Properties of the humic-like material arising from the photo-transformation of L-tyrosine. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Science of the Total Environment Année : 2016

Properties of the humic-like material arising from the photo-transformation of L-tyrosine.

Résumé

The UVB photolysis of l-tyrosine yields species with fluorescence and absorption spectra that are very similar to those of humic substances. By potentiometric measurements, chemical modeling and the application of NMR, mass spectrometry and laser flash photolysis, it was possible to get insights into the structural and chemical properties of the compounds derived by the l-tyrosine phototransformation. The photolytic process follows aromatic-ring hydroxylation and dimerization. The latter is presumably linked with the photoinduced generation of tyrosyl (phenoxy-type) radicals, which have a marked tendency to dimerize and possibly oligomerize. Interestingly, photoinduced transformation gives compounds with protogenic and complexation capabilities similar to those of the humic substances that occur naturally in surface waters. This finding substantiates a new and potentially important abiotic (photolytic) pathway for the formation of humic compounds in surface-water environments.
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Dates et versions

hal-01288068 , version 1 (14-03-2016)

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Silvia Berto, Elisa De Laurentiis, Tiziana Tota, Enrico Chiavazza, Pier Giuseppe Daniele, et al.. Properties of the humic-like material arising from the photo-transformation of L-tyrosine.. Science of the Total Environment, 2016, 545-546, pp.434-444. ⟨10.1016/j.scitotenv.2015.12.047⟩. ⟨hal-01288068⟩
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