Polyphenolic composition of bark extracts fromEucalyptus camaldulensis, E. globulusandE. rudis

Polyphenolic composition (flavonoids and phenolic acids and aldehydes) is studied in the Et2O soluble fractions of the methanolic extracts ofEucalyptus camaldulensis, E. globulusandE. rudisbark. Gallic, protocatechuic, vanillic and ellagic acids, and protocatechuic aldehyde were identified in the three species; eriodictyol, quercetin and naringenin, inE. camaldulensisandE. globulus; vanillin, inE. camaldulensisandE. 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. rudisshowed the lowest concentration in flavonoids andE. globuluspresented higher concentration and variety of ellagitannins than the others.