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Singh N, Vinjamur M, Mukhopadhyay M. Insights into Adsorptive Drug Loading on Silica Aerogels from Supercritical CO 2. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:13075-13083. [PMID: 36257024 DOI: 10.1021/acs.langmuir.2c01694] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
This work gives an insight into the process of adsorptive drug loading in silica aerogels from supercritical CO2 (scCO2). A prevalent method for such loading entails bringing the aerogels into contact with the drug-scCO2 solution followed by slow or isothermal depressurization. Our previous work established that drug precipitates during depressurization. Consequently, the adsorptive drug loading measured by the prevalent method includes precipitation. An alternative method is presented for accurate measurement of adsorption avoiding precipitation. To illustrate the disparity between the two methods, the concentration dependence of drug loadings in scCO2, obtained by both methods, is compared for fenofibrate, ibuprofen, and benzoic acid. A mechanism is proposed, and a mathematical model is developed for comparing the adsorptive drug loadings by both methods. The loading obtained by the present method is found to be much less than that by the prevalent method, though both correlate well with the formalism of the Langmuir adsorption equation with the same equilibrium constant at low concentrations. Equations are developed for the concentration dependence of drug loadings measured by both methods at all concentrations in scCO2.
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Affiliation(s)
- Neha Singh
- Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra400076, India
| | - Madhu Vinjamur
- Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra400076, India
| | - Mamata Mukhopadhyay
- Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra400076, India
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Highly Efficient and Rapid Removal of Methylene Blue from Aqueous Solution Using Folic Acid-Conjugated Dendritic Mesoporous Silica Nanoparticles. Processes (Basel) 2022. [DOI: 10.3390/pr10040705] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022] Open
Abstract
Dendritic Mesoporous Silica Nanoparticles (DMSNs) are considered superior in the adsorption of unfavorable chemical compounds and biological pollutants. Herein, we have synthesized folic acid-terminated dendritic mesoporous silica nanoparticles (FA-DMSN) for the removal of cationic dyes, methylene blue (MB), from aqueous solutions. The structural, morphological, functional, specific surface area, pore size distribution, and thermal properties of the synthesized DMSNs were identified using a scanning electron microscope (SEM), a transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), Brunauer−Emmett−Teller (BET), and Thermogravimetric Analyzer (TGA). The synthesized DMSNs exhibited a high surface area (521 m2 −1) and pore volume (1.2 cm3 g−1). In addition, it features both wide pore size and narrow distributions, which strongly affect the adsorption performance in terms of the equilibrium uptake time. Moreover, the impact of pH, contacting time, and dye’s initial concentration on the removal efficiency of MB was studied. The extraction efficiency of FA-DMSN was found to be three times more effective than the bare DMSN materials. Langmuir isotherm fitted the experimental data very well with a correlation coefficient value of 0.99. According to the Langmuir model, the maximum adsorption capacity was 90.7 mg/g. Furthermore, the intra−particle diffusion model revealed a significantly fast intra-particle diffusion which can be attributed to the presence of the large pore’s channels. Finally, the fast adsorption of MB molecules, reaching their equilibrium capacity within tens of seconds, as well as the low cost and ease of FA-DMSN fabrication, makes the developed material an effective adsorbent for water remediations.
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Liparoti S, Franco P, Pantani R, De Marco I. Supercritical CO2 impregnation of caffeine in biopolymer films to produce anti-cellulite devices. J Supercrit Fluids 2022. [DOI: 10.1016/j.supflu.2021.105411] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Thermal Gelation for Synthesis of Surface-Modified Silica Aerogel Powders. Gels 2021; 7:gels7040242. [PMID: 34940302 PMCID: PMC8701169 DOI: 10.3390/gels7040242] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 11/25/2021] [Accepted: 11/25/2021] [Indexed: 11/24/2022] Open
Abstract
A spherical silica aerogel powder with hydrophobic surfaces displaying a water contact angle of 147° was synthesized from a water glass-in-hexane emulsion through ambient pressure drying. Water glass droplets containing acetic acid and ethyl alcohol were stabilized in n-hexane with a surfactant. Gelation was performed by heating the droplets, followed by solvent exchange and surface modification using a hexamethyldisilazane (HMDS)/n-hexane solution. The pH of the silicic acid solution was crucial in obtaining a highly porous silica aerogel powder with a spherical morphology. The thermal conductivity, tapped density, pore volume, and BET surface area of the silica aerogel powder were 22.4 mW·m−1K−1, 0.07 g·cm−3, 4.64 cm3·g−1, and 989 m2·g−1, respectively. Fourier transform infrared (FT–IR) spectroscopy analysis showed that the silica granule surface was modified by Si-CH3 groups, producing a hydrophobic aerogel.
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Liu H, Chen BQ, Pan YJ, Fu CP, Kankala RK, Wang SB, Chen AZ. Role of supercritical carbon dioxide (scCO 2) in fabrication of inorganic-based materials: a green and unique route. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2021; 22:695-717. [PMID: 34512177 PMCID: PMC8425740 DOI: 10.1080/14686996.2021.1955603] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 06/29/2021] [Accepted: 07/08/2021] [Indexed: 06/13/2023]
Abstract
In recent times, the supercritical carbon dioxide (scCO2) process has attracted increasing attention in fabricating diverse materials due to the attractive features of environmentally benign nature and economically promising character. Owing to these unique characteristics and high-penetrability, as well as diffusivity conditions of scCO2, this high-pressure technology, with mild operation conditions, cost-effective, and non-toxic, among others, is often applied to fabricate various organic and inorganic-based materials, resulting in the unique crystal architectures (amorphous, crystalline, and heterojunction), tunable architectures (nanoparticles, nanosheets, and aerogels) for diverse applications. In this review, we give an emphasis on the fabrication of various inorganic-based materials, highlighting the recent research on the driving factors for improving the quality of fabrication in scCO2, procedures for production and dispersion in scCO2, as well as common indicators utilized to assess quality and processing ability of materials. Next, we highlight the effects of specific properties of scCO2 towards synthesizing the highly functional inorganic-based nanomaterials. Finally, we summarize this compilation with interesting perspectives, aiming to arouse a more comprehensive utilization of scCO2 to broaden the horizon in exploring the green/eco-friendly processing of such versatile inorganic-based materials. Together, we firmly believe that this compilation endeavors to disclose the latent capability and universal prevalence of scCO2 in the synthesis and processing of inorganic-based materials.
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Affiliation(s)
- Hao Liu
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, P. R. China
- College of Chemical Engineering, Huaqiao University, Xiamen, P. R. China
| | - Biao-Qi Chen
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, P. R. China
- Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen, P. R. China
| | - Yu-Jing Pan
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, P. R. China
| | - Chao-Ping Fu
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, P. R. China
- Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen, P. R. China
| | - Ranjith Kumar Kankala
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, P. R. China
- College of Chemical Engineering, Huaqiao University, Xiamen, P. R. China
- Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen, P. R. China
| | - Shi-Bin Wang
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, P. R. China
- Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen, P. R. China
| | - Ai-Zheng Chen
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, P. R. China
- College of Chemical Engineering, Huaqiao University, Xiamen, P. R. China
- Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen, P. R. China
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Alekseev ES, Alentiev AY, Belova AS, Bogdan VI, Bogdan TV, Bystrova AV, Gafarova ER, Golubeva EN, Grebenik EA, Gromov OI, Davankov VA, Zlotin SG, Kiselev MG, Koklin AE, Kononevich YN, Lazhko AE, Lunin VV, Lyubimov SE, Martyanov ON, Mishanin II, Muzafarov AM, Nesterov NS, Nikolaev AY, Oparin RD, Parenago OO, Parenago OP, Pokusaeva YA, Ronova IA, Solovieva AB, Temnikov MN, Timashev PS, Turova OV, Filatova EV, Philippov AA, Chibiryaev AM, Shalygin AS. Supercritical fluids in chemistry. RUSSIAN CHEMICAL REVIEWS 2020. [DOI: 10.1070/rcr4932] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Kostenko MO, Ustinovich KB, Pokrovskii OI. Online Monitoring of Adsorption onto Silica Xerogels and Aerogels from Supercritical Solutions Using Supercritical Fluid Chromatography. RUSS J INORG CHEM+ 2020. [DOI: 10.1134/s0036023620100125] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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De Marco I, Riemma S, Iannone R. Life cycle assessment of supercritical impregnation: Starch aerogel + α-tocopherol tablets. J Supercrit Fluids 2019. [DOI: 10.1016/j.supflu.2018.09.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Measurement and modeling of adsorption equilibria of cobalt (III) acetylacetonate on MCM-41 mesoporous silica in the presence of supercritical carbon dioxide with methanol co-solvent. J Supercrit Fluids 2018. [DOI: 10.1016/j.supflu.2018.06.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Liu C, Zhang Y, Cai J. Synthesis of Ru‐silica aerogel as efficient catalyst for hydrogenation of p‐phenylenediamine to 1,4‐cyclohexanediamine. CAN J CHEM ENG 2018. [DOI: 10.1002/cjce.23295] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Chunyang Liu
- Chemical Engineering Research CenterEast China University of Science and Technology (ECUST)Shanghai 200237China
| | - Yu Zhang
- Chemical Engineering Research CenterEast China University of Science and Technology (ECUST)Shanghai 200237China
| | - Jianguo Cai
- Chemical Engineering Research CenterEast China University of Science and Technology (ECUST)Shanghai 200237China
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Kon’kova TV, Gordienko MG, Men’shutina NV, Kolesnikov VA. Pore Structure and Properties of Silica Gels Prepared in Emulsions. RUSS J INORG CHEM+ 2018. [DOI: 10.1134/s0036023618050054] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Adsorption kinetics of rhodium (III) acetylacetonate onto mesoporous silica adsorbents in the presence of supercritical carbon dioxide. J Supercrit Fluids 2018. [DOI: 10.1016/j.supflu.2018.01.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Laser assisted synthesis of silver nanoparticles in silica aerogel by supercritical deposition technique. J Supercrit Fluids 2017. [DOI: 10.1016/j.supflu.2017.03.028] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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De Marco I, Reverchon E. Starch aerogel loaded with poorly water-soluble vitamins through supercritical CO 2 adsorption. Chem Eng Res Des 2017. [DOI: 10.1016/j.cherd.2017.01.024] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Adsorption equilibria of rhodium acetylacetonate with MCM-41, MSU-H, and HMS silica substrates in supercritical carbon dioxide for preparing catalytic mesoporous materials. J Supercrit Fluids 2017. [DOI: 10.1016/j.supflu.2016.05.032] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Bozbağ SE, Gümüşoğlu T, Yılmaztürk S, Ayala CJ, Aindow M, Deligöz H, Erkey C. Electrochemical performance of fuel cell catalysts prepared by supercritical deposition: Effect of different precursor conversion routes. J Supercrit Fluids 2015. [DOI: 10.1016/j.supflu.2014.08.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Morère J, Torralvo MJ, Pando C, Renuncio JAR, Cabañas A. Supercritical fluid deposition of Ru nanoparticles onto SiO2 SBA-15 as a sustainable method to prepare selective hydrogenation catalysts. RSC Adv 2015. [DOI: 10.1039/c5ra04969e] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Ru/SiO2 SBA-15 materials prepared using supercritical CO2 (scCO2) are efficient and selective catalysts in partial hydrogenation reactions.
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Affiliation(s)
- J. Morère
- Department of Physical Chemistry I
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | - M. J. Torralvo
- Department of Inorganic Chemistry I
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | - C. Pando
- Department of Physical Chemistry I
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | - J. A. R. Renuncio
- Department of Physical Chemistry I
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | - A. Cabañas
- Department of Physical Chemistry I
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
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Supercritical deposition: Current status and perspectives for the preparation of supported metal nanostructures. J Supercrit Fluids 2015. [DOI: 10.1016/j.supflu.2014.09.036] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Kon’kova TV, Gordienko MG, Alekhina MB, Men’shutina NV. Synthesis of silica gels with a controlled porous structure. RUSS J INORG CHEM+ 2014. [DOI: 10.1134/s0036023614110114] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Baldino L, Cardea S, De Marco I, Reverchon E. Chitosan scaffolds formation by a supercritical freeze extraction process. J Supercrit Fluids 2014. [DOI: 10.1016/j.supflu.2014.03.002] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Cardea S, Baldino L, Scognamiglio M, Reverchon E. 3D PLLA/ibuprofen composite scaffolds obtained by a supercritical fluids assisted process. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2014; 25:989-998. [PMID: 24366467 DOI: 10.1007/s10856-013-5130-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Accepted: 12/19/2013] [Indexed: 06/03/2023]
Abstract
The emerging next generation of engineered tissues is based on the development of loaded scaffolds containing bioactive molecules in order to control the cellular function or to interact on the surrounding tissues. Indeed, implantation of engineered biomaterials might cause local inflammation because of the host's immune response; thereby, the use of anti-inflammatory agents, whether steroidal or nonsteroidal is required. One of the most important stages of tissue engineering is the design and the generation of a porous 3D structure, with high porosity, high interconnectivity and homogenous morphology. Various techniques have been reported in the literature for the fabrication of biodegradable scaffolds, but they suffer several limitations. In this study, for the first time, the possibility of generating 3D polymeric scaffolds loaded with an active compound by supercritical freeze extraction process is evaluated; this innovative process combines the advantages of the thermally induced phase separation process and of the supercritical carbon dioxide drying. Poly-L-lactid acid/ibuprofen composite scaffolds characterized by a 3D geometry, micrometric cellular structures and wrinkled pores walls have been obtained; moreover, homogeneous drug distribution and controlled release of the active principle have been assured.
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Affiliation(s)
- S Cardea
- Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084, Fisciano, Italy,
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Cardea S, Baldino L, Pisanti P, Reverchon E. 3-D PLLA scaffolds formation by a supercritical freeze extraction assisted process. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2014; 25:355-362. [PMID: 24129832 DOI: 10.1007/s10856-013-5069-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Accepted: 10/09/2013] [Indexed: 06/02/2023]
Abstract
Various techniques have been reported in the literature for the fabrication of biodegradable scaffolds; but, it is very difficult to obtain in the same structure macro, micro and nanostructural characteristics. In this work we developed a supercritical freeze extraction process (SFEP) for the formation of poly(L-lactic acid) (PLLA) scaffolds, that combines the advantages of thermally induced phase separation with those of supercritical drying. We processed solutions in chloroform of two PLLA molecular weights and at different polymer concentrations ranging between 5 and 20 % w/w. Supercritical drying was performed at 35 °Cand pressures ranging between 100 and 250 bar. 3-D scaffolds characterized by high porosity (between 88 and 97.5 %), with coexisting micro and nanometric morphology were obtained. Structures generated were characterized by pores ranging between 10 and 30 μm and with a wrinkled nanostructure of about 200 nm, superimposed on the internal pore surface, that could be useful for biomedical applications. A solvent residue lower than 5 ppm was also measured.
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Affiliation(s)
- S Cardea
- Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084, Fisciano, Italy,
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Use of solvent mixtures in supercritical antisolvent process to modify precipitates morphology: Cellulose acetate microparticles. J Supercrit Fluids 2013. [DOI: 10.1016/j.supflu.2013.08.018] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Reverchon E, Adami R. Supercritical assisted atomization to produce nanostructured chitosan-hydroxyapatite microparticles for biomedical application. POWDER TECHNOL 2013. [DOI: 10.1016/j.powtec.2013.05.035] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Della Porta G, Del Gaudio P, De Cicco F, Aquino RP, Reverchon E. Supercritical Drying of Alginate Beads for the Development of Aerogel Biomaterials: Optimization of Process Parameters and Exchange Solvents. Ind Eng Chem Res 2013. [DOI: 10.1021/ie401335c] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Giovanna Della Porta
- Department of Industrial Engineering, University of Salerno, via Ponte don Melillo, 84084 Fisciano (SA),
Italy
| | - Pasquale Del Gaudio
- Department of Pharmaceutical
and Biomedical Sciences, University of Salerno, via Ponte don Melillo, 84084 Fisciano (SA), Italy
| | - Felicetta De Cicco
- Department of Pharmaceutical
and Biomedical Sciences, University of Salerno, via Ponte don Melillo, 84084 Fisciano (SA), Italy
| | - Rita P. Aquino
- Department of Pharmaceutical
and Biomedical Sciences, University of Salerno, via Ponte don Melillo, 84084 Fisciano (SA), Italy
| | - Ernesto Reverchon
- Department of Industrial Engineering, University of Salerno, via Ponte don Melillo, 84084 Fisciano (SA),
Italy
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Fixed Bed Adsorption of Drugs on Silica Aerogel from Supercritical Carbon Dioxide Solutions. INTERNATIONAL JOURNAL OF CHEMICAL ENGINEERING 2013. [DOI: 10.1155/2013/752719] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Supercritical adsorption coupled with the high adsorption capacity of silica aerogel allows the preparation of a new kind of delivery systems of poor water soluble drugs. In order to overcome drawbacks of conventional techniques where the use of liquid solvents can cause the fracture of aerogel porous structure, in this work a new adsorption process of drugs from a supercritical mixture is proposed. Adsorption takes place from a fluid solution of the drug in supercritical CO2and ethanol as cosolvent. A fixed bed adsorption plant has been developed to allow fast mixing of fluid phase and effective contact in the adsorption column. The use of ethanol as cosolvent allows to overcome the limitation of supercritical adsorption due to low solubility of many drugs in supercritical CO2. Adsorption isotherms were measured for one-model substance, nimesulide, at 40°C, and breakthrough curve was experimentally obtained. The drug loading of the drug into silica aerogel was up to 9 wt%. The drug composite was characterized using scanning electron microscopy, and release kinetics of the adsorbed drug were also evaluated by in vitro dissolution tests. The dissolution of nimesulide from loaded aerogel is much faster than dissolution of crystalline nimesulide. Around 80% of nimesulide dissolves from the aerogel within 6 minutes, whereas dissolving 80% of the crystalline drug takes about 90 min.
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Bozbag S, Zhang L, Aindow M, Erkey C. Carbon aerogel supported nickel nanoparticles and nanorods using supercritical deposition. J Supercrit Fluids 2012. [DOI: 10.1016/j.supflu.2012.02.027] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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