Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 258, Issue -, Pages 80-87Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.11.094
Keywords
Manganese oxides; Branched polyethyleneimine; Oxidase-like; Glutathione
Funding
- National Natural Science Foundation of China, PR China [21075099]
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Different manganese oxides materials with various crystalline structures were prepared from KMnO4 by using a cationic polymer branched polyethyleneimine (BPEI) as the reducing agent and structure directing agent through a hydrothermal process. By varying BPEI concentration, wire-like MnO2, rod-like MnOOH/Mn3O4 and octahedral-like Mn3O4 nanoparticles were controllably synthesized, respectively. The as-prepared manganese oxides were characterized by XRD, FT-IR, TEM, SEM and nitrogen adsorption desorption measurements. The intrinsic enzyme-like activity of the synthesized manganese oxides was evaluated by using 3,3',5,5'-tetramethylbenzidine (TMB) as the substrate in the absence of H2O2. It was shown that the mesoporous wire-like MnO2 was best-performing with a highly oxidase-like catalytic activity in the model reaction. The effect of synthetic conditions of mesoporous wire-like MnO2 on its oxidase-like activity was further investigated. Based on the selective inhibition of glutathione (GSH) on the high oxidase-like activity of as-prepared MnO2, a selective and sensitive colorimetric assay for GSH has been established. The limit of detection (LOD) for GSH was as low as 0.11 mu M and the developed method was successfully applied to the detection of GSH in human serum samples. (c) 2017 Elsevier B.V. All rights reserved.
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