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Environ Sci Technol

Title:		Elucidation of the Photochemical Fate of Methionine in the Presence of Surrogate and Standard Dissolved Organic Matter under Sunlight Irradiation
Author(s):		Mohrhardt B; Barrios B; Kibler R; King W; Doskey PV; Minakata D;
Address:		"Department of Civil, Environmental and Geospatial Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931, United States. College of Forest Resources and Environmental Science, Michigan Technological, 1400 Townsend Drive, Houghton, Michigan 49931, United States University"
Journal Title:		Environ Sci Technol
Year:		2023
Volume:		20230915
Issue:		38
Page Number:		14363 - 14372
DOI:		10.1021/acs.est.3c04176
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"The abiotic fate of dissolved free amino acids considerably contributes to the cycling of dissolved sulfur and nitrogen in natural aquatic environments. However, the roles of the functional groups of chromophoric dissolved organic matter (CDOM) and the fate of free amino acids under sunlight irradiation in fresh waters are not fully understood. This study aims to elucidate the fate of photolabile methionine in the presence of three CDOM surrogate compounds, i.e., 1,4-naphthoquinone, 2-naphthaldehyde, and umbelliferone, and two standard CDOM by coupling experimental measurement, quantum chemical computations, and kinetic modeling. Results indicate that excited triplet-state CDOM and hydroxyl radicals are able to cleave the C-S bond in methionine, resulting in the formation of smaller amino acids and volatile sulfur-containing compounds. Singlet oxygen forms methionine sulfoxide and methionine sulfone. The distribution of phototransformation products offers an improved understanding of the fate of nitrogen- and sulfur-containing compounds and their uptake by microorganisms in natural aquatic environments"
Keywords:		*Dissolved Organic Matter *Sunlight Methionine Racemethionine Amino Acids chromophoric dissolved organic matter photochemical fate;
Notes:		"MedlineMohrhardt, Benjamin Barrios, Benjamin Kibler, Ryan King, Wynter Doskey, Paul V Minakata, Daisuke eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2023/09/16 Environ Sci Technol. 2023 Sep 26; 57(38):14363-14372. doi: 10.1021/acs.est.3c04176. Epub 2023 Sep 15"