Abstract
Alizarin complexone-modified gold nanoparticles (Au0-NPsALz) were synthesized using a proposed ultrasonic irradiation-assisted chemical reduction method. Ultrasonic irradiation powers, reaction time and alizarin complexone concentration had been proven to be the main parameters for controlling the nucleation and growth of Au0-NPsALz. In the synthesized ultrasonic irradiation-assisted chemical reduction conditions, Au0-NPsALz had a spherical oriented morphology with a uniform size of 17.84 ± 1.37 nm and are shiny red with a surface plasmon resonance (SPR) of 535 nm. A rapid colorimetric and fluorometric dual-mode detection strategy for selective detection of histamine in seafood was developed based on the self-assembly of Au0-NPsALz-Ni (II) complexes. Ni (II) can capture the histamine molecules close to Au0-NPsALz surfaces, making changes in the colorimetric and fluorometric responses of the solution. The quantitative analysis of histamine was realized through the variation of dual-signal colorimetric and fluorometric responses. Such Au0-NPsALz sensor offered good detection sensitivity for histamine with a detection limit (LOD) of 59.32 μmol L−1 and 116.20 μmol L−1 and wide linear response within the range of 10–10000 μmol L−1 (R2 = 0.9952) and 100–5000 μmol L−1 (R2 = 0.9947) for colorimetric and fluorometric measurement, respectively. Recoveries ranging from 94.99 to 103.29 % and 97.67–106.88 % for colorimetric and fluorometric assay were obtained, showing low levels of matrix effects. Particularly, the results of the dual-mode sensor were also validated by comparing with the HPLC method for improving the assay accuracy and dependability. Ultimately, the developed Au0-NPsALz colorimetric and fluorometric probe performs excellently in practical applications, with promising results for detecting histamine in seafood products.
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