6- O -α- D -glucopyransyl- D -glucose. C 12 H 22 O 11 (342.30). Also called brachiose. A reducing disaccharide consisting of two molecules of D -glucose linked together in an α-(1→6) bond. It is a structural unit of amylopectin, glycogen, and dextran in bacterial cell walls, and is generally obtained by partial hydrolysis of these. It is the second most abundant sugar in sake after glucose. It is obtained in 50% yield from the enzymatic hydrolysis solution of dextran from the lactic acid bacterium Leuconstoc mesenteroides using an activated charcoal column. It is a hygroscopic solid. Melting point 120 °C. +120° (water). It is not fermented by yeast, and is not decomposed by maltase or amylase. [CAS 499-40-1] Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition |
6-O-α-D-glucopyransyl-D-glucose.C12H22O11(342.30).ブラキオースともいう.2分子のD-グルコースがα-(1→6)-結合した還元性二糖.アミロペクチン,グリコーゲン,バクテリア細胞壁のデキストランなどの構成単位になっており,一般にそれらの部分加水分解によって得られる.清酒中にはグルコースについで多く存在する.乳酸菌Leuconstoc mesenteroidesのデキストランの酵素分解液から活性炭カラムを使って50% の収率で得られている.吸湿性の固体.融点120 ℃.+120°(水).酵母によって発酵されず,マルターゼやアミラーゼなどで分解されない.[CAS 499-40-1] 出典 森北出版「化学辞典(第2版)」化学辞典 第2版について 情報 |
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