ENZYMATIC METHOD FOR PREPARING 4-O-BETA-D-GALACTOPYRANOSYL-D-XYLOSE Russian patent published in 2008 - IPC C12P19/12 C07H3/04 

FIELD: biotechnology, biochemistry, enzymes.

SUBSTANCE: invention relates to a method for preparing 4-O-β-D-galactopyranosyl-D-xylose used for in vivo assay of lactase activity in human intestine. Method involves interaction of D-xylose with β-D-galactopyranoside for 2-48 h in a solution at pH 5-9, at temperature that changes from the mixture freezing point to 45^°C, and the following addition of 10-1000 U of β-D-galactosidase per 1 g of β-D-galactopyranoside. Reaction is terminated by inactivation of enzyme followed by isolation and crystallization of fraction containing 4-O-β-D-galactopyranosyl-D-xylose in the crystallization mixture chosen from acetone/methanol = (5-1):(20-1) and acetone/water = (5-1):(20-1). Invention provides increasing content of 4-O-β-D-galactopyranosyl-D-xylose in the final mixture.

EFFECT: improved preparing method.

42 cl, 2 tbl, 9 ex