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This paper reports a full evaporation (FE) headspace gas chromatographic (HS-GC) method for rapid determination of ethanol in sugar beet fermentation liquid. In this method, a very small volume,10 µL of sugar beet fermentation liquid sample is introduced into a headspace sample vial and heated up to a temperature of 105 ºC, when a full evaporation can be achieved within 3 min. The ethanol in the headspace of the vial is then measured by GC-FID. The full evaporation technique showed a good reproducibility, with a relative standard deviation less than 2.54% for six measurements. The method was verified by using spiked fermentation samples with different volumes of standard ethanol solution when ethanol concentrations were determined together with their corresponding confidence intervals, the relative standard deviations and the recovery degrees. The relative standard deviations ranged from 1.18% to 2.59% and the recovery degrees ranged from 88.7% to 92.6%. The present method is simple, rapid and requires no sample pretreatment.

Keywords: ethanol, sugar beet fermentation liquid, full evaporation headspac