Physicochemical properties and antioxidant activity of polysaccharides from Chinese yam (Dioscorea opposita Thunb.)

JSFA reports Pub Date : 2023-02-06 DOI:10.1002/jsf2.105

Ruize Jiao, Yingyin Wu, Fangcheng Xu, Yan Li, Linchun Mao

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Abstract

Background

Nuoshanyao (NSY) is a special species of Chinese yam (Dioscorea opposita Thunb.) and shows rich functionality and superior nutritional value. The chemical components and structural properties of Nuoshanyao polysaccharide (NSYP) were investigated in his study.

Results

The molecular weight (Mw) of the major component in the polysaccharide was 23 kDa. NSYP was mainly composed of glucose, mannose, and galactose, and the molar ratio was 36.5:1.63:1. There might be an ordered helical conformation in NSYP, and the surface of NSYP was granular. NSYP exhibited strong scavenging capacity on the DPPH radical and chelating capacity on the ferrous ion in vitro with a rate of 94.94% and 82.49% at 4 mg/mL.

Conclusion

NSYP with the appropriate molecular weight range and helix structure could possess great antioxidant activity, while monosaccharide compositions may affect the activity. This work supplied important information for the potential application of NSYP in the nutritional and food industries.

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山药多糖的理化性质及抗氧化活性研究

糯山药(NSY)是山药(Dioscorea opposita Thunb.)的一种特殊品种，具有丰富的功能性和优越的营养价值。对糯山药多糖的化学成分和结构性质进行了研究。结果多糖中主要成分分子量为23 kDa。NSYP主要由葡萄糖、甘露糖和半乳糖组成，摩尔比为36.5:1.63:1。NSYP可能存在有序的螺旋构象，NSYP表面呈颗粒状。NSYP对DPPH自由基具有较强的清除能力，对亚铁离子具有较强的螯合能力，在4 mg/mL浓度下，其螯合率分别为94.94%和82.49%。结论适当分子量范围和螺旋结构的NSYP具有较强的抗氧化活性，而单糖成分可能影响其抗氧化活性。这项工作为NSYP在营养和食品工业中的潜在应用提供了重要的信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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JSFA reports

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