Spin-trapping ESR spectroscopy was used to study the effect of plant antioxidants lycopene, pycnogenol and grape seed extract on scavenging gas-phase free radicals in cigarette smoke.
Yu, L., Dzikovski, B. G., Freed, J. H. A Protocol for Detecting and Scavenging Gas-phase Free Radicals in Mainstream Cigarette Smoke. J. Vis. Exp. (59), e3406, doi:10.3791/3406 (2012).