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Flexible Polyester Screen‐printed Electrode Modified with Carbon Nanofibers for the Electrochemical Aptasensing of Cadmium (II)
Electroanalysis ( IF 3 ) Pub Date : 2020-06-23 , DOI: 10.1002/elan.202060070
Colani T Fakude 1 , Omotayo A Arotiba 1, 2 , Fabiana Arduini 3 , Nonhlangabezo Mabuba 1, 2
Affiliation  

An aptasensor was prepared by immobilising a biotinylated aptamer selected for Cd(II) on an activated carbon nanofiber (CNF) and streptavidin modified a screen‐printed electrode. The acid activated CNF was characterised by FTIR, CHNS elemental analysis and electron microscopy. Cyclic voltammetry, square wave voltammetry and electrochemical impedance spectroscopy (EIS) were used to characterise each step in the aptasensor preparation electrochemically. A detection limit of 0.11 ppb and a linear range of 2–100 ppb were obtained for Cd(II) with tolerance for other interfering species. The aptasensor was applied in real water samples and validated with ICPOES.

中文翻译:

碳纳米纤维修饰的柔性聚酯丝网印刷电极,用于镉(II)的电化学吸附

通过将选择用于Cd(II)的生物素化适体固定在活性炭纳米纤维(CNF)上,并用链霉亲和素修饰丝网印刷电极,来制备适体传感器。通过FTIR,CHNS元素分析和电子显微镜对酸活化的CNF进行了表征。循环伏安法,方波伏安法和电化学阻抗谱法(EIS)用于电化学表征适体传感器制备中的每个步骤。Cd(II)的检出限为0.11 ppb,线性范围为2-100 ppb,对其他干扰物质具有耐受性。将适体传感器应用于真实水样中,并通过ICPOES进行验证。
更新日期:2020-06-23
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