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vol.15 número1VARIABILIDAD DE LAS PROPIEDADES FISICAS, MORFOLOGICAS Y TERMICAS DE LA FIBRA DE CORTEZA DE Eucalyptus nitensEFECTO DE UN ENVEJECIMIENTO ACELERADO MEDIANTE RAYOS UV EN LA PROPAGACIÓN SUPERFICIAL DE GRIETAS DE DEBOBINADO EN TABLEROS CONTRACHAPADOS DE Eucalyptus nitens índice de autoresíndice de assuntospesquisa de artigos
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Maderas. Ciencia y tecnología

versão On-line ISSN 0718-221X

Resumo

RAMOS, Valentina et al. EFFECT OF THE BENCH SCALE EXTRACTION CONDITIONS ON Pinus radiata BARK EXTRACT YIELD, ANTIOXIDANT PROPERTIES AND COMPOSITION. Maderas, Cienc. tecnol. [online]. 2013, vol.15, n.1, pp.31-44.  Epub 12-Dez-2012. ISSN 0718-221X.  http://dx.doi.org/10.4067/S0718-221X2013005000003.

Many pine bark extracts have antioxidant properties. This work examined bench scale extraction on the yield, the composition and antioxidant properties of Pinus radiata. Acetone solvent (98.7% w/w at 120 °C) yielded maximum phenols concentration, tannins concentration, anti-radical activity (DPPH) and reducing activity (FRAP), although its extraction yield was the lowest. When the organic solvent in the mixture decreased, the chelating activity increased (ICA) and antiradical and reducing activities decreased. The extract largest yield was obtained with water at 120ºC, but the antioxidant properties were relatively poor. Taxifolin (dihydroquercetin) and catechin were the main extract components detected by RP-HPLC. The best extraction conditions for high extractive yield and antioxidant properties was achieved with ethanol/water at 120 °C.

Palavras-chave : Antioxidant; bark; bench scale; extraction conditions.

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