Abstract A dual-ratiometric electrochemical sensor was constructed for propyl gallate (PG) detection based on anthraquinone/multi-walled carbon nanotube/chitosan modified glassy carbon electrode (AQ/MWCNT/CS/GCE). In the presence of the analyte PG, the AQ/MWCNT/CS/GCE displays three current peaks at different potentials, which are respectively related to the electro-oxidation of PG, AQ, and MWCNT. Anthraquinone and multi-walled carbon nanotube can be then used as inner reference electroactive probes. It was demonstrated that the modification of the GCE with AQ, MWCNT and chitosan can enhance the electrochemical signal of PG, leading to the improvement in sensitivity of PG detection. Two ratiometric signals, namely, IPG/IAQ and IPG/IMWCNT, linearly increase with the increasing concentration of PG over the range of 1.0 to 30.0 μM, and the detection limit for PG detection are respectively estimated to be 0.67 μM and 0.76 μM. The electrochemical sensor can be applied for PG detection in edible oil samples with satisfactory results.

中文翻译：

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用于检测没食子酸丙酯的双比例电化学传感器

摘要 基于蒽醌/多壁碳纳米管/壳聚糖修饰的玻碳电极（AQ/MWCNT/CS/GCE），构建了一种用于检测没食子酸丙酯（PG）的双比例电化学传感器。在分析物 PG 存在下，AQ/MWCNT/CS/GCE 在不同电位下显示三个电流峰，分别与 PG、AQ 和 MWCNT 的电氧化有关。然后可以将蒽醌和多壁碳纳米管用作内部参考电活性探针。结果表明，用 AQ、MWCNT 和壳聚糖修饰 GCE 可以增强 PG 的电化学信号，从而提高 PG 检测的灵敏度。两个比例信号，即 IPG/IAQ 和 IPG/IMWCNT，在 1.0 到 30.0 μM 的范围内随着 PG 浓度的增加而线性增加，PG 检测的检测限分别估计为 0.67 μM 和 0.76 μM。该电化学传感器可用于食用油样品中的PG检测，结​​果令人满意。