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The Radicals in Cigarette Tar: Their Nature and Suggested Physiological Implications
Abstract
The paramagnetism of cigarette tar is found to be associated with at least four different types of species. One of the types is responsible for over 80 percent of the total paramagnetism and has a signal intensity that is independent of temperature from 60 to 250 K. This non-Curie-Weiss temperature dependence indicates that the principal paramagnetic species in tar is not an organic monoradical (doublet) species but instead is a donor-acceptor excimer with a paramagnetic excited state and a diamagnetic ground state. Modeling experiments suggest that the excimer consists of quinone (Q) and hydroquinone (QH 2 ) molecules held in a tar matrix. Since such Q- QH 2 species are catalysts for the oxidation of hydrocarbons and are very active redox systems, this paramagnetic species may be implicated in the cocarcinogenic properties of tar. Alternatively, since semiquinone radicals are known to bind to DNA, the tar paramagnetic species may be directly involved in the carcinogenic properties of tar.
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Citations
Cited by
Raza, H., John, A., & Nemmar, A. (2013) · Cellular Physiology and Biochemistry · doi:10.1159/000350087 · Cited by 47,221
Tobacco Smoke Carcinogens and Lung Cancer
Hecht, S. S. (1999) · JNCI Journal of the National Cancer Institute · doi:10.1093/jnci/91.14.1194 · Cited by 1,976
Role of Free Radicals in the Toxicity of Airborne Fine Particulate Matter
Dellinger, B., Pryor, W. A., Cueto, R., Squadrito, G. L., Hegde, V., & Deutsch, W. A. (2001) · Chemical Research in Toxicology · doi:10.1021/tx010050x · Cited by 532
Self-citationValavanidis, A., Vlachogianni, T., & Fiotakis, K. (2009) · International Journal of Environmental Research and Public Health · doi:10.3390/ijerph6020445 · Cited by 519
“The most interesting is a quinone/semiquinone/hydroquinone (Q/QH/QH2) system in the tar polymeric matrix [25].”
Background
Metadata
- Authors
- Pryor, W. A., Hales, B. J., Premovic, P. I., & Church, D. F.
- Venue
- Science
- Published
- 1983-04-22
- Volume
- 220
- Issue
- 4595
- Pages
- 425-427
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2064037258
- Cited by
- 312
- References
- 0
- FWCI
- 8.96
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: The Radicals in Cigarette Tar: Their Nature and Suggested Physiological Implications. https://app.cochat.ai/papers/10.1126/science.6301009
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- Pryor, W. A., Hales, B. J., Premovic, P. I., & Church, D. F. (1983). The Radicals in Cigarette Tar: Their Nature and Suggested Physiological Implications. Science. https://doi.org/10.1126/science.6301009
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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