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海藻硒多糖的合成及生物活性研究
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摘要
采用直接水提法对琼枝麒麟菜中的多糖进行提取,乙醇沉淀得麒麟菜多糖,红外光谱表明其主要为卡拉胶。在硝酸-氯化钡或硝酸催化作用下,利用亚硒酸钠对麒麟菜多糖进行分子修饰,合成了硒化麒麟菜多糖,透析除去过量的亚硒酸钠,抗坏血酸检测,约24小时不显红色时停止透析,较好的反应条件是硝酸体积浓度为0.5%,70℃反应10小时,透析24小时后,ICP测得此时硒含量为0.413mg/g,多糖回收率为0.73%。利用红外光谱详细分析了不同反应条件对合成硒多糖结构的影响,透析后硒多糖在930和850cm~(-1)的吸收峰强度减弱,这是因为硝酸存在下多糖部分降解成为小分子寡糖,并能在透析时被除去。对比不同反应条件下和不同透析时间得到硒多糖中的硒含量,亚硒酸根主要与小分子寡糖结合,硒多糖的核磁共振光谱也证实了硒多糖与多糖在结构上的差别。观察到硝酸-氯化钡或硝酸催化合成的硒多糖的效果相差不大,因此可以改进文献方法只用硝酸催化,此外还通过抗坏血酸还原过量亚硒酸钠,得到硒多糖分散的纳米硒,简化了提纯硒多糖的步骤。
     采用四甲基偶氮唑盐比色法(MTT法)研究了硒多糖和硒多糖分散的纳米硒对人喉上皮细胞癌HEp-2、人白血病细胞K562及人肺癌细胞H460细胞株的抑制作用。硒多糖具有良好的抗HEp-2细胞癌活性,且抑制作用大于麒麟菜多糖和亚硒酸钠,硒多糖对K562和H460细胞癌的抑制作用大于麒麟菜多糖,但同等剂量条件下的病毒抑制率低于亚硒酸钠,各硒化麒麟菜多糖的抗癌活性具有浓度依赖性特点。硒多糖分散的纳米硒在低剂量下具有优良的抗HEp-2病毒活性,其IC_(50)为硒化麒麟菜多糖的1/291,可望开发成抗肿瘤药物。
     本文还研究了等摩尔SDS/非离子表面活性剂反胶束中纳米硒的合成,探究了不同表面活性剂复配后对纳米硒形貌的影响。
Sulfated polysaccharide was extracted from Eucheuma gelatinae with distilled water, precipitated with ethanol. FT IR spectrum of the polysaccharide indicated that it is κ-carrageenan. Seleno-polysaccharides were prepared by employing sodium selenite to modify the polysaccharide under the catalysis of HNO_3-BaCl_2 or HNO_3. Dialysis was applied to remove the excess sodium selenite. It was about 24hrs to stop dialysis when the red detected by ascorbic acid stopped to appear. The favor reaction conditions were at 70℃ for 10 hours in the presence of 0.5% volume concentration of nitric acid. The selenic content determined by ICP of seleno-polysaccharide obtained under such condition was 0.413mg/g, while the yield of seleno-polysaccharide was 0.73 %. The absorption bands of seleno-polysaccharide at 930 and 850 cm~(-1) became weak after dialyzing. The reason is part of the macromolecular polysaccharide can be decomposed to form oligosaccharide which can be remove by dialysis in the presence of nitric acid. Selenite is bonded mainly to the oligosaccharide by comparing selenium contents in seleno-polysaccharides obtained under different reacting conditions and after dialyzing for different time. ~(13)C-NMR confirmed the structural difference between seleno-polysaccharide and polysaccharide. The effects catalyzed by HNO_3-BaCl_2 or HNO_3 on seleno-polysaccharide are similar. Thus, nitric acid can only be used as catalyst by improving the reported method. Excess selenite in the seleno-polysaccharide catalyzed by nitric acid was reduced by ascorbic acid, and nano-selenium dispersed by seleno-polysaccharide was prepared.
    The inhibiting effects of seleno-polysaccharide and nano-selenium dispersed by seleno-polysaccharide on HEp-2, K562, and H460 were studied by MTT method. The results showed that seleno-polysaccharide significantly inhibited the proliferation of HEp-2 cells in vitro. Compared with natural polysaccharide or sodium selenite containing the same amount of Se, the seleno-polysaccharide was more effective. Seleno-polysaccharide was more effective on K562 and H460 cells than natural polysaccharide, but less effective than sodium selenite in the same amount. The inhibition relies on the concentration of the seleno-polysaccharide. Nano-selenium dispersed by seleno-polysaccharide revealed
引文
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