ION-EXCHANGE CHROMATOGRAPHY OF HOP RESINS AND ITS APPLICATION TO THE PREPARATION OF EXTRACTS FOR BITTERING BEER

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Abstract
Substantial quantities of the acidic components of hop resins are adsorbed from solution in organic solvents by basic ion-exchange resins from which they may be eluted in various groups, including the α and β acids, by means of aqueous methanolic acetic acid. Similar chromatography of the hard resin of hops reveals xanthohumol together with other flavone derivatives. Alternatively, the hop acids may be desorbed from basic ion-exchange resins by aqueous methanolic sodium chloride. The mixture of compounds thus obtained has been converted by treatment with alkali into a preparation of iso-compounds which has been used successfully to bitter unhopped beer with excellent over-all utilization of the hop resins.* 1 Certain of the processes described here form the subject of a patent application in the names of Brewing Patents Ltd., and G. A. Howard.

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