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International Journal of Biological Macromolecules 2019-Aug

Physicochemical characteristics and biological activities of polysaccharides from the leaves of different loquat (Eriobotrya japonica) cultivars.

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Yuan Fu
Qin Yuan
Shang Lin
Wen Liu
Gang Du
Li Zhao
Qing Zhang
De-Rong Lin
Yun-Tao Liu
Wen Qin

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In order to explore polysaccharides from loquat leaves (LLPs) as functional food ingredients for prevention and treatment of obesity and type 2 diabetes, the physicochemical characteristics, in vitro binding properties, and inhibitory effects on α-amylase and α-glucosidase of polysaccharides from the leaves of different loquat cultivars, including 'Baiyu', 'Chuannong8', 'Yuanbao', and 'Dawuxing', were investigated and compared. Results showed that the contents of total uronic acids and degree of esterification in LLPs ranged from (27.04 ± 1.76)% to (41.46 ± 1.91)%, and from (20.54 ± 0.11)% to (26.90 ± 0.10)%, respectively. The weight-average molecular weights of LLPs ranged from 4.307 × 106 Da to 5.101 × 106 Da, and the major constituent monosaccharides of LLPs were rhamnose, galacturonic acid, arabinose, and galactose. Furthermore, LLPs exerted strong in vitro fat binding, cholesterol binding, and bile acid binding capacities, as well as remarkable inhibitory effects on α-amylase and α-glucosidase, which might be attributed to their molecular weights, molecular weight distributions, and degree of esterification. Results are helpful for better understanding of chemical structures and bioactivities of polysaccharides from loquat leaves, and LLPs had good potential to be explored as functional food ingredients for prevention and treatment of obesity and type 2 diabetes.

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