Research on the New Technique of Solid-state Synthesis of the Phosphoric Starch Ester by the Method of Microwave Heating

Wang Qingcheng, Bai Jinwei, Ma Hongbin
(Material College, Southwest University of Science & Technology, Sichuan Mianyang 621002)

Abstract The starch phosphate ester was prepared through the solid phase reaction of the maize starch with the sodium pyrophosphate and the disodium hydrogen phosphate by the aid of the microwave irradiation. How do the quality of the phosphates and catalyst and reaction's time effect the substitution degree is investigated. The substitution degree of the product is determined by spectrophotometer method of NH₄VO₃. The best technological condition is: the mass ratio of sodium pyrophosphate and the disodium hydrogen phosphate and starches and catalyst is 4:6:10:1; heat time is 3min; the substitution degree is 0.15.
Key words Starch phosphate ester, Solid phase method by microwave heating, Substitution degree

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