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Sulfoglucosides as Novel Modified Forms of the Mycotoxins Alternariol and Alternariol Monomethyl Ether

Soukup, Sebastian T.; Kohn, Beate N.; Pfeiffer, Erika; Geisen, Rolf; Metzler, Manfred; Bunzel, Mirko; Kulling, Sabine E.

Abstract (englisch):
The mycotoxins alternariol and alternariol-9-O-methyl ether have recently been reported to be extensively conjugated with glucose and malonyl glucose in tobacco suspension cells. However, only trace amounts of glucosylated conjugates were detected in tomatoes inoculated with Alternaria alternata in the present study. Instead, mostly sulfate conjugates were observed. In studies using cultures of A. alternata and incubations of alternariol and alternariol-9-O-methyl ether with tomato tissue in the absence of the fungus, it was clarified that sulfate conjugates were produced by the fungus, whereas tomato tissues converted alternariol and alternariol-9-O-methyl ether to glucosylated metabolites. Alternariol-3-sulfate, alternariol-9-sulfate, and alternariol-9-O-methyl ether-3-sulfate were unambiguously identified as fungal metabolites using MS and 1H and 13C NMR spectroscopy. When these sulfate conjugates were incubated with tobacco suspension cells or ex planta tomato tissues, three sulfoglucosides of alternariol and one sulfoglucoside of alternariol-9-O-methyl ether were formed. Using NMR spectroscopy, the chemical structures of altern ... mehr


Zugehörige Institution(en) am KIT Institut für Angewandte Biowissenschaften (IAB)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1021/acs.jafc.6b03120
ISSN: 0021-8561, 1520-5118
KITopen ID: 1000063138
Erschienen in Journal of agricultural and food chemistry
Band 64
Heft 46
Seiten 8892–8901
Schlagworte Alternaria toxins; masked mycotoxins; modified mycotoxins; sulfates; sulfoglucosides
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