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Polyphenolic composition of bark extracts fromEucalyptus camaldulensis, E. globulus andE. rudis

Polyphenol-Zusammensetzung der Rinde von E. camaldulensis, E. globulus und E. rudis

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Abstract

Polyphenolic composition (flavonoids and phenolic acids and aldehydes) is studied in the Et2O soluble fractions of the methanolic extracts ofEucalyptus camaldulensis, E. globulus andE. rudis bark. Gallic, protocatechuic, vanillic and ellagic acids, and protocatechuic aldehyde were identified in the three species; eriodictyol, quercetin and naringenin, inE. camaldulensis andE. globulus; vanillin, inE. camaldulensis andE. rudis; naringin, quercitrin, luteolin and kaempferol, inE. camaldulensis; taxifolin and apigenin, inE. globulus; and methyl benzoates and cinnamates, inE. rudis. Some unidentified ellagitannins, flavonols and flavanones were also detected. Significant differences in composition among species were found:E. rudis showed the lowest concentration in flavonoids andE. globulus presented higher concentration and variety of ellagitannins than the others.

Zusammenfassung

Die in Ethylether und Methanol löslichen Extrakte der Rinde von drei Eukalyptusarten wurde hinsichtlich ihre Polyphenolanteile untersucht (Flavanoide, phenolische Säuren und Aldehyde). In allen drei Arten wurden Gallussäure, Protocatechusäure, Vanillinsäure und Ellagsäure identifiziert. Eriodictyol, Quercitin und Naringenin fanden sich inE. camaldulensis undE. globulus, Vanillin inE. camaldulensis undE. rudis. Naringin, Quercitrin, Luteolin und Kampher wurden inE. camaldulensis identifiziert, Taxifolin und Apigenin inE. globulus. Benzoate und Cinnamate wurden inE. rudis entdeckt. Weiterhin wurden einige noch nicht identifizierte Ellagitannine, Flavanole und Flavanone gefunden. Charakteristische Unterschiede zwischen den Arten ware folgende:E. rudis zeigt die niedrigste Konzentration an Flavonoiden;E. globulus weist höhere Konzentrationen und größere Variationen der Ellagitannine auf.

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Authors and Affiliations

  1. Area Industrias Forestales, CIFOR-INIA, Apdo. 8111, 28080, Madrid, Spain

    E. Conde, E. Cadahia, R. Diez-Barra & M. C. García-Vallejo

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  1. E. Conde
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  2. E. Cadahia
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  3. R. Diez-Barra
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  4. M. C. García-Vallejo
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Conde, E., Cadahia, E., Diez-Barra, R. et al. Polyphenolic composition of bark extracts fromEucalyptus camaldulensis, E. globulus andE. rudis . Holz als Roh-und Werkstoff 54, 175–181 (1996). https://doi.org/10.1007/s001070050162

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