An epitope imprinted electrochemical sensor for highly sensitive and selective determination of prostate-specific antigen

IF 5.3 2区化学 Q1 CHEMISTRY, ANALYTICAL

Microchimica Acta Pub Date : 2024-10-10 DOI:10.1007/s00604-024-06737-y

Huikai Shao, Lingguo Zhao, Zhenping Liu, Jinqi Li

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Abstract

A simple method for highly selective and sensitive prostate-specific antigen (PSA) detection using a molecularly imprinted electrochemical sensor is presented. The sensor was developed through an epitope imprinted strategy combined with electrochemical measurement techniques. An epitope molecularly imprinted polymer (EMIP) film was constructed on a AuNPs-coated gold electrode surface through electropolymerization, utilizing the C-terminus epitope of PSA (KWIKDTIVANP) as the template molecular and o-phenylenediamine as the functional monomer. The characteristics of EMIP film were investigated by using a scanning electron microscope and electrochemical test methods, including electrochemical impedance spectroscopy and cyclic voltammetry. Key parameters such as electropolymerization cycles, elution and rebinding times, and the molar ratio of template molecular to functional monomer were systematically optimized. The sensor demonstrated a detection limit (LOD) of 0.31 fg/mL and exhibited an excellent linear response towards PSA concentration ranging from 1.0 fg/mL to 0.1 µg/mL. Furthermore, the EMIP sensor showed excellent selectivity against other biological macromolecules, such as bovine serum albumin, human serum albumin, alpha-fetoprotein, and carcinoembryonic antigen. With recoveries between 95.89 and 106.04% for PSA detection in human serums the EMIP/AuNPs/AuE electrochemical sensor showed great potential in real sample analysis.

Graphical Abstract

Abstract Image

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用于高灵敏度和选择性测定前列腺特异性抗原的表位印迹电化学传感器。

本文介绍了一种利用分子印迹电化学传感器高选择性、高灵敏度检测前列腺特异性抗原（PSA）的简单方法。该传感器是通过表位印迹策略与电化学测量技术相结合而开发的。以 PSA 的 C 端表位（KWIKDTIVANP）为模板分子，邻苯二胺为功能单体，通过电聚合作用在涂有 AuNPs 的金电极表面构建了表位分子印迹聚合物（EMIP）膜。利用扫描电子显微镜和电化学测试方法（包括电化学阻抗光谱法和循环伏安法）研究了 EMIP 薄膜的特性。系统优化了电聚合周期、洗脱和再结合时间以及模板分子与功能单体的摩尔比等关键参数。该传感器的检测限（LOD）为 0.31 fg/mL，对 1.0 fg/mL 至 0.1 µg/mL 的 PSA 浓度具有良好的线性响应。此外，EMIP 传感器还对其他生物大分子，如牛血清白蛋白、人血清白蛋白、甲胎蛋白和癌胚抗原具有极佳的选择性。EMIP/AuNPs/AuE 电化学传感器对人体血清中 PSA 的检测回收率在 95.89% 和 106.04% 之间，在实际样品分析中显示出巨大的潜力。

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来源期刊

Microchimica Acta 化学-分析化学

CiteScore

9.80

自引率

5.30%

发文量

410

审稿时长

2.7 months

期刊介绍： As a peer-reviewed journal for analytical sciences and technologies on the micro- and nanoscale, Microchimica Acta has established itself as a premier forum for truly novel approaches in chemical and biochemical analysis. Coverage includes methods and devices that provide expedient solutions to the most contemporary demands in this area. Examples are point-of-care technologies, wearable (bio)sensors, in-vivo-monitoring, micro/nanomotors and materials based on synthetic biology as well as biomedical imaging and targeting.