resumo
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.
palavras-chave
CHROMATOGRAPHY-MASS SPECTROMETRY; BIOACTIVE PHENOLIC SUBSTANCES; CHEMICAL-COMPOSITION; LIPOPHILIC EXTRACTIVES; GAS-CHROMATOGRAPHY; GLOBULUS LABILL; OLEANOLIC ACID; URSOLIC ACID; KRAFT PULPS; WOOD
categoria
Agriculture
autores
Domingues, RMA; Sousa, GDA; Silva, CM; Freire, CSR; Silvestre, AJD; Neto, CP
nossos autores
Armando Jorge Domingues Silvestre
Professor Catedrático
Carlos Manuel Silva
Professor associado
Carlos Pascoal Neto
Diretor do Raiz
Carmen Sofia da Rocha Freire Barros
Investigador Coordenadoragradecimentos
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).