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Toxicological evaluation of propane expanded tobacco
Eugenia H Theophilus1, Betsy R Bombick, Daniel R Meckley
1Research and Development, R. J. Reynolds Tobacco Company (RJRT), Bowman Gray Technical Center, Winston-Salem, NC 27015, USA. theophe@rjrt.com
Summary
A new testing strategy compared propane expanded tobacco cigarettes to Freon-11 expanded ones. Biological tests showed no significant toxicological differences between the two types of cigarettes.
Area of Science:
- Toxicology
- Chemical analysis
- Biological testing
Background:
- Tobacco processing and ingredients can alter smoke biological activity.
- Propane expanded tobacco is a modern cigarette manufacturing component.
- Comparative chemical and biological testing informs this evaluation strategy.
Purpose of the Study:
- To evaluate the biological activity of cigarettes containing propane expanded tobacco.
- To compare propane expanded tobacco cigarettes with those using a traditional expansion agent (Freon-11).
Main Methods:
- Comparative chemical analysis of mainstream smoke constituents.
- In vitro toxicological studies (Ames test, sister chromatid exchange).
- In vivo studies including inhalation and dermal tumor promotion assays.
Main Results:
- Statistically significant differences were noted in some smoke constituents.
- Most constituents in propane expanded tobacco cigarettes fell within market ranges.
- No significant toxicological differences were found between propane and Freon-11 expanded tobacco cigarettes.
Conclusions:
- The tiered testing strategy effectively compared tobacco expansion methods.
- Propane and Freon-11 expanded tobacco cigarettes exhibited similar toxicological profiles.
- Technological developments in tobacco processing may not significantly alter biological activity.