Yes. After checking the Varian 450-GC and Combi PAL autosampler system, I decided to use headspace method. The Combi PAL is equipped with a heater+agitator which would apparently force all the volatile components into the gas phase and I only need to have an internal standard to do headspace. It should be working well.
Thanks everybody!

Natalie
Since we are talking about fermentation broths here, which can vary from consomme to chunky vegetable depending on how well the bugs grow,
You centrifuge the sample and filter the supernate and then test that by headspace.
I am more optimistic than Rod about acetic acid by GC. The lower limits will be higher than for the alcohols, and the repeatability not as good, but much will depend on the concentrations that you need to get down to. You will need to lower the pH with a strong acid, and that might give some issues with hydrolysis of other components.
I know from experience that works and that hydrolysis is not an issue, at least if the HS oven is in the 60-70C range and you don't have to equilbrate too long (which depends in part on the volume and vial size you use.

- Karen