I have always wondered about this although I have not and do not currently grow hops. I have seen the question asked far too many times and the majority of replies give opinions to the original OP with replies such as too expensive, not worth your time, you have to bend over backwards to do such a thing etc… instead of keeping silent or providing useful info. I have always disagreed with these simple Simon responses and knew one day I would touch on a vendor that does it on the cheap.
Well Here we go:
http://www.brewlaboratory.com/?p=homeWith this discovery I may rethink growing hops and make a run at it now as it was kind of a wash to use homegrown hops and always have to wing it until I made approximate palette guesses at usage rates.
This was just one Company I found in a search unrelated to hops there must be others or Labs with HPLC that could do it for cheap also.