A new SERS quantitative analysis method for trace malathion with recognition and catalytic amplification difunctional MOFTb@Au@MIP nanoprobe

• Published in: Talanta (Oxford) 2024-01, Vol.267, p.125166-125166, Article 125166
• Main Authors: Shu, Yiyi, Li, Jingjing, Bai, Hongyan, Liang, Aihui, Wen, Guiqing, Jiang, Zhiliang
• Format: Article
• Language: English
• Subjects: Bifunctional nanosurface molecularly imprinted polymers; MAL; Metal-organic frameworks loaded nanogold; SERS quantitative method
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2023.125166

New multifunctional nanomaterial preparation and its application to trace pollutant analysis are interesting to peoples. Using terbium metal-organic framework loaded gold nanoparticles (MOFTb@Au) as the nanosubstrate and 3-aminopropyltriethoxysilane (APTES) as the functional monomer, a new bifunctional nanosurface molecularly imprinted polymer nanoprobe of MOFTb@Au@MIP with strongly recognition and catalytic amplification functions was prepared by the microwave sol-gel procedure. It was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier infrared spectroscopy (FTIR) and other techniques. The nanoprobe was found to specifically recognize malathion (MAL) and catalyze the L-cysteine (Cys)-HAuCl4 nanogold indicator reaction to amplify the molecular spectral signal. The gold nanoparticles (AuNPs) generated in the system show a strong surface-enhanced Raman scattering (SERS) effect, resonant Rayleigh scattering (RRS) peak and UV absorption (Abs) peak at 1615 cm−1, 370 nm and 520 nm, respectively. Based on this, a new SERS/RRS/Abs trimode method for the detection of MAL can be established. It has been applied to the analysis of cereal samples with satisfactory recoveries of 95.2–107.4% and precision of 3.76–9.06%. [Display omitted] •A new SMIP was synthesized with nanosubstrate of MOF@AuNP.•The SMIP has recognition and catalytic amplification difunction.•A new HAuCl4-cysteine-SMIP nanocatalytic indicator reaction was discovered.•A new SERS/RRS/Abs trimode analytical platform was developed to determine malathion.