| 摘要 |
It is intended to provide a glucan useful as a water-soluble dietary fiber, a method for producing the same, and use thereof. The object is achieved by providing a branched α-glucan, which is an α-glucan including glucose as a constituent sugar and is characterized by having the following features based on a methylation analysis: (1) a ratio of 2,3,6-trimethyl-1,4,5-triacetylglucitol to 2,3,4-trimethyl-1,5,6-triacetylglucitol is in the range from 1:0.6 to 1:4; (2) the total amount of 2,3,6-trimethyl-1,4,5-triacetylglucitol and 2,3,4-trimethyl-1,5,6-triacetylglucitol is 60% or more of partially methylated glucitol acetate; (3) the amount of 2,4,6-trimethyl-1,3,5-triacetylglucitol is 0.5% or more and less than 10% of partially methylated glucitol acetate; and (4) the amount of 2,4-dimethyl-1,3,5,6-tetraacetylglucitol is 0.5% or more of partially methylated glucitol acetate, a novel α-glucosyltransferase producing the branched α-glucan, a method for producing the same and use thereof. |
