グリコーゲン

グリコーゲン 価格

グリコーゲン 化学特性,用途語,生産方法

• 外観

  溶液

• 定義

  本品は、ムラサキガイ Mytilus edulis Linne の貝肉より得られるグリコーゲンである。

• 溶解性

  水に可溶

• 解説

  グリコーゲン，白色の無定形粉末．[α]D＋191～199°．水に可溶．ヨード反応は紫赤色から紫褐色．β-アミラーゼで45％ が加水分解して，マルトースを生成し，あとは限界デキストリンになる．

  森北出版「化学辞典（第2版）

• 化粧品の成分用途

  皮膚コンディショニング剤

• 化学的特性

  White to off-white powder

• 使用

  glycogen is a skin-conditioning agent. It is a high molecular-weight polymer distributed through the cell protoplasm.

• 定義

  A polysaccharide that is the main carbohydrate store of animals. It is composed of many glucose units linked in a similar way to starch. Glycogen is readily hydrolyzed in a stepwise manner to glucose itself. It is stored largely in the liver and in muscle but is found widely distributed in the body.

• 一般的な説明

  Glycogen is a branched polymer of glucose synthesized by animal cells for energy storage and release. It is constructed of predominantly α1→4 glycosidic bonds with branches created through α1→6 glycosidic bonds.

• 合成

  Glycogen synthesis occurs in the cytoplasm and can be divided into the following four steps:
  (1) Glycogenesis begins with the phosphorylation of glucose by glucokinase in the liver and by hexokinase in muscle and other tissues.
  (2) Glucose-6-phosphate is then converted into glucose-1-phosphate by phosphoglucomutase, a reaction similar to that catalysed by phosphoglycerol mutase.
  (3) Glucose-1-phosphate is converted into uridine diphosphate (UTP)-glucose, the immediate precursor of glycogen synthesis, by reaction with uridine triphosphate (UTP). This reaction is catalysed by glucose 1-phosphate uridylyltransferase (or UDP-glucose pyrophosphorylase).
  (4) Finally, the glucosyl residue at the C-1 position of UDP-glucose is added to the tyrosyl group at position 194 of glycogen protease in an Mg2+-dependent autocatalytic reaction. Glycosidases similarly extend the glucan chain by α(1→4) glycosidic bonds by adding 6 to 7 glucosyl units, using UDP-glucose as the substrate, in an autocatalytic reaction. The glucan primer of glycogen proteins is elongated by glycogen synthase using UDP glucose. Initially, the glycogenin primer and glycogen synthase are strongly bound using a 1:1 complex. As the dextran chain grows, glycogen synthase separates from glycogen.
  

• 概要

  動物の貯蔵多糖として広く分布．トウモロコシの種子，菌類や酵母，細菌類などにもグリコーゲン様多糖が存在．平均α1→4結合グルコース残基12～18個あたり1個でα1→6結合した枝分かれをもつ

• 純化方法

  A 5% aqueous solution (charcoal) of D(+)-glycogen is filtered, and an equal volume of EtOH is added. After standing overnight at 3o the precipitate is collected by centrifugation, washed with absolute EtOH, then EtOH/diethyl ether (1:1) and diethyl ether, and dried. [Sutherland & Wosilait J Biol Chem 218 459 1956.]

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