| abstract |
A composition for determining the presence of leukocytes, esterase or protease in a test sample. The composition comprises an ester having the structuren in which: A is an N-blocked-amino acid residue or an N-blocked-peptide residue, X is O, S or NR', R is aryl, or lower alkyl, R * is H, or lower alkyl, and R' is H, lower alkyl or aryl; and a suitable buffer substance. |