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Study on Extraction of Proanthocyanidins from Sweet Potato Skin

HUANG Qiong,CHEN Chan,PENG Hong (Fujian Vocational College of Agriculture,Fuzhou 350007,China)  
The technology of extraction of proanthocyanidins from sweet potato skin was studied.The effects of five factors such as the ethanol concentration,temperature of extraction,time of extraction,ratio of solid to liquid,pH-value and extraction times were investigated.Through orthogonal test,the following optimum conditions for extraction were obtained on the basis of single factor test: 70% ethanol as solvent,ratio of solid to liquid 1∶10,pH6.0,80℃ for 2.0h and 2 times extraction.The extraction percentage of proanthocyanidins from sweet potato skin was 1.3960% under the optimum conditions.
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