Supercritical CO₂ extraction of flaxseed

Abstract

Extraction of flaxseed oil was performed with supercritical carbon dioxide (SC-CO 2 ). To investigate the effects of pressure and temperature on the solubility of oil and oil yield, three isobaric (21, 35, and 55 MPa) and two isothermal (50 and 70°C) extraction conditions were selected. Although the maximal solubility of flaxseed oil, 11.3 mg oil/g CO 2 , was obtained at 70°C/55 MPa, the oil yield obtained after 3 h of extraction at this condition was only 25% (g oil/g seed × 100), which represented 66% of the total available oil of the flaxseed. Lipid composition and FFA and tocol (tocopherol and tocotrienol) contents of the oils obtained by both SC-CO 2 and petroleum ether extraction were determined. The α-linolenic acid content of the SC-CO 2 -extracted oil was higher than that obtained by solvent extraction.

Extraction, fatty acid profile and antioxidant activity of sesame extract (Sesamum Indicum L.)

“…The yields of the Soxhlet extractions were significantly (P<0.05) higher than those obtained by supercritical extractions, which is consistent with Bozan and Temelli (2002) for conventional extractions using organic solvents. The results of extractions using the Soxhlet technique and hexane as an extractive solvent are reported in the literature for sesame extracts.…”

“…After extraction, the solvents were evaporated under reduced pressure using a rotary evaporator (Tecnal, model TE220-Brazil) with vacuum control (Tecnal, model TE058-Brazil). The solvents were evaporated under vacuum at 40°C (Bozan and Temelli, 2002;Visavadiya et al, 2009). The Soxhlet used was MARCONI (MA-044/091-Brazil).…”

“…According to Bozan and Temelli (2002), the conventional extraction method using organic solvents such as petroleum ether, for example, also extracts phospholipids, pigments, and unsaponifiable substances, giving a higher extraction yield. However, the analysis of Figure 3 shows there was no stabilization of the kinetic curve in the SFE with cosolvent, indicating that better yields could be obtained by longer extraction periods.…”

Effects of cold‐pressed and vitamin E‐enriched flaxseed oils on lipid profile and antioxidant status in high‐fat fed rats

“…Therefore, artificially adding single or multiple ectogenous micronutrients such as vitamin E to hot-pressed and refined oil may be an expedient in future. Now, with the increasing concerns over nutrition and healthy diet, some new processing and pretreatment technologies of oil such as cold pressing technology have received more and more attention, which to a certain extent remedy the above defects and retain the most quality of bioactive compounds, such as tocopherol, total flavanoid, and polyphenols [9][10][11][12][13][14]. Cold-pressed flaxseed oil (CFO) has been commercially available in the market of many countries.…”

Avaliação do potencial antioxidante e extração subcrítica do óleo de linhaça

“…dos resíduos de solvente orgânico do óleo (BOZAN;TEMELLI, 2002). A extração com fluidos pressurizados, especialmente CO 2 , vem sendo aplicada com sucesso para a obtenção de diversos óleos essenciais e vegetais (BOZAN; TEMELLI, 2002;CARLSON et al, 2001;DEL VALLE et al, 2000;KING, 1999;KOPCAK;AZEVEDO;MOHAMED, 2004;OZER et al, 1996;SOUSA et al, 2005;SOUSA et al, 2002;SOVOVÁ et al, 1994), com a vantagem da obtenção de produtos livres de solvente, uma vez que a separação entre soluto e solvente se dá pela alteração das condições de pressão e/ou temperatura, de modo que o solvente utilizado esteja gasoso nessas condições.…”