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Comparative Study
Journal Article
Biotransformation of the mycotoxin enniatin B1 in pigs: A comparative in vitro and in vivo approach.
Food and Chemical Toxicology 2017 July
Enniatins (ENNs) are hexadepsipeptidic mycotoxins produced by Fusarium species. They occur in mg/kg levels in grain from Northern climate areas. Major ENNs such as ENN B and B1 have shown considerable cytotoxicity in different in vitro test systems. To adequately assess exposure and in vivo toxicity the toxicokinetic properties need to be investigated. The present study describes the metabolism of ENN B1 both in vitro and in vivo in pigs, comparing metabolites found in vitro in experiments with liver microsomes from different pig strains to those found in the plasma of pigs after single oral or intravenous application of ENN B1. Metabolites of hepatic biotransformation were tentatively identified and characterised by high performance liquid chromatography coupled to ion trap and high-resolution mass spectrometry, as well as chemical derivatisations. Kinetic parameters of metabolite formation and elimination were determined. Metabolite formation was higher when ENN B1 was absorbed from the gut compared to intravenous administration indicating pre-systemic metabolism of ENN B1 after oral uptake. The in vitro approach resulted in the detection of ten ENN B1 metabolites, while six were detected in in vivo samples. The putative ENN B1 metabolites were products of hydroxylation, carbonylation, carboxylation and oxidative demethylation reactions.
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