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Federica Menichini - One of the best experts on this subject based on the ideXlab platform.
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chemical composition and bioactivity of citrus medica l cv diamante essential oil obtained by hydrodistillation Cold Pressing and supercritical carbon dioxide extraction
Natural Product Research, 2011Co-Authors: Rosa Tundis, Marco Bonesi, Bruno De Cindio, Monica Rosa Loizzo, Filomena Conforti, Giancarlo A Statti, Roberta Menabeni, Ruggero Bettini, Federica MenichiniAbstract:The chemical composition of the essential oil of Citrus medica L. cv. Diamante peel obtained by hydrodistillation, Cold-Pressing and supercritical carbon dioxide extraction techniques was determined by GC/MS analysis. Forty-six components were fully characterised. Limonene and γ-terpinene were the major components of the oils obtained by hydrodistillation (HD) and Cold-Pressing (CP), while citropten was the major constituent in the oil obtained by supercritical carbon dioxide extraction (SFE). Acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) inhibitory activities were evaluated. The essential oil obtained by hydrodistillation exerted the highest inhibitory activity against BChE (IC50 value of 154.6 µg mL−1) and AChE (IC50 value of 171.3 µg mL−1). Interestingly, the oil obtained by Cold-Pressing exhibited a selective inhibitory activity against AChE. The essential oils have also been evaluated for the inhibition of NO production in LPS induced RAW 264.7 macrophages. The oil obtained by hydrodis...
Eugene Vorobiev - One of the best experts on this subject based on the ideXlab platform.
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Influence of canola seed dehulling on the oil recovery by Cold Pressing and supercritical CO2 extraction
Journal of Food Engineering, 2016Co-Authors: Mohamed Koubaa, Houcine Mhemdi, Eugene VorobievAbstract:Dehulling canola seeds provides an enriched cake in oil and proteins leading to an improved meal quality after oil extraction. The aim of this work was therefore to explore the impact of dehulling pre-treatment on both oil recovery and quality, using Cold Pressing followed by supercritical CO2 extraction. For this purpose, whole canola seeds, dehulled seeds, and reconstituted mixtures of 5% and 10% hulls were used to recover canola oil. After 1 h Pressing, the obtained results showed that the lowest oil yield (≈37%) was obtained using dehulled seeds, indicating that dehulling adversely affects the efficiency of Cold Pressing. After Pressing, remaining oil in press cake was extracted by supercritical CO2. After process optimization, the optimal parameters providing the maximum extraction yield (≈74%) were found at 40 °C temperature, 35 MPa pressure, 8.5 kg/h CO2 flow, and 10 min of conditioning. Using these conditions for grinded seeds, the combined process allowed a quasi-total oil recovery (95 ± 3%) and showed similar oil quantities extracted from either whole seeds, dehulled seeds, or reconstituted mixtures, demonstrating thus the efficiency of the proposed process. On the other hand, total phenolic compounds content in oil was reduced upon dehulling, and results show that the oil obtained by supercritical CO2 extraction was about twice enriched in phenolic compounds when compared to that obtained by mechanical Pressing.
Maria Elvira Zuniga - One of the best experts on this subject based on the ideXlab platform.
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Antioxidant content of oil and defatted meal obtained from borage seeds by an enzymatic-aided Cold Pressing process
Process Biochemistry, 2008Co-Authors: Carmen Soto, Jacqueline Concha, Maria Elvira ZunigaAbstract:Polyphenols content (as catechin equivalents) and tocopherol content were determined in borage defatted meal and borage oil, respectively. In addition, antioxidant activity of extracts obtained from borage defatted meal was evaluated. A Cold Pressing process was used for the extraction of Borago officinalis oil, resulting in a defatted meal (by-product). Polyphenols from this defatted borage meal were extracted using several solvents. An extract containing highly soluble solids and phenolic compounds with antioxidant activity (as free radical-scavenging, DPPH) was obtained when methanol was used. The tocopherol content was higher in oil extracted by Cold Pressing than in oil extracted with petroleum ether as organic solvent. An enzymatic treatment was applied (45 °C, 20% moisture, 0.25% E/S ratio, 1:1 Olivex:Celluclast enzymatic mixture) previously to borage oil extraction, which improved the antioxidant content in the borage defatted meal by three-folds, as compared to the values obtained by a nonenzyme-aided process.
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enzymatic treatment on oil extraction and antioxidant recuperation from oenothera biennis by Cold Pressing
Grasas Y Aceites, 2007Co-Authors: Cesar A Collao, Emilia Curotto, Maria Elvira ZunigaAbstract:The aim of this work was to improve the yield in evening primrose oil extraction and the antioxidant potential of the residual meal using an enzyme assisted extraction process with Cold Pressing. Among four commercial enzymes, a mixture of two of them was selected in order to evaluate the effect of enzyme-substrate ratio, temperature, moisture and period of time of the enzymatic pretreatment on the extracted oil. The oil yield increased by 12% when the seeds were pretreated with 2% enzyme-substrate ratio of a mixture of 100G Ultrazym and Cellubrix (1:1) for 15 h at 40 o C and 40% moisture. The defatted meal obtained from the enzyme aided process enhanced its phenol content and improved its potential antioxidant activity in comparison to the control from 250 to 276 mg of phenols/g of meal and from 1463 to 1558 mg of trolox/g of meal respectively.
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enzymatic hydrolysis and Pressing conditions effect on borage oil extraction by Cold Pressing
Food Chemistry, 2007Co-Authors: C Soto, Rolando Chamy, Maria Elvira ZunigaAbstract:Borage seed oil extraction using Cold Pressing produces a good oil quality, but it has a low-yield. In a previous study on a borage oil extraction process by Cold Pressing using commercial enzymes, the oil yield was enhanced in comparison to the control without enzymes. The aim of this work was to further evaluate the effect of temperature, moisture and time of enzymatic hydrolysis; and the effect of this treatment under selected conditions on the Pressing stage and on product qualities. The best treatment condition with Olivex-Celluclast was 45 °C, 20% moisture over 9 h of treatment. When the extraction of the pre-treated borage meal was carried out by double Pressing (20 min each) on preheated matter, 95% of the oil was recovered. The enzymatic treatment did not affect the oil quality and the residual meal was more valuable due to its lower fibre content.
W.j. Xiu - One of the best experts on this subject based on the ideXlab platform.
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Microstructures and thermoelectric properties of p-type pseudo-binary AgxBi0.5Sb1.5−xTe3 (x = 0.05–0.4) alloys prepared by Cold Pressing
Materials Letters, 2006Co-Authors: J.l. Cui, H.f. Xue, W.j. XiuAbstract:Abstract The p-type pseudo-binary AgxBi0.5Sb1.5−xTe3 (x = 0.05–0.4) alloys were prepared by Cold Pressing. The thermal conductivities (κ) were calculated from the values of heat capacities, densities and thermal diffusivities measured, and range approximately from 0.66 to 0.56 (W K− 1 m− 1) for the AgxBi0.5Sb1.5−xTe3 alloy with molar fraction x being 0.4. Combining with the electrical properties obtained in the previous study, the maximum dimensionless figure of merit ZT of 1.1 was obtained at the temperature of 558 K.
Mohamed Koubaa - One of the best experts on this subject based on the ideXlab platform.
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Influence of canola seed dehulling on the oil recovery by Cold Pressing and supercritical CO2 extraction
Journal of Food Engineering, 2016Co-Authors: Mohamed Koubaa, Houcine Mhemdi, Eugene VorobievAbstract:Dehulling canola seeds provides an enriched cake in oil and proteins leading to an improved meal quality after oil extraction. The aim of this work was therefore to explore the impact of dehulling pre-treatment on both oil recovery and quality, using Cold Pressing followed by supercritical CO2 extraction. For this purpose, whole canola seeds, dehulled seeds, and reconstituted mixtures of 5% and 10% hulls were used to recover canola oil. After 1 h Pressing, the obtained results showed that the lowest oil yield (≈37%) was obtained using dehulled seeds, indicating that dehulling adversely affects the efficiency of Cold Pressing. After Pressing, remaining oil in press cake was extracted by supercritical CO2. After process optimization, the optimal parameters providing the maximum extraction yield (≈74%) were found at 40 °C temperature, 35 MPa pressure, 8.5 kg/h CO2 flow, and 10 min of conditioning. Using these conditions for grinded seeds, the combined process allowed a quasi-total oil recovery (95 ± 3%) and showed similar oil quantities extracted from either whole seeds, dehulled seeds, or reconstituted mixtures, demonstrating thus the efficiency of the proposed process. On the other hand, total phenolic compounds content in oil was reduced upon dehulling, and results show that the oil obtained by supercritical CO2 extraction was about twice enriched in phenolic compounds when compared to that obtained by mechanical Pressing.