An analytical element for quantitative analysis of analyte contained in a body fluid or the like, which has at least one reagent layer comprising a reactive reagent and a binder, characterized in that a portion or whole of the binder is a polycarboxylic acid carrying a nonionic surface active agent attached...http://www.google.de/patents/US4786595?utm_source=gb-gplus-sharePatent US4786595 - Analytical element for analysis of an analyte
