近年来通过自组装膜将生物活性分子如:酶、抗体、细胞等固定在电极表面,从而制成各类生物传感器在化学、生物、临床诊断以及环境检测方面应用广泛。超氧化物歧化酶(superoxide dismutase,SOD)是生物体内普遍存在的一种金属酶。天然SOD保存的稳定性,与生物膜的亲和性,提取制备困难及抗原性等问题均是实际应用中的难点。用化学手段合成分子量小、稳定性高、半衰期长以及脂溶性好的具有相关结构的超氧化物歧化酶模型化合物(Modelcompound of Superoxide dismutase,MSOD)以克服SOD使用上的局限性。为理解SOD内在的热力学和动力学性质,对SOD电化学的研究逐渐引起人们的广泛关注,将SOD组装到金电极上可以定性和定量的研究其活性。因此在金电极上构建MSOD拟酶体系或将MSOD拟酶自组装到金电极上为SOD模拟研究提供了直接的电化学方法。
本论文合成了具有自组装功能的组氨酸衍生物,在金电极表面构建了含组氨酸的拟酶自组装体系和含苯并咪唑类的拟酶自组装体系。用电化学方法对上述修饰电极的结构和性质进行了研究,测定了它们对超氧阴离子自由基的歧化作用。主要内容如下:...
【英文摘要】
Biosensors can be fabricated through fixing the biologically active species (such as enzyme, antibody, cell etc.) to the surface of electrode by surface self-assembly monolayers (SAMs) technology. Their potential applications in the fields of chemistry, biology, clinic diagnestics as well as environmental monitoring have been proved. Superoxide dismutase (SOD) is a common metalloenzyme in organism. However, the direct ultilization of natural SOD have many problems such as stability, affinity with biological...