Babakhanian Arash, Momeneh Tahereh, Aberoomand-azar Parviz, Kaki Samineh, Torki Mehran, Hossein Kiaie Seyed, Sadeghi Ehsan, Dabirian Farzad
Department of Chemistry, College of Science, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran.
Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Analyst. 2015 Nov 21;140(22):7761-7. doi: 10.1039/c5an01602a.
The aim of this work was to fabricate a novel nano-fiber modified electrode, involving Lake Red C (LRC) pigments doped into electrospun polyacrylonitrile (PAN) fibrous films. Cyclic voltammetry (CV), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV) techniques were used for electrochemical and morphological characterization of the composite fibers. This sensor responds to Aflatoxin B1 (AFB1) over the concentration range of 40-120 nM with high accuracy and precision in analysis. The modified electrode exhibited an excellent electrocatalytic ability (α = 0.42, log K(s) = 4.21 s(-1), and Γ = 1.49 × 10(-5) mmol cm(-2)) for reduction of AFB1 at the optimum pH of 6 and working potential of -0.75 V (vs. SCE). The common substances accompanying AFB1 had no serious interferences on the response of the modified electrode to AFB1. The modified electrode indicated reproducible behavior and a high level stability during the experiments, making it particularly suitable for the analytical determination of AFB1 in poultry feed and serum samples.
这项工作的目的是制备一种新型的纳米纤维修饰电极，即将湖红C（LRC）颜料掺杂到电纺聚丙烯腈（PAN）纤维膜中。采用循环伏安法（CV）、扫描电子显微镜（SEM）、电化学阻抗谱（EIS）和差分脉冲伏安法（DPV）技术对复合纤维进行电化学和形态表征。该传感器在40 - 120 nM的浓度范围内对黄曲霉毒素B1（AFB1）有响应，分析时具有高精度和高准确度。在最佳pH为6和工作电位为 -0.75 V（相对于饱和甘汞电极）的条件下，修饰电极对AFB1的还原表现出优异的电催化能力（α = 0.42，log K(s) = 4.21 s(-1)以及Γ = 1.49×10(-5) mmol cm(-2)）。伴随AFB1的常见物质对修饰电极对AFB1的响应没有严重干扰。修饰电极在实验过程中表现出可重复的行为和高度稳定性，使其特别适用于家禽饲料和血清样品中AFB1的分析测定。
