title: Chemical composition of propolis from Canada, its antiradical activity and plant origin.
abstract: The chemical composition of propolis from two regions in Canada was studied: Boreal forest and the Pacific coastal forest that lie outside the area of distribution of Aigeiros poplars, the usual propolis source plants. In the sample from Victoria, p-hydroxyacetophenone, benzyl hydroxybenzoate and cinnamic acid were the major components, accompanied by significant amounts of dihydrochalcones, which allowed the identification of its plant source: Populus trichocarpa of section Tacamahaca. Three dihydrochalcones were new for propolis. The sample from Richmond was characterized by large amounts of p-coumaric and cinnamic acid, typical for poplars of section Leuce, subsection Trepidae, its plant source was identified as P. tremuloides. Both samples showed a good radical scavenging activity against DPPH. Obviously, the Northern type propolis is a promising potential source of biologically active substances and deserves further investigation.
authors.affiliation: Regional Center for Mass Spectrometry, Department of Chemistry, University of Montreal, Quebec, Canada.
authors.forename: Roumen
authors.initials: R
authors.lastname: Christov
authors.forename: Boryana
authors.initials: B
authors.lastname: Trusheva
authors.forename: Milena
authors.initials: M
authors.lastname: Popova
authors.forename: Vassya
authors.initials: V
authors.lastname: Bankova
authors.forename: Michel
authors.initials: M
authors.lastname: Bertrand
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry; D002170:Canada; D002934:Cinnamates / Q000737:chemistry; D016166:Free Radical Scavengers / Q000737:chemistry*; D011429:Propolis / Q000737:chemistry*
chemical_list: D000890:Anti-Infective Agents; D002934:Cinnamates; D016166:Free Radical Scavengers; C029010:cinnamic acid; D011429:Propolis