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Preparative enzymatic synthesis of glucuronides of zearalenone and five of its metabolites

Stevenson DE, Hansen RP, Loader JI, Jensen DJ, Cooney JM, Wilkins AL, Miles CO. Preparative enzymatic synthesis of glucuronides of zearalenone and five of its metabolites. Journal of Agricultural and Food Chemistry 2008,56 (11), 4032–4038.

The resorcylic acid lactones zearalenone (1), α-zearalenol (2), β-zearalenol (3), α-zearalanol (zeranol) (4), β-zearalanol (taleranol) (5), and zearalanone (6) were converted to their glucuronides on a preparative scale in good yields. Reactions were conducted with bovine uridine 5′-diphosphoglucuronyl transferase (UDPGT) as catalyst and uridine 5′-diphosphoglucuronic acid (UDPGA) as cofactor. The glucuronides were isolated by column chromatography and characterized by NMR spectroscopy and mass spectrometry. Although the principal products were 4-O-glucuronides (i.e., linkage through a phenolic hydroxyl), significant quantities of the 6′-O-glucuronides (i.e., linkage through the aliphatic hydroxyl) of alcohols 2, 4, and 5 were also isolated. In the case of 3, the 2-O-glucuronide was isolated as the minor product. Overall isolated yields of glucuronides, performed on a 20−50 mg scale, were typically ca. 80% based on the resorcylic acid lactone starting material. LC-UV-MS2analysis of purified specimens revealed MS2 fragmentations useful for defining the point of attachment of the glucuronide moiety to the zearalenone nucleus.

NVI authors

Wilkins Alistair

Gjesteforsker