Epicuticular Flavonoids from Encelia (Asteraceae)

Peter Proksch; Ursula Politt; Eckhard Wollenweber; Victor Wray; Curtis Clark

doi:10.1055/s-2006-962543

Planta Medica, Inhaltsverzeichnis

Planta Med 1988; 54(6): 542-546
DOI: 10.1055/s-2006-962543

Papers

Epicuticular Flavonoids from Encelia (Asteraceae)

Peter Proksch¹ , Ursula Politt² , Eckhard Wollenweber³ , Victor Wray⁴ , Curtis Clark⁵

¹Institut für Pharmazeutische Biologie der Technischen Universität, Mendelssohnstr. 1, D-3300 Braunschweig, Federal Republic of Germany.
²Botanisches Institut der Universität zu Köln, Gyrhofstr. 15, D-5000 Köln 41, Federal Republic of Germany.
³Institut für Botanik der Technischen Hochschule Darmstadt, Schnittspahnstr. 3, D-6100 Darmstadt, Federal Republic of Germany.
⁴Gesellschaft für Biotechnologische Forschung mbH, Mascheroder Weg 1, D-3300 Braunschweig, Federal Republic of Germany.
⁵Biological Sciences, California State Polytechnic University, Pomona, California 91768, USA.

Abstract

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Abstract

Most of the species of the North American genus Encelia have been analysed for lipophilic flavonoids present as constituents of the resins secreted on the surfaces of leaves and stems. Thirty different flavonoids have been isolated and identified. The compounds included several new and unusual flavanones mainly based on pinocembrin, naringenin, and eriodictyol. The structural elucidation of these compounds by spectroscopic means is described. The flavonoid patterns are briefly discussed with regard to the systematics of Encelia.

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