Lupulin


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Related to Lupulin: hops
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Lupulin

the commercial name for the glandules on the glumes of the fruit system (cones) and perianth of female hop blossoms (Humulus lupulus); also, the secretion from these glandules.

Solidified lupulin is a brownish yellow, sticky, coarse-grained powder containing essential oil, bitters, the alkaloid humulene, humulotannic acid, valerianic acid, gum, resin, wax, and a yellow pigment. Lupulin is used in brewing to give beer a pleasant, slightly bitter flavor, but it can also be toxic. A dose of 1-2 g may be mildly poisonous.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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A mixture of prenylated, geranylated, oxidized, and/or cyclized chalcones, of which 30 have been isolated to date, is secreted by the lupulin glands along with the bitter acids and volatile oils (Milligan et al., 1999; Mizobuchi and Sato, 1994; Stevens et al., 1997, 1999a, b, 2000; Zuurbier et al., 1998).
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