Chinese researchers investigated the contamination source for butyltin compounds found in wine and identified agglomerated cork stoppers as a contamination source.
Speciation analysis was performed by using a leaching procedure followed by Grignard derivatization and GC-FPD detection for cork samples and by hydride generation, SPME and GC-FPD for wine samples. Measurable concentrations of MBT, DBT and TBT were found in agglomerated cork stoppers but not in one-piece corks. It was shown that measurable amounts of butyltins are released from contaminated stoppers into the wine during bottle storage. The highest concentrations of butyltin compounds found in cork samples reached 13.1 µg Sn/g for MBT and 7.4 µg Sn/g for DBT. The highest concentrations in contaminated wine reached 5.7 µg of Sn/L for MBT, 33.2 µg Sn/L for DBT, and 13.6 µg Sn/L for TBT. Since some liquor samples and some wine samples with metallic caps also contained measurable amounts of organotin compounds, other potential contamination sources have to be taken into account.
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last time modified: June 18, 2020