abstract
The phenolic composition of cork powder and black condensate, two by-products from the cork industry, was investigated by the first time using high-performance liquid chromatography-multi-stage mass spectrometry (HPLC-MSn). The same methodology of extraction was applied to cork, for comparative purposes. Eighteen phenolic compounds were identified in cork, five of them are reported for the first time as its constituents. Sixteen and thirteen phenolic compounds were identified as cork powder and black condensate components, respectively, with only one compound of each residue published before as its constituent. The antioxidant activity of the extracts was evaluated, being, to our knowledge, the first study concerning the antioxidant activity of these cork residues. The extracts present an antioxidant activity higher than BHT, with black condensate showing the lowest IC50 value. These results, together with the phenolic content values, demonstrate the high potential of these residues as source of high value compounds. (C) 2013 Elsevier B.V. All rights reserved.
keywords
QUERCUS-SUBER L.; MASS-SPECTROMETRY; REPRODUCTION CORK; EXTRACTS; BIOPOLYESTERS; VARIABILITY; COMPONENTS; POWDER; BARK; MS
subject category
Agriculture
authors
Santos, SAO; Villaverde, JJ; Sousa, AF; Coelho, JFJ; Neto, CP; Silvestre, AJD
our authors
Andreia Fernandes de Sousa
Assistant Researcher
Armando Jorge Domingues Silvestre
Full professor
Carlos Pascoal Neto
Raiz Director
Sónia Andreia Oliveira Santos
Assistant Researcheracknowledgements
The authors wish to thank Fundacao para a Ciencia e a Tecnologia for the PhD. grant of S.A.O. Santos (SFRH/BD/42021/2007), postdoctoral grant of J.J. Villaverde (BPD/UI89/4520/2009) and postdoctoral grant of A.F. Sousa (SFRH/BPD/73383/2010), within the Programa Operacional Potencial Humano (POPH) of QREN, and the Associate Lab CICECO funding (Pest-C/CTM/LA0011/2011).