title: Detection and separation of gas-phase carbon-centered radicals from cigarette smoke and diesel exhaust.
abstract: Carbon-centered radicals were trapped from gas-phase cigarette smoke and diesel engine exhaust by reaction with a nitroxide, 3-amino-2,2,5,5-tetramethyl-1-pyrrolidinyloxy (3AP). The resulting mixture of stable, diamagnetic adducts was derivatized with naphthalenedicarboxaldehyde (NDA) to produce highly fluorescent products. Derivatives were separated by high-performance liquid chromatography (HPLC), which revealed distinctly different suites of radicals present in the two systems. Integration of HPLC peaks gave approximately 22 ± 7 nmol of radicals per cigarette and 3 ± 1 nmol of radicals per liter of diesel engine exhaust. An estimated 8-10 different carbon-centered radical species are present in each system.
authors.affiliation: Chemistry Department, Michigan Technological University, Houghton, Michigan 49931-1295.
authors.forename: T M
authors.initials: TM
authors.lastname: Flicker
authors.forename: S A
authors.initials: SA
authors.lastname: Green