The electronic nose system (FOX 3000, Alpha MOS, Toulouse, France) is equipped with 12 metal oxide gas sensors (MOS sensors) based on different sensing materials. Gas sensors are located in two temperature controlled chambers within high temperature and zero humidity and a purified air generator is used to provide carrier gas for cleaning sensors. The sensors array comprised of LY, P and T type sensors. Sensor response is recorded by Alpha Soft v.12 software (Alpha MOS, Toulouse, France). The sampling conditions (quantity, volume, temperature and headspace generating time) are optimized previously in order to decide the optimum conditions and improve sensor performance.