Supercritical CO2 extraction of rosehip seed oil: Fatty acids composition and process optimization (original) (raw)
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Oil recovery in rosehip seeds from food plant waste products using supercritical CO 2 extraction
The Journal of Supercritical Fluids, 2016
Valuable oils in rosehip seeds produced as the solid waste during the process of marmalade production using seed-containing fruits were recovered by supercritical CO 2 extraction method. The influence of the particle size (125 ≤ Dp > 1000 m), volumetric flow rate of supercritical solvent (0.75-3.5 mL/min), pressure (20-40 MPa), temperature (40-60 • C) and entrainer concentration (2.5-7.5%vol. ethanol) on the extraction yield in the recovery process was examined. The highest extraction yield determined as 16.5 g oil/100 g dry solid was reached in approximately 150 min by using supercritical CO 2 extraction (30 MPa, 40 • C, 0.75 mL/min, 355 < D p < 500 m) and in the case where 5%vol. ethanol is used as entrainer, it was reached in about 90 min. In similar oil profiles obtained through Soxhlet and supercritical fluid extractions, the ratio of unsaturated fatty acids to saturated fatty acids is about 17. Significant changes were determined in morphological structures of waste seeds compared to unprocessed seeds in marmalade production, by using scanning electron microscope. Apparent solubility values of rosehip oil in supercritical CO 2 did exhibit a significant consistency with Chrastil, del Valle-Aguilera, Adachi-Lu and Sparks solubility models.
Journal of Supercritical Fluids, 2004
Rosehip oil was extracted from milled seeds with supercritical carbon dioxide (SC-CO2). The effects of sample pretreatment and interstitial solvent velocity (0.40–2.45 mm/s) on kinetics of extraction (oil yield versus time) were evaluated at 40 °C and 300 bar, and at 50 °C and 400 bar in a one-pass screening system (laboratory scale). Seeds were grinded in a hammer mill or a roller mill with a gap of adjustable thickness, and samples from the hammer mill were further size-classified. Data was fitted to a two-stage model, with extraction rate controlled by oil solubility initially, and by mass transfer in the solid phase at the end. The mass transfer coefficient and axial dispersion of the solute in the supercritical phase, and the solubility of the oil in SC-CO2 were estimated as a function of the extraction conditions using literature correlations, and the “free” oil content (Xf) and mass transfer coefficient in the solid substrate (ks) were used as fitting parameters. Both Xf (0.026–0.030 g oil/g substrate) and ks (0.6–0.9×10−9 m/s) depended on sample pretreatment but not on the assayed extraction conditions, as expected. Free oil represented 33–41% of the total content, and effective diffusivities of oil in the solid were 330–710 times smaller than binary diffusivities of oil in SC-CO2. Based on best-fitting parameters for kinetic data at the laboratory-scale, extraction kinetics was simulated for a process development unit with solvent recycle (scale-up factor of 30 for the volume of the extraction vessel). It was observed that extraction was slower at the pilot plant than laboratory scale due probably to flow heterogeneity in the extraction vessel, increased dispersion of solute between the extraction and separation vessels, entrainment of oil droplets in recycled gaseous stream, or a combination of these three effects.
Extraction of safflower seed oil by supercritical CO 2
Journal of Food Engineering, 2009
Safflower seed oil extraction with supercritical CO 2 at series operational parameters of pressure, temperature, flow rate and particle size was investigated in a bench scale apparatus. The results show that the extraction yields plotted as a function of time are significantly affected by the extraction pressure, flow rate and particle size, but extraction yields plotted versus CO 2 used are scarcely affected by flow rate. Extraction temperature has a slight effect on the extraction curves. In order to describe the extraction process, the Sovova's extended Lack's Model (SLM) was used and the experimental data were well fitted by it. The extraction was scaled up to pilot plant and the computed values of SLM are in good agreement with the pilot plant data. Additionally, the quality of safflower seed oil obtained by supercritical CO 2 extraction is superior to that of oil obtained by traditional methods. It is noted that a new method of changing flow rate was proposed to improve the process efficiency and proved to be valuable by experiment.
Critical review of supercritical carbon dioxide extraction of selected oil seeds
Acta periodica technologica, 2010
Supercritical carbon dioxide extraction, as a relatively new separation technique, can be used as a very efficient process in the production of essential oils and oleoresins from many of plant materials. The extracts from these materials are a good basis for the new pharmaceutical products and ingredients in the functional foods. This paper deals with supercritical carbon dioxide extraction of selected oil seeds which are of little interest in classical extraction in the food industry. In this article the process parameters in the supercritical carbon dioxide extraction, such as pressure, temperature, solvent flow rate, diameter of gound materials, and moisture of oil seed were presented for the following seeds: almond fruits, borage seed, corn germ, grape seed, evening primrose, hazelnut, linseed, pumpkin seed, walnut, and wheat germ. The values of investigated parameters in supercritical extraction were: pressure from 100 to 600 bar, temperature from 10 to 70oC, diameter of grindi...
Industrial Crops and Products, 2019
Hibiscus sabdariffa L. (Roselle) seeds are rich in proteins, carbohydrates and unsaturated fatty acids, and are a good source of minerals and antioxidants. Supercritical carbon dioxide (SC-CO 2) extraction was applied for extraction of oil from Roselle seed at temperatures of 40°C to 80°C and pressures of 20 MPa to 30 MPa. The effects of temperature and pressure on the extraction yield and solubility of oil were determined. Process optimization was carried out using response surface methodology (RSM). A particle size of 300 μm, SC-CO 2 flow rate of 5 mL/min and extraction time of 180 min were held constant throughout this study. The overall oil yield increased as pressure and temperature was increased, while a reverse effect was observed at higher temperatures. The optimum extraction conditions for Roselle seed oil corresponded to a pressure of 30 MPa and temperature of 40°C. According to the analysis of variance (ANOVA), the coefficient of determination R 2 for oil yield and gamma tocopherol concentration were 0.9723 and 0.9754, respectively, indicating a good correlation and agreement between the experimental and predicted values.
Enrichment of omega3 fatty acids from Tyulka oil by supercritical CO2 extraction
Journal of Chemical Technology & Biotechnology, 2009
BACKGROUND: Supercritical CO2 enrichment of omega3 essential fatty acids (FAs) from Tyulka oil, using a batch process was investigated. Fractional factorial design was applied to evaluate the effects of the five process parameters: pressure (20.26 to 25.33 MPa); temperature (40 to 50 °C); packing fraction (0.5 to 0.7); modifier fraction (2 to 5%); and dynamic time (15 to 25 min), and their binary interactions on the enrichment of extracted omega3 FAs. By employing experimental design and analysis of variance, the variables were evaluated according to the significance of their effect on the yield of extracted omega3.RESULTS: The experimental results confirmed that pressure and dynamic time were the most important factors affecting enrichment of omega3. The amount of modifier in the feed also showed an increasing effect on the response. The binary interaction effects were investigated, and are discussed in detail.CONCLUSION: Optimum conditions were found at 25.33 MPa, 46.65 °C, packin...
Advance Journal of Food Science and Technology, 2017
This study aimed to maximize the oil yield from Gac seed kernels using supercritical carbon dioxide (SC-CO 2) extraction. Gac seed kernel powder (4 g) with particle diameters <500 µm was extracted for 32 min. Response surface methodology with central composite design was used to optimize the SC-CO 2 extraction parameters: temperature (60-80°C), pressure (5,000-7,000 psi (34,474-48,263 kPa)) and SC-CO 2 flow rate (1-2.5 mL/min). The oil yield, accurately represented by a second order equation (R 2 = 0.99, p<0.0001), was predicted to be most substantially and significantly influenced by temperature (p<0.0001), followed by pressure (p<0.02) but not by the CO 2 flow rate (p = 0.20). The optimum conditions were predicted to be: temperature of 73°C, pressure of 5,900psi (40,679kPa) and CO 2 flow rate of 1.5 mL/min. The optimum oil yield was predicted to be 34.1±0.8% (g oil/100 g Gac seed kernel powder) and experimentally validated at 33.9±0.5%. The oil was likely high in saturated fat, being solid at room temperature and having a low iodine value, with 33.2±1.1% being unsaponifiable matter.