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FURTHER OBSERVATIONS ON THE δ‐RESIN OF HOPS AND A METHOD FOR ITS ESTIMATION
Author(s) -
Abson J. W.,
Saleh M. S. E.,
Walker T. K.
Publication year - 1954
Publication title -
journal of the institute of brewing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.523
H-Index - 51
eISSN - 2050-0416
pISSN - 0046-9750
DOI - 10.1002/j.2050-0416.1954.tb02746.x
Subject(s) - hop (telecommunications) , extraction (chemistry) , ion exchange resin , chemistry , chromatography , precipitation , organic chemistry , computer science , meteorology , computer network , physics
δ‐Resin of hops partially inhibits the precipitation of α‐soft resin by lead acetate, but extraction with cold water of an ether solution of the total resin removes the greater part of the δ‐resin and so facilitates subsequent isolation of the α‐soft resin as lead compounds. Thirteen different hop samples all contained δ‐resin, in amounts varying from about 0·6% in some three‐months old hops to about 4% in certain hops which had been stored in warehouse for periods of eighteen months to two years. A method for the assay of δ‐resin in hops is described.