目的制备黄芩苷(baicalin,BCN)聚乙二醇维生素E琥珀酸酯(TPGS)纳米胶束(BCN-TPGS-PMs)以改善其溶解性和体外抗肿瘤效果。方法采用薄膜水化法制备BCN-TPGS-PMs;透射电子显微镜观察纳米胶束形态;粒度测定仪考察其粒径和Zeta电位;超速离心...目的制备黄芩苷(baicalin,BCN)聚乙二醇维生素E琥珀酸酯(TPGS)纳米胶束(BCN-TPGS-PMs)以改善其溶解性和体外抗肿瘤效果。方法采用薄膜水化法制备BCN-TPGS-PMs;透射电子显微镜观察纳米胶束形态;粒度测定仪考察其粒径和Zeta电位;超速离心法考察制剂的包封率及载药量;动态膜透析法考察体外释药特性;四甲基偶氮唑盐(MTT)法考察其对人乳腺癌细胞(MCF-7)的抑制作用。结果所制备的BCN-TPGS-PMs平均粒径为(11.91±0.14)nm;载药量和包封率分别为(5.42±0.04)%和(95.83±7.34)%;在体外p H 7.4、6.5的磷酸盐缓冲液(PBS)中24 h内分别释放28.53%和35.06%;表明所制备胶束粒径较小且均一,体外释放具有一定缓释性。同时体外细胞毒性实验表明BCN-TPGS-PMs较BCN能够显著地抑制MCF-7细胞的增殖(P<0.05)。结论所制备的BCN-TPGS-PMs粒径小,载药量高,稳定性好,能显著提高BCN的体外抗肿瘤效果。展开更多
Vitamin E succinate was synthesized in organic solvents using a modified Novozym-435 as catalyst.In order to improve the catalytic performance of Novozym-435,the enzyme was modified using acetic anhydride, propionic a...Vitamin E succinate was synthesized in organic solvents using a modified Novozym-435 as catalyst.In order to improve the catalytic performance of Novozym-435,the enzyme was modified using acetic anhydride, propionic anhydride and succinic anhydride separately.We found that both the hydrolytic activity and the thermal stability of the modified Novozym-435 were enhanced compared with the unmodified enzyme.The modified Novozym-435 catalysts were used to synthesize the succinate derivative of vitamin E.Compared with the native Novozym-435,the catalytic activity of the modified novozym-435 in promoting the synthesis of vitamin E succinate was dramatically increased,with the novozym-435 modified with succinic anhydride（N435-S）as the most active catalyst.Conditions for the synthesis of vitamin E succinate were also optimized.A mixture of tert-butanol and DMSO（volume ratio of 2︰3）was the most suitable medium for the reaction,whereas the appropriate molar ratio of vitamin E to succinic anhydride and reaction temperature were 1︰5 and 40°C,respectively.Under these reaction conditions,the yield of vitamin E succinate reached 94.4%.N435-S could be reused for five batches.展开更多
目的研究维生素E琥珀酸酯(vitamin E succinate,VES)对体外培养的人晶状体上皮细胞(HLECs)增殖的影响。方法人晶状体上皮细胞株HLECs-B3以VES刺激24h、48h、72h、96h,VES浓度为5μg/ml、10μg/ml和20μg/ml,用MTT比色法测定VES对细胞增...目的研究维生素E琥珀酸酯(vitamin E succinate,VES)对体外培养的人晶状体上皮细胞(HLECs)增殖的影响。方法人晶状体上皮细胞株HLECs-B3以VES刺激24h、48h、72h、96h,VES浓度为5μg/ml、10μg/ml和20μg/ml,用MTT比色法测定VES对细胞增殖的抑制作用;以流式细胞仪分析细胞周期。结果VES对人晶状体上皮细胞的增殖具有显著的抑制作用,表现为时间和剂量依赖关系。并且将细胞周期阻滞于G0/G1期。结论VES对体外培养的人晶状体上皮细胞的增殖具有抑制作用,为临床筛选防治后发性白内障的药物提供依据。展开更多
文摘目的制备黄芩苷(baicalin,BCN)聚乙二醇维生素E琥珀酸酯(TPGS)纳米胶束(BCN-TPGS-PMs)以改善其溶解性和体外抗肿瘤效果。方法采用薄膜水化法制备BCN-TPGS-PMs;透射电子显微镜观察纳米胶束形态;粒度测定仪考察其粒径和Zeta电位;超速离心法考察制剂的包封率及载药量;动态膜透析法考察体外释药特性;四甲基偶氮唑盐(MTT)法考察其对人乳腺癌细胞(MCF-7)的抑制作用。结果所制备的BCN-TPGS-PMs平均粒径为(11.91±0.14)nm;载药量和包封率分别为(5.42±0.04)%和(95.83±7.34)%;在体外p H 7.4、6.5的磷酸盐缓冲液(PBS)中24 h内分别释放28.53%和35.06%;表明所制备胶束粒径较小且均一,体外释放具有一定缓释性。同时体外细胞毒性实验表明BCN-TPGS-PMs较BCN能够显著地抑制MCF-7细胞的增殖(P<0.05)。结论所制备的BCN-TPGS-PMs粒径小,载药量高,稳定性好,能显著提高BCN的体外抗肿瘤效果。
基金Supported by the Fundamental Research Funds for the Central Universities and the State Key Development Program for Basic Research of China(2007CB714304)
文摘Vitamin E succinate was synthesized in organic solvents using a modified Novozym-435 as catalyst.In order to improve the catalytic performance of Novozym-435,the enzyme was modified using acetic anhydride, propionic anhydride and succinic anhydride separately.We found that both the hydrolytic activity and the thermal stability of the modified Novozym-435 were enhanced compared with the unmodified enzyme.The modified Novozym-435 catalysts were used to synthesize the succinate derivative of vitamin E.Compared with the native Novozym-435,the catalytic activity of the modified novozym-435 in promoting the synthesis of vitamin E succinate was dramatically increased,with the novozym-435 modified with succinic anhydride（N435-S）as the most active catalyst.Conditions for the synthesis of vitamin E succinate were also optimized.A mixture of tert-butanol and DMSO（volume ratio of 2︰3）was the most suitable medium for the reaction,whereas the appropriate molar ratio of vitamin E to succinic anhydride and reaction temperature were 1︰5 and 40°C,respectively.Under these reaction conditions,the yield of vitamin E succinate reached 94.4%.N435-S could be reused for five batches.
文摘目的研究维生素E琥珀酸酯(vitamin E succinate,VES)对体外培养的人晶状体上皮细胞(HLECs)增殖的影响。方法人晶状体上皮细胞株HLECs-B3以VES刺激24h、48h、72h、96h,VES浓度为5μg/ml、10μg/ml和20μg/ml,用MTT比色法测定VES对细胞增殖的抑制作用;以流式细胞仪分析细胞周期。结果VES对人晶状体上皮细胞的增殖具有显著的抑制作用,表现为时间和剂量依赖关系。并且将细胞周期阻滞于G0/G1期。结论VES对体外培养的人晶状体上皮细胞的增殖具有抑制作用,为临床筛选防治后发性白内障的药物提供依据。
