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Comparison of physicochemical characteristics and biological activities of polysaccharides from Lycium barbarum L. at different tree ages

Ningli Wang, Han Wang, Hao Meng, Xinyu Guo, Dong Pei, Yingli Yang, Jianfei Liu, Duolong Di

Research Square (Research Square)(2022)

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Abstract
AbstractThe biological activity is related to the content of active substances, and the accumulation of active substances is closely related to the tree age. The relationship between the physicochemical characteristics and biological activities ofLycium barbarumpolysaccharides (LBPs) and tree ages was studied in this study. The physicochemical characteristics of LBPs at second (Y2), fourth (Y4), sixth (Y6), eighth (Y8), tenth (Y10) and fifteenth (Y15) tree ages, such as total carbohydrate content (TCC), protein content (PC), uronic acid content (UAC), monosaccharide composition, molecular weight distribution, infrared characteristics were determined. And effects of LBPs of different tree ages on PC12 cells and APRE-19 cells function were evaluated in vitro. The results indicated that there was no significant difference in PC of LBPs at different tree ages. The UAC and TCC of LBPs from Y4 to Y10 were not significantly different, but were significantly higher than those in Y2 and Y15. LBPs of different tree ages showed similar preliminary structural characteristics. Compared with the LBPs of other tree ages, the LBPs of Y4, Y6, Y8 and Y10 had a good role in resisting oxidative stress. These results indicated that molecular weight, TCC and UAC of LBPs had important effects on their antioxidant activity in vitro. The accumulation of UAC and TCC in LBPs was closely related to tree age. The physicochemical characteristics and biological activities of LBPs fromY4 to Y10 were better than Y2 and Y15. Therefore,Lycium barbarumL. from Y4 to Y10 should be selected when preparing LBPs.
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Key words
polysaccharides,tree,physicochemical characteristics,biological activities
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