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- W2034705102 abstract "Nitrogen dioxide (NO(2)), a sparingly water-soluble pi-radical gas, is a criteria air pollutant that induces adverse health effects. How is inhaled NO(2)(g) incorporated into the fluid microfilms lining respiratory airways remains an open issue because its exceedingly small uptake coefficient (gamma approximately 10(-7)-10(-8)) limits physical dissolution on neat water. Here, we investigate whether the biological antioxidants present in these fluids enhance NO(2)(g) dissolution by monitoring the surface of aqueous ascorbate, urate, and glutathione microdroplets exposed to NO(2)(g) for approximately 1 ms via online thermospray ionization mass spectrometry. We found that antioxidants catalyze the hydrolytic disproportionation of NO(2)(g), 2NO(2)(g) + H(2)O(l) = NO(3)(-)(aq) + H(+)(aq) + HONO, but are not consumed in the process. Because this function will be largely performed by chloride, the major anion in airway lining fluids, we infer that inhaled NO(2)(g) delivers H(+), HONO, and NO(3)(-) as primary transducers of toxic action without antioxidant participation." @default.
- W2034705102 created "2016-06-24" @default.
- W2034705102 creator A5068302586 @default.
- W2034705102 creator A5071788870 @default.
- W2034705102 creator A5078307783 @default.
- W2034705102 date "2009-05-15" @default.
- W2034705102 modified "2023-10-01" @default.
- W2034705102 title "Absorption of Inhaled NO<sub>2</sub>" @default.
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- W2034705102 doi "https://doi.org/10.1021/jp902667x" @default.
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