Originally posted by Billy_Bathgate
Those were fake BTG's BTW, not pharmacy ones...
But, if any var was in there AT ALL it would have shown. You would have seen a 3rd peak right up the middle around the 9.1-9.2 minute mark. Using that same solvent, and that same gas, Var would always show up at that spot. Reguardless of what else is in it. Thats one of the beauties of it.
Your right though, there are two different compounds. They happen to be the same MW formula, but they were isomers. Now I dont know if they were stereo-isomers (trans- and cis-), optical-isomers (r- and s-), constitutional isomers (different arrangements), or structural isomers (different geometry). I have a feeling they were optical though as they showed up very close on the UV spectra. I bet that is on the 5th page though.
Very unlikely to be optical isomers. To tell the differance between R and S isomers, a chiral column would have to be used, which is much more expensive than most GC columns. The two isomers in the chromatogram are more likely to be stereoisomers of androstendiol; probably epimers at the 17 position.
-Spidey
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