Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 16, Pages 13989-13998Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b02459
Keywords
SiO2; CoO; GSH; Peroxidase; Biosensor
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Funding
- National Natural Science Foundation of China [21271119]
- Foundation of SDUST for Recruited Talents [2015RCJJ018, 2017RCJJ041, 2017RCJJ040]
- Natural Science Foundation of Shandong Province [ZR2018MEE003, ZR2018MB002, ZR2017BB008, ZR2018PEE006]
- Science and Technology Projects for Colleges and Universities in Shandong Province [J17KA097]
- Qingdao Postdoctoral Funding, Shandong Key Laboratory of Biochemical Analysis [SKLBA1909]
- Innovation Fund of SDUST Graduates [SDKDYC190216]
- [QUSTHX201904]
- [2014TDJH104]
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Si doped CoO nanorods (denoted as Si-CoO) were prepared by the hydrothermal method. The Si-CoO composites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and X-ray photoelectron spectra (XPS), etc. The results suggest that Si element uniformly distributed onto CoO nanorods with a diameter of 50-100 nm. The as prepared Si-CoO nanocomposite possessed an excellent peroxidase-like activity as well as quickly catalyzed the colorless substrate 3,3,5,5-tetramethylbenzidine (TMB) to be oxidized into blue oxTMB by H2O2 only in 20 s, which was easily visually observed. The electron spin resonance (ESR) data confirms that superoxide radicals (center dot O-2(-)) play a key function in catalytic reaction. On the basis of the peroxidase biomimetic activity of Si-CoO, we constructed a new biosensor for detection of H2O2 and reduced glutathione (GSH) in the range of 1-100 uM with a limit of 0.22 and 0.45 uM, respectively.
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