Survey of Butyltin, Cyclohexyltin, and Phenyltin Compounds in Canadian Wines

Abstract

Abstract Butyltin, cyclohexyltin, and phenyltin compounds were extracted with 0.05% tropolone in pentane from enzymatically hydrolyzed wine samples. Methyl derivatives made by Grignard reaction were quantitated by gas chromatography (GC)/atomic absorption spectrometry (AAS). Wine samples contained <0.1-138 ng dibutyltin/mL. Lower levels of monobutyl- and tributyltin were also detected by GC/AAS. Polyvinyl chloride) (PVC) liner material used in some commercial transport tanks contained extractable butyltins. Imported wines sampled from these containers and Canadian wines blended with wine imported in PVC-lined tanks had considerably higher butyltin levels than did wines shipped in stainless steel. Analysis by GC/mass spectrometry confirmed the presence of butyltins in wine and PVC liner samples and, in addition, detected monophenyl- and monocyclohexyltin compounds at levels below the GC/AAS method detection limits of 0.04-0.05 ng Sn/mL