Journal
PROCESS BIOCHEMISTRY
Volume 42, Issue 9, Pages 1279-1284Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.procbio.2007.06.002
Keywords
Irpex lacteus; reactive orange 16; degradation; dye intermediates; LC-MS; laccase
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The study focuses on the Reactive Orange 16 (RO16) degradation products obtained by fungal treatment of the dye. Eighty percent of dye decolorization was achieved within 24 h by Irpex lacteus cultures immobilized on polyurethane foam (PUF). Dye degradation products were investigated using LC-MS analysis. Three compounds were identified as the dye intermediates: 6-acetamido-3,4-dioxo-3,4-dihydronaphthalene-2-sulfonate (mlz 294), (E)-2-(4-acetamidophenyl)-1-carboxyethenesulfonate (mlz 284), and 4-(2-hydroxyethylsulfonyl)phenolate (m/z 201). Despite significant laccase activities detected in the fungal cultures, no backward polymerization of the reaction products resulting in recurrent colorization was observed after fungal treatment of the dye solution. (c) 2007 Elsevier Ltd. All rights reserved.
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