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基于分子印迹聚合物的石英晶体微天平传感器用于临床胰岛素检测。

Molecularly imprinted polymer based quartz crystal microbalance sensor for the clinical detection of insulin.

机构信息

Hacettepe University, Department of Chemistry, Beytepe, Ankara, Turkey.

Hacettepe University, Department of Chemistry, Beytepe, Ankara, Turkey.

出版信息

Mater Sci Eng C Mater Biol Appl. 2019 Apr;97:730-737. doi: 10.1016/j.msec.2018.12.086. Epub 2018 Dec 27.

Abstract

In this study, quartz crystal microbalance sensors based on molecular imprinting technology were fabricated for real-time detection of insulin in aqueous solution and artificial plasma. This study describes the preparation of insulin imprinted poly(hydroxyethyl methacrylate)-N-methacryloyl-(l)-histidine methyl ester based quartz crystal microbalance sensor for insulin determination. Poly(hydroxyethyl methacrylate)-N-methacryloyl-(l)-histidine methyl ester based film on chip surface was synthesized by ultra violet (UV) polymerization for the detection of insulin at low concentrations. At the first step, N-methacryloyl-(l)-histidine methyl ester complex was formed with insulin and then, the insulin imprinted film has been prepared. The characterization of the polymeric film has been conducted with ellipsometry, contact angle, Fourier transform infrared-attenuated total reflectance and atomic force microscopy measurements. Langmuir, Freundlich and Langmuir-Freundlich adsorption isotherm models were applied for this system. The best fitted model to explain the interactions between molecular imprinted chip and insulin molecules was the Langmuir adsorption isotherm (R: 0.999). The repeatability of insulin imprinted chip was investigated by using of equilibration-binding-regeneration cycles for four times. The detection limit was found as 0.00158 ng/mL. According to the results, the QCM sensor has showed low-detection limit, high selectivity and sensitivity for insulin assay.

摘要

在这项研究中,我们基于分子印迹技术制备了石英晶体微天平传感器,用于实时检测水溶液和人工血浆中的胰岛素。本研究描述了基于聚(羟乙基甲基丙烯酸酯)-N-甲基丙烯酰基-(L)-组氨酸甲酯的胰岛素印迹型石英晶体微天平传感器的制备,用于胰岛素的测定。通过紫外(UV)聚合在芯片表面合成聚(羟乙基甲基丙烯酸酯)-N-甲基丙烯酰基-(L)-组氨酸甲酯基膜,用于检测低浓度的胰岛素。在第一步中,形成胰岛素与 N-甲基丙烯酰基-(L)-组氨酸甲酯复合物,然后制备胰岛素印迹膜。采用椭偏仪、接触角、傅里叶变换衰减全反射和原子力显微镜测量对聚合物膜进行了表征。该系统应用了 Langmuir、Freundlich 和 Langmuir-Freundlich 吸附等温线模型。解释分子印迹芯片与胰岛素分子之间相互作用的最佳拟合模型是 Langmuir 吸附等温线(R:0.999)。通过使用平衡结合-再生循环四次,研究了胰岛素印迹芯片的重复性。检测限为 0.00158ng/mL。结果表明,该 QCM 传感器具有低检测限、高选择性和胰岛素检测的高灵敏度。

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