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Mass Spectrom."],"published-print":{"date-parts":[[2008,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>In the present study, we have characterized in detail the MS<jats:sup>2<\/jats:sup> and MS<jats:sup>3<\/jats:sup> fragmentation behaviors, using electrospray ionization (ESI) in the negative ion mode, of previously identified sulfated isoprene secondary organic aerosol compounds, including 2\u2010methyltetrols, 2\u2010methylglyceric acid, 2\u2010methyltetrol mononitrate derivatives, glyoxal and methylglyoxal. A major fragmentation pathway for the deprotonated molecules of the sulfate esters of 2\u2010methyltetrols and 2\u2010methylglyceric acid and of the sulfate derivatives of glyoxal and methylglyoxal is the formation of the bisulfate [HSO<jats:sub>4<\/jats:sub>]<jats:sup>\u2212<\/jats:sup> anion, while the deprotonated sulfate esters of 2\u2010methyltetrol mononitrate derivatives preferentially fragment through loss of nitric acid. Rational interpretation of MS<jats:sup>2<\/jats:sup>, MS<jats:sup>3<\/jats:sup> and accurate mass data led to the structural characterization of unknown polar compounds in K\u2010puszta fine aerosol as organosulfate derivatives of photooxidation products of unsaturated fatty acids, i.e. 2\u2010hydroxy\u20101,4\u2010butanedialdehyde, 4,5\u2010 and 2,3\u2010dihydroxypentanoic acids, and 2\u2010hydroxyglutaric acid, and of \u03b1\u2010pinene, i.e. 3\u2010hydroxyglutaric acid. The deprotonated molecules of the sulfated hydroxyacids, 2\u2010methylglyceric acid, 4,5\u2010 and 2,3\u2010dihydroxypentanoic acid, and 2\u2010 and 3\u2010hydroxyglutaric acids, showed in addition to the [HSO<jats:sub>4<\/jats:sub>]<jats:sup>\u2212<\/jats:sup> ion (<jats:italic>m<\/jats:italic>\/<jats:italic>z<\/jats:italic> 97) neutral losses of water, CO<jats:sub>2<\/jats:sub> and\/or SO<jats:sub>3<\/jats:sub>, features that are characteristic of humic\u2010like substances. The polar organosulfates characterized in the present work are of climatic relevance because they may contribute to the hydrophilic properties of fine ambient aerosol. In addition, these compounds probably serve as ambient tracer compounds for the occurrence of secondary organic aerosol formation under acidic conditions. Copyright \u00a9 2007 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/jms.1329","type":"journal-article","created":{"date-parts":[[2007,10,29]],"date-time":"2007-10-29T07:15:11Z","timestamp":1193642111000},"page":"371-382","source":"Crossref","is-referenced-by-count":228,"title":["Characterization of organosulfates from the photooxidation of isoprene and unsaturated fatty acids in ambient aerosol using liquid chromatography\/(<b>\u2212<\/b>) electrospray ionization mass spectrometry"],"prefix":"10.1002","volume":"43","author":[{"given":"Yadian","family":"G\u00f3mez\u2010Gonz\u00e1lez","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jason 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