@article{claeys_secondary_2021,
	title = {Secondary {Organic} {Aerosol} {Formation} from {Isoprene}: {Selected} {Research}, {Historic} {Account} and {State} of the {Art}},
	volume = {12},
	copyright = {http://creativecommons.org/licenses/by/3.0/},
	shorttitle = {Secondary {Organic} {Aerosol} {Formation} from {Isoprene}},
	url = {https://www.mdpi.com/2073-4433/12/6/728},
	doi = {10.3390/atmos12060728},
	abstract = {In this review, we cover selected research on secondary organic aerosol (SOA) formation from isoprene, from the beginning of research, about two decades ago, to today. The review begins with the first observations of isoprene SOA markers, i.e., 2-methyltetrols, in ambient fine aerosol and focuses on studies dealing with molecular characterization, speciation, formation mechanisms, and source apportionment. A historic account is given on how research on isoprene SOA has developed. The isoprene SOA system is rather complex, with different pathways being followed in pristine and polluted conditions. For SOA formation from isoprene, acid-catalyzed hydrolysis is necessary, and sulfuric acid enhances SOA by forming additional nonvolatile products such as organosulfates. Certain results reported in early papers have been re-interpreted in the light of recent results; for example, the formation of C5-alkene triols. Attention is given to mass spectrometric and separation techniques, which played a crucial role in molecular characterization. The unambiguous structural characterization of isoprene SOA markers has been achieved, owing to the preparation of reference compounds. Efforts have also been made to use air quality data to estimate the influence of biogenic and pollution aerosol sources. This review examines the use of an organic marker-based method and positive matrix factorization to apportion SOA from different sources, including isoprene SOA.},
	language = {en},
	number = {6},
	urldate = {2021-10-14},
	journal = {Atmosphere},
	author = {Claeys, Magda and Maenhaut, Willy},
	month = jun,
	year = {2021},
	note = {Number: 6
Publisher: Multidisciplinary Digital Publishing Institute},
	keywords = {2-methylglyceric acid, 2-methyltetrols, C$_{\textrm{5}}$-alkene triols, IEPOX, isoprene, organosulfates, particulate matter, secondary organic aerosol, source apportionment},
	pages = {728},
}

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The review begins with the first observations of isoprene SOA markers, i.e., 2-methyltetrols, in ambient fine aerosol and focuses on studies dealing with molecular characterization, speciation, formation mechanisms, and source apportionment. A historic account is given on how research on isoprene SOA has developed. The isoprene SOA system is rather complex, with different pathways being followed in pristine and polluted conditions. For SOA formation from isoprene, acid-catalyzed hydrolysis is necessary, and sulfuric acid enhances SOA by forming additional nonvolatile products such as organosulfates. Certain results reported in early papers have been re-interpreted in the light of recent results; for example, the formation of C5-alkene triols. Attention is given to mass spectrometric and separation techniques, which played a crucial role in molecular characterization. The unambiguous structural characterization of isoprene SOA markers has been achieved, owing to the preparation of reference compounds. Efforts have also been made to use air quality data to estimate the influence of biogenic and pollution aerosol sources. 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