期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 238, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2019.116395
关键词
Cork; Design of experiments; Friedelin; Quercus cerris; Selectivity
资金
- FCT/MCTES [UID/CTM/50011/2019]
- Project AgroForWealth - Centro2020, through FEDER [CENTRO-01-0145-FEDER000001]
- Project AgroForWealth - PT2020 [CENTRO-01-0145-FEDER000001]
Optimization of the supercritical fluid extraction of Quercus cerris cork was carried out using Box-Behnken design of experiments and response surface methodology (RSM). The optimized process variables were temperature (T: 40, 50 and 60 degrees C), ethanol content (EtOH: 0.0, 2.5 and 5.0 wt%) and CO2 flow rate (Q(CO2): 5, 8 and 11 g min(-1)). The studied responses were total extraction yield (eta(Total)), friedelin concentration of the extract (C-Friedelin), and selectivity towards friedelin (alpha(F,nF)). The linear effect of EtOH was by far the most influent operating condition (Pareto analysis) and the highest yield (eta(Total) = 2.2 wt%) was attained with 5.0 wt% EtOH. The RSM model estimates maximum friedelin concentration in the extracts (38.2 wt%) to occur without cosolvent (0 wt% EtOH) for the lowest T (40 degrees C) and Q(CO2) (5 g(CO2) min(-1)). As for selectivity, the experimental alpha(F,nF) values were always higher than 1.0 and reached 3.1 (at 50 degrees C, 5 wt% EtOH, 11 g(CO2) min(-1)). Altogether, these results suggest friedelin can be selectively removed from Quercus cerris cork by supercritical fluid extraction within the range of experimental conditions studied.
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