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“DELTA RESIN,” A WATER‐SOLUBLE, BITTER, BACTERIOSTATIC PORTION OF THE RESIN OF HOPS
Author(s) -
Walker T. K.,
Zakomorny M.,
Blakebrough N.
Publication year - 1952
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.2050-0416.1952.tb06194.x
Subject(s) - chemistry , acetone , methanol , aqueous solution , ethanol , petroleum ether , benzene , ether , organic chemistry , chromatography , extraction (chemistry)
When humulone is heated at 98–100° C. in a stream of oxygen, it is gradually converted to resinous material which is soluble in water, ether, methanol, ethanol and acetone, but insoluble in light petroleum and in benzene. The aqueous solution of this resin has a pleasant bitter taste and yields a lead salt when mixed with an aqueous solution of lead acetate. If an ethereal extract of hops is shaken with water and the aqueous extract is evaporated under reduced pressure at about 45° C., there remains a bitter resin which is bacteriostatic towards lactobacilli. This resin is soluble in ether, methanol, ethanol and acetone; it is insoluble in light petroleum and in benzene. It has been named δ‐resin. It forms a lead compound with lead acetate in aqueous solution and in methanol. It thus has a number of properties similar to those exhibited by the resin obtained by heating humulone at 100° C. in oxygen. Only small yields of δ‐resin were obtained from new hops; greater yields were obtained from old hops.