Dataset Information

Radical Generation from the Gas-Phase Activation of Ionized Lipid Ozonides.

ABSTRACT: Reaction products from the ozonolysis of unsaturated lipids at gas-liquid interfaces have the potential to significantly influence the chemical and physical properties of organic aerosols in the atmosphere. In this study, the gas-phase dissociation behavior of lipid secondary ozonides is investigated using ion-trap mass spectrometry. Secondary ozonides were formed by reaction between a thin film of unsaturated lipids (fatty acid methyl esters or phospholipids) with ozone before being transferred to the gas phase as [M + Na]⁺ ions by electrospray ionization. Activation of the ionized ozonides was performed by either energetic collisions with helium buffer-gas or laser photolysis, with both processes yielding similar product distributions. Products arising from the decomposition of the ozonides were characterized by their mass-to-charge ratio and subsequent ion-molecule reactions. Product assignments were rationalized as arising from initial homolysis of the ozonide oxygen-oxygen bond with subsequent decomposition of the nascent biradical intermediate. In addition to classic aldehyde and carbonyl oxide-type fragments, carbon-centered radicals were identified with a number of decomposition pathways that indicated facile unimolecular radical migration. These findings reveal that photoactivation of secondary ozonides formed by the reaction of aerosol-bound lipids with tropospheric ozone may initiate radical-mediated chemistry within the particle resulting in surface modification. Graphical Abstract ?.

SUBMITTER: Ellis SR

PROVIDER: S-EPMC5486690 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature

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Radical Generation from the Gas-Phase Activation of Ionized Lipid Ozonides.

Ellis Shane R SR Pham Huong T HT In Het Panhuis Marc M Trevitt Adam J AJ Mitchell Todd W TW Blanksby Stephen J SJ

Journal of the American Society for Mass Spectrometry 20170508 7

Reaction products from the ozonolysis of unsaturated lipids at gas-liquid interfaces have the potential to significantly influence the chemical and physical properties of organic aerosols in the atmosphere. In this study, the gas-phase dissociation behavior of lipid secondary ozonides is investigated using ion-trap mass spectrometry. Secondary ozonides were formed by reaction between a thin film of unsaturated lipids (fatty acid methyl esters or phospholipids) with ozone before being transferred ...[more]

PMID: 28484972

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Dataset Information

Radical Generation from the Gas-Phase Activation of Ionized Lipid Ozonides.

Publications

Radical Generation from the Gas-Phase Activation of Ionized Lipid Ozonides.

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