载神经生长因子纳米柔性脂质体制备及稳定性研究

目的：研究载神经生长因子（ NGF）纳米柔性脂质体的适宜制备的条件及稳定性。方法采用薄膜-超声法制备载NGF纳米柔性脂质体,ELISA法测定NGF含量,激光粒度分析仪检测粒径。结果制备载NGF纳米柔性脂质体的最适温度为30℃;pH值为7 R．0时,制备的纳米脂质体包封率最高;磷脂的适宜浓度为40 mg/ml;胆固醇与磷脂适宜比例为1∶4。室温保存30 d、4℃冰箱12个月,脂质体粒径无明显变化。结论本研究初步确定了载NGF纳米柔性脂质体的适宜制备条件,制备的脂质体具有较好稳定性。     

Multi-centered clinical study on effects of nano-Amomi Paste in treating children’s anorexia

Objective： To assess the effect and safety of nano-Amoni Paste （nmAP） in the treatment of children＇s anorexia （AR）. Methods： One hundred and eighty patients of AR were assigned according to the randomized, double-blinded, double-simulated and parallel controlled principle to three groups, the treated group （TG）, the positive control group （PCG） and the negative control group （NCG）, 60 in each group. The patients in TG were treated by sticking 1.5 ml of nmAP on the acupoint of Shenque （Ren 8） once a day and orally taking placebo liquid 10 ml twice a day; those in PCG and NCG treated with sticking paste of placebo on Ren 8, and oral taking of Shanmai Jianpi Oral Liquid （山麦健脾口服液） and placebo liquid respectively, 10 ml each time twice per day. The course of treatment for all was 10 days, all patients were treated for 2 courses. Results： The total effective rate and the effective rate on cardinal symptom in TG was 85.0% and 95.0% respectively, that in PCG 86.2% and 96.55% and in NCG 45.5% and 65.45%, respectively, showing significant difference between groups （P〈0.05）. Comparison of the clinical manifestation before and after treatment showed significant improvement in volume of food intake, appetite, complexion and reduction of restlessness symptom （P〈0.05） in all three groups, and there was no adverse reaction found in them. Conclusion： nmAP is an effective and safe remedy for treatment of Children＇s anorexia.     

青蒿琥酯纳米脂质体抗人肝癌HepG2细胞作用研究

目的:将青蒿琥酯纳米脂质体与青蒿琥酯原料药对比,研究其体外抗肝癌作用.方法:应用青蒿琥酯纳米脂质体和原料药作用HepG2细胞,MTT法检测对细胞的增殖抑制作用;用hoechst 33258染色法观察细胞凋亡的形态学改变.应用RT-PCR检测细胞凋亡因子caspas-3表达.结果:青蒿琥酯纳米脂质体及原料药抗肝癌作用呈浓...     

Application of the combined use of ultrasonic homogenization and electro-spraying in the formation of nano carrier systems

Chitosan-coated nano-liposomes containing etofenprox were prepared by ultrasonic homogenization (UH) and a combined use of UH and electro-spraying. The physicochemical properties of the resulting samples were examined and compared. The two methods yielded similar values and tendencies, except for encapsulation efficiency that differed by an average of 15%. In the coating process, as the chitosan concentration increased (0.1–0.5%, w/v) and the degree of deacetylation increased (chitosans A, B and C), the surface charge of the nano carrier likewise increased and carrier size distribution was altered. The encapsulation efficiency as measured by gas chromatography decreased slightly with the increasing chitosan concentration (0.1–0.5%, w/v). The results indicate that diverse preparation conditions could affect the physicochemical properties of the resulting nano carrier systems.     

光敏纳米脂质体制备及其特性研究

目的制备聚丁二炔光敏纳米脂质体并对其特性进行研究。方法采用反相蒸发法制备聚丁二炔纳米脂质体。原子力显微镜观察脂质体形态，激光粒度分析仪测定脂质体粒径与表面电位。结果制备的光敏纳米脂质体形状规则，平均粒径（78．3±1．4）nm。结论采用反相蒸发法制备的聚丁二炔纳米脂质体，达到设计要求。     

纳米马钱子碱脂质体制备工艺研究

目的:采用薄膜-超声分散法制备马钱子碱脂质体,考察了表面活性剂浓度,脂材比例,外水相条件,制备温度及药物浓度对马钱子碱脂质体粒径及包封率的影响.方法:薄膜-超声分散法制备纳米级马钱子碱脂质体,凝胶色谱-可见光比色方法测定包封率.结果:采用薄膜-超声法制备的脂质体多为大单室脂质体,粒径主要分布在50～300 nm.脂材比例为3:10,表面活性剂Tween-80与总脂材比为3:10,制备温度为40℃,水相pH值为7.4时得到了粒径均匀、分散性好,包封率达61.24%的马钱子碱脂质体.结论:薄膜超声法是制备纳米马钱子碱脂质体的一种简单可行的方法.     

纳米脂质体承载榄香烯诱导C6胶质瘤细胞凋亡的实验研究

目的 探讨纳米脂质体承载榄香烯诱导C6胶质瘤细胞凋亡的作用以及对相关基因caspase-3表达的影响。 方法 以同等剂量的榄香烯－纳米脂质体、普通榄香烯和空白培养液作用于C6胶质瘤细胞,分别于0、48、72 h时通过流式细胞仪检测C6胶质瘤细胞的凋亡情况,以免疫组织化学法检测Caspase-3蛋白的表达。 结果 榄香烯－纳米脂质体和普通榄香烯组细胞瘤于48 h和72 h时出现了明显的凋亡,而且其凋亡率明显高于空白对照组。榄香烯－纳米脂质体和普通榄香烯组细胞瘤48 h和72 h时出现了明显的Caspase-3蛋白表达,而且其蛋白表达率也明显高于空白对照组。 结论 榄香烯具有促进C6胶质瘤细胞凋亡和Caspase-3蛋白表达的作用,经纳米脂质体承载后榄香烯的这种作用有增强的趋势。     

盐酸青藤碱柔性纳米脂质体的制备及质量考察

目的制备盐酸青藤碱柔性纳米脂质体,并研究其质量。方法用微柱离心法分离脂质体和游离药物,用HPLC法测定包封率。考察薄膜分散法、逆向蒸发法和pH梯度法对包封率的影响,并采用正交实验设计筛选盐酸青藤碱柔性纳米脂质体的最佳处方,测定其粒径。结果三种制备方法得到的药物脂质体的包封率大小依次为:pH梯度法>逆向法>薄膜法。正交实验设计中影响包封率的最显著因素为磷脂与胆酸钠的质量比,其次为外水相pH值,药脂比与孵育温度影响较小。最佳处方平均粒径128.4 nm,4℃放置30 d未产生聚积或沉淀。结论pH梯度法适合于制备盐酸青藤碱柔性纳米脂质体,工艺可行,产品质量稳定。     

星点设计-效应面法优化蛋白纳米脂质体的制备工艺

目的研究星点设计-效应面法在蛋白纳米脂质体制备工艺中的优化效果。方法同时考察胆固醇/卵磷脂不同比值、牛血清白蛋白浓度、外水相表面活性剂浓度和内水相/有机相比值对纳米脂质体的平均粒径和包封率的影响。结果优化得到的制备处方和工艺是胆固醇/卵磷脂比值为0.45,牛血清白蛋白浓度为10mg/mL,表面活性剂浓度为1%,内水相/有机相比值为0.5。以该条件制备的牛血清白蛋白脂质体平均粒径为176nm,包封率59.8%。结论星点设计-效应面法能够准确的反应多因素、多水平交互影响,适用于制剂处方和工艺的优化设计。     

载神经生长因子纳米柔性脂质体透血-脑屏障的研究

目的研究纳米柔性脂质体对促进神经生长因子（NGF）突破血脑屏障的作用。方法采用薄膜-超声法制备载NGF纳米柔性脂质体,免疫荧光法观察纳米柔性脂质体对NGF进入星形胶质细胞和血管内皮细胞的影响。根据实验要求分为对照组、游离NGF组、载NGF纳米柔性脂质体组。结果载NGF纳米柔性脂质体平均粒径为（83．1±1．7）nm,包封率为（64．2±2．8）％;对于星形胶质细胞和血管内皮细胞,游离NGF组细胞的NGF含量与对照组比较差异均无统计学意义（P〉0．05）,而载NGF纳米柔性脂质体组[（33．52±6．45）、（27．26±4．08）]则显著高于对照组[（8．31±2．15）、（0．00±0．00）]（P〈0．05）。结论载NGF纳米柔性脂质体具有较高的包封率,纳米柔性脂质体可能成为蛋白质类大分子药物有效突破血脑屏障的载体。