Zhejiang University

Jiaqi Zheng

Hua Zhang

Donghong Liu

Xingqian Ye

Shiguo Chen

The present disclosure discloses a method for extracting a RG-I-rich pectic polysaccharide. The method comprises the following steps: mixing and stirring a citrus fruit peel powder and a dilute hydrochloric acid solution at a low temperature to destroy cell walls of citrus peels, filtering, and then mixing the retentate with a sodium hydroxide solution for low temperature extraction, adding ethanol to the solution obtained by filtering to precipitate, and washing the obtained polysaccharide with ethanol and drying to obtain the above pectic polysaccharide. Compared with the traditional extraction method, this method reduces the hydrolysis of pectin side chains by controlling the extraction temperature, and the extracted pectic polysaccharide is rich in RG-I domain and has higher biological activity such as cancer and cardiovascular disease prevention. Energy can be greatly saved because of the low extraction temperature. The extracted pectic polysaccharide can be potentially used as functional food ingredients.

Method for extracting RG-I-rich pectin

The present disclosure discloses a method for preparing a citrus-derived complex prebiotic agent. The method comprises the following steps: removing external citrus peels after blanching citrus fruits with hot water, soaking citrus segments after splitting with an acid solution and an alkali solution to remove membranes of the citrus segments, and adjusting the pH of the obtained alkali soaking water with acid soaking water or acid to be weakly acidic or neutral to obtain the complex prebiotic agent, which has the function of reversing intestinal flora disorders. Compared with the traditional prebiotic product preparing method, the product prepared by the method contains prebiotic functional components with different targets such as pectin, flavonoids, oligosaccharides, and other fibers at the same time, and has the efficacies of regulating intestinal flora and reversing intestinal flora disorders caused by antibiotics. At the same time, the preparing method has the characteristics of simple operation and low cost, perfectly supplements a comprehensive utilization process of citrus fruit processing, solves the discharge problem of citrus fruit processing water, and generates very good social benefits.

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Hangzhou, China

Jiaqi Zheng