ピレンキノンの大気粒子中濃度と酸化能評価

Abstract

Atmospheric quinoid polycyclic aromatic hydrocarbons (QPAHs) have been shown to have adverse health effects as redox-active species in particulate matters (PM). Several QPAHs are known to be very reactive in the dithiothreitol (DTT) assay, but it is unclear if pyrenequinones, their parent pyrene is one of the most abundant PAHs in the atmosphere, contribute to the loss of DTT in PM extracts. Herein by employing the DTT assay, we evaluated oxidative potentials of three pyrenquinone isomers (4, 5-Pyrenequinone (4, 5-PyQ) and a mixture of 1, 6-/1, 8-Pyrenequinones (1, 6- /1, 8-PyQ)) along with 9, 10-Phenanthrenequinone (PQN), 1, 2-Naphthoquinone (1, 2-NQN), and 1, 4-Naphthoquinone (1, 4-NQN), DTT loss rates of which were examined previously. Our results demonstrate that the DTT consumption by ortho type QPAHs is fast, particularly by 4, 5-PyQ. The order of DTT loss rate by the QPAHs tested in this study is as follows: 4, 5-PyQ ~ PQN > 1, 2-NQN > 1, 6-/1, 8-PyQ ~ 1, 4-NQN.