sample is determined based on the amount of the reducing or oxidizing substance thus determined. According to this method, cloudiness due to the coexistence with the hemoglobin can be prevented by the surfactant and thus an increase in the absorbance due to the cloudiness can be inhibited as shown in FIG. 1. As the surfactant, polyoxyethylene ether and the like can be used.
本发明提供了一种利用氧化还原反应测定样品中分析物的方法,通过这种方法可以获得高度可靠的测定值。在这种方法中,在氧化还原反应之前,在表面活性剂的存在下向样品中加入
四唑化合物,以消除样品中作为还原物质的血红蛋白和血红蛋白降解产物的影响。然后,产生一种由分析物衍生的还原性或氧化性物质,并通过氧化还原反应确定其含量。然后,根据由此确定的还原或氧化物质的量来确定样品中分析物的量。如图 1 所示,根据这种方法,表面活性剂可以防止由于与血红蛋白共存而导致的浑浊,从而抑制浑浊导致的吸光度增加。作为表面活性剂,可以使用聚氧
乙烯醚等。