Fabrication of Metal-Substituted Polyoxometalates for Colorimetric Detection of Dopamine and Ractopamine.

ABSTRACT: A novel colorimetric detection method based on the peroxidase-like activity of metal-substituted polyoxometalates (POMs) of SiW?M? (M = Co²⁺, Fe³⁺, Cu²⁺, Mn²⁺) has been established. POMs can catalyze oxidation of dopamine (DA) and ractopamine (RAC) by H?O? in aqueous solutions. SiW?Co?-based POMs detect DA at concentrations as low as 5.38 × 10⁻⁶ mol·L⁻¹ simply by observation of the color change from colorless to orange using the naked eye. RAC is detected by observing the change from colorless to slight red by SiW?Cu? with a detection limit of 7.94 × 10⁻⁵ mol·L⁻¹. This study shows that colorimetric DA and RAC detection using SiW?Co? and SiW?Cu? is highly selective and sensitive as well as visually observable.

SUBMITTER: Duan X 

PROVIDER: S-EPMC5978051 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature