Process for producing a particulate composition comprising an hydrous crystalline 2-o-alpha-d-glucosyl-ascorbic acid
The invention provides a process for enabling the production of a particulate composition containing anhydrous crystalline ascorbic acid 2-glucoside that does not significantly cake even when the production yield of ascorbic acid 2-glucoside does not reach 35% by weight. The process for producing a particulate composition containing anhydrous crystalline ascorbic acid 2-glucoside, which comprises allowing a CGTase to act on a solution containing either liquefied starch or dextrin and L-ascorbic acid and then allowing a glucoamylase to act on the resulting solution to obtain a solution with an ascorbic acid 2-glucoside production yield of at least 27%, purifying the obtained solution to increase the ascorbic acid 2-glucoside content to a level of over 86% by weight, precipitating anhydrous crystalline ascorbic acid 2-glucoside by a controlled cooling method or pseudo-controlled cooling method, collecting the precipitated anhydrous crystalline ascorbic acid 2-glucoside, and ageing and drying the collected anhydrous crystalline ascorbic acid 2-glucoside.
1. A particulate composition comprising anhydrous crystalline 2-O-α-D-glucosyl-L-ascorbic acid,
which comprises 2-O-α-D-glucosyl-L-ascorbic acid in an amount of over 98.0% by weight but 99.8% by weight or lower, on a dry solid basis;
which has a degree of crystallinity of 90% or higher but 98% or lower for anhydrous crystalline 2-O-α-D-glucosyl-L-ascorbic acid, when calculated based on a profile of powder X-ray diffraction analysis of said composition;
and which has a reducing power of the whole particulate composition being less than one percent by weight.