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Regulatory Peptides Are Susceptible to Oxidation by Metallic Impurities within Carbon Nanotubes

✍ Scribed by Adriano Ambrosi; Martin Pumera

Book ID
102795661
Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
868 KB
Volume
16
Category
Article
ISSN
0947-6539

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✦ Synopsis

Abstract

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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## Abstract Carbon nanotubes (CNTs) are often employed in biofuel cells, artificial photosystems and bioelectronics in order to enhance electron transfer and to efficiently shuttle electrons between redox active molecules and the electrode surface. However, it should be noted that typical CNTs are