Triple-enzyme Mimetic Activity of FeO@C@MnO Composites Derived from Metal-organic Frameworks and Their Application to Colorimetric Biosensing of Dopamine
Overview
Chemistry
Affiliations
Novel FeO@C@MnO composites were successfully synthesized for the first time via an interfacial reaction between magnetic porous carbon and KMnO, in which the magnetic porous carbon was derived from the pyrolysis of Fe-MIL-88A under N atmosphere. Interestingly, the obtained FeO@C@MnO composites were found to have triple-enzyme mimetic activity including peroxidase-like, catalase-like, and oxidase-like activity. As a peroxidase mimic, FeO@C@MnO composites could catalyze the oxidation of TMB into a blue oxidized product by HO. As a catalase mimic, FeO@C@MnO could catalyze the decomposition of HO to generate O and HO. As an oxidase mimic, FeO@C@MnO could catalyze the direct oxidation of TMB to produce a blue oxidized product without HO. Reactive oxygen species measurements revealed that the oxidase-like activity originated from O and O∙and little∙OH generated by the dissolved oxygen, which was catalyzed by the FeO@C@MnO in the TMB oxidation reaction. The oxidase-like activity of FeO@C@MnO was investigated in detail. Under the optimized conditions, a rapid, sensitive, visual colorimetric method for dopamine detection was developed based on the inhibitory effect of dopamine on the oxidase-like activity. The proposed method allows for dopamine detection with a limit of detection of 0.034 μM and a linear range of 0.125-10 μM. This new colorimetric method was successfully used for the determination of dopamine in human blood samples.
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