The present work describes the evaluation of microfluidic electroanalytical devices constructed by a 3D printer using ABS (acrylonitrile butadiene styrene) polymer combined with cotton threads as microchannels. Screen-printed carbon electrodes (SPCEs) were used as electrochemical detector for amperometric determination of gallic and caffeic acid in wine samples. Using optimal experimental conditions (flow rate of 0.71 μL s−1, applied potential of +0.30 V and volume of injection of 2.0 μL) the proposed method presented a linear response for a concentration range of 5.0×10−6 to 1.0×10−3 mol L−1. The detection limits for gallic and caffeic acid were found to 1.5×10−6 mol L−1 and 8.0×10−7 mol L−1, respectively, with a sample throughput of 43 h−1. The achieved results are in agreement with those found using the official Folin-Ciocaulteu method.

中文翻译：

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基于棉线的 3D 打印微流体装置，用于葡萄酒样品中抗氧化剂的电流测量估计

目前的工作描述了使用 ABS（丙烯腈丁二烯苯乙烯）聚合物与棉线作为微通道相结合的 3D 打印机构建的微流体电分析装置的评估。丝网印刷碳电极 (SPCE) 用作电化学检测器，用于安培法测定葡萄酒样品中的没食子酸和咖啡酸。使用最佳实验条件（流速为 0.71 μL s-1，施加的电位为 +0.30 V，注射体积为 2.0 μL），所提出的方法在 5.0×10-6 至 1.0×10- 的浓度范围内呈现线性响应。 3摩尔L-1。发现没食子酸和咖啡酸的检测限分别为 1.5×10-6 mol L-1 和 8.0×10-7 mol L-1，样品通量为 43 h-1。取得的结果与使用官方 Folin-Ciocaulteu 方法发现的结果一致。