[Determination of methanol and fusel oils in alcohol beverages using headspace solid-phase microextraction and gas chromatography].

A method for the determination of methanol and fusel oils in alcohol beverages using headspace solid-phase microextraction and gas chromatography (HS-SPME-GC) is presented. The solid phase was a coated epoxy resin. The extraction and chromatography conditions were optimized. Limits of detection were 0.02 mg/L-0.04 mg/L and relative standard deviations were in the range of 1.4%-4.1%. The proposed method showed better sensitivity in comparing with direct headspace gas chromatography(HS-GC, the National Standard method). This method was applied to evaluate real samples. The spiked recoveries in beer, wine and functional alcohol samples ranged from 80.8% to 110.3% for methanol and fusel oils. The results by HS-SPME-GC and HS-GC for alcohol samples coincided very well. The proposed method is simple, fast and accurate with high reproducibility, high sensitivity and low cost. It extends the applications of SPME.