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Electrochemical immunosensor for the determination of the cytokine interferon gamma (IFN-γ) in saliva.
Talanta ( IF 5.6 ) Pub Date : 2020-01-17 , DOI: 10.1016/j.talanta.2020.120761
E Sánchez-Tirado 1 , A González-Cortés 1 , P Yáñez-Sedeño 1 , J M Pingarrón 1
Affiliation  

A simple, fast and sensitive amperometric immunosensing method for the determination of the clinically relevant cytokine interferon gamma (IFN-γ) in saliva complying the requirements demanded for this kind of sample is reported. The target analyte was sandwiched between a specific capture antibody covalently immobilized on a screen-printed electrode functionalized by the diazonium salt grafting of p-aminobenzoic acid, and a biotinylated detector antibody labeled with a streptavidin-horseradish peroxidase conjugate. The amperometric responses measured at - 0.20 V vs Ag pseudo-reference electrode upon addition of hydrogen peroxide in the presence of hydroquinone as the redox mediator allowed a calibration plot with a linear range between 2.5 and 2000 pg mL-1 and a low limit of detection (1.6 pg mL-1) to be obtained. In addition, a good selectivity against other non-target proteins was achieved. The developed method was validated by analyzing a WHO 1st International Standard for IFN-γ. In addition, the immunosensor was used for the determination of the endogenous IFN-γ in saliva with results in excellent agreement with those obtained by a commercial ELISA kit.

中文翻译:

电化学免疫传感器,用于测定唾液中的细胞因子干扰素γ(IFN-γ)。

报道了一种简单,快速,灵敏的安培免疫传感方法,用于测定唾液中符合此类样品要求的临床相关细胞因子干扰素γ(IFN-γ)。将目标分析物夹在共价固定在通过对氨基苯甲酸的重氮盐接枝功能化的丝网印刷电极上的特异性捕获抗体与用链霉亲和素-辣根过氧化物酶缀合物标记的生物素化检测器抗体之间。在存在对苯二酚作为氧化还原介体的情况下,在加入过氧化氢的条件下,在相对于Ag伪参比电极-0.20 V的条件下测得的安培响应,可得到线性范围为2.5至2000 pg mL-1且检测限低的校准图得到(1.6 pg mL-1)。此外,获得了对其他非靶蛋白的良好选择性。通过分析WHO第一个IFN-γ国际标准验证了该开发方法。此外,该免疫传感器用于测定唾液中的内源性IFN-γ,其结果与通过商业ELISA试剂盒获得的结果非常吻合。
更新日期:2020-01-21
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