Patent ID: 7932050

Claim:
A reaction medium comprising at least one chromogenic peptidase substrate according to formula (I) below, alone or in combination with at least one other enzymatic substrate specific for an enzymatic activity other than that detected by said peptidase substrate: wherein: R1 represents a hydrogen atom, a C1-C12 alkyl group, a C6-C14 aralkyl group, an aryl group, —COOH, —COOR′ or —NR″R′″, R2 represents a hydrogen atom, a halogen atom, a C1-C12 alkyl group, —COOH or —COOR′, R3 represents a hydrogen atom, a halogen atom, a C1-C12 alkyl group, —CN, —CONH2, —COOR′ or —COR′, R4, R5 and R6 each independently represent a hydrogen atom, a halogen atom, —COOR′ or a C1-C3 alkyl group, at least one of R4, R5 and R6 is a hydrogen atom, R′ represents a hydrogen atom or a C1-C6 alkyl group, R″ and R′″ each independently represent a C1-C6 alkyl group, or R″ and R′″, together with the nitrogen atom to which they are attached, form a heterocyclic ring containing one or more heteroatoms, A represents at least one amino acid residue, and X represents a blocking moiety or is not present.