Colorimetric detection of l-Dopa via anti-etching of Au nanorods catalyzed by an MIL-88A (Fe)-TMB system

, converting AuNRs into spherical AuNPs and causing a distinct blue shift in the plasmonic peak. However, in the presence of L-Dopa, the oxidation of TMB is suppressed, thereby preserving the shape and optical properties of AuNRs. This colorimetric method is simple, rapid, and cost-effective, and shows great promise for non-invasive L-Dopa monitoring in clinical and diagnostic applications.