title: alpha-Glucosidase and N-acetyl-beta-D-glucosaminidase isoenzymes in serum.
abstract: Using different conditions for incubation and fluorometry with 4-methylumbelliferylglycosides as substrates, we demonstrated the presence of acid alpha-glucosidase, "renal" alpha-glucosidase, N-acetyl-beta-D-glucosaminidase A, and N-acetyl-beta-D-glucosaminidase B in freshly drawn normal human serum. The acid alpha-glucosidase enzymatic activity was determined at pH 4.0 in 0.1 mol/L Tris reagent, whereas the renal isoenzyme activity was determined at pH 5.6 in presence of 0.05 mol/L turanose reagent. N-Acetyl-beta-D-glucosaminidases A and B were determined by their different behaviors on heating. The corresponding reference intervals for each enzyme were calculated from results for 40 controls: acid alpha-glucosidase (0.024 +/- 0.010 U/L), renal alpha-glucosidase (0.035 +/- 0.012 U/L), N-acetyl-beta-D-glucosaminidase A (10.2 +/- 2.9 U/L), and N-acetyl-beta-D-glucosaminidase B (4.4 +/- 2.1 U/L).
authors.affiliation: Laboratorio de Bioquimica, Hospital Virgen de la Salud, Toledo, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Coma
authors.forename: L
authors.initials: L
authors.lastname: Gomez-Chacon
authors.forename: B
authors.initials: B
authors.lastname: Garcia-Serrano
authors.forename: E
authors.initials: E
authors.lastname: Fernandez
authors.forename: M A
authors.initials: MA
authors.lastname: Ortiz-Apodaca
mesh_terms: D000118:Acetylglucosaminidase / Q000097:blood*; D000328:Adult; D004795:Enzyme Stability; D005260:Female; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007527:Isoenzymes / Q000097:blood*; D008297:Male; D012016:Reference Values; D000520:alpha-Glucosidases / Q000097:blood*
chemical_list: D007527:Isoenzymes; D000520:alpha-Glucosidases; D000118:Acetylglucosaminidase