Abstract:

A method for the quantification of two odor components, dimethyl disulfide (DMDS) and dimethyl trisulfide
(DMTS), in Chinese liquor using headspace solid-phase micro extraction (SPME) coupled with gas chromatography-mass
spectrometry (GC-MS) was established. Results indicated that the optimal pretreatment conditions were determined as
follows: 100 μm PDMS extraction fiber, 20 min extraction at 50 ℃ after addition of 1.5 g of NaCl, and 5.0 min desorption.
The linear correlation coefficients for DMDS and DMTS were 0.999 1 and 0.999 5, respectively, and the limits of detection
were 0.04 and 0.06 μg/L, respectively, with relative standard deviation (RSD) less than 3.98%. The average recovery
rates for spiked samples were between 93.17% and 112.07%. The method established in the study is applicable to the
determination of DMDS and DMTS in Chinese liquor.

Key words: Chinese liquor, gas chromatography-mass spectrometry, headspace solid-phase micro extraction, dimethyl disulfide , dimethyl trisulfide