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Extraction of Antioxidants from Spruce (Picea abies) Bark using Eco‐friendly Solvents
Author(s) -
Co Michelle,
Fagerlund Amelie,
Engman Lars,
Sunnerheim Kerstin,
Sjöberg Per J.R.,
Turner Charlotta
Publication year - 2011
Publication title -
phytochemical analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 72
eISSN - 1099-1565
pISSN - 0958-0344
DOI - 10.1002/pca.1316
Subject(s) - chemistry , dpph , bark (sound) , extraction (chemistry) , picea abies , antioxidant , environmentally friendly , antioxidant capacity , chromatography , botany , organic chemistry , forestry , geography , ecology , biology
Antioxidants are known to avert oxidation processes and they are found in trees and other plant materials. Tree bark is a major waste product from paper pulp industries; hence it is worthwhile to develop an extraction technique to extract the antioxidants. Objective To develop a fast and environmentally sustainable extraction technique for the extraction of antioxidants from bark of spruce ( Picea abies ) and also to identify the extracted antioxidants that are abundant in spruce bark. Methodology A screening experiment that involved three different techniques was conducted to determine the best technique to extract antioxidants. The antioxidant capacity of the extracts was determined with DPPH (2,2‐diphenyl‐1‐picrylhydrazyl) assay. Pressurised fluid extraction (PFE) turned out to be the best technique and a response surface design was therefore utilised to optimise PFE. Furthermore, NMR and HPLC‐DAD‐MS/MS were applied to identify the extracted antioxidants. Results PFE using water and ethanol as solvent at 160 and 180°C, respectively, gave extracts of the highest antioxidant capacity. Stilbene glucosides such as isorhapontin, piceid and astringin were identified in the extracts. Conclusion The study has shown that PFE is a fast and environmentally sustainable technique, using water and ethanol as solvent for the extraction of antioxidants from spruce bark. Copyright © 2011 John Wiley & Sons, Ltd.