Abstract:The pretreatment method of headspace solid-phase microextraction（HS-SPME）and the technology of gas chromatography-mass spectrometry（GC-MS）was applied to analysis the aroma compositions in extruded brown rice.This study was carried out to find the optimum extraction conditions for extruded brown rice aromatic substances.The extraction was used by the extraction fiber of divinylbenzene/carboxen/polydimethylsiloxane（DVB/CAR/PDMS），through single factor experiments，the initial optimization conditions for the ratio of material to liquid （saturated sodium chloride solution），extraction temperature，equilibrium time and adsorption time were determined.Then response surface analysis was further used to explore the influence of extraction temperature，equilibrium time and adsorption time on the total peak area of total ion chromatogram of aromatic substances in extruded brown rice.The optimal conditions for extraction aromatic substances by HS-SPME were as follows：extraction temperature was 51.11℃，equilibrium time was 19.94 min，adsorption time was 43.99 min.Considering the actual operation，optimum extraction conditions were determined as the weight of the sample of 3.0 g，the ratio of material to liquid was 1∶7 （g/mL），the extraction temperature of 51℃，the equilibrium time of 20 min，and the adsorption time of 44 min.Under this conditions，the total peak area of total ion chromatogram of aromatic substances was 3.215×108and the relative error with the predicted value was 0.78%，which was higher than the maximum value of 3.157×108in the single factor experiments.It showed that the extraction parameters are reasonable and feasible，and have practical value，which is conducive to further qualitative and quantitative analysis of aroma substances in extruded brown rice.