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Vasodilatory compounds in the weak acidic fraction of a benzene extract of diesel exhaust particles (DEP) were fractionated by column chromatography through silica gel, and the chemical structures of these compounds were analyzed using GC-MS and 1H-NMR. The compounds in DEP that cause vasodilation — 3- and 4-nitrophenol, 2-methyl-4-nitrophenol, 3-methy-4-nitrophenol, and 4-nitro-3-phenylphenol — were isolated and identified. All five of these nitrophenols had vasodilatory activities (10-4 to 10-6 M) in rat thoracic artery assays, and 4-nitro-3-phenylphenol was the most potent vasodilator among these compounds. In addition, nine other alkylnitrophenols were isolated from the benzene extract of DEP and characterized.

Investigation of Vasodilatory Substances in Diesel Exhaust Particles (DEP): Isolation and Identification of Nitrophenol Derivatives