The determination of brominated flame retardants in food by liquid chromatography with tandem mass spectrometric detection: diastereoisomer specific hexabromocyclododecane and tetrabromobisphenol A

The levels of the brominated flame retardants (BFRs) hexabromocyclododecane (α, β and γHBCD diastereoisomers) and tetrabromobisphenol A (TBBPA) have been determined in two studies using liquid chromatography with tandem mass spectrometric detection (LC-MS/MS). The methodology developed was validated in-house and used to investigate the UK 2004 Total Diet Study (TDS) samples and shellfish (oysters, mussels and scallops) collected from Scotland. HBCD was detected in most samples, and in both studies the αHBCD diastereoisomer was generally the most abundant as opposed to the γ diastereoisomer that tends to dominate in environmental samples and manufactured products. It is reported that selective metabolism or biotransformation of the β and γ diastereoisomers may be taking place. TBBPA was not detected in any samples above the limit of detection, which was as low as 0.05 µg/kg. This may be because TBBPA, unlike HBCD, is chemically bonded to the polymer matrix during manufacture so is not readily available for leaching. The UK Committee on Toxicity of Chemicals in Food, Consumer Products and the Environment (COT) concluded that the concentrations of HBCD and TBBPA detected in the TDS study did not raise toxicological concerns and as levels in the shellfish samples were in the similar concentration range, it was concluded that exposure to the BFRs measured is not significant when compared to exposure from the rest of the diet.