Method for manufacturing hydroxyethyl glycosaminoglycan film-forming agent for fresh-keeping of winter jujube

Method for manufacturing hydroxyethyl glycosaminoglycan film-forming agent for fresh-keeping of winter jujube

  • CN 1,543,818 A
  • Filed: 05/01/2004
  • Published: 11/10/2004
  • Est. Priority Date: 09/15/2003
  • Status: Active Application
First Claim
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1. , a kind of manufacture method of hydroxyethylamino polysaccharide fresh-keeping of dong jujube film forming agent is characterized in that comprising:

  • (one) is raw material with the ectoskeleton of shellfish or insect, carries out washing pH value neutrality with clear water after soda acid handles, and drying obtains chitosan;

    (2) add concentrated base in the chitosan and carry out deacetylation, the alkali consumption is 10-100 a times of chitosan, the concentration of alkali is 25%-60%, heating-up temperature is-5~

    25 ℃

    , or 80~

    120 ℃

    , the processing time is 2~

    8 hours, the washing drying obtains taking off the acetyl chitosan and also is glycosaminoglycan, the deacetylation of glycosaminoglycan can be 45%~

    55%, also can be 75%~

    100%;

    (3) glycosaminoglycan is the mixture of sized molecules amount shitosan through the glycosaminoglycan that acid hydrolysis, oxidative degradation, enzyme degraded or irradiation-induced degradation obtain, the molecular weight of its small-molecular weight shitosan is 2000Da~

    300,000 Da, the molecular weight of macromolecule shitosan is 40Da~

    2,000,000 Da, and the ratio of macromolecule glycosaminoglycan in mixture is 0~

    30%;

    (4) glycosaminoglycan is reacted with chlorethanol in solvent, obtain the ethoxy chitin derivative, the carboxylation degree of the product that reaction obtains is in 0.5~

    1.2 scope;

    (5) ethoxy chitin or hydroxyethylamino polysaccharide are dissolved in water, and the concentration of solution is 200ppm~

    2%;

    (6) in above-mentioned ethoxy chitin or hydroxyethylamino polysaccharide solution, add emulsifying agent, this emulsifying agent comprises Toween10~

    80, span20~

    60, sucrose fatty ester, monoglyceride, odium stearate, quaternary ammonium salt, the adding of emulsifying agent can be that single emulsifying agent also can be the mixture of two or more emulsifying agents, and the concentration of emulsifying agent can be 0.001-0.5%;

    (7) the pH value of adjusting in ethoxy chitin or the hydroxyethylamino polysaccharide solution with acid or alkali is 5~

    8, and the acid of use can be inorganic acid, also can be organic acid, and alkali can be NaOH, potassium hydroxide.

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