title: Aflatoxin B1 effect on beta-D-galactosidase in some starter cultures.
abstract: Six starter cultures were examined for their ability to induce beta-D-Galactosidase activity. The maximum (713 x 10(-4) units/ml) and minimum (140 x 10(-4) units/ml) enzyme activity was shown by Lactobacillus bulgaricus and Streptomyces thermophilus, respectively. The maximum inhibition by aflatoxin B1 of induction and activity of enzyme in vitro was observed at 60 micrograms/ml in all cultures. However, low levels of the toxin stimulated induction of the enzyme in Streptococcus lactis and S. thermophilus.
mesh_terms: D000348:Aflatoxins / Q000494:pharmacology*; D046508:Culture Techniques; D003864:Depression, Chemical; D004790:Enzyme Induction / Q000187:drug effects; D004791:Enzyme Inhibitors; D005696:Galactosidases / Q000096:biosynthesis*; D007778:Lactobacillus / Q000201:enzymology*; D013302:Streptomyces / Q000201:enzymology*; D001616:beta-Galactosidase / Q000096:biosynthesis*
chemical_list: D000348:Aflatoxins; D004791:Enzyme Inhibitors; D005696:Galactosidases; D001616:beta-Galactosidase