title: Studies of the constituents of Uruguayan propolis.
abstract: Eighteen flavonoids including two new compounds, four aromatic carboxylic acids, and eleven phenolic acid esters including one new compound were isolated and identified from the ethyl acetate soluble fraction of the 70% ethanol extract of Uruguayan propolis. The new compounds were elucidated as pinobanksin 3-(2-methyl)butyrate (1; recently reported in Usia, T.; Banskota, A. H.; Tezuka, Y.; Midorikawa, K.; Matsushige, K.; Kadota, S. J. Nat. Prod. 2002, 65, 673-676) pinobanksin 3-isobutyrate (2), and 2-methyl-2-butenyl ferulate (24). The constituents isolated from Uruguayan propolis in this study were similar to those of propolis of European and Chinese origin. Thus, it is suggested that the Uruguayan propolis has a plant origin similar to those of propolis from Europe and China.
authors.affiliation: School of Food and Nutritional Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526, Japan. kumazawa@smail.u-shizuoka-ken.ac.jp
authors.forename: Shigenori
authors.initials: S
authors.lastname: Kumazawa
authors.forename: Katsumi
authors.initials: K
authors.lastname: Hayashi
authors.forename: Katsuko
authors.initials: K
authors.lastname: Kajiya
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ishii
authors.forename: Tomoko
authors.initials: T
authors.lastname: Hamasaka
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Nakayama
mesh_terms: D000085:Acetates; D000890:Anti-Infective Agents / Q000032:analysis* / Q000737:chemistry; D002264:Carboxylic Acids / Q000032:analysis; D002851:Chromatography, High Pressure Liquid; D000431:Ethanol; D044950:Flavanones; D005419:Flavonoids / Q000032:analysis* / Q000737:chemistry; D010636:Phenols / Q000032:analysis; D011429:Propolis / Q000737:chemistry*; D012995:Solubility; D016339:Spectrometry, Mass, Fast Atom Bombardment; D014583:Uruguay
chemical_list: D000085:Acetates; D000890:Anti-Infective Agents; D002264:Carboxylic Acids; D044950:Flavanones; D005419:Flavonoids; D010636:Phenols; D000431:Ethanol; C108261:pinobanksin; C007650:ethyl acetate; D011429:Propolis