A composition for determining the presence of leukocytes, esterase or protease in a test sample. The composition comprises an ester having the structure ##STR1## 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.
一种用于检测测试样品中是否存在白细胞、
酯酶或
蛋白酶的组合物。该组合物包括具有结构##STR1##的酯,其中:A是N-保护
氨基酸残基或N-保护肽残基,X是O、S或NR',R是芳基或低碳基,R*是H或低碳基,R'是H、低碳基或芳基;以及适当的缓冲物质。