Comparison of Gas-Phase Free-Radical Populations in Tobacco Smoke and Model Systems by HPLC
Environmental Health Perspectives
We used an improved method for trapping carbon-centered radicals (•R) from the gas-phase to compare radical suites trapped from various tobacco smoke and model smoke systems. Using a nitroxide trap, 3-amino-2,2,5,5-tetramethyl-1-pyrrolidinyloxy (3AP), on solid support, we trapped radicals directly from the gas phase, washed them off the support, and analyzed them with HPLC. Separation of the trapped radicals showed that each tobacco type produced a unique radical suite of 4-10 distinct peaks.
... 0 distinct peaks. Gas mixtures used to model tobacco smoke consisted of nitric oxide, air, isoprene, and methanol. The model systems produced radical suites of four major and several minor peaks, two of which matched peaks in tobacco smoke chromatograms. Quantities of radicals trapped from tobacco smoke were: 54 ± 2 nmol •R per Marlboro cigarette, 66 ± 9 nmol •R per Djarum clove cigarette, and 185 ± 9 nmol •R per Swisher Sweet cigar. In these experiments oxygen competes with the nitroxide trap for gas-phase radicals. A kinetic analysis of the O 2 competition shows that actual radical concentrations in the smoke were approximately 100-fold higher than measured. Key words: fluorescence detection, free radical, HPLC, inhaled radicals, isoprene, lung damage, nitroxide, radical detection, smoke reactions, tobacco smoke. Environ Health Perspect 109:765-771 (2001). [Online 31 July 2001] http://ehpnet1.niehs.nih.gov/docs/2001/109p765-771flicker/abstract.html