title: Photochemical generation of photoactive compounds with fulvic-like and humic-like fluorescence in aqueous solution.
abstract: The irradiation of L-tryptophan, L-tyrosine and 4-phenoxyphenol in aqueous solution produced compounds with similar fluorescence properties as humic substances, and with absorption spectra that were significantly extended into the UVA and visible regions compared to the starting compounds. The irradiated systems had photosensitizing properties, as proven by the photodegradation of 2,4,6-trimethylphenol and furfuryl alcohol (probes of excited triplet states and (1)O2, respectively). The described photochemical processes could constitute an additional pathway for the formation of humic substances in clear and shallow water bodies, which would be added to the complex network of reactions involving dissolved organic matter.
authors.affiliation: Università di Torino, Dipartimento di Chimica, Via Pietro Giuria 5, 10125 Torino, Italy(1).
authors.forename: Angelica
authors.initials: A
authors.lastname: Bianco
authors.affiliation: Università di Torino, Dipartimento di Chimica, Via Pietro Giuria 5, 10125 Torino, Italy(1).
authors.forename: Marco
authors.initials: M
authors.lastname: Minella
authors.affiliation: Università di Torino, Dipartimento di Chimica, Via Pietro Giuria 5, 10125 Torino, Italy(1).
authors.forename: Elisa
authors.initials: E
authors.lastname: De Laurentiis
authors.affiliation: Università di Torino, Dipartimento di Chimica, Via Pietro Giuria 5, 10125 Torino, Italy(1).
authors.forename: Valter
authors.initials: V
authors.lastname: Maurino
authors.affiliation: Università di Torino, Dipartimento di Chimica, Via Pietro Giuria 5, 10125 Torino, Italy(1).
authors.forename: Claudio
authors.initials: C
authors.lastname: Minero
authors.affiliation: Università di Torino, Dipartimento di Chimica, Via Pietro Giuria 5, 10125 Torino, Italy(1); Università di Torino, Centro Interdipartimentale NatRisk, Via L. Da Vinci 44, 10095 Grugliasco (TO), Italy(2). Electronic address: davide.vione@unito.it.
authors.forename: Davide
authors.initials: D
authors.lastname: Vione
mesh_terms: D001578:Benzopyrans / Q000032:analysis; D003408:Cresols / Q000737:chemistry* / Q000302:isolation & purification; D005453:Fluorescence; D005663:Furans / Q000737:chemistry* / Q000302:isolation & purification; D006812:Humic Substances / Q000032:analysis*; D010647:Phenyl Ethers / Q000737:chemistry*; D055668:Photochemical Processes; D010782:Photolysis; D013050:Spectrometry, Fluorescence; D014364:Tryptophan / Q000737:chemistry*; D014443:Tyrosine / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D001578:Benzopyrans; D003408:Cresols; D005663:Furans; D006812:Humic Substances; D010647:Phenyl Ethers; D014867:Water; D014443:Tyrosine; D014364:Tryptophan; C012986:furfuryl alcohol; C530483:4-phenoxyphenol; C505148:2,4,6-trimethylphenol; C005023:fulvic acid
keywords: Autochthonous and allochthonous organic matter; Environmental photochemistry; Excitation–emission matrix; Photoinduced transformation; Singlet oxygen; Triplet sensitizers