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Study on the metabolism of Lactobacillus bifidus. III. Purification and some properties of beta -galactosidase from a strain of L. bifidus


, : Study on the metabolism of Lactobacillus bifidus. III. Purification and some properties of beta -galactosidase from a strain of L. bifidus. Journal of the Agricultural Chemical Society of Japan 45(5): 207-215

Purified beta -galactosidase from L. bifidus A-3 had optimum activity at pH 7.0 and 50 deg C in phosphate buffer, and was stable at pH 6-7 at 5 deg C; it was inactivated at pH <4 and >60 deg C. The enzyme was activated by Mn2+, Fe2+ and reagents containing a sulphydryl group, but inactivated by Cu2+, Hg2+ and EDTA; it hydrolysed lactose and lactulose.

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