College of Biosystems Engineering and Food Science, State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou, China.
Zhejiang Provincial Key Laboratory of Fiber Materials and Manufacturing Technology, Zhejiang Sci-Tech University, Hangzhou, China.
Food Chem. 2023 Mar 30;405(Pt A):134806. doi: 10.1016/j.foodchem.2022.134806. Epub 2022 Nov 9.
Direct electrochemical analysis of bisphenol A (BPA) in alcoholic drinks without proper sample preparation is a major challenge. The current work reports a nanoporous electrode design with ultrathin polydimethylsiloxane (PDMS) coating grafted on the top of an indium tin oxide (ITO) electrode with silica nanochannels membrane and cetyltrimethylammonium bromide micelles (SNCM), using a facile contact heating step. The proposed PDMS@SNCM/ITO electrode was subjected to direct ultra-trace detection of BPA in the linear range of 1.0-100.0 µM and detection limit of 0.23 µM, under optimized pH 8 and an accumulation time of 9.0 min. The analytical utility of the proposed method was checked in real wine samples for BPA detection with successful recovery percentages in the range from 95.20 ± 8.53 to 96.22 ± 10.00. The intrinsic hydrophobic features, exceptional stability, and sensitivity of the proposed electrode show potential for food safety surveillance in complex food matrices.
未经适当样品制备直接电化学分析酒精饮料中的双酚 A (BPA) 是一项重大挑战。本工作报道了一种纳米多孔电极设计，在掺锡氧化铟 (ITO) 电极顶部采用具有二氧化硅纳米通道膜和十六烷基三甲基溴化铵胶束 (SNCM) 的超薄聚二甲基硅氧烷 (PDMS) 涂层，使用简便的接触加热步骤。在优化的 pH 值 8 和 9.0 分钟的积累时间下，所提出的 PDMS@SNCM/ITO 电极可在 1.0-100.0 µM 的线性范围内对 BPA 进行超痕量检测，检测限为 0.23 µM。该方法在实际葡萄酒样品中用于 BPA 检测的分析实用性得到了检验，BPA 的回收率在 95.20 ± 8.53 至 96.22 ± 10.00 范围内。所提出电极的固有疏水性、出色的稳定性和灵敏度表明其在复杂食品基质中的食品安全监测方面具有潜力。
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