高级检索

    基于分子印迹聚合物的SPR传感器用于牛血清蛋白的检测

    Molecularly Imprinted Polymers for Determination of Bovine Serum Albumin Based Surface Plasmon Resonance Sensor

    • 摘要: 以牛血清蛋白(BSA)为模板分子、多巴胺为功能单体和交联剂、高碘酸钠为氧化剂,制备了BSA表面印迹表面等离子共振(SPR)生物传感器。通过聚丙烯酸(PAA)与BSA的氢键作用预先固定BSA,增加印迹效率,同时在聚多巴胺表面非印迹区域修饰部分水解的聚(2-甲基-2-噁唑啉)(PMOXA-EI)抵抗蛋白质的非特异性吸附。通过X射线光电子能谱、原子力显微镜、可变角光谱椭偏仪和静态水接触角对制备的BSA表面印迹SPR生物传感器进行表征。对质量浓度为0.1~10 μg/mL的BSA水溶液进行SPR吸附研究,检测限和定量限分别达到了53 ng/mL和161 ng/mL。以β-乳球蛋白、卵白蛋白、溶菌酶和细胞色素C为参比蛋白进行选择性研究,相应的选择性系数分别达到了4.43、3.45、3.17和3.64。上述5种蛋白混合溶液中BSA的检测回收率为97.5%~102.5%。

       

      Abstract: Bovine serum albumin (BSA) molecularly imprinted polymer (MIP) surface plasmon resonance (SPR) biosensors were prepared using BSA as the model, dopamine as the functional monomer and cross-linker and sodium periodate as the oxidant. BSA molecules were fixed in advance through hydrogen bond via introducing poly(acrylic acid) (PAA) to increase recognition sites, and partially hydrolyzed poly(2-methyl-2-oxazoline)(PMOXA-EI) was also introduced into the noncavity regions of polydopamine to resist nonspecific adsorption of proteins. The prepared BSA-MIP SPR sensor was characterized by X-ray photoelectron spectroscopy, atomic force microscopy, variable angle spectroscopic ellipsometry, and static water contact angle. SPR adsorption studies were carried out in aqueous BSA solutions with the mass concentration of 0.1—10 μg/mL. The limit of detection and the limit of quantification values were obtained as 53 ng/mL and 161 ng/mL, respectively. Selectivity studies were performed against β-lactoglobulin, ovalbumin, lysozyme, and cytochrome C, and the corresponding selectivity coefficients were determined to be 4.43, 3.45, 3.17 and 3.64, respectively. Finally, BSA-MIP biosensor was used to detect BSA in the mixture solution of the above five proteins. The BSA recovery rate was 97.5%—102.5%.

       

    /

    返回文章
    返回