Quercus cerris extracts obtained by distinct separation methods and solvents: Total and friedelin extraction yields, and chemical similarity analysis by multidimensional scaling
authors Vieira, PG; de Melo, MMR; Sen, A; Simoes, MMQ; Portugal, I; Pereira, H; Silva, CM
nationality International
journal SEPARATION AND PURIFICATION TECHNOLOGY
author keywords Cork; Multidimensional scaling; Quercus cerris; Solid-liquid extraction; Soxhlet extraction; Supercritical fluid extraction
keywords SUPERCRITICAL-FLUID EXTRACTION; FTIR SPECTROSCOPY; TRITERPENIC ACIDS; CLUSTER-ANALYSIS; IONIC LIQUID; SUBER L.; CORK; GREEN; KINETICS; BARK
abstract This work encompasses a comparison of the extraction of Quercus cerris cork with methanol, ethanol, dichloromethane, and petroleum ether by Soxhlet and room temperature batch solid-liquid extraction (SLE) and with supercritical carbon dioxide modified with ethanol. The maximum total extraction yield (eta(Total)) was attained by Soxhlet extraction with methanol (eta(Total) = 13.8 wt.%) and the minimum for batch SLE with petroleum ether (eta(Total) = 0.35 wt.%). For the supercritical fluid extraction (SFE) runs eta(Total) ranged from 1.2 to 1.7 wt.%. In terms of friedelin extraction yields (eta(Friedelin)) the results ranged from 0.12 wt.% (batch SLE with petroleum ether) to 1.68 wt.% (Soxhlet with methanol). The best performing assays in terms of friedelin concentration in the extracts (C-Friedelin) were those involving weakly polar or nonpolar solvents. Batch extractions at room temperature reached C-Friedelin values significantly lower than Soxhlet extractions with the same solvent due to the unfavourable effect of temperature on the solubilisation of friedelin. The extracts were analysed by FTIR-ATR and GC-MS and the data used for similarity analysis using multidimensional scaling (MDS). The results unveil that more than the extraction method (Soxhlet, Batch, or SFE) it is the intrinsic polarity of the solvent that defines the ensuing chemical composition of the extracts. For this reason, this study contributes for the selection of solvents and extraction methods of future industrial applications targeting Q. cerris cork valorization.
publisher ELSEVIER
issn 1383-5866
isbn 1873-3794
year published 2020
volume 232
digital object identifier (doi) 10.1016/j.seppur.2019.115924
web of science category Engineering, Chemical
subject category Engineering
unique article identifier WOS:000488657200010
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journal analysis (jcr 2019):
journal impact factor 5.774
5 year journal impact factor 5.257
category normalized journal impact factor percentile 89.161
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