通过溶胶-凝胶法接枝在多糖微球表面的分子印迹聚合物用于蛋白质识别。
Molecularly imprinted polymer grafted on polysaccharide microsphere surface by the sol-gel process for protein recognition.
作者信息
Li Feng, Li Jing, Zhang Shusheng
机构信息
Key Laboratory of Eco-chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
出版信息
Talanta. 2008 Feb 15;74(5):1247-55. doi: 10.1016/j.talanta.2007.08.032. Epub 2007 Sep 5.
An interfacial organic-inorganic hybridization concept was applied to the preparation of a new spherical imprinted material for protein recognition. The functional biopolymer chitosan (CS), shaped as microsphere and high-density cross-linked, constituted of the polysaccharide core for surface imprinting. After the model template protein, bovine serum albumin, was covalently immobilized by forming imine bonds with the functional amine groups of CS, two kinds of organic siloxane (3-aminopropyltrimethoxysiloxane: APTMS, and tetraethoxysiloxane: TEOS) assembled and polymerized on the polysaccharide-protein surface via sol-gel process in aqueous solution at room temperature. After template removal, the protein-imprinted sol-gel surface exhibited a prevalent preference for the template protein in adsorption experiments, as compared with four contrastive proteins. Bioinformatics methods were also employed to investigate the imprinting process and the recognition effect. The influence of siloxane type, pH, siloxane/water ratio on template removal and recognition selectivity was assessed. Under optimized imprinting conditions, a large quantity of well-distributed pores was observed on the immobilized-template imprinted surface. The surface-imprinted adsorbent offered a fast kinetics for template re-adsorption and could be reused. Compared with the imprinted material prepared with free-template, material prepared with immobilized-template possessed higher adsorption capacity towards template protein. Easy preparation of the described imprinted material, high affinity and good reusability make this approach attractive and broadly applicable in biotechnology for down-stream processing and biosensor.
一种界面有机-无机杂化概念被应用于制备用于蛋白质识别的新型球形印迹材料。功能生物聚合物壳聚糖(CS)呈微球形且高度交联,由用于表面印迹的多糖核心构成。在模型模板蛋白牛血清白蛋白通过与CS的功能胺基形成亚胺键共价固定后,两种有机硅氧烷(3-氨丙基三甲氧基硅氧烷:APTMS和四乙氧基硅氧烷:TEOS)在室温下于水溶液中通过溶胶-凝胶过程在多糖-蛋白质表面组装并聚合。去除模板后,与四种对比蛋白相比,蛋白质印迹溶胶-凝胶表面在吸附实验中对模板蛋白表现出普遍的偏好。还采用生物信息学方法研究印迹过程和识别效果。评估了硅氧烷类型、pH值、硅氧烷/水比对模板去除和识别选择性的影响。在优化的印迹条件下,在固定模板印迹表面观察到大量分布均匀的孔。表面印迹吸附剂对模板再吸附具有快速动力学且可重复使用。与用游离模板制备的印迹材料相比,用固定模板制备的材料对模板蛋白具有更高的吸附容量。所描述的印迹材料制备简便、亲和力高且可重复使用性好,使得该方法在生物技术下游加工和生物传感器方面具有吸引力且广泛适用。