we examined the stability of n-acetyl-beta-d-glucosaminidase ( ec 3.2.1.30 ) , alanine aminopeptidase ( ec 3.4.11.2 ) , alkaline phosphatase ( ec 3.1.3.1 ) , gamma-glutamyltransferase ( ec 2.3.2.2 ) , and lysozyme ( ec 3.2.1.17 ) in urine prepared by gel filtration and supplemented with albumin , or ethylene glycol , or ethylene glycol plus albumin during storage at -20 degrees c for a period of 12 months .
C0002059
alkaline phosphatase
C0020289
ec