Nucleophilic Addition of Thiols to Deoxynivalenol
Stanic, Ana; Uhlig, Silvio; Solhaug, Anita; Rise, Frode; Wilkins, Alistair Lawrence; Miles, Christopher Owen
Peer reviewed, Journal article
Published version
Permanent lenke
https://hdl.handle.net/11250/3151356Utgivelsesdato
2015Metadata
Vis full innførselSamlinger
Originalversjon
Journal of Agricultural and Food Chemistry. 2015, 63 (34), 7556-7566. 10.1021/acs.jafc.5b02864Sammendrag
Conjugation of deoxynivalenol (DON) with sulfur compounds is recognized as a significant reaction pathway, and putative DON–glutathione (DON–GSH) conjugates have been reported in planta. To understand and control the reaction of trichothecenes with biologically important thiols, we studied the reaction of DON, T-2 tetraol, and de-epoxy-DON with a range of model thiols. Reaction conditions were optimized for DON with 2-mercaptoethanol. Major reaction products were identified using HRMS and NMR spectroscopy. The results indicate that thiols react reversibly with the double bond (Michael addition) and irreversibly with the epoxide group in trichothecenes. These reactions occurred at different rates, and multiple isomers were produced including diconjugated forms. LC-MS analyses indicated that glutathione and cysteine reacted with DON in a similar manner to the model thiols. In contrast to DON, none of the tested mercaptoethanol adducts displayed toxicity in human monocytes or induced pro-inflammatory cytokines in human macrophages. Nucleophilic Addition of Thiols to Deoxynivalenol