共查询到19条相似文献,搜索用时 93 毫秒
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药物控制释放系统能弥补传统给药方式在人体血药浓度、药效等方面的不足,并在控制药物释放速率的同时,保持药物有效浓度、降低毒副作用。本文在介绍该释药系统的基础上,以微凝胶结合具体实例阐述说明系统的应用原理及效果,研究发现微凝胶对模型药物具有控制释放作用。 相似文献
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含糖聚合物因其优良的亲水性和生物相容性成为近期研究的热点,并且被广泛应用于生物医药领域。综述了含糖聚合物作为药物缓释载体应用的新进展。 相似文献
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生物降解高分子材料在医药领域中的应用 总被引:7,自引:0,他引:7
简要介绍了生物降解高分子材料的定义、分类和降解机理,较为全面地阐述了当前生物降解高分子材料的应用领域,特别是在缓/ 控释材料、手术缝合线及组织工程中的应用。 相似文献
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高分子载体药物是随着药物学研究、生物材料科学和临床医学的发展而新兴的给药技术。高分子材料作为药物的载体越来越多的被应用于化工医药领域,这一技术受到了研究者们的重视,并且得到了较好的发展。文章介绍近年来研究比较广泛的高分子药物载体的应用情况、有关机理以及制备方法。 相似文献
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目的:以酸改性蒙脱土为药物载体,制备右旋布洛芬/酸改性蒙脱土复合物,提高右旋布洛芬的载药量,并探索载药复合物在不同释放介质中的释放规律。方法:首先用浓度为5%~20%的盐酸对蒙脱土进行预处理,利用X-射线衍射(XRD)、比表面积测定(BET)、扫面电子显微镜(SEM)等表征方法对蒙脱土进行结构表征,筛选最佳酸处理浓度;然后用溶液插层法将右旋布洛芬负载于酸化后的蒙脱土上,制得右旋布洛芬/酸改性蒙脱土复合物;采用透析法对右旋布洛芬/酸改性蒙脱土复合体系进行体外释放实验。结果:经酸改性后蒙脱土的结构发生改变,当酸浓度为15%时,蒙脱土的比表面积达到最大值246 m2/g。上载右旋布洛芬后,载药量最大可达352.4 mg/g。体外释放实验表明,右旋布洛芬/酸改性蒙脱土的累积释药百分量受pH的影响,当pH为1.2时,其累积释药百分量为18.6%,当pH为6.8时,则为89.3%。结论:盐酸改性蒙脱土有助于提高药物的负载量,右旋布洛芬/酸改性蒙脱土复合物具有良好的缓释作用并有一定的pH响应性,有望制成肠道缓释口服药物制剂。 相似文献
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R. F. T. Stepto 《Polymer International》1997,43(2):155-158
The thermoplastics processing of natural hydrophilic polymers in the presence of water is a recent development with very wide possible applications. Eventually, oil-based polymer materials could be replaced in many applications by inexpensive, natural products from renewable resources. As with conventional thermoplastics, hydrophilic polymer melts may be processed by injection-moulding and extrusion. The present contribution focuses on the injection-moulding of potato starch. The basis of the processing is described. In addition, the rheological behaviour of the starch/water melts during processing is analysed quantitatively to give apparent melt viscosities. The mechanical properties of moulded starch materials and the drug delivery behaviour of starch capsules are discussed. © 1997 SCI. 相似文献
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文章简要介绍了淀粉在纺织浆料中的应用概况,介绍丁淀粉浆料的种类及应用,特别强调了变性淀粉的应用情况,同时对纺织浆料今后的发展趋势进行了展望。 相似文献
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The aim of this study was to investigate the in vitro drug release behavior of sweet potato starch (SPS) microparticles intended for controlled drug delivery applications. Diclofenac sodium (DS) was used as a model drug candidate in the present study. SPS microparticles were prepared using a spray-drying technique by varying the polymer concentration and drug loading. The mean particles size of drug-loaded spray-dried SPS microparticles was between 10.3 and 13.1 µm. The mean particle size increased slightly with increase in the concentration of SPS. The mean particle size of spray-dried SPS microparticles increased from 10.3 to 13.1 µm when the concentration of SPS increased from 2 to 4% w/v. Under the current spray-drying conditions, the percentage yield of spray-dried SPS microparticles did not vary much among the various formulations and it was between 65.2 and 70.1%. The encapsulation efficiencies of SPS microparticles formulations was between 95.1–98.2%, suggesting good encapsulating ability of the SPS polymer by spary drying. Drug release from all the formulations of spray-dried SPS microparticles was controlled over period of 6 h. The cumulative amount of drug release from the spray-dried SPS microparticles decreased with an increase in the concentration of SPS, while it increases as the drug loading is increased. Release of the drug from spray-dried SPS microparticles followed Fick's law of diffusion since a good correlation coefficient (R2) was observed with the Higuchi plots (R2 = 0.9928 to 0.9979). 相似文献
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离子交换材料作为一种新型的药用高分子材料近年来在药剂学中的应用广泛,在药物传递系统中的应用研究迅速。但离子交换技术及离子交换材料在药剂学中的应用仍存在许多不足。归纳了离子交换材料的种类、特性,以及离子交换材料作为药物载体在药物制剂方面的应用。提出了研制功能性离子交换树脂辅料将是未来发展方向。 相似文献
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将2,2,6,6-四甲基哌啶-1-氧化物自由基(TEMPO)氧化纳米纤维素(NFC)与广谱抗菌剂莫西沙星通过物理共混、真空抽滤制备出具有缓释和抗菌特性的莫西沙星/NFC缓释膜。研究了NFC的羧基含量、制备NFC时的均质次数对莫西沙星/NFC缓释膜的力学性能、溶胀性能以及药物释放性能的影响,同时探究了缓释膜的抑菌效果。结果表明:当NFC含羧基为1.13 mmol/g,NFC制备时的均质次数为8次时,莫西沙星/NFC缓释膜的弹性模量为3.48 GPa,其平衡溶胀率比NFC膜高,可达到6.03,药物负载率为21%,在体外8 h释药量为19.96%。不同羧基含量的莫西沙星/NFC缓释膜的药物释放曲线均符合Peppas方程;均质次数和pH值增加时,缓释膜的药物释放由渗透和溶胀释放为主转为浓度差驱动的扩散释放为主,相应地其释放曲线由符合Higuchi方程转为符合Peppas方程。莫西沙星/NFC缓释膜对标准金黄色葡萄球菌的抑菌圈直径在4.38~6.33 mm范围内,有着明显的抗菌作用,含羧基1.70 mmol/g,均质次数8次的莫西沙星/NFC缓释膜抑菌效果最好。 相似文献