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Tsuruoka S, Takeuchi K, Koyama K, Noguchi T, Endo M, Tristan F, Terrones M, Matsumoto H, Saito N, Usui Y, Porter DW, Castranova V. ROS evaluation for a series of CNTs and their derivatives using an ESR method with DMPO. ACTA ACUST UNITED AC 2013; 429. [PMID: 26300949 DOI: 10.1088/1742-6596/429/1/012029] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Carbon nanotubes (CNTs) are important materials in advanced industries. It is a concern that pulmonary exposure to CNTs may induce carcinogenic responses. It has been recently reported that CNTs scavenge ROS though non-carbon fibers generate ROS. A comprehensive evaluation of ROS scavenging using various kinds of CNTs has not been demonstrated well. The present work specifically investigates ROS scavenging capabilities with a series of CNTs and their derivatives that were physically treated, and with the number of commercially available CNTs. CNT concentrations were controlled at 0.2 through 0.6 wt%. The ROS scavenging rate was measured by ESR with DMPO. Interestingly, the ROS scavenging rate was not only influenced by physical treatments, but was also dependent on individual manufacturing methods. Ratio of CNTs to DMPO/ hydrogen peroxide is a key parameter to obtain appropriate ROS quenching results for comparison of CNTs. The present results suggest that dangling bonds are not a sole factor for scavenging, and electron transfer on the CNT surface is not clearly determined to be the sole mechanism to explain ROS scavenging.
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Affiliation(s)
- S Tsuruoka
- Shinshu University, Research Center for Exotic Nanocarbons, 4-17-1 Wakasato, Nagano, Japan
| | - K Takeuchi
- Shinshu University, Faculty of Engineering, Research Center for Exotic Nanocarbons, 4-17-1 Wakasato, Nagano, Japan
| | - K Koyama
- Shinshu University, Faculty of Engineering, Research Center for Exotic Nanocarbons, 4-17-1 Wakasato, Nagano, Japan
| | - T Noguchi
- Shinshu University, Research Center for Exotic Nanocarbons, 4-17-1 Wakasato, Nagano, Japan
| | - M Endo
- Shinshu University, Research Center for Exotic Nanocarbons, 4-17-1 Wakasato, Nagano, Japan
| | - F Tristan
- Shinshu University, Research Center for Exotic Nanocarbons, 4-17-1 Wakasato, Nagano, Japan
| | - M Terrones
- Shinshu University, Research Center for Exotic Nanocarbons, 4-17-1 Wakasato, Nagano, Japan
| | - H Matsumoto
- Department of Organic and Polymeric Materials Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, JAPAN
| | - N Saito
- Department of Applied Physical Therapy, Shinshu University, School of Health Sciences, 3-1-1 Asahi, Matsumoto, Nagano, Japan
| | - Y Usui
- Shinshu University, Faculty of Engineering, Research Center for Exotic Nanocarbons, 4-17-1 Wakasato, Nagano, Japan
| | - D W Porter
- National Institute for Occupational Safety and Health, Morgantown, WV, USA
| | - V Castranova
- National Institute for Occupational Safety and Health, Morgantown, WV, USA
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