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Precipitation Methods of Pectin From Shaddock Peel

ZHOU Jin-hua~(1,2), ZHOU Chun-shan~1, XIE Lian-wu~1 (1. Institution of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, China; 2. School of Sciences, Central South Forestry University, Zhuzhou 412006, Hunan, China)  
Pectin was extracted from shaddock peel with hydrochloride acid solution and pectin extraction was obtained. By alcohol-precipitation and salting-out method, pectin was precipitated from the extraction. The optimal precipitation conditions of both precipitation methods were achieved. The alcohol consumption of both methods was compared and the influences of either method on pectin precipitation yield and pectin quality were also studied. The results are as follows: the alcohol consumption of alcohol-precipitation method almost doubles that of salting-out method; and the salting-out method is a better pectin precipitation method because it offers a sharp decrease of the alcohol consumption, a sparing of the extraction condensation process, a reduction of energy consumption, a fall of the production cost and a warranty of high pectin precipitation yield and high pectin quality.
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