Aquatic indirect photochemical transformations of natural peptidic thiols: impact of thiol properties, solution pH, solution salinity and metal ions

Environmental Science. Processes & Impacts
Chiheng ChuKristopher McNeill

Abstract

Natural peptidic thiols play numerous important roles in aquatic systems. While thiols are known to be susceptible to sensitized photoreaction, the photochemical transformation of thiols in surface waters remains largely unknown. This study systematically assessed the photochemical transformation of naturally occurring thiols, including arginylcysteine (RC), γ-glutamylcysteine (γEC), glutathione (GSH), and phytochelatin (PC) in solutions containing dissolved organic matter (DOM). The results show that all thiols underwent rapid indirect photochemical transformation. The transformation rates of thiols were highly pH-dependent and increased with increasing solution pH. γEC and GSH show lower transformation rates than free Cys, which was ascribed to their higher thiol pKa values. In comparison, PC and RC show much higher transformation rates than γEC and GSH, due to more reactive thiol groups contained in the PC molecule and sorption of RC to DOM macromolecules, respectively. While all investigated pathways contributed to thiol transformation, hydroxyl radical-mediated oxidation dominated at low solution pH and singlet oxygen-mediated oxidation dominated at high solution pH in the DOM-sensitized phototransformations of γEC, GSH, a...Continue Reading

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May 14, 2016·Environmental Science & Technology·Chiheng ChuKristopher McNeill

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Citations

Sep 5, 2018·Environmental Science and Pollution Research International·Se WangWillie J G M Peijnenburg
Jan 16, 2021·Environmental Science & Technology·Moshan ChenKimberly M Parker
Sep 17, 2020·Environmental Science & Technology·Rachele OssolaKristopher McNeill
Aug 7, 2018·Environmental Science & Technology·Ke Zhang, Kimberly M Parker
Jun 27, 2019·Environmental Science & Technology·Davide Vione, Andrea Scozzaro

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Methods Mentioned

BETA
NMR
quartz crystal microbalance

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