Description
α-Glucosidase (EC 3.2.1.20, maltase, glucoinvertase, glucosidosucrase, maltase-glucoamylase, α-glucopyranosidase, glucosidoinvertase, α-D-glucosidase, α-glucoside hydrolase, α-1,4-glucosidase, α-D-glucoside glucohydrolase; systematic name α-D-glucoside glucohydrolase) is a glucosidase located in the brush border of the small intestine that acts upon α(1→4) bonds.
Unit Definition
One Unit of α-D-glucosidase activity is defined as the amount of enzyme required to release one µmole of p-nitrophenol per minute from 4-nitrophenyl α-D-glucopyranoside (5 mM), in sodium phosphate buffer (100 mM), pH 6.5 at 40°C.
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