ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Constituents of propolis of Czechoslovak origin V.
M. Nagy, V. Suchý, D. Uhrín, K. Ubik, M. Buděšinský, and D. Grančai
Department of Pharmacognosy and Botany, Faculty of Pharmacy,
Comenius University, CS-832 32 Bratislava
Abstract: The ethanolic extract of crude propolis was divided into five fractions by
treatment with mutually immiscible solvents, namely into the interphase,
and methanolic, ethyl acetate, light petroleum, and aqueous portions.
Separation of the interphase afforded a new flavonoid — 3,7-dihydroxy-5-methoxyflavone (galangin 5-methyl ether), whilst the methanolic portion
furnished (2R,3R )-3,7-dihydroxy-5-methoxyflavanone
(pinobanksin 5-methyl ether), and (2E,4E)-5-phenyl-2,4-pentadienoic acid (cinnamylideneacetic acid). Structure of these products was determined by spectral means.
Full paper in Portable Document Format: 425a691.pdf
Chemical Papers 42 (5) 691–696 (1988)