Study on Extraction Process of Pectin from Pomace of Zhaotong Apple
[Objective]In order to make full use of Zhaotong apple resources,the optimum hydrochloric acid extraction conditions of apple pectin were studied to provide reference for extending Zhaotong apple industry chain and increasing its added value.[Methods]The effects of single factor on the yield of pectin were analyzed by hydrochloric acid extraction-anhydrous ethanol precipitation method with the pomace of five apple cultivars in Zhaotong area as raw material.At the same time,the response surface was used to optimize the pectin extraction process,and then the pectin in the apple pomace of different apple varieties in five Zhaotong areas was extracted by software analysis.[Results]The effects of four single factors on the yield of pectin extracted from Zhaotong apple were as follows:extraction time<extraction temperature<extraction pH<ratio of mate-rial to liquid.The optimum conditions of hydrochloric acid extraction of pectin from apple pomace were as follows:ratio of ma-terial to liquid 1∶50(g/ml),pH 1.0,temperature 94℃and extraction time 70 min.The yield of pectin extracted by hydro-chloric acid from different apple varieties was in the order of Changfu 2>Qinguan>Yanfu 7>Yanfu 8>Yanfu 3.[Conclusion]The method of extracting apple pectin by hydrochloric acid extraction followed by alcohol precipitation with anhydrous ethanol has a rel-atively low cost and is suitable for industrial production.The pectin yields obtained from different apple cultivars vary,which can pro-vide certain reference for the selection of apple cultivars when extracting pectin from the pomace of Zhaotong apples.
apple pomacepectinhydrochloric acid extractionresponse surface analysis
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