Remarkably Enhanced Luminol Chemiluminescence with Manganese Porphyrin-based Metal-Organic Framework for Sensitive Detection of Dopamine

The unique redox transition between Mn (III)-porphyrin and Mn(IV)-porphyrin centers confers exceptional catalytic properties to Mn-porphyrinic frameworks. In this study, we synthesized Mn-based metal-organic frameworks (Mn-MOFs) via a facile one-pot method using manganese (II) chloride tetrahydrate and 5,10,15,20-Tetrakis(4-carboxyphenyl)porphyrin (TCPP) as the ligand. The resulting Mn-MOFs exhibit unprecedented peroxidase-mimetic activity, enhancing luminol/H2O2 chemiluminescence (CL) by over 1200-fold. Capitalizing on the selective quenching effect of dopamine on the Mn-MOFs/luminol/H2O2 system, we developed a rapid CL analytical strategy with a linear detection range of 5–1000 nM and a detection limit of 3.95 nM (S/N = 3). Furthermore, this method was successfully applied for the quantitative determination of dopamine in serum samples, achieving a recovery rate of 98.3–104.4%. These findings highlight the potential of Mn-porphyrin-based MOFs as efficient catalysts in CL detection platforms, paving the way for their broader application in bioanalytical sensing.