six glycoside hydrolases in the culture medium of bacteroides fragilis -- alpha-glucosidase , beta-glucosidase , alpha-galactosidase , beta-galactosidase , beta-n-acetylglucosaminidase , and alpha-l-fucosidase-were systematically purified by ammonium sulfate precipitation , gel filtration chromatography , and density gradient isoelectric focusing .
C0017976
glycoside hydrolases
C0016787
alpha-l-fucosidase