…Since α-amylase does not act on α-1,6 glucosidic bonds, in the case of amylopectin, a few percent of isomaltose, in which two glucose molecules are linked by α-1,6 glucosidic bonds, is produced. The optimal pH for salivary gland amylase is 6 to 7, and digestion continues while the mixture of food and saliva remains in the upper part of the stomach (this is called intragastric digestion), but its activity is lost when it is mixed with gastric acid. When food is sent from the stomach to the duodenum, digestion continues again due to α-amylase (amylopsin) secreted from the pancreas. … *Some of the terminology that refers to "gastric digestion" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…α‐アミラーゼはα‐1,6グルコシド結合には作用しないため,アミロペクチンの場合はグルコースがα‐1,6グルコシド結合で2分子結合したイソマルトースが数%産生される。唾液腺アミラーゼの至適pHは6~7であり,胃の上部に食物と唾液の混和したものが停留している間,消化は進行する(これを胃内消化という)が,胃酸と混和するとその活性は失われる。食物が胃から十二指腸に送られると,膵臓から分泌されるα‐アミラーゼ(アミロプシン)により再び消化は進行する。… ※「胃内消化」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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