Articles
AGRONOMIC AND NUTRACEUTICAL POTENTIAL OF HOPS (HUMULUS LUPULUS L.) GROWN IN QUÉBEC, CANADA
Article number
1010_18
Pages
155 – 161
Language
English
Abstract
Hop (Humulus lupulus L.) is a dioecious plant cultivated in most temperate areas of the world, mainly for its inflorescences known as hop cones.
Hop cones contain hop bitter acids (α- and β-acids), and polyphenols such as prenylated chalcones and proanthocyanidins.
Hop leaf may also contain polyphenols.
The present work was conducted to determine the yield and the content of α- and β-acids, desmethylxanthohumol, xanthohumol and proanthocyanidins in cones and leaves of 5 cultivars (Cascade, Galena, Nugget, Willamette and Brewers Gold) grown in Québec, Canada.
Cones, leaves and stems of each plant were separated to measure fresh and dry weights of each part. α- and β-acids, desmethylxanthohumol and xanthohumol, proanthocyanidins and total polyphenols in the leaves and cones of the different cultivars were determined.
Our data showed that Nugget had the lowest cone yield (113.5 g of dry cones/plant) and Galena had the highest (603.5 g of dry cones/plant). Cones of Nugget had the highest concentration of α-acids (10.8% DM), proanthocyanidins (1.7% DM) and total polyphenols (4.6% DM) whereas cones of Galena had the highest content of β-acids (6.7% DM) while cones of Brewers Gold had the highest concentration of xanthohumol (0.6% DM). Leaves of Nugget had the highest concentration of α-acids (0.09% DM), while those of Galena had the highest content of proanthocyanidins (1.1% DM) and total polyphenols (3.18% DM). Leaves of Brewers Gold had the highest concentration of xanthohumol (0.014% DM). No correlation was found between yield of cones and cones and leaves polyphenol content.
Moreover, hop leaf contained small amounts of xanthohumol, α- and β-acids but higher amounts of proanthocyanidins and total polyphenols.
Hop cones contain hop bitter acids (α- and β-acids), and polyphenols such as prenylated chalcones and proanthocyanidins.
Hop leaf may also contain polyphenols.
The present work was conducted to determine the yield and the content of α- and β-acids, desmethylxanthohumol, xanthohumol and proanthocyanidins in cones and leaves of 5 cultivars (Cascade, Galena, Nugget, Willamette and Brewers Gold) grown in Québec, Canada.
Cones, leaves and stems of each plant were separated to measure fresh and dry weights of each part. α- and β-acids, desmethylxanthohumol and xanthohumol, proanthocyanidins and total polyphenols in the leaves and cones of the different cultivars were determined.
Our data showed that Nugget had the lowest cone yield (113.5 g of dry cones/plant) and Galena had the highest (603.5 g of dry cones/plant). Cones of Nugget had the highest concentration of α-acids (10.8% DM), proanthocyanidins (1.7% DM) and total polyphenols (4.6% DM) whereas cones of Galena had the highest content of β-acids (6.7% DM) while cones of Brewers Gold had the highest concentration of xanthohumol (0.6% DM). Leaves of Nugget had the highest concentration of α-acids (0.09% DM), while those of Galena had the highest content of proanthocyanidins (1.1% DM) and total polyphenols (3.18% DM). Leaves of Brewers Gold had the highest concentration of xanthohumol (0.014% DM). No correlation was found between yield of cones and cones and leaves polyphenol content.
Moreover, hop leaf contained small amounts of xanthohumol, α- and β-acids but higher amounts of proanthocyanidins and total polyphenols.
Publication
Authors
C. Sarraf, Y. Desjardins, S. Leonhart, A. Gosselin , G. Gosselin
Keywords
xanthohumol, α-acids, β-acids, proanthocyanidins, total polyphenols, cones, leaves
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