Determination of alcohol in purple yam low-alcohol fermented beverage by gas chromatography

A method for gas chromatography determinnation of alcohol content in purple yam low-alcohol femented beverages was reported in this paper. The samples were separated on HP- INNOWAX ( 30m × 0.25mm × 25μm) capillary column.Methanol was chosen as the diluent and the n- propanol was used as the standard substance. Results showed that the peak time of methanol, ethanol and n- propanol was 2.909, 3.110 and 3.846min, respectively.And the degree of separation for ethanol and n- propanol was more than 30. The linear range was 0.2⁶.0mg /mL with a correlation of 0.9996, and the detection limits were 0.05mg /mL for alcohol in purple yam. Recoveries varied from 94.4% ¹07.4%, and the relative standard deviation ( RSD) of the repetitive experimental was 4.23%. This method developed could be used to detect alcohol content in purple yam low- aocohol femented beverages.