(广东省农业科学院 蚕业与农产品加工研究所/农业农村部功能食品重点实验室/ 广东省农产品加工重点实验室, 广东 广州 510610)
(Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture and Rural Affairs/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China)
Lychee, as a typical fruit of South China, was popular in domestic and oversea markets for its delicious tastes and health promoting effects. In recent years, a lot of studies have focused on the bioactive components and health effects of lychee. This paper summarized the chemical structures and distribution characteristics of polyphenols and polysaccharides in lychee pulp. Procyanidines and flavonoids were the main polyphenols in lychee pulp while heteropolysaccharides were the main polysaccharides, which possessed a large number of fractions with different molecular weights and structures. Lychee pulp with different cultivars had different polyphenols and polysaccharides contents while feizixiao and nuomici were the best cultivars. The antioxidant, hepatic protection, lipid metabolism improvement, and immunomodulatory activities and their action mechanisms of polyphenols and polysaccharides were summarized. Moreover, changes of polyphenols and polysaccharides during the process of lychee were introduced. This review will provide inferences for the lychee's intensive process.