Oxidation product characterization from ozonolysis of the diterpene ent-kaurene

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dc.contributor.author Luo, Yuanyuan
dc.contributor.author Garmash, Olga
dc.contributor.author Li, Haiyan
dc.contributor.author Graeffe, Frans
dc.contributor.author Praplan, Arnaud P.
dc.contributor.author Liikanen, Anssi
dc.contributor.author Zhang, Yanjun
dc.contributor.author Meder, Melissa
dc.contributor.author Peräkylä, Otso
dc.contributor.author Pẽnuelas, Josep
dc.contributor.author Yáñez-Serrano, Ana María
dc.contributor.author Ehn, Mikael
dc.date.accessioned 2022-05-06T10:34:59Z
dc.date.available 2022-05-06T10:34:59Z
dc.date.issued 2022
dc.identifier.uri http://hdl.handle.net/10138/343383
dc.description.abstract Diterpenes (C20H32) are biogenically emitted volatile compounds that only recently have been observed in ambient air. They are expected to be highly reactive, and their oxidation is likely to form condensable vapors. However, until now, no studies have investigated gas-phase diterpene oxidation. In this paper, we explored the ozonolysis of a diterpene, ent-kaurene, in a simulation chamber. Using state-of-the-art mass spectrometry, we characterized diterpene oxidation products for the first time, and we identified several products with varying oxidation levels, including highly oxygenated organic molecules (HOM), monomers, and dimers. The most abundant monomers measured using a nitrate chemical ionization mass spectrometer were C19H28O8 and C20H30O5, and the most abundant dimers were C38H60O6 and C39H62O6. The exact molar yield of HOM from kaurene ozonolysis was hard to quantify due to uncertainties in both the kaurene and HOM concentrations, but our best estimate was a few percent, which is similar to values reported earlier for many monoterpenes. We also monitored the decrease in the gas-phase oxidation products in response to an increased condensation sink in the chamber to deduce their affinity to condense. The oxygen content was a critical parameter affecting the volatility of products, with four to five O atoms needed for the main monomeric species to condense onto 80 nm particles. Finally, we report on the observed fragmentation and clustering patterns of kaurene in a Vocus proton-transferreaction time-of-flight mass spectrometer. Our findings highlight similarities and differences between diterpenes and smaller terpenes during their atmospheric oxidation, but more studies on different diterpenes are needed for a broader view of their role in atmospheric chemistry.
dc.language.iso en
dc.publisher Copernicus Publ.
dc.relation.ispartofseries Atmospheric chemistry and physics
dc.rights CC BY 4.0
dc.subject dieterpenes
dc.subject ent-kaurene
dc.subject atmospheric chemistry
dc.title Oxidation product characterization from ozonolysis of the diterpene ent-kaurene
dc.format.volume 22
dc.identifier.urn URN:NBN:fi-fe2022050231954
dc.contributor.organization Ilmatieteen laitos fi
dc.contributor.organization Finnish Meteorological Institute en
dc.format.pagerange 5619-5637
dc.relation.doi 10.5194/acp-22-5619-2022
dc.relation.issn 1680-7316
dc.relation.issn 1680-7324
dc.type.okm A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.type.okm A1 Journal article (refereed), original research en

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