Department of Chemical Engineering, National Institute of Technology, Surathkal, Karnataka, 575025, India.
Environ Sci Pollut Res Int. 2021 Mar;28(10):11882-11892. doi: 10.1007/s11356-020-07797-2. Epub 2020 Jan 28.
The estrogenic property of bisphenol A (BPA) leads to potential adverse health and ecological effects. A simple, selective, and cost-effective sensor capable of detecting BPA would have a noteworthy relevance for the environmental system. The present work illustrates the synthesis and characterization of β-cyclodextrin (β-CD) functionalized zinc oxide (ZnO) quantum dots (QDs) for the selective detection of BPA. BPA has a fluorescence quenching effect on functionalized ZnO QDs, and the decrease in fluorescence intensity is associated with the BPA concentration between 2 and 10 μM. Under the optimum reaction condition, a good linear correlation was obtained between relative fluorescence-quenching intensity of β-cyclodextrin-functionalized ZnO QDs and BPA concentration (R = 0.9891). The lower detection limit of functionalized QDs for BPA was estimated to be 0.19 μM, which is lower than the toxic limits in aquatic biota. The fluorescence-based detection of BPA may be ascribed to the electron transfer mechanism, which is elucidated with scientific details from the literature.
双酚 A（BPA）具有雌激素性质，可能对健康和生态产生潜在不良影响。能够检测 BPA 的简单、选择性和具有成本效益的传感器将与环境系统具有显著的相关性。本工作说明了β-环糊精（β-CD）功能化氧化锌（ZnO）量子点（QD）的合成与表征，用于选择性检测 BPA。BPA 对功能化 ZnO QD 具有荧光猝灭作用，荧光强度的降低与 2 至 10 μM 之间的 BPA 浓度有关。在最佳反应条件下，β-环糊精功能化 ZnO QD 的相对荧光猝灭强度与 BPA 浓度之间呈良好的线性关系（R = 0.9891）。功能化 QD 对 BPA 的检测下限估计为 0.19 μM，低于水生生物的毒性极限。BPA 的荧光检测可能归因于电子转移机制，这从文献中详细阐明了科学细节。
