Abstract:Analysis of pectin extraction process by single factor and orthogonal experimental design，according to the principle of Box－Behnken，the ratio of solid to solvent，extraction temperature，extraction time，pH values of the four factors on the acid extraction and ethanol were optimized orthogonal design and response surface precipitation process，finally the physicochemical properties were analyzed on pectin.The results show that the orthogonal design and response surface analysis of two methods，two methods in the analysis of various factors in the orange peel pectin extraction rate influence on the results are consistent，namely the material liquid ratio＞pH＞extraction temperature extraction time＞，the optimum orthogonal test was determined as follow：solid－liquid ratio 20∶1（mL/g），extraction time，pH0.8，100 min the temperature of 80℃；the optimum surface test to determine the response：the solid－liquid ratio is 21 ∶1，extraction pH0.7，extraction time 102 min，extraction temperature of 81℃.The optimum condition is determined by the two test，results show that the optimum extraction conditions according to response surface analysis of the income rate is higher than the 5.42%orthogonal test.Therefore，the best extraction technology of pectin from orange peel by response surface method as the standard，the extraction yield of pectin from navel orange pell was 23.52%.The extraction of pectin，the physical and chemical indicators meet the national standard requirements，this paper provides a method for extracting low，high efficiency，simple process for the production of orange peel pectin.