title: Tannins from Hamamelis virginiana: identification of proanthocyanidins and hamamelitannin quantification in leaf, bark, and stem extracts.
abstract: The tannins in leaf, bark, and stem extracts of HAMAMELIS VIRGINIANA were analyzed. Four proanthocyanidins were isolated by HPLC. One was a procyanidin polymer containing only one type of flavanol unit; the other three were polymers of procyanidin and prodelphinidin containing two types of flavanol units. A method of assay of hamamelitannin showed the bark extract to be 31 times richer in hamamelitannin than the leaf extract and 87 times richer than the stem extract.
authors.affiliation: Laboratoire de Pharmacie Galénique et de Pharmacotechnie, Faculté de Pharmacie, Clermont-Ferrand Cedex, France.
authors.forename: B
authors.initials: B
authors.lastname: Vennat
authors.forename: H
authors.initials: H
authors.lastname: Pourrat
authors.forename: M P
authors.initials: MP
authors.lastname: Pouget
authors.forename: D
authors.initials: D
authors.lastname: Gross
authors.forename: A
authors.initials: A
authors.lastname: Pourrat