Robust colorimetric detection based on the anti-aggregation of gold nanoparticles for bromide in rice samples.

ABSTRACT: Inorganic bromide (Br^-) is an important contaminant ion as it can originate from the overuse of illegal methyl bromide as a fumigant in stored rice samples. Herein, we developed a simple and highly sensitive colorimetric sensor for bromide ion detection in rice samples. The sensor is based on the anti-aggregation of gold nanoparticles (AuNPs) by Br^- in the presence of Cr³⁺, which made the method more selective than other typical aggregations of nanoparticles. The AuNPs underwent an aggregation process as a result of the coordination of Cr³⁺ and the carboxylate group of a citrate ion stabilized the AuNPs, resulting in a red-to-blue color change. When Br^- was pre-mixed with the AuNPs and Cr³⁺ was added, the solution color chan

SUBMITTER: Plaisen S 

PROVIDER: S-EPMC9080936 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature