Fluorescent polydopamine nanoparticles as a nanosensor for the sequential detection of mercury ions and l-ascorbic acid based on a coordination effect and redox reaction.

ABSTRACT: Herein, a novel fluorescence nanosensor using intrinsic fluorescent polydopamine nanoparticles (PDA NPs) as an effective signal reporter has been constructed for the simple, rapid and sequential detection of mercury ions (Hg²⁺) and l-ascorbic acid (AA) based on a coordination effect and redox reaction. The fluorescence of the PDA NPs could be specifically quenched by Hg²⁺ through intense coordination effects between the Hg²⁺ and the groups (catechol, amine, ketone and imine) on the surface of the PDA NPs. However, when AA and Hg²⁺ coexisted in solution, the fluorescence of the PDA NPs pronouncedly recovered via the redox reaction of Hg²⁺, with it being reduced to Hg⁰ by AA. The fluorescence quenching mechanism of Hg

SUBMITTER: Yang YX 

PROVIDER: S-EPMC9055638 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature