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- W2082890705 abstract "Steady-state and time-resolved spectroscopies are used to elucidate the primary photoprocesses following the excitation of ochratoxin A (OTA), its dechlorinated derivative ochratoxin B (OTB), and O-methyl ether of OTA (MOA). The excited-state dynamics of OTA and OTB depend on the protonation of the isocoumarin moiety. Fluorescence spectra of the protonated forms reveal anomalously large Stokes shifts that are attributed to the enol tautomer formed via an intramolecular excited-state proton transfer. No evidence for “normal” emission of the keto form of OTA and OTB is found even in aqueous solutions. MOA, which lacks a proton on the phenol moiety and exists, therefore, only in the keto form, exhibits weak fluorescence with a substantially smaller Stokes shift. The deprotonated species show relatively strong emission typical for phenolate anions. OTA decomposes slowly upon UV irradiation in aqueous solutions. The photoreaction quantum yield varies significantly with solution pH and O2 concentration. The hig..." @default.
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- W2082890705 date "2001-10-20" @default.
- W2082890705 modified "2023-10-18" @default.
- W2082890705 title "The pH-Dependent Primary Photoreactions of Ochratoxin A" @default.
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- W2082890705 doi "https://doi.org/10.1021/jp012683q" @default.
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