Developing low‐cost and fast methods for on‐site analysis is a long‐sought goal of the wine industry, especially to detect excessive concentrations of naturally occurring compounds such as polyphenols and pesticide residues. In this paper, we report on the treatment of screen‐printed electrodes, which were capable of detecting the flavonoid quercetin and the pesticide carbendazim simultaneously in wine samples with limits of detection of 51.8×10⁻⁹ mol L⁻¹ and 60×10⁻⁹ mol L⁻¹, respectively. Furthermore, no significant interference was observed with electroactive substances that can co‐exist in wine. We found that the electrochemical pretreatment in Na₂CO₃ solution eliminated residues and impurities from homemade carbon ink comprising graphite and alkyd resin eventually deposited on the electrodes, which were characterized by combining scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. These findings pave the way for monitoring multiple analytes with screen‐printed electrodes, which could be extended to clinical biomarkers.

中文翻译：

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使用一次性电化学传感器同时检测葡萄酒样品中的槲皮素和多菌灵

开发低成本，快速的现场分析方法是葡萄酒行业的长期目标，尤其是要检测浓度过高的天然化合物（例如多酚和农药残留）。在本文中，我们报道了在治疗丝网印刷电极的，这是能够检测的类黄酮和槲皮素同时农药多菌灵酒样中检测的51.8×10的范围^-9 摩尔大号^-1和60×10 ^{- 9} 摩尔大号^-1，分别。此外，未观察到可以在葡萄酒中共存的电活性物质的显着干扰。我们发现Na ₂ CO ₃中的电化学预处理该溶液消除了最终沉积在电极上的自制石墨油墨（包括石墨和醇酸树脂）中的残留物和杂质，其特征在于结合了扫描电子显微镜，循环伏安法和电化学阻抗谱。这些发现为使用丝网印刷电极监测多种分析物铺平了道路，可将其扩展到临床生物标志物。