A dry reagent composition that includes an active redox enzyme that oxidizes an analyte as a specific substrate to produce an inactive reduced form of the enzyme; and a salt of ferricyanide provides improved performance in electrochemical test strips such as those used for detection of glucose. The salt of ferricyanide consists of ferricyanide and positively-charged counter ions, and the positively charged counter ions are selected such that the salt of ferricyanide is soluble in water, and such that the salt of ferricyanide or the crystalline phase of the salt of ferricyanide has a solubility in water and/or a lower E
0
eff
at a concentration of 100 mM than potassium ferricyanide. For example, the salt of ferricyanide may be tetramethylammonium ferricyanide.
一种干燥试剂组合物,包括一种活性氧化酶,将分析物氧化为特定底物,产生一种不活性的酶还原形式;以及一种
铁氰化盐盐提供了更好的电
化学试纸的性能,例如用于
葡萄糖检测。
铁氰化盐的盐由
铁氰化物和带正电的反离子组成,正电反离子的选择使得
铁氰化盐在
水中可溶,并且
铁氰化盐或
铁氰化盐的晶体相在100 mM浓度下的
水溶性和/或E0eff较低。例如,
铁氰化盐可以是
四甲基铵铁氰化物。