Pt nanoparticles dispersed in a metal-organic framework as peroxidase mimics for colorimetric detection of GSH

TL;DR

This paper reports the synthesis of Pt nanoparticles on ZIF-8 MOFs that mimic peroxidase activity, enabling a sensitive colorimetric detection method for glutathione based on catalytic oxidation of TMB.

Contribution

The study introduces a novel Pt@ZIF-8 nanocomposite with peroxidase-like activity for biomolecular detection, combining MOF support with noble metal catalysis.

Findings

Pt@ZIF-8 catalyzes TMB oxidation with H2O2 effectively.

The detection method for glutathione is highly sensitive.

The nanocomposite exhibits Michaelis-Menten kinetics.

Abstract

Metal-organic skeleton materials have been widely used in catalysis with their porous structure and adsorption properties. Precious metal nanoparticles have good catalytic properties. If the noble metal nanoparticles are adsorbed on the MOFs surface, the active sites can be increased and the catalytic effect of the materials can be greatly improved. We successfully synthesized Pt@ZIF-8 in two steps, the average particle size of Pt nanoparticles is about 3 nm. Pt@ZIF-8 possesses peroxidase activity and can oxidize colorless TMB to oxTMB in the presence of hydrogen peroxide. The peroxide-like nature of Pt@ZIF-8 is consistent with Michaelis-Menten kinetics. Glutathione is a reducing substance that reduces blue oxTMB to colorless oxTMB. This colorimetric method achieves a simple, sensitive and intuitive detection of glutathione. The detection limit of this experiment is low, which is promising in biomolecular detection.