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Abstract

It is interesting to speculate on the unique position occupied by D-glucose in the life processes of both animals and plants. We cannot yet begin to understand why the constitution and configuration of this sugar should fit it to play the predominating role it does. The facts remain that glucose is the only sugar found in the blood of animals and that enzymic mechanisms exist in animal tissues for the conversion of almost every other monosaccharide into glucose. In the plant the story is similar, but here glucose is associated with the closely related ketose, D-fructose and the disaccharide, sucrose. It would appear that glucose and fructose are interchangeable in many of the sequences of plant metabolism. Indeed, interconversion of glucose and fructose in plants is an established fact and the enzyme system responsible has been closely studied. In the majority of plants the energy derived from photosynthesis is stored as carbohydrate and the most abundantly distributed representative of this class of reserve carbohydrate is starch, a polyglucose. Polymerised fructose (fructosans) is by no means an unusual mode of storage and in some plants, e. g. sugar cane or beet, the favoured form of storage is sucrose.

Keywords

Sweet Potato Enzymic Synthesis Potato Starch Glucose Unit Waxy Maize 
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© Wien · Springer - Verlag 1954

Authors and Affiliations

  • Stanley Peat
    • 1
  1. 1.BangorUK

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