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spelling paper:paper_1474905X_v8_n8_p1139_Gonzalez2023-06-08T16:17:49Z Photochemistry of norharmane in aqueous solution beta carboline hydrogen peroxide aqueous solution article atmosphere high performance liquid chromatography mass spectrometry matrix assisted laser desorption ionization time of flight mass spectrometry molecular stability photochemistry priority journal quantum yield thin layer chromatography ultraviolet spectroscopy Harmine Hydrogen Peroxide Hydrogen-Ion Concentration Mass Spectrometry Mutagens Oxygen Photochemistry Reactive Oxygen Species Singlet Oxygen Solutions Spectrometry, Fluorescence Water The photochemistry of norharmane (9H-pyrido[3,4-b]indole) in acidic (pH 5.0 ± 0.1) and alkaline (pH 10.0 ± 0.1) aqueous solutions was studied. The photochemical reactions were monitored by TLC, UV/VIS absorption spectroscopy, high-performance liquid chromatography (HPLC), electronic ionization-mass spectrometry (EI-MS), UV-laser desorption/ionization-time of flight-mass spectrometry (UV-LDI-TOF-MS) and an enzymatic method for H 2O2 determination. The neutral (nHoN) and the protonated (nHoH+) forms of norharmane irradiated under Ar atmosphere were photostable, but they suffered a photochemical transformation in the presence of O2, yielding as photoproducts norharmane dimers, trimers and tetramers. nHoN shown to be more photostable than nHoH+. The nHoH+ and nHoN consumption quantum yields were 1.82 × 10 -3 and 0.51 × 10-3, respectively, and the mechanisms involved in its photochemistry are discussed. H2O2 and singlet oxygen (1O2) were also detected and quantified in irradiated solutions of norharmane, and their role in the photochemistry of norharmane is discussed. © 2009 The Royal Society of Chemistry and Owner Societies. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1474905X_v8_n8_p1139_Gonzalez http://hdl.handle.net/20.500.12110/paper_1474905X_v8_n8_p1139_Gonzalez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic beta carboline
hydrogen peroxide
aqueous solution
article
atmosphere
high performance liquid chromatography
mass spectrometry
matrix assisted laser desorption ionization time of flight mass spectrometry
molecular stability
photochemistry
priority journal
quantum yield
thin layer chromatography
ultraviolet spectroscopy
Harmine
Hydrogen Peroxide
Hydrogen-Ion Concentration
Mass Spectrometry
Mutagens
Oxygen
Photochemistry
Reactive Oxygen Species
Singlet Oxygen
Solutions
Spectrometry, Fluorescence
Water
spellingShingle beta carboline
hydrogen peroxide
aqueous solution
article
atmosphere
high performance liquid chromatography
mass spectrometry
matrix assisted laser desorption ionization time of flight mass spectrometry
molecular stability
photochemistry
priority journal
quantum yield
thin layer chromatography
ultraviolet spectroscopy
Harmine
Hydrogen Peroxide
Hydrogen-Ion Concentration
Mass Spectrometry
Mutagens
Oxygen
Photochemistry
Reactive Oxygen Species
Singlet Oxygen
Solutions
Spectrometry, Fluorescence
Water
Photochemistry of norharmane in aqueous solution
topic_facet beta carboline
hydrogen peroxide
aqueous solution
article
atmosphere
high performance liquid chromatography
mass spectrometry
matrix assisted laser desorption ionization time of flight mass spectrometry
molecular stability
photochemistry
priority journal
quantum yield
thin layer chromatography
ultraviolet spectroscopy
Harmine
Hydrogen Peroxide
Hydrogen-Ion Concentration
Mass Spectrometry
Mutagens
Oxygen
Photochemistry
Reactive Oxygen Species
Singlet Oxygen
Solutions
Spectrometry, Fluorescence
Water
description The photochemistry of norharmane (9H-pyrido[3,4-b]indole) in acidic (pH 5.0 ± 0.1) and alkaline (pH 10.0 ± 0.1) aqueous solutions was studied. The photochemical reactions were monitored by TLC, UV/VIS absorption spectroscopy, high-performance liquid chromatography (HPLC), electronic ionization-mass spectrometry (EI-MS), UV-laser desorption/ionization-time of flight-mass spectrometry (UV-LDI-TOF-MS) and an enzymatic method for H 2O2 determination. The neutral (nHoN) and the protonated (nHoH+) forms of norharmane irradiated under Ar atmosphere were photostable, but they suffered a photochemical transformation in the presence of O2, yielding as photoproducts norharmane dimers, trimers and tetramers. nHoN shown to be more photostable than nHoH+. The nHoH+ and nHoN consumption quantum yields were 1.82 × 10 -3 and 0.51 × 10-3, respectively, and the mechanisms involved in its photochemistry are discussed. H2O2 and singlet oxygen (1O2) were also detected and quantified in irradiated solutions of norharmane, and their role in the photochemistry of norharmane is discussed. © 2009 The Royal Society of Chemistry and Owner Societies.
title Photochemistry of norharmane in aqueous solution
title_short Photochemistry of norharmane in aqueous solution
title_full Photochemistry of norharmane in aqueous solution
title_fullStr Photochemistry of norharmane in aqueous solution
title_full_unstemmed Photochemistry of norharmane in aqueous solution
title_sort photochemistry of norharmane in aqueous solution
publishDate 2009
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1474905X_v8_n8_p1139_Gonzalez
http://hdl.handle.net/20.500.12110/paper_1474905X_v8_n8_p1139_Gonzalez
_version_ 1768542708311261184