Optimization of extraction technique and physicochemical property of pectin from persimmon

In order to exploitation deep processing products of persimmon,the extraction technical parameters of persimmon pectin were optimized by response surface methodology based on Box-Behnken design with acid extraction and ethanol precipitation method of astringent persimmon in this paper,the physicochemical property of pectin was investigated. The results indicated that the optimum extraction conditions as follows:pH4.00,solvent-to-solid ratiowas 23:1 (g/g),extraction time was 107 min and extraction temperature was 92 ℃,the yield of pectin was 7.31%. Under these conditions,lightness was 30.74,colour saturation was 13.04,colour hue was 44.07 in extracted persimmon pectin,degree of esterification and molecular mass were 98.88% and 405.3 kDa. Their monosaccharide contents in pectin constituents were fucose,galactose,Arabia sugar,glucose,fructose,xylose and galacturonic acid. The research results may provide a theoretical basis and technical support for the extraction and using of pectin from persimmon.