Abstract
Reasonably satisfactory methods exist for the analysis of α acids in hops. The analysis of iso α acids in beer is not so well developed. The same determinations for hop extracts and isomerized hop extracts are much more difficult. A new method for these determinations is now described. It is based on a chromatographic technique using buffered paper strips and is applicable not only to hop extracts, isomerized or not, but also to hops and to beer. The percentage of α acids and iso α acids can be determined in one analysis. Eventually the determination of humulinic aci ds β acids and hulupones will also be possible. After separating these substances from one another their amounts are determined spectrophotometrically. The method is very fast and is more accurate than any other known method.
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