共查询到19条相似文献,搜索用时 62 毫秒
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采用大豆卵磷脂、胆固醇为壁材,通过薄膜-超声分散法制备了表没食子儿茶素没食子酸酯(EGCG)脂质体(EGCG Liposome,EL),研究了胆固醇用量、水化温度、超声时间、EGCG添加量对EL粒径、PDI、包封率以及产率的影响.进一步对EL的透皮效果进行研究,并测定了其储藏稳定性.结果 表明,在卵磷脂和胆固醇的质量比... 相似文献
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为提高辅酶Q10(CoQ10)的透皮吸收效果,以辛酸/癸酸甘油三酯(GTCC)为液体脂质、鲸蜡醇棕榈酸酯(CP)为固体脂质,制备了不同质量分数固体脂质(以固液脂质的总质量为基准,下同)的Co Q10-脂质纳米囊,并对其稳定性及透皮性能进行了考察。结果表明,固体脂质的添加未对CoQ10-脂质纳米囊的粒径及储藏稳定性产生影响,粒径均为52 nm左右,储藏180 d后其粒径及外观均无明显变化;FTIR结果表明,Co Q10与脂质纳米囊之间未发生化学反应且能被很好地包埋在脂质纳米囊中;通过闭合效应、体外透皮实验及激光共聚焦的观察发现,当CP的质量分数增加至70%和95%时,Co Q10-脂质纳米囊能显著减少皮肤水分的蒸发,并更好地促进Co Q10透皮吸收,使表皮层和真皮层的荧光强度明显增强。 相似文献
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采用薄膜分散法制备格列齐特脂质体,以粒径和包封率为考核指标,通过单因素实验和正交实验优化制备条件,测定最优条件制备格列齐特脂质体的平均粒径和包封率。确定最优制备条件为:药脂比1∶10(g∶g)、超声时间10min、成膜温度60℃、缓冲液pH值6。所制备脂质体的平均粒径为(108.3±12.4)nm、包封率为(72.19±3.6)%、平均Zeta电位为(-40.8±2.3)mV,且在4℃下保存稳定性好。电镜照片显示,所制备脂质体圆整度好、粒径均一、无粘连。表明采用薄膜分散法制备格列齐特脂质体工艺稳定,质量可控。 相似文献
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目的:以薄膜分散法制备两性霉素B脂质体冻干粉(AMB-Lip-FDP),并进行其质量评价。方法:采用薄膜分散法制备AMB-Lip-FDP,考察冻干工艺对AMB-Lip-FDP外观、溶解性、粒径和包封率的影响,并对制备的冻干粉性质进行表征。结果:采用薄膜分散法制备的AMB-Lip-FDP为黄色蓬松粉末,溶解性好,略有引湿性,复溶后的平均粒径为(110.2±3.6) nm, PDI为0.187±0.026,Zeta电位为(-42.6±1.4) mV,包封率为93.6%±2.7%,稳定性较好。体外释放结果表明,PBS中48 h释放约65%,具有明显的缓释性。5%葡萄糖注射液稀释,室温48 h稳定。结论:采用优化后工艺制备AMB-Lip-FDP稳定可行,具有明显缓释特征,为该产品的生物等效性评价提供研究基础。 相似文献
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以丁二酸酐和壳聚糖(CS)为原料合成亲水性琥珀酰基壳聚糖(SCS),然后与月桂酰氯通过酰化反应制备了两亲性的琥珀酰基月桂酰壳聚糖(LSCS)。采用FTIR和1HNMR对壳聚糖衍生物进行了结构表征。LSCS的琥珀酰基的取代度为41.27%,月桂酰基的取代度为6.32%。改性后的壳聚糖在pH<3.0和pH>6.5时溶解度较好,在等电点及附近的pH范围内溶解度降低。LSCS具有较强的分子间相互作用,随其质量分数增加溶液黏度显著增加,且在质量分数达到2%时可形成物理凝胶。该物理凝胶对NaCl浓度较敏感,随着NaCl浓度的增加,凝胶强度减小。 相似文献
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驴皮中胶原蛋白的提取及其特性研究 总被引:1,自引:1,他引:1
分别采用酸法和酶法提取驴皮胶原蛋白,并测定了所提取胶原蛋白的性质。结果表明,两种方法提取的胶原蛋白紫外最大吸收峰都在234 nm处,在280 nm处吸收较小;两者红外吸收光谱相似,并且都具有三股螺旋结构;电泳图谱分析所得胶原蛋白的亚基组成形式为(α1)2α2,推测所提取的是Ⅰ型胶原蛋白;DSC(示差量热扫描法)测定发现,酶溶性胶原蛋白的热收缩温度(65.33℃)高于酸溶性胶原蛋白(50.90℃);羟脯氨酸测定发现,酶法提取驴皮胶原蛋白的纯度高于酸法提取驴皮胶原蛋白的纯度。 相似文献
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Preparation,characterization, and potential biomedical application of composite sponges based on collagen from silver carp skin 下载免费PDF全文
Ming‐Mao Chen Yu‐Qing Huang Hao Guo Yan Liu Jian‐Hua Wang Jiu‐Lin Wu Qi‐Qing Zhang 《应用聚合物科学杂志》2014,131(21)
To reuse fish processing waste for biomedical materials, collagen (Col) was extracted from silver carp skin, and Col–chitosan (Ch) composite sponges were prepared by a freeze‐drying method. The atomic force microscopy and electrophoresis results suggest the Col might have been type I. To obtain the optimum conditions for the manufacture of the Col–Ch sponges, the characteristics of sponges composed of different ratios of Col to Ch with different crosslinkers were evaluated. Scanning electron microscopy showed that the sponges had an interconnected network structure with porosity. Infrared spectroscopy demonstrated that intermolecular crosslinkages between Col and Ch occurred. The swelling measurements implied that all of the sponges could bind an 18‐ to 36‐fold amount of distilled water and still maintain their form and stability. When the ratio of Col to Ch was higher than 1:0.25, the swelling and degradation rate decreased with increasing Ch. Cell proliferation, hemolysis, and hemostasis assay indicated that the sponges exhibited noncytotoxicity, biocompatibility, nonhemolysis, and hemostatic efficacy. Overall, we concluded that the optimal ratio of Col and Ch for the sponges was 1:0.25, and glutaraldehyde crosslinking was more suitable than 1‐ethyl‐3‐(3‐dimethylaminopropyl) carbodiimide hydrochloride. These results demonstrate the potential application of silver carp skin Col–Ch sponges for tissue engineering and wound dressing in non‐weight‐bearing tissue. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40998. 相似文献
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比较研究了海蜇、牛骨和鳕鱼皮3种不同来源胶原肽对光老化皮肤成纤维细胞的修复作用。发现3种胶原肽均可显著提高光老化细胞的细胞增殖活性,经紫外照射后,人皮肤成纤维细胞Ⅰ型、Ⅲ型胶原蛋白及透明质酸合成量明显降低,表现为差异性极显著(P0.01),同时细胞内抗氧化酶系T-SOD、CAT和GSH-Px的抗氧化酶活力也都降低。当加入3种胶原肽后,光老化细胞的Ⅰ型、Ⅲ型胶原蛋白及透明质酸合成量与细胞内T-SOD、CAT和GSH-Px酶活力均有所增加,且改善光老化细胞内抗氧化酶活力与增加细胞胶原分泌效果较好的是海蜇胶原肽。 相似文献
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以狭鳕鱼皮胶原多肽、海藻糖和葡萄籽提取物(或藻蓝蛋白)组合物为主要活性成分,以质量分数分别为2.0%,1.0%和4.6%的羧甲基纤维素、海藻酸钠和聚乙二醇1 500为基质主成分,经溶解、搅拌、混合、均质等工艺制备水洗面膜。微生物挑战实验确定以质量分数为1.0%的市售GL-PLUS为面膜防腐剂。体外保湿抗衰老功效研究确定面膜活性成分的添加量(以质量分数计)为胶原多肽3.7%,海藻糖6.5%,葡萄籽提取物(或藻蓝蛋白)0.12%。耐热、耐寒和离心测试结果表明所得面膜具有良好的稳定性。 相似文献
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对鳝鱼皮中胶原蛋白的最佳提取工艺条件进行了研究.以超声提取时间、胰蛋白酶加入量、酶解时间、提取温度、pH 5个因素对提取工艺条件进行了优化,结果表明,最佳提取工艺条件为:酶加入量125 U/g、pH=7.2、温度35 ℃、超声波辅助提取时间3 min、酶解时间7 h,胶原蛋白的提取率达92.4%.利用紫外光谱和傅立叶变换红外光谱对胶原蛋白进行分析,结果表明,胶原蛋白的紫外特征吸收波长为226 nm,结构中含有肽键,羰基,羧基等蛋白质的特征官能团. 相似文献
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The pore structure of skin collagen matrix modified by organosilicone alone, combination of organosilicone and chromium respectively, was investigated mainly through nitrogen adsorption, scanning electron microscopy and fractal analysis. The results indicated that increasing the dosage of organosilicone endowed more numbers of uniform smaller pores, increased porosity in modified collagen matrix and improved thermal stability verified by differential scanning calorimeter analysis. A similar trend was observed after incorporating less amount of chromium to organosilicone modification in the process. It can be presumed that a rigid and stable three‐dimensional silica network structure formed in the interior of the collagen fiber plays a role in fixing the collagen molecular chain, conferring improved hydrothermal stability to the skin matrix. The findings are of great significance to explore chrome‐less and further chrome‐free silicone tanning technology, and are helpful to promote sustainable development of the leather industry. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44831. 相似文献