期刊
MICROCHIMICA ACTA
卷 184, 期 7, 页码 2445-2453出版社
SPRINGER WIEN
DOI: 10.1007/s00604-017-2223-2
关键词
Ochratoxin A; Competitive immunosensor; Ferrocene; Enzyme mimic; Cyclic voltammetry; Foodsafety; AuPtnanoparticles; Platinum enhanced process; Redox cycling; Catalytic strategy
资金
- National Natural Science Foundation of China [21505060]
- Foundation of Jiangxi Educational Committee [GJJ150327]
- Science Foundation of Jiangxi Province [20161BAB213073]
- Scientific Research Foundation of Jiangxi Normal University
A new signal amplified protocol for sensitive monitor of ochratoxin A was developed by coupling platinum enhancement technique to a redox cycling amplification strategy. Initially, platinum-enclosed gold cores (AuPtNP) were functionalized with monoconal antibody against ochratoxin A (OTA) to act as signal tags. Upon addition of analyte (OTA), competitive immunobinding occurs between OTA and an OTA-BSA conjugate immobilized on a ferrocene modified electrode for the anti-OTA on the signal tags. Next, the AuPtNPs on the immunosensor are incubated with a platinum enhancing solution to initiate the growth of additional catalysts in order to further promote the catalytic cycling between p-aminophenol and p-quinoneimine with the aid of the reductant NaBH4 and ferrocene. As a result, the analytical signal is strongly enhanced and can be measured by differential pulse voltammetry in the range from -300 mV to 600 mV (vs. SCE) at 50 mV s(-1). Under optimized conditions, the immunosensor displays a dynamic working range that extends from 0.2 pgai...mL(-1) to 5 ngai...mL(-1) of OTA, with a lower detection limit of 75 fgai...mL(-1). The method is highly selective and was applied to the determination of OTA in (spiked) red wine samples.
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