{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Rana MS"],"funding":["Division of Chemistry"],"pagination":["2900-2909"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC9762487"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["6(12)"],"pubmed_abstract":["Biomass burning emissions contain abundant phenolic aldehydes (e.g., syringaldehyde, vanillin, and 4-hydroxybenaldehyde) that are oxidized during atmospheric transport, altering the physicochemical properties of particulates. Herein, the oxidative processing of thin films made of syringaldehyde, vanillin, and 4-hydroxybenaldehyde is studied at the air-solid interface under a variable O<sub>3</sub>(g) molar ratio (410 ppbv-800 ppmv) and relative humidity (0-90%). Experiments monitored the absorption changes of C=C, C=O, and -COOH vibration changes during the oxidation of thin films by transmission Fourier transform infrared spectroscopy (FTIR). Selected spectroscopic features of aromatic ring cleavage by O<sub>3</sub>(g) revealed the production of carboxylic acids. Instead, monitoring O-H stretching provided a comparison of a hydroxylation channel from in situ produced hydroxyl radical. The overall oxidation reactivity trend syringaldehyde > vanillin > 4-hydroxybenzladehyde can be explained based on the additional electron density from methoxide substituents to the ring. The reactive uptake coefficient of O<sub>3</sub>(g) increases for higher relative humidity, e.g., for syringaldehyde by 18 and 215 times at 74% and 90% relative humidity (RH), respectively, as compared to dry conditions. A Langmuir-Hinshelwood mechanism fits well the kinetics of oxidation under a variable O<sub>3</sub>(g) molar ratio at 74% RH, providing useful information that should be included in atmospheric chemistry models."],"journal":["ACS earth & space chemistry"],"pubmed_title":["Oxidation of Phenolic Aldehydes by Ozone and Hydroxyl Radicals at the Air-Solid Interface."],"pmcid":["PMC9762487"],"funding_grant_id":["1903744"],"pubmed_authors":["Guzman MI","Rana MS"],"additional_accession":[]},"is_claimable":false,"name":"Oxidation of Phenolic Aldehydes by Ozone and Hydroxyl Radicals at the Air-Solid Interface.","description":"Biomass burning emissions contain abundant phenolic aldehydes (e.g., syringaldehyde, vanillin, and 4-hydroxybenaldehyde) that are oxidized during atmospheric transport, altering the physicochemical properties of particulates. Herein, the oxidative processing of thin films made of syringaldehyde, vanillin, and 4-hydroxybenaldehyde is studied at the air-solid interface under a variable O<sub>3</sub>(g) molar ratio (410 ppbv-800 ppmv) and relative humidity (0-90%). Experiments monitored the absorption changes of C=C, C=O, and -COOH vibration changes during the oxidation of thin films by transmission Fourier transform infrared spectroscopy (FTIR). Selected spectroscopic features of aromatic ring cleavage by O<sub>3</sub>(g) revealed the production of carboxylic acids. Instead, monitoring O-H stretching provided a comparison of a hydroxylation channel from in situ produced hydroxyl radical. The overall oxidation reactivity trend syringaldehyde > vanillin > 4-hydroxybenzladehyde can be explained based on the additional electron density from methoxide substituents to the ring. The reactive uptake coefficient of O<sub>3</sub>(g) increases for higher relative humidity, e.g., for syringaldehyde by 18 and 215 times at 74% and 90% relative humidity (RH), respectively, as compared to dry conditions. A Langmuir-Hinshelwood mechanism fits well the kinetics of oxidation under a variable O<sub>3</sub>(g) molar ratio at 74% RH, providing useful information that should be included in atmospheric chemistry models.","dates":{"release":"2022-01-01T00:00:00Z","publication":"2022 Dec","modification":"2026-06-03T12:29:44.933Z","creation":"2025-04-25T20:01:28.275Z"},"accession":"S-EPMC9762487","cross_references":{"pubmed":["36561198"],"doi":["10.1021/acsearthspacechem.2c00206"]}}