Nanostructured zinc oxide platform for mycotoxin detection

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• 作者：Anees A. Ansari ; Ajeet Kaushik ; Pratima R. Solanki ; B.D. Malhotra
• 关键词：Sol– ; gel ; Zinc oxide ; Impedimetric immunosensor ; Mycotoxin ; Ochratoxin-A
• 刊名：Bioelectrochemistry
• 出版年：2010
• 出版时间：February 2010
• 年：2010
• 卷：77
• 期：2
• 页码：75-81
• 全文大小：1198 K

文摘

Nanostructured zinc oxide (Nano-ZnO) film has been deposited onto indium–tin–oxide (ITO) glass plate for co-immobilization of rabbit-immunoglubin antibodies (r-IgGs) and bovine serum albumin (BSA) for ochratoxin-A (OTA) detection. The results of X-ray diffraction (XRD) studies reveal the formation of Nano-ZnO with average particle size as ~5.0 nm. Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) techniques have been used to characterize Nano-ZnO/ITO electrode and BSA/r-IgGs/Nano-ZnO/ITO immunoelectrode. Electrochemical impedimetric response of BSA/r-IgGs/Nano-ZnO/ITO immunoelectrode obtained as a function of OTA concentration exhibits linearity as 0.006–0.01 nM/dm³, detection limit of 0.006 nM/dm³, response time as 25 s and sensitivity of 189 Ω/nM/dm³cm^− 2 with a regression coefficient of 0.997.