Importance of the surface chemistry of nanoparticles on peroxidase-like activity
| Autor: | Wenyi Zheng, Radwa M. Ashour, Ramy El-Sayed, Heba Asem, Fei Ye, Mamoun Muhammed, Moustapha Hassan |
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| Rok vydání: | 2017 |
| Předmět: |
Solid-state chemistry
Surface Properties Inorganic chemistry Biophysics Metal Nanoparticles Nanoparticle 02 engineering and technology 010402 general chemistry 01 natural sciences Biochemistry Substrate Specificity Catalysis Materials Testing Surface charge Particle Size Molecular Biology Peroxidase Chemistry Benzidines Substrate (chemistry) Hydrogen Peroxide Cell Biology 021001 nanoscience & nanotechnology 0104 chemical sciences Enzyme Activation Chemical engineering Colloidal gold Enzyme mimic Nanorod Gold 0210 nano-technology Oxidation-Reduction |
| Zdroj: | Biochemical and Biophysical Research Communications. 491:15-18 |
| ISSN: | 0006-291X |
| DOI: | 10.1016/j.bbrc.2017.07.014 |
| Popis: | We report the studies on origin of peroxidase-like activity for gold nanoparticles, as well as the impact from morphology and surface charge of nanoparticles. For this purpose, we have synthesized hollow gold nanospheres (HAuNS) and gold nanorods (AuNR) with different morphology and surface chemistry to investigate their influence on the catalytic activity. We found that citrate-capped HAuNS show catalyzing efficiency in oxidation reaction of 3,3',5,5'-tetramethylbenzidine (TMB) by hydrogen peroxide (H2O2) and it is superior to that of cetyltrimethylammonium bromide (CTAB)-capped AuNR. The kinetics of catalytic activities from HAuNS and AuNR were respectively studied under varied temperatures. The results indicated that surface chemistry rather than morphology of nanoparticles plays an important role in the catalytic reaction of substrate. Furthermore, influencing factors such as pH, amount of nanoparticle and H2O2 concentration were also investigated on HAuNS-catalyzed system. The great impact of nanoparticle surface properties on catalytic reactions makes a paradigm in constructing nanozymes as peroxidase mimic for sensing application. |
| Databáze: | OpenAIRE |
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