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A new gold nanosurface molecularly imprinted polymer spectral probe (AuNP-MIP) for the detection of 4-methylimidazole (MI) was synthesized by microwave irradiation, using AuNP as the nanosubstrate, the azo compound (AC) of MI as the template molecule and methacrylic acid (MAA) as the functional monomer. The probe was found to exhibit strong resonance Rayleigh scattering (RRS) effects and to specifically recognize AC. With the increase of MI concentration, the AC increased, the RRS energy transfer (RRS-ET) was enhanced, and the intensity of RRS signal at 370 nm decreased linearly. Accordingly, a new RRS-ET method was developed for the simple, sensitive and selective determination of MI, with the linear range of 0.0375–0.13125 μg/mL, and the detection limit of 0.0022 μg/mL MI. It was applied to analysis of MI in samples, with the recoveries of 91%–100% and relative standard deviations of 1.1%–8.5%. • A nanogold surface imprinted polymer was prepared by microwave method. • Gold nanoparticles-decorated molecularly imprinted polymers (AuNP-MIP) specifically recognized 4-Methylimidazole (MI). • A resonance Rayleigh scattering (RRS) analysis platform for trace MI was established. • The RRS platform has high sensitivity, high selectivity and high accuracy. [ABSTRACT FROM AUTHOR]

In 0.2 mol/L HCl–0.22 mol/L HNO 3 medium, trace Hg2+ catalyzed NaH 2 PO 2 reduction of HAuCl 4 to form gold nanoparticles (AuNPs), which exhibited a strong resonance Rayleigh scattering (RRS) effect at 370 nm. With increasing of [Hg2+], the RRS effect enhanced due to more AuNP generated from the catalytic reaction. Under the chosen conditions, the enhanced RRS intensity at 370 nm is linear to Hg2+ concentration in the range of 5.0–450 × 10−9 mol/L, with a detection limit of 0.1 nmol/L. This RRS method was applied for the determination of Hg in water samples, with high sensitivity and good selectivity, and its results were agreement with that of atomic fluorescence spectrometry. [ABSTRACT FROM AUTHOR]