共查询到20条相似文献，搜索用时 86 毫秒
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采用乳化-交联法研究了左氧氟沙星磁性明胶微球的制备及其缓释性能.选取左氧氟沙星与明胶的比例、水油比、明胶浓度、戊二醛用量四个因素进行正交实验,优化最佳合成工艺.采用动态透析法测定载药微球的体外释放特性,同时对载药微球的形态、粒径、磁性及包覆情况进行表征.结果表明,载药微球最佳制备工艺为:明胶浓度15%,左氧氟沙星明胶比1∶2,水油比1∶5,戊二醛用量3.6mL;包封率为8.89%,载药量为51.36%;微球5h体外累积释药百分率人工肠液中达到64%,人工胃液中达到72%,具有较好的缓释性能,体外释放符合一级动力学方程;磁性明胶微球成球性良好,分布均匀,Fe3O4及左氧氟沙星被明胶包覆. 相似文献
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以载药量和包封率为指标,采用乳化分散-交联法制备熊果酸-壳聚糖微球,并应用星点设计-响应面法对乳化温度、药材比、油水比进行优化.实验结果显示,熊果酸-壳聚糖微球的最优制备工艺为：乳化温度为41.5℃、药材比为2.84∶1、油水比为2.83∶1.在此条件下制备的熊果酸-壳聚糖微球的平均包封率为88.7%,平均载药量为30.48%.采用星点设计-响应面法优化熊果酸-壳聚糖微球,其制备工艺简便,预测值与实验值的吻合度较高,预测性良好. 相似文献
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PLGA载多柔比星磁性纳米微球的制备与表征 总被引：2，自引：0，他引：2
董鑫 《常熟理工学院学报》2008,22(10):43-45
采用复乳法制备了PLGA载多柔比星磁性纳米微球,并对其形貌、粒径、磁性、包封率、载药量等特性进行了表征．实验结果证明,微球形貌良好,粒径分布在20±5nm范围内,在乳液中分散均匀,具有一定的磁性,微球包封率为41．2％,载药量为0．4％．微球制备方法简便易行,效果良好,各项特性指标符合药物载体要求,在生物活体癌症靶向治疗中具有潜在应用价值． 相似文献
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目的:探索白藜芦醇羧甲基壳聚糖微球的最优处方。方法:采用乳化交联法制备微球,以成球性、载药量、包封率为评价指标,应用单因素和正交设计试验优化工艺处方。结果:优化所得处方为:白藜芦醇与羧甲基壳聚糖质量比为1∶1,羧甲基壳聚糖浓度3.5%,溶液p H 7,司盘-80用量6%,固化剂用量为1m L。优化处方制备的微球近似呈球形,表面较光滑,载药量、包封率分别为22.7%和45.4%,微球粒径在10~100μm范围内。结论 :该处方制备出的微球具有较好的载药量和包封率。 相似文献
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采用乳化溶剂挥发法、基因重组和蛋白纯化技术，制备了穿膜肽修饰的3-羟基丁酸-3-羟基己酸共聚酯(PHBHHx)负载紫杉醇(PTX)递药系统。通过调控乳化剂的种类、用量、包封材料与药物比例优化了纳米微球的尺寸、药物包封率及载药量，并对递药系统的尺寸、形貌进行了表征。结果表明：水包油型乳化剂选用0.5 mL的吐温-20、水相乳化剂选用60 mL(1%)聚乙烯醇，微球尺寸达到150 nm左右时，均匀性良好；PTX与PHBHHx比例为1∶50时，药物包封率及载药量达到最优，分别为81.02%和50.9 mg/g;递药系统分散度好，表面略显粗糙，基本呈球形，粒径约为150 nm。在最优条件下制备的PTX载药系统粒径较小，包封率较高，易实现功能化蛋白修饰，为PTX纳米药物提供了一种新的设计思路。 相似文献
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探索滁菊挥发油微囊的最佳制备工艺。采用复凝聚法制备滁菊挥发油微囊,以外观形态、粒径、包封率、载药量为指标,正交设计优选工艺条件。滁菊挥发油微囊的最佳制备工艺条件为:复合胶与挥发油的比例为1∶1,温度为55℃,p H为4.0,固化剂量为1.5m L。制得的滁菊挥发油微囊形态呈圆形、光滑,粒径分布在80~120μm,平均包封率为(48.89±5.93)%,平均载药量为(13.11±2.30)%,TLC法显示供试品溶液与对照品溶液在相同的位置出现相同斑点。该制备方法操作简单易行,处方合理,制得微囊外观圆整,载药量和包封率较高。 相似文献
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《赤峰学院学报(自然科学版)》2017,(3)
恶性肿瘤是近代威胁人类健康的重大疾病之一,改变给药方式是目前抗肿瘤药研究的一个发展趋势,多孔微球作为一种药物新剂型,在药物新制剂的研发以及新剂型的改造方面应用广泛.本文以抗肿瘤药物紫杉醇为模型药物,聚乳酸羟基乙酸(PLGA)为载体,采用复乳溶剂挥发法(W/O/W)法制备载紫杉醇PLGA多孔微球.实验采用扫描电子显微镜、体外释放等方法评价载药多孔微球的性能;采用MTT法评价该载药微球体外对A549人肺癌细胞的抗肿瘤活性.实验显示,载紫杉醇PLGA多孔微球对A549人肺癌细胞生长具有明显的抑制作用.上述结果表明实验所得载药多孔微球具有良好的药物缓释特性及抗肿瘤效应,是一种具有良好应用前景的肺部给药载体. 相似文献
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以壳聚糖为载体、盐酸左氧氟沙星为目标药物,采用乳液聚合法制备出壳聚糖盐酸左氧氟沙星载药微球;考察了载药微球的体外释放性能并将该载药微球进行小鼠灌胃给药研究.结果表明:该制备方法简单可行,且小鼠急性毒性较低. 相似文献
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冷冻干燥法制备隐丹参酮纳米脂质体 总被引：1，自引：0，他引：1
张晓伟 《忻州师范学院学报》2008,24(5)
目的：用大豆卵磷脂作为载体,以隐丹参酮作为模型药。制备隐丹参酮纳米脂质体。方法：用超声一匀浆一冷冻干燥法制备隐丹参酮纳米脂质体。采用透射电镜测试隐丹参酮脂质体的粒径,用激光粒度分布仪测试平均粒径及粒度分布。结果：冷冻干燥法制备隐丹参酮纳米脂质体的粒径20—80nm之间。随着大豆卵磷脂与隐丹参酮配比的减小,粒径逐渐减小,包封率逐渐减小。体外释药表现为零级动力学释药特征。结论：用超声一匀浆一冷冻干燥法制备隐丹参酮纳米脂质体的方法可行。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献