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《Journal of Baoji University of Arts and Sciences(Natural Science Edition)》 2009-01
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Preparation for cassava starch acetate with low degree of substitution by acetic anhydride

LIN Wu-tao,XIE Zhao-long(Department of Chemistry and Biological Engineering,Sanming College,Sanming 365004,Fujian,China)  
Aim To prepare lower degree of substituted starch acetate with cassava starch as material,acetic anhydride as acetylation reagent,sodium hydroxide as catalyst and sodium sulfate as gelatinization inhibiter.Methods The effects of reaction factors such as reaction temperature,reaction time and the concentration of cassava starch on acetyl content of cassava acetate starch were studied.Results The optimum conditions for lower substituted synthetic acetate starch,which was obtained by uniform experimental design,were as follows:reaction temperature was 21 ℃;reaction time was 120 min;pH=8.0~8.4;the amount of sodium sulfate was 2%;the concentration of cassava starch was 45% and the amount of acetic anhydride was 6%(calculated by the dry weight of starch).Under the conditions,the content of acetyl in the products was 1.68%,and the degree of substitution(DS)was 0.064 3.Conclusion The physicochemical properties of products such as retro-gradation,transparence and viscosity were improved under proper reaction conditions.
【CateGory Index】: TS236.9
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