Hydrogen iron oxide from an Acinetobacterstrain exhibiting intrinsic peroxidase-like activity and its catalytic mechanism and applications

Autor: Abagana, Adam Yacoub, Zhao, Min, Alshahrani, Mohammad Y., Rehman, Khalil Ur, Andleeb, Shahla, Wang, Jueyu, Bukhari, Syed Mohsin
Zdroj: Biomass Conversion and Biorefinery; February 2024, Vol. 14 Issue: 3 p3453-3462, 10p
Abstrakt: Biogenic magnetic nano particles (BMNPs) are believed to outperform conventional MNPs; hence, in present study, BMNPs obtained from an Acinetobacterstrain isolated from the muddy waters of the Jiangbei River in Harbin, China, were characterized. The BMNP isolated was Fe0.96O0.88(OH)1.12and had a moderate size of 80 nm, as determined by transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The high coercive force of 147.61 Oe and low saturation and residual magnetic strength indicated that Fe0.96O0.88(OH)1.12exhibits crystal behavior. The experimental results confirmed that the Fe0.96O0.88(OH)1.12can catalyze the oxidation of the peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide (H2O2). Electron spin resonance (ESR) spectroscopy showed that the Fe0.96O0.88(OH)1.12induced H2O2to produce hydroxyl radicals (∙OH) in the presence of 5,5-dimethyl-1-pyrroline N-oxide(DMPO). While no reactions occurred with H2O2alone in the presence DMPO, the addition of Fe0.96O0.88(OH)1.12to this reaction system led to the production of ∙OH. The isolated Fe0.96O0.88(OH)1.12was used to detect H2O2and glucose and could catalyze the degradation of Congo red dye.
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