Matches in SemOpenAlex for { <https://semopenalex.org/work/W2048117557> ?p ?o ?g. }
- W2048117557 endingPage "7010" @default.
- W2048117557 startingPage "7002" @default.
- W2048117557 abstract "The exceptional ability of α-tocopherol (α-TOH) for scavenging free radicals is believed to also underlie its protective functions in respiratory epithelia. Phenols, however, can scavenge other reactive species. Herein, we report that α-TOH/α-TO− reacts with closed-shell O3(g) on the surface of inert solvent microdroplets in <1 ms to produce persistent α-TO−On−(n = 1−4) adducts detectable by online thermospray ionization mass spectrometry. The prototype phenolate PhO−, in contrast, undergoes electron transfer under identical conditions. These reactions are deemed to occur at the gas/liquid interface because their rates: (1) depend on pH, (2) are several orders of magnitude faster than within microdroplets saturated with O3(g). They also fail to incorporate solvent into the products: the same α-TO−On− species are formed on acetonitrile or nucleophilic methanol microdroplets. α-TO−On = 1−3− signals initially evolve with [O3(g)] as expected from first-generation species, but α-TO−O− reacts further with O3(g) and undergoes collisionally induced dissociation into a C19H40 fragment (vs C19H38 from α-TO−) carrying the phytyl side chain, whereas the higher α-TO−On ≥ 2− homologues are unreactive toward O3(g) and split CO2 instead. On this basis, α-TO−O− is assigned to a chroman-6-ol (4a, 8a)-ene oxide, α-TO−O2− to an endoperoxide, and α-TO−O3− to a secondary ozonide. The atmospheric degradation of the substituted phenols detected in combustion emissions is therefore expected to produce related oxidants on the aerosol particles present in the air we breathe." @default.
- W2048117557 created "2016-06-24" @default.
- W2048117557 creator A5068302586 @default.
- W2048117557 creator A5071788870 @default.
- W2048117557 creator A5078307783 @default.
- W2048117557 date "2009-05-26" @default.
- W2048117557 modified "2023-09-23" @default.
- W2048117557 title "How Phenol and α-Tocopherol React with Ambient Ozone at Gas/Liquid Interfaces" @default.
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