艾草多糖结构特征及抗氧化活性研究
Structural characterization and antioxidant activity of Artemisia argyi polysaccharids
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摘要: 【目的】解析艾草多糖的结构特征及抗氧化活性,促进艾草资源高值化利用及天然抗氧化功能因子开发。【方法】采用水提醇沉法提取艾草多糖,利用高效液相色谱和波谱分析艾草多糖组成和结构特征;通过DPPH、超氧阴离子、羟基和ABTS+自由基清除实验评价其体外抗氧化活性,并通过H2O2诱导的小鼠单核巨噬细胞系RAW264.7氧化损伤模型测定其氧化修复作用。【结果】艾草多糖由葡萄糖、半乳糖、阿拉伯糖、甘露糖、木糖和鼠李糖组成,物质的量比为1.00∶0.26∶0.23∶0.19∶0.15∶0.13,重均分子质量和多分散系数分别为25 934 Da和1.211;在0.31~5.00 mg/mL质量浓度范围内,艾草多糖对DPPH、超氧阴离子、羟基和ABTS+自由基的清除能力呈质量浓度依赖性,其中ABTS+自由基清除率最高达99.68%,与抗坏血酸(VC)相当;艾草多糖对RAW264.7细胞无明显毒性,且在H2O2诱导的氧化损伤模型中,使总超氧化物歧化酶(T-SOD)、过氧化氢酶(CAT)和谷胱甘肽过氧化物酶(GSH-Px)活力分别从0.17 U/mg prot、1.21 U/mg prot、4.90 U/mg prot提升至0.33 U/mg prot、1.58 U/mg prot、8.88 U/mg prot,丙二醛(MDA)水平从15.92 nmol/mL降低至8.89 nmol/mL,呈浓度依赖性。【结论】所得艾草多糖具有显著体外及细胞内抗氧化活性,可通过增强抗氧化酶活性、减轻脂质过氧化发挥修复作用,具备开发为天然抗氧化剂的潜力。Abstract: 【Objective】This study aimed to analyze the structural characteristics and antioxidant activity of Artemisia argyi polysaccharides, thereby facilitating the high-value utilization of Artemisia argyi resources and the development of natural antioxidant functional ingredients.【Methods】Artemisia argyi polysaccharides were extracted by water extraction and ethanol precipitation. High-performance liquid chromatography and spectroscopic analysis were used to analyze their composition and structural characteristics. The in vitro antioxidant activity was evaluated by DPPH, superoxide anion, hydroxyl, and ABTS+ radical scavenging assays. The cellular oxidative damage repair effect was assessed using an H2O2-induced oxidative damage model in the murine monocyte/macrophage cell line RAW264.7.【Results】The polysaccharides consisted of glucose, galactose, arabinose, mannose, xylose, and rhamnose at a molar ratio of 1.00∶0.26∶0.23∶0.19∶0.15∶0.13. Their weight-average molecular weight and polydispersity index were 25 934 Da and 1.211, respectively. At mass concentrations of 0.31~5.00 mg/mL, the scavenging capacities of the polysaccharides against DPPH, superoxide anion, hydroxyl, and ABTS+ radicals were concentration-dependent. The maximum ABTS+ radical scavenging rate reached 99.68%, which was comparable to that of ascorbic acid (VC). The polysaccharides showed no obvious cytotoxicity toward RAW264.7 cells. In the H2O2-induced oxidative damage model, the polysaccharides increased T-SOD, CAT, and GSH-Px activities from 0.17 U/mg protein, 1.21 U/mg protein, and 4.90 U/mg protein to 0.33 U/mg protein, 1.58 U/mg protein, and 8.88 U/mg protein, respectively, and decreased the MDA level from 15.92 nmol/mL to 8.89 nmol/mL in a concentration-dependent manner.【Conclusion】The obtained Artemisia argyi polysaccharides exhibited significant in vitro and intracellular antioxidant activity, exerting oxidative repair effects by enhancing antioxidant enzyme activities and reducing lipid peroxidation, thus indicating their potential for development as natural antioxidants.
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