基于聚苯胺衍生物的腫瘤標(biāo)志物電化學(xué)檢測(cè)
[Abstract]:Polyaniline and its derivatives provide an excellent sensing platform for electrochemical biosensors and other chemical sensors due to their unique optical and electrical properties. Based on polymercaptoaniline, poly (o-phenylenediamine / gold), poly (vinylferrocene-o-mercaptoaniline) / gold, the electrochemical immunosensor interface of carcinoembryonic antigen (CEA) was constructed based on poly (o-mercaptoaniline). Using poly (o-phenylenediamine / gold) and poly (vinyl ferrocene-o-mercaptoaniline) / gold as electrochemical active substances, the double target tumor markers (CEA) and alpha-fetoprotein (AFP) electrochemical immunosensors were constructed. In addition, the colorimetric detection system of cobalt ion was prepared by using the special interaction between o-mercaptoaniline and methylene blue (MB), Cu2. Obtained the following research results: 1. A multi-mercapto conjugated polymer, poly (o-mercaptoaniline) (PATP), was synthesized by chemical oxidation. Its molecular chain consists of 25 repeating units. A sensitive, unlabeled CEA electrochemical immunosensor interface was constructed by using this conductive long chain polymercapto polymer as substrate material and gold nanoparticles were adsorbed by Au-S bond. In the process of CEA detection, PATP has good electron transfer ability, and the stability of the sensing interface is improved by the strong interaction between the multiple sulfhydryl groups and gold in the molecular chain. Under the optimum conditions, the sensor has the characteristics of wide linear range (1fg mL-1-10ng mL-1), low detection limit (0.015fg mL-1) and high sensitivity. The results of the detection of serum samples by the sensor were in agreement with the results of enzyme linked immunosorbent assay (Elisa). 2. Novel poly (o-phenylenediamine / gold (POPD/Au) and poly (vinyl ferrocene-o-mercaptoaniline) / gold (poly (VFc-ATP / Au) nanocomposites were synthesized by one-step method. The novel tumor marker probes were prepared by using the good biocompatibility, easy discrimination of peak potential, easy modification and preparation of the two nanocomposites, and the excellent electrochemical activity of POPD and poly (VFc-ATP). A double target electrochemical immunosensor was constructed, and the performance of the sensor was studied by using CEA and AFP as model detection objects. The detection limits of CEA and AFP are 0.006ng mL-1 and 0.003ng mL-1 (S/N=3), respectively. The results of detection of serum samples were consistent with those of enzyme linked immunosorbent assay (Elisa). 3. A new Co2 colorimetry system (MB-ATP-Cu2) was developed by using the interaction between (ATP) and Cu2 of MB, o-mercaptoaniline. By adjusting the concentration of Co2, the reduced MB can be oxidized to different degrees, the detection system presents different colors, and the visual detection of Co2 can be achieved. The detection range is 0.1mM-1.1 mMand the detection limit is 0.04mM.
【學(xué)位授予單位】:首都師范大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:R943;O657.1
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