Supercritical CO2 extraction of V. vinifera leaves: Influence of cosolvents and particle size on removal kinetics and selectivity to target compounds
authors de Melo, MMR; Carius, B; Simoes, MMQ; Portugal, I; Saraiva, J; Silva, CM
nationality International
journal JOURNAL OF SUPERCRITICAL FLUIDS
author keywords BIC modeling; GC-MS; Soxhlet extraction; Supercritical fluid extraction; Vine leaves
keywords RESPONSE-SURFACE OPTIMIZATION; GRAPE SEED OIL; FLUID EXTRACTION; CARBON-DIOXIDE; VOLUMETRIC PROPERTIES; OPERATING-CONDITIONS; ALOE-VERA; SOLUBILITY; PRODUCTS; ETHANOL
abstract Leaves from Vitis vinifera L. contain potential bioactive compounds, namely: long chain aliphatic alcohols (e.g., 1-hexacosanol, 1-octacosanol and 1-triacontanol), alpha-tocopherol, beta-sitosterol, and the triterpenes beta-amyrin and lupeol. Supercritical fluid extraction (SFE) runs were measured at lab scale using: crushed and ground biomass; pure CO2 at 300 bar and 40-80 degrees C; and CO2 modified with 5 and 10 wt.% of ethanol or ethyl acetate. Total SFE yields ranged from 1.86 to 7.52 wt.%. The broken plus intact cells model (BICM), provided a good fitting of the SFE curves with 4.06 % error for total yield and 1.98-5.49 % for the individual yields of the said compounds. The BICM results revealed that the SFE is limited by intraparticle diffusion. Remarkable experimental and calculated selectivities were obtained for triterpenes (lupeol and beta-amyrin), starting with a score of 1.7 and increasing along time to 10-100. (C) 2020 Elsevier B.V. All rights reserved.
publisher ELSEVIER
issn 0896-8446
isbn 1872-8162
year published 2020
volume 165
digital object identifier (doi) 10.1016/j.supflu.2020.104959
web of science category Chemistry, Physical; Engineering, Chemical
subject category Chemistry; Engineering
unique article identifier WOS:000558740300013
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