abstract
The chemical composition of the lipophilic extracts of the inner and outer bark fractions of Eucalyptus grandis and Eucalyptus urograndis (E. grandis x Eucalyptus urophylla) cultivated in Brazil and Eucalyptus maidenii, cultivated in Portugal was studied by gas chromatography-mass spectrometry. The extracts were shown to be mainly composed of triterpenic compounds (along with mono and sesquiterpenes in E. maidenii) followed smaller amounts of fatty acids, fatty alcohols, and aromatic compounds. Triterpenic acids (mainly ursolic, betulinic and oleanolic acids), are particularly abundant in outer barks representing 5.2 g/kg, 5.7 g/kg and 9.3 g/kg in E. urograndis, E. grandis and E. maidenii outer barks, respectively. Although these compounds were found in considerably smaller amounts than those previously reported for Eucalyptus globulus, the total amounts of bark generated every year in South American pulp mills using E. urograndis and E. grandis, as well as the growth potential of E. maidenii plantations, the bark residues from these species are obvious candidates for the extraction of valuable triterpenic compounds. (C) 2010 Elsevier B.V. All rights reserved.
keywords
CHROMATOGRAPHY-MASS SPECTROMETRY; BIOACTIVE PHENOLIC SUBSTANCES; CHEMICAL-COMPOSITION; LIPOPHILIC EXTRACTIVES; GAS-CHROMATOGRAPHY; GLOBULUS LABILL; OLEANOLIC ACID; URSOLIC ACID; KRAFT PULPS; WOOD
subject category
Agriculture
authors
Domingues, RMA; Sousa, GDA; Silva, CM; Freire, CSR; Silvestre, AJD; Neto, CP
our authors
Armando Jorge Domingues Silvestre
Full professor
Carlos Manuel Silva
Associate Professor
Carlos Pascoal Neto
Raiz Director
Carmen Sofia da Rocha Freire Barros
Coordinating Researcheracknowledgements
The authors are grateful to BIIPP project (QREN 11551) and to AFORE Project (European Community's Seventh Framework Programme FP7/2007-2013 under grant agreement no CP-IP 228589-2 AFORE).