聚乙二醇与氯化钙形成配合物的表征

用红外光谱、X射线光电子能谱、DSC和电导率等研究了乙醇溶液中PEG与CaCl_2发生的相互作用。PEG和PEG-CaCl_2的测试结果表明,由于CaCl_2的加入,PEG中C-O-C键以1110cm~(-1)为中心的红外特征吸收峰漂移至1073cm~(-1)处。对PEG和PEG-CaCl_2进行DSC分析,发现后者的熔点显著升高(从53.6℃升至74.1℃),将PEG-CaCl_2体系的O_1s和Ca_2p X射线光电子能谱分别与PEG和CaCl_2的能谱作比较,得知体系的O_1s电子结合能升高约3eV,Ca_2p电子结合能降低0.4eV。说明氧原子上的孤时电子部分转移到钙离子的外层空轨道,可以认为有O→Ca配位键存在。由电导率测试结果可知,1个Ca~(2+)与大约4个PEG的链节单元形成配值结构物。     

周强绿色满园关不住

郑开泰从上海机械学院机械工程专业毕业后进入复旦大学科教仪器厂工作。他主持研制开发的膜式人工肺和环氧膜塑料分别获得1990年国家级重点新产品称号;1995年郑开泰创建民营企业上海心安实业有限公司,并出任总经理。公司先后打开全国医院客户60余家,销售额年年翻番。     

“新型生物活性硬组织替代材料”通过项目验收

华南理工大学材料科学与工程学院王迎军教授等承担的国家自然科学基金重点项目“新型生物活性硬组织替代材料”于 2 0 0 4年 6月 2 2日通过了由国家自然科学基金委员会工程与材料科学部组织的项目验收 .该项目从材料设计的思想出发 ,设计了生物活性梯度涂层 ,并采用先进的等离子喷涂技术制备出从生物惰性到生物活性、结构由致密到多孔的生物活性梯度涂层 ,经过特殊的后处理 ,涂层的结合强度达到 5 3MPa ,显著高于目前国内外同类材料的性能指标 .动物实验表明 ,所制备的生物活性梯度涂层材料具有很好的生物相容性和生物活性 .该项目对涂层材…     

基因活化聚乳酸表面工程的初步研究

运用层层自装(layer-by-layer self-assembly)技术,在聚乳酸表面形成半乳糖苷化的壳聚糖(galactosylated chitosan, GC)/DNA多层膜结构,构建基因活化的生物材料.用接触角测试仪及紫外吸收光谱仪监控多层膜的组装过程及DNA的释放行为,倒置荧光显微镜观察HepG2细胞在GC/DNA多层膜修饰的聚乳酸表面的细胞形态及生长状态.结果表明:GC/DNA的交替吸收在聚乳酸表面形成了多层膜结构,DNA在PBS缓冲液(pH=7.4, 37 ℃)中的释放可持续42 h以上.黏附在多层膜修饰的聚乳酸表面的HepG2呈现纺锤样的细胞形态.另外,半乳糖是肝细胞表面无唾液酸糖蛋白的受体,从多层膜上释放出来的GC/DNA颗粒可被肝细胞特异识别并结合.     

生物材料的生物制造成形方法

采用生物制造方法获取人工器官是取代同种和异种器官移植以及机电式人工器官植入的极具发展潜力的方法．生物医学信息是生物制造的生理和几何基础,而生物材料是生物制造的物质基础．文中从生物材料成形方法学角度,对常见生物材料的成形和应用进行了归纳和对比．指出生物制造技术是获取具有复杂空间结构和生物功能支架、组织前体的最具希望的方法．     

Recent development of peptide self-assembly

Amino acids are the building blocks to build peptides and proteins. Recent development in peptide synthesis has however enabled us to mimic this natural process by preparing various long and short peptides possessing different conformations and biological functions. The self-assembly of short designed peptides into molecular nanostructures is becoming a growing interest in nanobiotechnology. Self- assembled peptides exhibit several attractive features for applications in tissue regeneration, drug delivery, biological surface engineering as well as in food science, cosmetic industry and antibiotics. The aim of this review is to introduce the readers to a number of representative studies on peptide self-assembly.     

2014-14 科技人才招聘

正院长[上海]上海交通大学生物医学工程学院招聘院长。方向:生物医疗仪器、神经科学与工程、医学影像与信息、纳米生物材料、系统生物医学和生物科学等。要求:具有博士学位,具有教授及以上职称,能够全职到校工作。联系人:吴映强,电话:021-34206258,电子信箱:sjtuzzb@sjtu.edu.cnhttp://www.sciencenet.cn院长[天津]河北工业大学     

抗凝血生物材料研究中的表面分析方法

开发抗凝血生物材料最主要的目的就是要找到一种在与人体血液和组织相接触后不会引起血栓、凝血和炎症等特性的高分子材料,而抗凝血生物材料的以上特性与其表面性质紧密相关.因此,需要对新合成的材料的表面性质进行表征.综述了近年来应用得比较广泛的7种用于抗凝血生物材料表面性质分析的常规方法和1种新兴的核分析方法,并以在研究中的运用为实例,介绍了各种方法的原理、特点以及一些不足,指出只有借助多种分析方法,才能全面了解抗凝血生物材料的表面结构.     

Sulfoalkyl ether β-cyclodextrin derivatives synthesized by a single step method as pharmaceutical biomaterials

We report a simple ＂one pot＂ single step method to synthesize sulfoalkyl ether β-cyclodextrin （β-CD） derivatives in aqueous solution, which avoids the limitations associated with commonly used organic synthesis of such derivatives including multi-step reactions, use of expensive, toxic, and often environmentally hazardous organic solvents and/or reagents. Using this method, we obtained sulfopropyl and sulfobutyl ethyl β-CDs. We characterized these two derivatives and evaluated their ability to enhance solubility of fluconazole, a commonly used antifungal drug with poor water solubility. Experimental results indicate that these derivatives are structurally analogous to some of the commercially available β-CD derivatives. More importantly, when they formed supramolecular inclusion complexes with fluconazole, they demonstrated similar, if not better, capacity to enhance fluconazole solubility compared with commercially available β-CD derivatives, suggesting that the simple ＂one pot＂ single step synthesis may provide an effective alternative approach to produce large quantity of β-CD derivatives as pharmaceutical biomaterials for medicinal applications.     

Novel Chitosan-based Biomaterials

1 Introduction Chitosan with two long side chains of N-alkyl group is an important amphiphilic material, which has potential application in tissue engineering and drug delivery system. In this paper the amphiphilic N, N-dilauryl chitosan has been prepared by the phase transfer catalysis. The π-A isotherms of the products were measured in order to find some fundamental data for making self-assembled vesicles out of this kind of material. The LB film experiment indicates that N, N-dilauryl …