There is disclosed a multi-layer analytical element for measuring alkaline phosphatase in a liquid sample, which comprises a substrate for measuring activity of alkaline phosphatase and a buffering agent having a pKa value of about 8 or higher contained in layers separate from each other, characterized in that the substrate is a phosphoric acid ester of a non-self-developable compound or its salt, and the non-self-developable compound formed by the action of alkaline phosphatase is a compound capable of forming a dye through condensation of two molecules in the presence of an oxidizing agent.
本发明公开了一种用于测量液体样品中碱性
磷酸酶的多层分析元件,该元件由测量碱性
磷酸酶活性的底物和 pKa 值约为 8 或更高的缓冲剂组成,这两种物质被分装在彼此独立的层中,其特征在于底物是一种非自显性化合物的
磷酸酯或其盐,而在碱性
磷酸酶作用下形成的非自显性化合物是一种能够在氧化剂存在下通过两个分子缩合形成
染料的化合物。