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Supercritical CO2 Extraction (supercritical + co2_extraction)

Distribution by Scientific Domains

Chemistry	75%
Polymers and Materials Science	25%

Selected Abstracts

Supercritical CO2 Extraction of Essential Oil from Algerian Rosemary (Rosmarinus officinalis,L.)

CHEMICAL ENGINEERING & TECHNOLOGY (CET), Issue 3 2010
A. Zermane
Abstract The present study presents experimental results concerning the supercritical CO2 extraction of essential oil from Algerian rosemary leaves. The effects of key operating parameters such as pressure, temperature, particle size and CO2 mass flow rate on the extraction yield were investigated. The obtained yields were in the range of 0.95,3.52,g oil/g dry rosemary, and the best value was observed at a pressure of 22,MPa, a temperature of 40,°C, a flow rate of 7,g/min, and a particle size of 1,mm. The performance of the local rosemary used was assessed by comparison of the obtained yields with values reported in the literature for essential oils derived from different rosemary sources. The GC and the GC-MS analyses showed that the major compound detected in the essential oil was camphor, at 48.89,wt,%. [source]

Extraction and isolation of Pistacia lentiscus L. essential oil by supercritical CO2

FLAVOUR AND FRAGRANCE JOURNAL, Issue 4 2002
Raffaele Congiu
Abstract Supercritical CO2 extraction coupled to a fractional separation technique (SFE) was used to isolate essential oil from the leaves and berries of Pistacia lentiscus L. The technique adopted allowed us to separate the volatile oil from waxes. In the case of the leaf essential oil, the yield was 0.45% by weight of the charged material. The chemical composition of the oil, determined by GC,MS analysis, revealed the presence of ,-caryophyllene (31.38%), germacrene D (12.05%) and ,-cadinene (6.48%). Remarkable differences were noticed in the corresponding hydrodistilled oil, composed chiefly by ,-pinene (18.71%), ,-phellandrene (12.83%) and ,-caryophyllene (13.22%). The yield of volatile oil obtained or treating Pistacia lentiscus berries was only 0.2%. ,-myrcene, ,-pinene and ,-phellandrene are the compounds characteristic of the oil obtained with both methods, SFE and hydrodistillation. Copyright © 2002 John Wiley & Sons, Ltd. [source]

Supercritical CO2 extraction of accumulated capsidiol from biotic elicitor-activated Capsicum annuum L fruit tissues

JOURNAL OF CHEMICAL TECHNOLOGY & BIOTECHNOLOGY, Issue 2 2005
ur Salg
Abstract This work investigates the supercritical CO2 extraction of capsidiol from pepper fruit tissues activated with Alternaria alternate (Fr) Keissler suspension culture as a biotic elicitor. Capsidiol production in the fruit tissue was markedly increased by the treatment with a biotic elicitor and reached its maximum level after 4 days of elicitation. The effects of separation parameters such as temperature, pressure, supercritical solvent flow rate, particle diameter and also initial capsidiol concentration were investigated on solubility, initial extraction rate and extraction yield. The optimal extraction conditions were obtained at the temperature of 40 °C, the pressure of 400 bar, the supercritical CO2 flow rate of 2 cm3 min,1, and the average particle diameter of 116 µm. The results showed that the ratio of the supercritical CO2 extraction yield to the organic solvent extraction yield was changed from 84 to 97 wt-% depending on the initial capsidiol concentration. Copyright © 2004 Society of Chemical Industry [source]

Interaction of Osteoblasts with Macroporous Scaffolds Made of PLLA/PCL Blends Modified with Collagen and Hydroxyapatite,

ADVANCED ENGINEERING MATERIALS, Issue 8 2009
Halil Murat Aydin
To mimic natural bone, a tissue engineering scaffold was developed that combines inorganic and organic components of natural bone, its pore diameter, and its interconnected structure. Collagen was coated onto a PLLA/PCL scaffold and hydroxyapatite particles were delivered throughout the polymer matrix much more easily than with other techniques thanks to the porosity-forming method of combining two porogens, namely, salt leaching and supercritical CO2 extraction. Compared with other coating techniques, this procedure can be performed readily and homogeneous 3D hydroxyapatite coating was achieved. [source]

Supercritical carbon dioxide extraction of volatiles from Satureja fruticosa Béguinot

FLAVOUR AND FRAGRANCE JOURNAL, Issue 5 2007
J. A. Coelho
Abstract Dried flowers and leaves of Satureja fruticosa Béguinot were submitted to supercritical CO2 extraction (SFE), followed by a two-stage fractional separation. The extraction was carried out at 40 °C in a flow apparatus, provided with a 1 l extraction vessel and two separators of 0.27 l each. Conditions of extraction, such as pressure, particle size of plant material and CO2 flow rate, were studied in order to assess their influence on the yield and composition of the volatiles. The best conditions of extraction were 90 bar pressure at 1.32 kg/h CO2 flow rate and a plant material particle size of 0.5 mm. The SFE volatiles obtained and the essential oil isolated by hydrodistillation (HD) were analysed and compared by GC and GC,MS. The oxygen-containing monoterpenes, pulegone (33,36% for SFE and 40,41% for HD), isomenthone (14,18% for SFE and 21% for HD), piperitenone (11,12% for SFE and 9,11% for HD) and piperitenone oxide (11,13% for SFE and 7,9% for HD) were the dominant components in all samples. Copyright © 2007 John Wiley & Sons, Ltd. [source]

Fabrication of Stable Low-Density Silica Aerogels Containing Luminescent ZnS Capped CdSe Quantum Dots,

ADVANCED MATERIALS, Issue 15 2006
L. Sorensen
Luminescent CdSe quantum dots of 2.5 and 6.0,nm dimension have been incorporated into a low-density silica aerogels matrix. The aerogels are formed from the supercritical CO2 extraction of an alcogel containing quantum dots surface passivated with 3-aminopropyltriethoxysilane. The resulting aerogels (see figure and cover) are low scattering and show intense, stable luminescence. [source]