Supercritical CO2 extraction and selective adsorption of aroma materials of selected spice plants in functionalized silica aerogels

Extraction and Mass Spectrometric Characterization of Terpenes Recovered from Olive Leaves Using a New Adsorbent-Assisted Supercritical CO2 Process

“…Although SFE has been widely employed for terpene extraction and fractionation [33], only a few reports can be found concerning SFE of terpenes from olive leaves; in fact, a search done in the Scopus database using (supercrit* AND extract* AND olive AND leave*) shows only three papers published on this subject [26,34,35]. Combined processes including supercritical extraction and adsorption have been also employed to selectively enrich different terpenoids' fractions from a wide range of raw materials [36][37][38][39]; nevertheless, none of them use olive leaves as a biomass.…”

Insights into Adsorptive Drug Loading on Silica Aerogels from Supercritical CO2

“…In another study, Caputo et al 19 Similar adsorption studies on aerogels from the scCO 2 phase have been reported. A few examples of such studies are adsorption of 2-phenylethyl alcohol on silica aerogels (vessel volume: 188 cm 3 , temperature: 50 °C, pressure: 150 bar, and time for equilibration: 24 h); 20 adsorption of fat-soluble vitamins on alginate aerogels (vessel volume: 33 cm 3 , temperature: 40 °C, pressure: 150/200 bar, time for equilibration: 24 h, and depressurization rate: 3 bar/min); 21 adsorption of the organo-metallic precursor on carbon aerogels (temperature: 60/ 70/80 °C, pressure: 193 bar, and time for equilibration: 24 h); 22 adsorption of aroma from spice plants on silica aerogels (temperature: 50 °C, pressure: 120−130 bar, and time for equilibration: 24 h); 23 and adsorption of the ruthenium complex on silica aerogels (temperature: 40/80 °C, pressure: 180 bar, time for equilibration: 0.5−24 h, and depressurization rate: 0.5− 1 bar/min). 24 In all of the above studies and other research related to the loading of drugs on aerogels or other materials from the scCO 2 phase, the fact that drugs could precipitate during depressurization has been overlooked.…”

“…The Freundlich isotherm equation described the adsorption data well. In another study, Caputo et al 19 22 adsorption of aroma from spice plants on silica aerogels (temperature: 50 °C, pressure: 120−130 bar, and time for equilibration: 24 h); 23 and adsorption of the ruthenium complex on silica aerogels (temperature: 40/80 °C, pressure: 180 bar, time for equilibration: 0.5−24 h, and depressurization rate: 0.5− 1 bar/min). 24 In all of the above studies and other research related to the loading of drugs on aerogels or other materials from the scCO 2 phase, the fact that drugs could precipitate during depressurization has been overlooked.…”

Oil separation process of Citrus sinensis orange: simulation and techno‐economic evaluation

“…In addition, operating at high pressures results in a working fluid with a high density, leading to smaller equipment size, smaller plant footprint and lower capital costs. Generally, carbon dioxide is used as a solvent because it is relatively inexpensive, inert and non‐toxic 18 . Carbon dioxide is an appropriate solvent for essential oil extraction from natural products because it is readily available, non‐inflammable, has high diffusivity, low viscosity, low surface tension and low reactivity.…”

“…Generally, carbon dioxide is used as a solvent because it is relatively inexpensive, inert and non-toxic. 18 Carbon dioxide is an appropriate solvent for essential oil extraction from natural products because it is readily available, noninflammable, has high diffusivity, low viscosity, low surface tension and low reactivity. It has a critical temperature of only 31°C and critical pressure above 71 bar.…”