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投稿时间:2017-06-01
投稿时间:2017-06-01
中文摘要: 以油菜花粉多糖为原料,采用氢氧化钠-氯乙酸法,分别在 0.5 mol/L 和 2.0 mol/L NaOH 浓度条件下对油菜花粉多糖(rape pollen polysaccharides,RPP)进行羧甲基化修饰,并对其清除羟自由基(·OH)、超氧阴离子自由基(O2·)和1,1-二苯基-2-三硝基苯肼(1,1-diphenyl-2-picrylhydrazyl,DPPH)自由基的能力进行研究。结果表明:羧甲基与油菜 花粉 多 糖形 成 羧 甲基 化 合物 , 得 到 取代 度 分别 为 0.47 和 0.55 的 2 个 改 性产 物 , 羧 甲 基 油 菜 花 粉 多 糖 1 (Carboxymethylated rape pollen polysaccharide1 ,CM-RPP1) 和羧甲基油菜花粉多糖 2 (Carboxymethylated rape pollen polysaccharide 2,CM-RPP2),RPP、CM-RPP1 和 CM-RPP2 表现出不同程度的抗氧化活性,总的自由基清除能力大小为 CM-RPP2>CM-RPP1>RPP。与未修饰油菜花粉多糖相比,羧甲基化修饰能提高油菜花粉多糖的体外抗氧化活性。
Abstract:Polysaccharides from rape pollen (RPP) was carboxymethylated by alkaline chloroacetic acid at 0.5 mol/L and 2.0 mol/L NaOH respectively to obtain carboxymethylated rape pollen polysaccharides(CM-RPP).The scavenging capacities of hydroxyl free radicals, superoxide anion radical, 1,1-diphenyl-2 - picrylhydrazyl were assayed,with vitamin C (VC) as control.The results were that two carboxymethylated polysaccharides of RPP with degree of substitution (SD) of 0.47 and 0.55, named carboxymethylated rape pollen polysaccharide1 (CM-RPP1) and carboxymethylated rape pollen polysaccharide 2(CM-RPP2), were obtained. RPP, CM-RPP1 and CM-RPP2 had certain scavenging ability to OH·free radical, O2·free radical and DPPH free radical. Total antioxidant activity was CM-RPP2>CM-RPP1>RPP. Compared with RPP, the antioxidant activity of polysaccha- rides in rape pollen can be improved through carboxymethylation.
文章编号:201717007 中图分类号: 文献标志码:A
基金项目:贵州省科技合作计划项目(黔科合字[2015]7210)
Author Name | Affiliation |
YAO Qiu-ping,WEI Ya-li, YANG Qiong, LU Qing-zhu | School of Chemistry and Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, Guizhou,China |
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