Xenogenic bone matrix processed with supercritical carbon dioxide as potential osteoplastic material
Key words: supercritical extraction, porosity, carbon dioxide, xenogenic matrix, osteoplastic materials
Multistage environmentally benign method of xenogenic bone matrix processing in sub- and supercritical media is developed. This method provides with a fast matrix deli pidation in supercritical carbon dioxide, deproteinization by treatment with 3% hydrogen peroxide solution followed by washing in subcritical water for removal of polar substances. The final treatment with supercritical carbon dioxide serves to remove residual non-polar components. A method to control the porosity of xenogenic bone matrix on several stages of purification is suggested. Preliminary data indicate that cell test system based on the allogenic osteoid cell line Th-1 can be used for evaluation of primary adhesion and cell proliferation on the surface of purified bone matrix.
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ГОСТ
7.0.100-2018
Xenogenic bone matrix processed with supercritical carbon dioxide as potential osteoplastic material / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2014. – Т. 9. – № 3. – С. 4-12. - DOI:
TRANSLIT
Ksenogennyj kostnyj matriks, obrabotannyj sverhkriticheskim dioksidom ugleroda, kak potencial'nyj osteoplasticheskij material / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2014. – Т. 9. – № 3. – S. 4-12. - DOI:
En
Xenogenic bone matrix processed with supercritical carbon dioxide as potential osteoplastic material. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 4-12 (2014). https://doi.org/
Key words: isochoric heat capacity, adiabatic calorimeter, phase transition, «water—n-hexane» system
The isochoric heat capacity of «n-hexane — water» system is studied using the adiabatic calorimeter in the range of water mole fraction between 0.256 and 0.935 at 300—600 K in a wide range of densities. The obtained experimental critical curves of liquid— vapor phase equilibrium are described by an equation that corresponds to the theory of critical phenomena.
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ГОСТ
7.0.100-2018
Critical «liquid—gas»-type phenomena in <i>n</i>-hexane in the presence of liquid phase of water / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2014. – Т. 9. – № 3. – С. 13-20. - DOI:
TRANSLIT
Kriticheskie yavleniya zhidkost'—gaz n-geksana v prisutstvii zhidkoj fazy vody / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2014. – Т. 9. – № 3. – S. 13-20. - DOI:
En
Critical «liquid—gas»-type phenomena in <i>n</i>-hexane in the presence of liquid phase of water. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 13-20 (2014). https://doi.org/
Key words: subcritical water, extraction, chlorogenic acid, green coffee, HPLC
A method of extracting chlorogenic acid that does not utilize expensive organic solvents is developed based on the studies of the treatment of green coffee beans by subcritical water. The amount of chlorogenic acid in the obtained extracts is determined using the high performance liquid chromatography (HPLC). A high efficiency of chlorogenic acid extraction by subcritical water as compared to its extraction by ethanol is demonstrated.
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ГОСТ
7.0.100-2018
Subcritical water extraction of chlorogenic acid from green coffee beans / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2014. – Т. 9. – № 3. – С. 21-27. - DOI:
TRANSLIT
Razrabotka sposoba ekstrakcii hlorogenovoj kisloty iz zeren zelenogo kofe v srede subkriticheskoj vody / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2014. – Т. 9. – № 3. – S. 21-27. - DOI:
En
Subcritical water extraction of chlorogenic acid from green coffee beans. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 21-27 (2014). https://doi.org/
Key words: molecular association, solubility, supercritical fluid, mixed solvent
The association constant caffeine—methanol at 313 K is determined using 1H NMR. The caffeine solubility in a mixed solvent «supercritical carbon dioxide (SC-CO2) — methanol» is calculated taking into consideration the experimentally measured value of association constant in the framework of ASL model (Associated Solution + Lattice) based on the theory of molecular association and a simple lattice model. Individual contributions to the solubility are obtained and relative role of various factors determining the solubility of caffeine in the mixed solvent are analyzed. The presence of a maximum on the dependence of the solubility of caffeine versus the methanol content in the system «SC-CO2 — methanol» is predicted.
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ГОСТ
7.0.100-2018
Solubility of caffeine in a binary solvent supercritical CO<sub>2</sub>—methanol / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2014. – Т. 9. – № 3. – С. 28-35. - DOI:
TRANSLIT
Rastvorimost' kofeina v binarnom rastvoritele sverhkriticheskij CO2—metanol / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2014. – Т. 9. – № 3. – S. 28-35. - DOI:
En
Solubility of caffeine in a binary solvent supercritical CO<sub>2</sub>—methanol. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 28-35 (2014). https://doi.org/
Key words: fine-crystalline corundum, supercritical water fluid, solid phase transformation, induced nucleation, build-up of crystals
The formation of fine-crystalline corundum from hydrargillite at 400 °C in supercritical water fluid (SCWF) at 26.8 MPa in the presence of corundum particles is investigated. It is found that the addition of fused corundum particles into the reaction medium accelerates the formation of fine-crystalline corundum by the increase of the nucleation rate. The process is accompanied by both the build-up of added fused corundum grains, and the generation of new corundum crystals from boehmite. The formation of new crystals depends on the distance between the grains of the additive. Depending on this distance, the newly formed crystals consist of two or three fractions with different average particle sizes. It is concluded that the build-up of the fused corundum particles in the medium of SCWF occurs due to the uptake of corundum nuclei formed in the surrounding layer of boehmite. For the added particles of fused corundum with average size of 2.82 μm the layer from which the build-up occurs has a thickness of 17.47 μm. The corundum nuclei formed at large distances from the growing particles become the centers of the growth of new corundum crystals of the smallest sizes. The role of SCWF is to increase the spatial and structural mobility of the reactants.
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ГОСТ
7.0.100-2018
Induced formation of corundum crystals in supercritical water fluid / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2014. – Т. 9. – № 3. – С. 36-54. - DOI:
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Inducirovannoe formirovanie kristallov korunda v sverhkriticheskom vodnom flyuide / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2014. – Т. 9. – № 3. – S. 36-54. - DOI:
En
Induced formation of corundum crystals in supercritical water fluid. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 36-54 (2014). https://doi.org/
Key words: SCF colloids, silver nanoparticles, plasmonic resonance
Effects of supercritical carbon dioxide (SC-CO2) density on the dynamics of formation of supercritical fluid (SCF) colloids of silver in the course of pulse laser ablation and their post-pulse degradation are studied using in situ UV/vis absorption spectroscopy. Laser irradiation of silver target in SC-CO2 causes an ablative formation of Ag nanoparticles of different sizes and shapes, specifically quasi-spherical nanoparticles (∼4 nm), as well as nanoparticles of larger sizes (hundreds of nanometers). Variations in the colloid density from 0.24 g/cm3 to 0.82 g/cm3 cause significant changes in the ablative formation of small and large nanoparticles, in the rate of small particles aggregation into larger ones, as well as in the rates of gravitation induced sedimentation of small and large nanoparticles in SCF colloid.
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ГОСТ
7.0.100-2018
Dynamic of formation and decay of supercritical fluid colloid of silver in the conditions of pulse laser ablation / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2014. – Т. 9. – № 3. – С. 55-65. - DOI:
TRANSLIT
Dinamika formirovaniya i raspada sverhkriticheskogo flyuidnogo kolloida serebra v usloviyah impul'snoj lazernoj ablyacii / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2014. – Т. 9. – № 3. – S. 55-65. - DOI:
En
Dynamic of formation and decay of supercritical fluid colloid of silver in the conditions of pulse laser ablation. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 55-65 (2014). https://doi.org/
Key words: pulsed supersonic jet, formation of microcapsules, TiO2 nanoparticles
The formation of microcapsules with a nano-sized TiO2 core in a shell from poly(ethylene glycol) is studied. The microcapsules are formed during the expansion of pulsed supersonic jet of TiO2 suspension in supercritical solution of poly(ethylene glycol) (PEG 8000) in CO2 into the chamber containing a background gas (He) (duration of impulse — 400 μs). The effect of the background gas pressure in the expansion chamber onto the size microcapsules and their structure is investigated. The upper and lower limits of the background gas pressure within which microcapsules with a relatively high content of TiO2 nanoparticles are determined.
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ГОСТ
7.0.100-2018
Microcapsulation of titanium dioxide nanoparticles during the expansion of pulsed supersonic jet of supercritical solution into background gas / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2014. – Т. 9. – № 3. – С. 66-72. - DOI:
TRANSLIT
Obrazovanie mikrokapsul, soderzhashchih nanochasticy dioksida titana, pri impul'snom rasshirenii sverhkriticheskogo rastvora v fonovyj gaz / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2014. – Т. 9. – № 3. – S. 66-72. - DOI:
En
Microcapsulation of titanium dioxide nanoparticles during the expansion of pulsed supersonic jet of supercritical solution into background gas. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 66-72 (2014). https://doi.org/
Key words: supercritical extraction, carbon dioxide, garlic, extract, allyl disulfides, biocides
Garlic (Allium sativum L.) extracts, obtained by supercritical CO2 extraction, are fractionated into individual components using preparative High Performance Liquid Chromatography/Gas Chromatography. Several new unsymmetrical allyl disulfides are synthesized. All obtained synthetic substances and garlic individual components were tested as potential antimicrobial agents using the following test systems: Candida utilis, Bacillus cereus, Pseudomonas aurantiaca and Escherichia coli. Synthetic unsymmetrical allyl disulfides (SUAD) are shown to reveal antimicrobial activity compared to individual garlic components. Moreover, in some cases they are more effective than widely used floxacin antibiotics. These results give evidence to consider SUAD as prospective antibacterial pharmaceutical agents.
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ГОСТ
7.0.100-2018
Components of supercritical garlic extracts and synthetic unsymmetrical allyl disulfides as prospective antimicrobial agents / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2014. – Т. 9. – № 3. – С. 73-82. - DOI:
TRANSLIT
Komponenty sverhkriticheskih ekstraktov chesnoka i sinteticheskie nesimmetrichnye allildisul'fidy kak potencial'nye antimikrobnye preparaty / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2014. – Т. 9. – № 3. – S. 73-82. - DOI:
En
Components of supercritical garlic extracts and synthetic unsymmetrical allyl disulfides as prospective antimicrobial agents. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 73-82 (2014). https://doi.org/
Key words: thermodynamic compatibility, supercritical fluids, lignin-carbohydrate matrix, wood substance, lignin, cellulose, hemicelluloses
The advantages of using supercritical fluid technologies as the stages of complex wood and plant processing are analyzed on the basis of modern concept of lignin-carbohydrate matrix formation.
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ГОСТ
7.0.100-2018
Supercritical fluid technologies in chemistry of wood and its components / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2014. – Т. 9. – № 3. – С. 83-95. - DOI:
TRANSLIT
Sverhkriticheskie flyuidnye tekhnologii v himii drevesiny i ee komponentov / – Tekst : neposredstvennyj // Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2014. – Т. 9. – № 3. – S. 83-95. - DOI:
En
Supercritical fluid technologies in chemistry of wood and its components. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 3, 83-95 (2014). https://doi.org/