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Polysaccharides and preparation thereof

  • US 5,756,318 A
  • Filed: 09/29/1995
  • Issued: 05/26/1998
  • Est. Priority Date: 03/24/1995
  • Status: Expired due to Term
First Claim
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1. A polysaccharide comprising (1→

  • 4) bonded α

    -D- glucose units represented by the following formula ##STR4## wherein R is a hydrogen atom or an acetyl group in a ratio of 7;

    3 of said polysaccharide having the following properties;

    (1) Nature;

    a white amorphous powder, without taste and odor;

    (2) Solubility;

    insoluble in alcohol, acetone, hexane, benzene, ethyl acetate, tetrachloromethane, chloroform and ether, and soluble in water, formamide, and dimethylsulfoxide;

    (3) pH of aqueous solution;

    neutral;

    (4) Component sugar;

    glucose only;

    (5) Molecular weight;

    500 to 10,000;

    (6) Specific optical rotation;



    )D (24°

    C.)=+112°

    to +116°

    ;

    (7) Color reaction;

    positive to anthrone-sulfuric acid reaction, phenol-sulfuric acid reaction, and chromotropic acid-sulfuric acid reaction, and negative to biuret reaction, Lowry-Folin reaction, Elson-Morgan reaction, and iodo reaction;

    (8) Melting point;

    showing no clear melting point;

    (9) IR spectrum;

    absorption specific to acetyl groups; and

    (10) 13 C-NMR spectrum;

    exhibiting signals characteristic to α

    -1,4-glucan and acetyl groups.

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