POLYPHENOLIC COMPOSITION OF WOOD EXTRACTS FROM EUCALYPTUS-CAMALDULENSIS, EUCALYPTUS-GLOBULUS AND E-RUDIS

Polyphenolic composition (flavonoids and phenolic acids and aldehydes) is studied in the ether soluble fractions of the methanolic extracts of Eucalyptus camaldulensis, E. globulus and E. rudis wood. HPLC, TLC and GC/MS are employed for compound identification. Gallic, vanillic a nd ellagic acids; vanillin, syringaldehyde and sinapaldehyde; naringen in and quercetin were identified. Some flavonols, flavanones and ellag itannins were also recognized. Chemical assays for wood characterizati on were carried out according to Tappi Test Methods. The differences i n polyphenolic composition among the three species seem not to justify their different aptitude as pulping raw material, described in litera ture.