This invention has as its object a method for detecting catalytic activity
of a sample, characterized in that it comprises: the incubation of a
substrate (S) with the sample that may have the catalytic activity that
it is desired to detect, the addition of a reagent (X) that can react
either with a chemical group of unconsumed substrate (S) or with a
chemical group of product (P) that is formed after an incubation period
with the sample, the addition of a developer (R) that can react with
reagent (X), and the detection of the transformation of developer (R).