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A self-assembled electrochemical immunosensor for ultra-sensitive detection of ochratoxin A in medicinal and edible malt.
Food Chemistry ( IF 8.8 ) Pub Date : 2020-01-27 , DOI: 10.1016/j.foodchem.2020.126289
Chaonan Sun 1 , Xiaofang Liao 1 , Pinxuan Huang 1 , Guangzhi Shan 2 , Xiao Ma 3 , Lizhu Fu 3 , Lidong Zhou 1 , Weijun Kong 1
Affiliation  

Trace residue of mycotoxins in complex medicinal and edible food matrices has brought huge challenges for the development of ultrasensitive analytical methods. Here, a green electrochemical immunosensor for the ultrasensitive detection of ochratoxin A (OTA) was fabricated by self-assembling a compact 2-mercaptoacetic (TGA) monolayer on the surface of the working Au electrode to form the Au/TGA/bovine serum aibumin (BSA)-OTA/anti-OTA monoclonal antibody composite probes for selective and ultra-sensitive detection of OTA based on indirect competitive principle and differential pulse voltammetry analysis. The electrochemical impedance spectroscopy and cyclic voltammetry methods were introduced to characterize the assemble situation of the TGA-modified Au electrode and optimize some critical parameters for the green electrochemical immunoseonsor. Under the optimal conditions, the developed immunosensor exhibited much lower limit of detection (0.08 ng/mL) in the range of 0.1-1.0 ng/mL for OTA compared with other direct or disposable electrochemical immunosensors. Real application in the spiked malt samples verified high accuracy with no matrix interferences of the proposed immunoseonsor. This is a meaningful study on a self-assembled electrochemical immunoseonsor for ultra-sensitive and rapid detection of OTA in malt samples, which suggested a general simple-to-use sensing platform and prospect as an economical and green tool for ultra-sensitive detection of much more trace-level of toxic small molecules in other complex matrices to ensure their quality and safety.

中文翻译:

一种自组装的电化学免疫传感器,用于超灵敏检测药用和食用麦芽中的ra曲霉毒素A。

复杂的药用和食用食品基质中的微量真菌毒素残留物为超灵敏分析方法的发展带来了巨大挑战。在这里,绿色的电化学免疫传感器用于曲霉毒素A(OTA)的超灵敏检测,方法是在工作的Au电极表面上自组装紧密的2-巯基乙酸(TGA)单层以形成Au / TGA /牛血清白蛋白(Abuumin)(基于间接竞争原理和差分脉冲伏安法的OSA选择性和超灵敏检测的BSA)-OTA /抗OTA单克隆抗体复合探针。引入电化学阻抗谱和循环伏安法表征了TGA修饰的Au电极的组装情况,并优化了绿色电化学免疫传感器的一些关键参数。在最佳条件下,与其他直接或一次性电化学免疫传感器相比,开发的免疫传感器对OTA的检测下限(0.08 ng / mL)低得多,为0.1-1.0 ng / mL。在加标的麦芽样品中的实际应用证明了所提出的免疫传感器没有基质干扰的高精度。这是对自组装电化学免疫传感器进行麦芽样品中OTA的超灵敏和快速检测的有意义的研究,它提出了一个通用的易于使用的传感平台,并有望成为一种经济,绿色的超灵敏检测方法。在其他复杂基质中含有更多痕量的有毒小分子,以确保其质量和安全性。与其他直接或一次性电化学免疫传感器相比,OTA的浓度为0 ng / mL。在加标的麦芽样品中的实际应用证明了所提出的免疫传感器没有基质干扰的高精度。这是对自组装电化学免疫传感器进行麦芽样品中OTA的超灵敏和快速检测的有意义的研究,它提出了一个通用的易于使用的传感平台,并有望成为一种经济,绿色的超灵敏检测方法。在其他复杂基质中含有更多痕量的有毒小分子,以确保其质量和安全性。与其他直接或一次性电化学免疫传感器相比,OTA的浓度为0 ng / mL。在加标的麦芽样品中的实际应用证明了所提出的免疫传感器没有基质干扰的高精度。这是对自组装电化学免疫传感器进行麦芽样品中OTA的超灵敏和快速检测的有意义的研究,它提出了一个通用的易于使用的传感平台,并有望成为一种经济,绿色的超灵敏检测方法。在其他复杂基质中含有更多痕量的有毒小分子,以确保其质量和安全性。
更新日期:2020-01-27
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