Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 16, Issue 6, Pages 1786-1792Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200902534
Keywords
electrocatalysis; metallic impurities; nanotubes; peptides; redox chemistry
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Funding
- MEXT Japan
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In this article, we show that the redox properties of the regulatory peptide L-glutathione are affected by the presence of nickel oxide impurities within single-walled carbon nanotubes (SWCNTs). Glutathione is a powerful antioxidant that protects cells from oxidative stress by removing free radicals and peroxides. We show that the L-cysteine moiety in L-glutathione is responsible for the susceptibility to oxidation by metallic impurities present in the carbon nanotubes. These results have great significance for assessing the toxicity of carbon-nanotube materials. The SWCNTs were characterized by Raman spectroscopy, high-resolution X-ray photoelectron spectroscopy. transmission electron microscopy, and energy dispersive X-ray spectroscopy.
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