Patent ID: 8765416

Claim:
A process for producing a particulate composition comprising anhydrous crystalline 2-O-α-D-glucosyl-L- ascorbic acid; wherein said particulate composition comprises 2-O-α-D-glucosyl-L- ascorbic acid in an amount of over 98.0% by weight but less than 99.9% by weight, on a dry solid basis; and has a degree of crystallinity of 90% or higher 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 particulate composition, said process comprising the steps of: (a) allowing cyclomaltodextrin glucanotransferase and glucoamylase in this order to act on a solution comprising amylaceous substance and L-ascorbic acid to obtain a solution comprising 2-O-α-D-glucosyl-L-ascorbic acid in a production yield of 35% by weight or higher of 2-O-α-D-glucosyl-L-ascorbic acid; (b) purifying the resulting solution to increase the content of 2-O-α-D-glucosyl-L-ascorbic acid to a level of over 86% by weight, on a dry solid basis; (c) crystallizing anhydrous crystalline 2-O-α-D- glucosyl-L-ascorbic acid from the resulting purified solution; (d) collecting the resulting precipitated anhydrous crystalline 2-O-α-D-glucosyl-L-ascorbic acid without any re-crystallizing step; and (e) ageing and drying the collected anhydrous crystalline 2-O-α-D-glucosyl-L-ascorbic acid; and said cyclomaltodextrin glucanotransferase is from Geobacillus stearothermophilus Tc-62 or Tc-27, or a mutant cyclomaltodextrin glucanotransferase of Geobacillus stearothermophilus Tc-91, having an amino acid sequence that the 228th lysine residue in the amino acid sequence of SEQ ID NO:1 is replaced with glutamic acid residue.