Unlike the analysis in our previous work (Li et al., 2007, 2009), in order to separate the EtOH and MeOH signals, generated by large concentration differences but similar retention times, the GC con- ditions had to be selected carefully. Fig. 1 shows a GC chro- matogram of the FE HS-GC analysis of a wine sample under the selected conditions. Fig. 1a is an enlargement of Fig. 1b and shows that some minor volatile species (including MeOH) were well sepa- rated from EtOH under these conditions. Clearly, EtOH is the domi- nant species in the vapor phase due to its high content in the sample. Although MeOH is a minor component in wines, the GC detector (FID) is sufficiently sensitive to quantify its content using the FE HS-GC method.