Determination of Diacetyl in Butter and Air Samples by SPME Coupled with GC-MS

A solid phase microextraction-gas chromatography-mass spectrometry method was developed to determine diacetyl in butter samples. The extraction was performed for 5 min at 37 A degrees C using a polydimethylsiloxane/divinyl benzene fiber. The method had a linear range of 0.024-11.2 ppm with limit of detection of 0.0078 ppm. Air sampling of diacetyl using solid phase microextraction was also developed to estimate diacetyl concentration in air. The extraction was performed by exposure of a polydimethylsiloxane fiber to air for 2 min. This method had linear range of 0.2-22 ppm (v/v) with limit of detection of 0.05 ppm.