医用热熔胶的研究与应用

BACKGROUND: Hot-melt adhesive is safe and environmental friendly adhesive due to free of solvent, which is particularly suitable for medical applications. OBJECTIVE: To describe the types and characteristics of currently used hot-melt adhesives and to prospect the technical research and development of hot-melt adhesive for polyolefin tubes or catheters as well as to point out the corresponding key points to the hot-melt adhesion. METHODS: Literature search was carried out in SCI, Elsevier, and CNKI with the key words of “hot melt adhesive, medical application” in English and Chinese, respectively, for the initial retrieval of relevant articles or patents published January 1995 to December 2015. RESULTS AND CONCLUSION: To date, the medical hot-melt adhesives reported in the literature could be grouped as amorphous polyolefin, thermoplastic elastomer, acrylic and polyurethane types. The heat resistance of the most of the hot-melt adhesives does not meet the requirement for steam sterilizing process. In the present review, a strategy is proposed to develop a novel hot-melt adhesive which is good for binding polyolefin parts and can undergo the sterilization process. Given this, it is essential to choose a kind of polypropylene random copolymer with a suitable melting point as a substrate. With the aid of an adjuvant agent, therefore, we can develop a novel hot-melt adhesive that exhibits a lower melting point than the polyolefin tube, withstands steam sterilization temperature to ensure that the tube is not deformed during melt adhesion and is not become invalid during sterilization.      

姜黄素/聚(α-氰基丙烯酸异丁酯)载药微球的制备及其药物释放

以α-氰基丙烯酸异丁酯(iBCA)为原料、泊洛沙姆188为乳化剂,以捏合法制得的姜黄素(Cur)/羟丙基-β-环糊精(HP-β-CD)包合物(Cur-HP-β-CD)为负载药物,经一步乳化法制得姜黄素/聚(α-氰基丙烯酸异丁酯)载药微球(Cur-HP-β-CD-PiBCA)。考察乳化剂、负载药物的浓度对微球粒径与分布、微球载药率及包封率的影响,并对载药微球的药物释放进行了研究。结果表明:随着乳化剂浓度从0.01%增加到0.07%,载药微球粒径下降,粒径分布变宽,载药率和包封率均增加,适宜的乳化剂浓度为0.05%;随着药物浓度从0.03%增加到0.07%,微球载药率升高,包封率下降;载药微球的载药率越高,最终的药物累积释放百分率越低。姜黄素经包合和负载,不仅可以有效改善其亲水性,而且可以提高其溶出度,为提高姜黄素的生物利用度奠定了基础。     

含疏水链节的聚N-异丙基丙烯酰胺共聚物的温敏性

采用溶液聚合法合成了一系列N-异丙基丙烯酰胺(NIPAM)与甲基丙烯酸甲酯、丙烯酸乙酯、丙烯酸丁酯或甲基丙烯酸丁酯的无规共聚物,用浊度观测法和光散射法测定了不同共聚物水溶液的温敏相转变行为.结果表明:所得共聚物的低临界溶解温度(LCST)均低于均聚物PNIPAM的,酯类单体的结构和含量对共聚物的LCST有显著影响,其中酯基上的烷基对共聚物LCST的影响能力大于丙烯酸酯α位上的烷基,前者对增大共聚物的疏水性有更大贡献.通过NIPAM与特定丙烯酸酯单体进行无规共聚可以合成转变温度低于PNIPAM均聚物且具有预设LCST数值的水溶性温敏聚合物.