Biocompatibility selenium nanoparticles with an intrinsic oxidase-like activity

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• 作者：Leilei Guo ; Kaixun Huang ; Hongmei Liu
• 关键词：Selenium nanoparticles ; Oxidase ; like ; TMB ; Biocompatibility ; Biomedicine
• 刊名：Journal of Nanoparticle Research
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：18
• 期：3
• 全文大小：1,532 KB
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• 作者单位：Leilei Guo (1)
  Kaixun Huang (1)
  Hongmei Liu (1)
  
  1. School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Nanotechnology
  Inorganic Chemistry
  Characterization and Evaluation Materials
  Physical Chemistry
  Applied Optics, Optoelectronics and Optical Devices
  
• 出版者：Springer Netherlands
• ISSN：1572-896X

文摘

Selenium nanoparticles (SeNPs) are considered to be the new selenium supplement forms with high biological activity and low toxicity; however, the molecular mechanism by which SeNPs exert the biological function is unclear. Here, we reported that biocompatibility SeNPs possessed intrinsic oxidase-like activity. Using Na₂SeO₃ as a precursor and glutathione as a reductant, biocompatibility SeNPs were synthesized by the wet chemical reduction method in the presence of bovine serum albumin (BSA). The results of structure characterization revealed that synthesized SeNPs were amorphous red elementary selenium with spherical morphology, and ranged in size from 25 to 70 nm size with a narrow distribution (41.4 ± 6.7 nm). The oxidase-like activity of the as-synthesized SeNPs was tested with 3,3′,5,5′-tetramethylbenzidine (TMB) as a substrate. The results indicated that SeNPs could catalyze the oxidization of TMB by dissolved oxygen. These SeNPs showed an optimum catalytic activity at pH 4 and 30 °C, and the oxidase-like activity was higher as the concentration of SeNPs increased and the size of SeNPs decreased. The Michaelis constant (K _m) values and maximal reaction velocity (V _max) of the SeNPs for TMB oxidation were 0.0083 mol/L and 3.042 μmol/L min, respectively.