A composition, method and test device for determining the presence of leukocytes, esterase or protease in a test sample are disclosed. The composition comprises an ester which is hydrolyzed in the presence of leukocyte, esterase or protease to form a reaction product which couples with a diazonium salt to produce a detectable color change. The composition further comprises the salt of an alkaline earth metal which stabilizes the composition during manufacture and prevents the occurrence of false or background color change due to reactivity of the diazonium salt in the absence of leukocyte, esterase or protease.
本发明公开了一种用于确定测试样品中是否存在白细胞、
酯酶或
蛋白酶的组合物、方法和测试装置。该组合物包含一种酯,它在白细胞、
酯酶或
蛋白酶的存在下
水解形成反应产物,该反应产物与重氮盐偶联产生可检测的颜色变化。该组合物还包括碱土
金属盐,可在生产过程中稳定组合物,并防止在没有白细胞、
酯酶或
蛋白酶的情况下,由于重氮盐的反应性而发生错误的或背景的颜色变化。