Intestinal hydrolysis and microbial biotransformation of diacetoxyscirpenol-α-glucoside, HT-2-β-glucoside and N-(1-deoxy-d-fructos-1-yl) fumonisin B1 by human gut microbiota in vitro

Noshin Daud, Valerie Currie, Gary Duncan, Mark Busman, Silvia W. Gratz* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Fusarium mycotoxins are common contaminants in cereals and often co-occur with plant-derived mycotoxin sugar conjugates. Several of these modified mycotoxins are not degraded in the small intestine and hence carried through to the large intestine where microbial transformation may occur. This study aims to assess the gastrointestinal stability of the trichothecenes HT-2 toxin (HT-2), HT-2-β-glucoside (HT-2-Glc), diacetoxyscirpenol (DAS), DAS-α-glucoside (DAS-Glc) and fumonisin B1 (FB1), N-(1-deoxy-d-fructos-1-yl) fumonisin-B1 (NDF-FB1). All tested modified mycotoxins were stable under upper gastrointestinal (GI) conditions. In faecal batch culture experiments, HT-2-Glc was hydrolysed efficiently and no further microbial biotransformation of HT-2 was observed. DAS-Glc hydrolysis was slow and DAS was de-acetylated to 15-monoacetoxyscripenol. NDF-FB1 was hydrolysed at the slowest rate and FB1 accumulation varied between donor samples. Our results demonstrate that all tested modified mycotoxins are stable in the upper GI tract and efficiently hydrolysed by human gut microbiota, thus potentially contributing to colonic toxicity. Hence the microbial biotransformation of any novel modified mycotoxins needs to be carefully evaluated.
Original languageEnglish
Number of pages9
JournalInternational Journal of Food Sciences and Nutrition
Early online date3 Dec 2019
DOIs
Publication statusE-pub ahead of print - 3 Dec 2019

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Keywords

  • Diacetoxyscirpenol-α-glucoside
  • HT-2-β-glucoside
  • N-(1-deoxy-d-fructos-1-yl) fumonisin B1
  • human faecal microbiota
  • masked mycotoxins
  • release
  • APPROPRIATENESS
  • DEOXYNIVALENOL-3-GLUCOSIDE
  • STABILITY
  • FUSARIUM
  • FATE
  • HT-2-beta-glucoside
  • Diacetoxyscirpenol-alpha-glucoside
  • TRICHOTHECENE MYCOTOXINS
  • GUIDANCE VALUE
  • METABOLISM
  • MASKED MYCOTOXINS
  • T-2 TOXIN

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