By a News Reporter-Staff News Editor at Life Science Weekly -- A new study on Chalcogens is now available. According to news reporting from Uttar Pradesh, India, by NewsRx journalists, research stated, "Antibacterial activity of ZnO nanoparticles (NPs) triggered by generation of reactive oxygen species (ROS) depends on the fate of photoexcited charge carriers. Batches of wide band gap ZnO NPs of 7-9 nm sizes, capped with polyethylene glycol (PEG), ascorbic acid (AsA), mercaptoacetic acid (MAA) and polysorbate 80 (T-80) were synthesized by precipitation method."
The news correspondents obtained a quote from the research from the Indian Institute of Technology, "These capped ZnO NPs exhibited ROS induced antibacterial activity, where the ROS was measured by TBARS assay. The PEG capped and AsA capped ZnO NPs exhibited weaker antibacterial activity and were correlated with strong and broad green emission peak owing to oxygen vacancies. The oxygen vacancies were trap sites of photoexcited electrons which inhibited interaction between the photoexcited electrons and oxygen on the surface of the ZnO NPs and accounted for lesser ROS generation and subsequently weaker antibacterial activity. Contrastingly MAA capped and T-80 capped ZnO NPs did not exhibit significant green emission peak, but exhibited 13% and 43% inhibition of growth of E. coli, respectively."
According to the news reporters, the research concluded: "The lack of oxygen vacancy defects in MAA capped and T-80 capped ZnO NPs perhaps led to lesser trapping of charge carriers, which is favorable for higher ROS generation and consequently higher antibacterial activity."
For more information on this research see: Correlation between defects in capped ZnO nanoparticles and their antibacterial activity. Journal of Photochemistry and Photobiology B-Biology, 2013;126():105-111. Journal of Photochemistry and Photobiology B-Biology can be contacted at: Elsevier Science Sa, PO Box 564, 1001 Lausanne, Switzerland (see also Chalcogens).
Our news journalists report that additional information may be obtained by contacting R.K. Dutta, Indian Inst Technol Roorkee, Dept. of Chem, Roorkee 247667, Uttar Pradesh, India. Additional authors for this research include B.P. Nenavathu and M.K. Gangishetty.
Keywords for this news article include: Asia, India, Chalcogens, Nanoparticle, Uttar Pradesh, Nanotechnology, Emerging Technologies
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