Summary
Introduction:
This text is a scientific study on the formation of polycyclic aromatic hydrocarbons (Pahs) from the pyrolysis of tobacco. The study investigates the yields and mechanisms of Pah formation in the temperature range of 350-600°C, as well as the effect of solvent extraction on Pah yields. The results of this study have implications for understanding the formation of Pahs in tobacco products and their potential health effects.
Key Points:
* Pah yields were measured for nine condensed ring Pahs in the pyrolysis of bright tobacco at 600°C.
* The study found that Pah yields pass through a maximum over the 500-550°C temperature range and then decrease sharply.
* The evolution profiles of Pahs from bright tobacco were investigated as a function of pyrolysis temperature.
* The study found that Pah yields were not significantly affected by increasing the concentration and residence time of pyrolysis products in the gas phase.
* The yields and evolution profiles of Pahs were not significantly affected by changing the heating rate.
* The study found that water extracts of tobacco contained higher yields of Pahs compared to non-extracted or hexane-extracted tobacco.
* The NMR spectrum of water-extracted tobacco showed the removal of water-soluble organic acids, alkaloids, amino acids, pectin, sugars, and phenolics.
* The study suggests that cell wall components of tobacco are the predominant precursors to Pahs at temperatures below 60
Citation
McGrath, Thomas E., Jan B. Wooten, W. Geoffrey Chan, and Mohammad R. hajaligol. “Formation of Polycyclic aromatic hydrocarbons from Tobacco: The Link between Low Temperature Residual Solid (Char) and Pah Formation.” Food and Chemical Toxicology 45, no. 6 (June 2007): 1039–50. https://doi.org/10.1016/j.fct.2006.12.010.
