Optimization of the supercritical fluid coextraction of oil and diterpenes from spent coffee grounds using experimental design and response surface methodology
authors Barbosa, HMA; de Melo, MMR; Coimbra, MA; Passos, CP; Silva, CM
nationality International
journal JOURNAL OF SUPERCRITICAL FLUIDS
author keywords Supercritical fluid extraction; Diterpenes; Spent coffee grounds; Design of experiments; Response surface methodology; Oil
keywords EUCALYPTUS-GLOBULUS BARK; GRAPE SEED OIL; EXTRACT COMPOSITION; OPERATING-CONDITIONS; TRITERPENIC ACIDS; SOLUBILITY DATA; CARBON-DIOXIDE; BETA-CAROTENE; CO2; RESIDUES
abstract The reported work aimed at the optimization of operating conditions of the supercritical fluid extraction (SFE) of spent coffee grounds (SCG) using pure or modified CO2, with particular emphasis on oil enrichment with diterpenes like kahweol, cafestol and 16-O-methylcafestol. The analysis comprised the application of Box-Behnken design of experiments and response surface methodology, and involved three operating variables: pressure (140-190 bar), temperature (40-70 degrees C) and cosolvent (ethanol) addition (0-5 wt.%). The best conditions to maximize total extraction yield are 190 bar/55 degrees C/5 wt.% EtOH, leading to 11.97% (g(oil)/100 g(SCG)). In terms of the concentration of diterpenic compounds in the supercritical extracts, the best operating conditions are 140 bar/40 degrees C/0 wt.% EtOH, providing 102.90 mg g(oil)(-1). The measurement of extraction curves near optimized conditions (140 bar/55 degrees C/0 wt.% EtOH and 190 bar/55 degrees C/0 wt.% EtOH) confirmed the trends of the statistical analysis and revealed that SFE enhances diterpenes concentration by 212-410% at the expenses of reducing the extraction yield between 39% and 79% in comparison to n-hexane extraction. (C) 2013 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0896-8446
year published 2014
volume 85
beginning page 165
ending page 172
digital object identifier (doi) 10.1016/j.supflu.2013.11.011
web of science category Chemistry, Physical; Engineering, Chemical
subject category Chemistry; Engineering
unique article identifier WOS:000330747200023
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journal impact factor 3.122
5 year journal impact factor 3.001
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