Fabrication of fluorescence sensor based on semi-covalent dummy molecularly imprinted silica on silane-modified carbon quantum dot for highly selective and sensitive detection of bisphenol A in spirits

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 696; p. 134292
• Main Authors: Wang, Zhiying, Sun, Xiaoli, Xu, Yalan, Yang, Luoxing, Wang, Muhua, Xia, Yueyi, Wang, Yan, Tang, Yu, Qiao, Chen, Lin, Yi
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.09.2024
• Subjects: Carbon quantum dot; Dummy template; Fluorescence sensor; Semi-covalent imprinting; Spirits; Spirits; Fluorescence sensor; Dummy template; Carbon quantum dot; Semi-covalent imprinting
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2024.134292

Spirits, a Chinese liquor, is susceptible to bisphenol A (BPA) contamination during production and storage. Therefore, developing an accurate and sensitive method for BPA detection in spirits samples is necessary. In this study, a fluorescence sensor (Si-CQDs@DMIPs) with a low detection limit for BPA was synthesized by combining semi-covalent dummy molecular imprinting and silane-modified carbon quantum dot (Si-CQD) techniques. The structure, morphology, and fluorescence properties of Si-CQDs@DMIPs were investigated using transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and fluorescence spectroscopy (FS). The principle of the selective recognition and detection of BPA by the prepared Si-CQDs@DMIPs is that the molecular imprinting layer can selectively capture BPA and quench the fluorescence intensity of Si-CQDs, due to the electron transfer from BPA to the Si-CQDs. Under optimal conditions, the fluorescence intensity of Si-CQDs@DMIPs sensor showed a good linear decrease (R2 > 0.99) when BPA concentration was 6–1800 nmol/L, and the detection limit was 0.65 nmol/L (3 σ/S). When applied to spirits samples, Si-CQDs@DMIPs exhibited recovery rates between 81.5% and 93.8% with relative standard deviations (RSDs, n = 5) of 3.0–5.8% (spiked at 50, 200, 500, and 1000 nmol/L). Overall, Si-CQDs@DMIPs enable the highly selective and sensitive direct measurement and rapid screening of BPA in spirits. [Display omitted]