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Vauloup J, Bouilhac C, Sougrati MT, Stievano L, Coppey N, Zitolo A, Monconduit L, Lacroix-Desmazes P. Lithium and cobalt extraction from LiCoO 2 assisted by p(VBPDA-co-FDA) copolymers in supercritical CO 2. Waste Manag 2024; 181:199-210. [PMID: 38643515 DOI: 10.1016/j.wasman.2024.03.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 01/30/2024] [Accepted: 03/12/2024] [Indexed: 04/23/2024]
Abstract
Supercritical CO2 (scCO2) extraction assisted by complexing copolymers is a promising process to recover valuable metals from lithium-ion batteries (LIBs). CO2, in addition to being non-toxic, abundant and non-flammable, allows an easy separation of metal-complexes from the extraction medium by depressurization, limiting the wastewater production. In this study, CO2-philic gradient copolymers bearing phosphonic diacid complexing groups (poly(vinylbenzylphosphonic diacid-co-1,1,2,2-tetrahydroperfluorodecylacrylate), p(VBPDA-co-FDA)) were synthesized for the extraction of lithium and cobalt from LiCoO2 cathode material. Notably, the copolymer was able to play the triple role of leaching agent, complexing agent and surfactant. The proof of concept for leaching, complexation and extraction was achieved, using two different extraction systems. A first extraction system used aqueous hydrogen peroxide as reducing agent while it was replaced by ethanol in the second extraction system. The scCO2 extraction conditions such as extraction time, temperature, functional copolymer concentration, and the presence of additives were optimized to improve the metals extraction from LiCoO2 cathode material, leading to an extraction efficiency of Li and Co up to ca. 75 % at 60 °C and 250 bar.
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Affiliation(s)
- Joshua Vauloup
- ICGM, Univ Montpellier, CNRS, ENSCM, Montpellier, France
| | | | - Moulay Tahar Sougrati
- ICGM, Univ Montpellier, CNRS, ENSCM, Montpellier, France; RS2E, Réseau Français sur le Stockage Electrochimique de l'Energie, FR CNRS #3459, Amiens F-80039 Cedex 1, France
| | - Lorenzo Stievano
- ICGM, Univ Montpellier, CNRS, ENSCM, Montpellier, France; RS2E, Réseau Français sur le Stockage Electrochimique de l'Energie, FR CNRS #3459, Amiens F-80039 Cedex 1, France
| | | | | | - Laure Monconduit
- ICGM, Univ Montpellier, CNRS, ENSCM, Montpellier, France; RS2E, Réseau Français sur le Stockage Electrochimique de l'Energie, FR CNRS #3459, Amiens F-80039 Cedex 1, France
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Sheikhi-Kouhsar M, Bagheri H, Alsaikhan F, Aldhalmi AK, Ahmed HH. Solubility of digitoxin in supercritical CO 2: Experimental study and modeling. Eur J Pharm Sci 2024; 195:106731. [PMID: 38387711 DOI: 10.1016/j.ejps.2024.106731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 02/05/2024] [Accepted: 02/19/2024] [Indexed: 02/24/2024]
Abstract
In this communication, the solubility of digitoxin drug in supercritical CO2 was studied at different operating conditions (311 < T (K) < 343, 120 < P (bar) < 300). The results revealed digitoxin drug solubility (in mole fraction) was between 0.095 × 10-5 to 1.12 × 10-5. In the case of thermodynamic solubility modeling, cubic and non-cubic equation of states i.e. SAFT (statistical associating fluid theory), SRK (Soave-Redlich-Kwong) and sPC-SAFT (simplified perturbed chain SAFT) EoSs and six density-based correlations (Chrastil, Kumar-Johnston (KJ), Mendez-Santiago-Teja (MST), Garlapati and Madras (GM), Bartle et al. and Sung-Shim models) were considered. All used equations indicated reasonable behavior with appropriate accuracy for the solubility of the digitoxin drug. Meanwhile, sPC-SAFT EoS and Kumar-Johnston correlation with AARD% set to 8.96 % and 6.25 %, respectively exhibited greater accuracy in fitting the solubility data. Moreover, total, solvation and vaporization enthalpies of the digitoxin/supercritical carbon dioxide binary mixture were calculated based on KJ, Chrastil and Bartle et al. models.
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Affiliation(s)
- Mohammadreza Sheikhi-Kouhsar
- Department of Chemical Engineering, School of Chemical and Petroleum Engineering, Shiraz University, 71946-84334 Shiraz, Iran
| | - Hamidreza Bagheri
- Department of Chemical Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman, 76188-68366 Kerman, Iran.
| | - Fahad Alsaikhan
- College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia; School of Pharmacy, Ibn Sina National College for Medical Studies, Jeddah, Saudi Arabia
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3
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Zhang Y, Chen H, Sun H, Liu Z, Lei B, Wu B, Feng Y. Separation of lignin derivatives from hemp fiber using supercritical CO 2, ethanol, and water at different temperatures. Int J Biol Macromol 2024; 264:130390. [PMID: 38403228 DOI: 10.1016/j.ijbiomac.2024.130390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 02/10/2024] [Accepted: 02/21/2024] [Indexed: 02/27/2024]
Abstract
The process of lignin extraction often involves intricate chemical transformations, influencing its potential for high-value utilization. By investigating the process of lignin derivatives extraction from hemp fibers using supercritical CO2, ethanol, and water, we identified the relationship between the chemical structure of lignin derivatives and temperature. This discovery contributes to controlling the chemical structure of lignin derivatives through temperature modulation. We observed that lignin derivatives extracted within the temperature range of 100-120 °C exhibited the lowest average molecular weight and polydispersity index, presenting a disordered microstructure with the highest hydroxyl content. Lignin derivatives extracted between 140 and 160 °C showed an increase in average molecular weight and polydispersity index, decreased hydroxyl content, and a gradual transformation of microstructure into spherical particles. At 180 °C, the average molecular weight and polydispersity index of lignin derivatives decreased, the microstructure of lignin derivatives showed fewer spherical particles, while its hydroxyl content exhibited a partial recovery. Chemical analysis revealed a lower degree of condensation in lignin derivatives at 100-120 °C. Between 120 and 160 °C, the degree of condensation increased. At 180 °C, extensive degradation occurred in lignin derivatives. This research advances innovative techniques for lignin derivative separation, contributing to their utilization in higher-value applications.
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Affiliation(s)
- Yunhao Zhang
- The National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640, China; National Industrial Innovation Center of Polymer Materials Co., Ltd., Guangzhou 510640, China
| | - Huan Chen
- The National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640, China; National Industrial Innovation Center of Polymer Materials Co., Ltd., Guangzhou 510640, China
| | - Hang Sun
- The National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640, China; National Industrial Innovation Center of Polymer Materials Co., Ltd., Guangzhou 510640, China
| | - Zengquan Liu
- The National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640, China; National Industrial Innovation Center of Polymer Materials Co., Ltd., Guangzhou 510640, China
| | - Bo Lei
- The National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640, China; National Industrial Innovation Center of Polymer Materials Co., Ltd., Guangzhou 510640, China
| | - Bo Wu
- The National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640, China; National Industrial Innovation Center of Polymer Materials Co., Ltd., Guangzhou 510640, China
| | - Yanhong Feng
- The National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640, China; National Industrial Innovation Center of Polymer Materials Co., Ltd., Guangzhou 510640, China.
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Periaswamy Sivagnanam S, Alaydi H, Cabral EM, Poojary MM, Karuppusamy S, Tiwari BK. Ultrasound, microwave and enzyme-assisted multiproduct biorefinery of Ascophyllum nodosum. Food Chem 2024; 433:137259. [PMID: 37672947 DOI: 10.1016/j.foodchem.2023.137259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 07/30/2023] [Accepted: 08/22/2023] [Indexed: 09/08/2023]
Abstract
This study investigated the multiproduct (fucoidans, β-glucans, proteins, carotenoids, fatty acids, amino acids and polyphenols) valorization of the invasive macroalgae Ascophyllum nodosum within a green biorefinery concept using ultrasound (US), microwave (MW) treatment followed by supercritical CO2 (SC-CO2) with co-solvent and enzymatic extraction. Water and 50% aqueous ethanol were used as green extraction solvents. The extraction methods using 50% ethanol as extraction solvent improved the yields of phenolic compounds and glucan and enhanced in vitro antioxidant activity. The characterization of SC-CO2 extracts revealed that pretreatment with US and MW improved the 2-fold yield of carotenoids, total phenolics and fatty acids. However, US/MW pretreatment and enzymatic extraction did not improve the yields of proteins and free amino acids. Overall, using concurrent green US/MW-assisted extraction methods enhanced the yields of the bioactive compounds in a short duration and provided extracts with a better antioxidant capacity in the field of food applications.
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Affiliation(s)
- Saravana Periaswamy Sivagnanam
- Department of Food Chemistry & Technology, Teagasc Food Research Centre, Ashtown, Ireland; School of Chemical and Bio Pharmaceutical Sciences, Technological University Dublin, Ireland; Department of Biological Sciences, Munster Technological University, Bishopstown, Cork T12P928, Ireland.
| | - Hadil Alaydi
- Department of Applied Science, Technological University of Shannon: Midlands and Midwest, Moylish, Co Limerick, Ireland
| | - Eduarda M Cabral
- Department of Food Chemistry & Technology, Teagasc Food Research Centre, Ashtown, Ireland
| | - Mahesha M Poojary
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark
| | - Shanmugapriya Karuppusamy
- School of Biosystems and Food Engineering, University College Dublin, Belfield, D04 V1W8 Dublin, Ireland
| | - Brijesh K Tiwari
- Department of Food Chemistry & Technology, Teagasc Food Research Centre, Ashtown, Ireland.
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Todorović N, Čanji Panić J, Pavlić B, Popović S, Ristić I, Rakić S, Rajšić I, Vukmirović S, Srđenović Čonić B, Milijašević B, Milošević N, Lalić-Popović M. Supercritical fluid technology as a strategy for nifedipine solid dispersions formulation: In vitro and in vivo evaluation. Int J Pharm 2024; 649:123634. [PMID: 38000651 DOI: 10.1016/j.ijpharm.2023.123634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 11/07/2023] [Accepted: 11/21/2023] [Indexed: 11/26/2023]
Abstract
Supercritical fluid technology (SFT) is an insufficiently investigated approach for the production of solid dispersions, it is environmentally acceptable and has a high potential for application in the pharmaceutical industry. The aim of this work was to formulate and characterize nifedipine solid dispersions (SDs) produced by the SFT and compare the results with ones obtained by the classical solvent based kneading method. The following in vitro tests were conducted: assay and yield, solvent residues, solid state characterization (FTIR, DSC, XRD), flowability, hygroscopicity, solubility, dissolution and stability. Additionally, bioavailability was examined on an animal model (Wistar rats). The formulation selection for in vivo study was performed using the multilevel categoric experimental design and the health risk assessment. Solid state characterization revealed that formulation obtained by the SFT method and higher ratio of polymer (1:5) have had nifedipine in completely amorphous form. Polymer ratio and method of SDs preparation do influence the investigation characteristics. Dissolution rate was fastest in SDs prepared by the SFT and higher polymer ration (1:5). In vivo data of selected SDs prepared by the kneading (ratio 1:1) and the SFT (ratio 1:5) showed alteration in pharmacokinetic profile after i.v. and p.o. application.
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Affiliation(s)
- Nemanja Todorović
- University of Novi Sad, Faculty of Medicine Novi Sad, Department of Pharmacy, Hajduk Veljkova 3, 21000 Novi Sad, Republic of Serbia
| | - Jelena Čanji Panić
- University of Novi Sad, Faculty of Medicine Novi Sad, Department of Pharmacy, Hajduk Veljkova 3, 21000 Novi Sad, Republic of Serbia
| | - Branimir Pavlić
- University of Novi Sad, Faculty of Technology Novi Sad, Bulevar Cara Lazara 1, 21000 Novi Sad, Republic of Serbia
| | - Senka Popović
- University of Novi Sad, Faculty of Technology Novi Sad, Bulevar Cara Lazara 1, 21000 Novi Sad, Republic of Serbia
| | - Ivan Ristić
- University of Novi Sad, Faculty of Technology Novi Sad, Bulevar Cara Lazara 1, 21000 Novi Sad, Republic of Serbia
| | - Srđan Rakić
- University of Novi Sad, Faculty of Sciences, Department of Physics, Trg Dositeja Obradovića 4, 21000 Novi Sad, Republic of Serbia
| | - Ivana Rajšić
- University of Novi Sad, Faculty of Medicine Novi Sad, Department of Pharmacology and Toxicology, Hajduk Veljkova 3, 21000 Novi Sad, Republic of Serbia
| | - Saša Vukmirović
- University of Novi Sad, Faculty of Medicine Novi Sad, Department of Pharmacology and Toxicology, Hajduk Veljkova 3, 21000 Novi Sad, Republic of Serbia
| | - Branislava Srđenović Čonić
- University of Novi Sad, Faculty of Medicine Novi Sad, Department of Pharmacy, Hajduk Veljkova 3, 21000 Novi Sad, Republic of Serbia; University of Novi Sad, Faculty of Medicine Novi Sad, Centre for Medical and Pharmaceutical Investigations and Quality Control (CEMPhIC), Hajduk Veljkova 3, 21000 Novi Sad, Republic of Serbia
| | - Boris Milijašević
- University of Novi Sad, Faculty of Medicine Novi Sad, Department of Pharmacology and Toxicology, Hajduk Veljkova 3, 21000 Novi Sad, Republic of Serbia
| | - Nataša Milošević
- University of Novi Sad, Faculty of Medicine Novi Sad, Department of Pharmacy, Hajduk Veljkova 3, 21000 Novi Sad, Republic of Serbia
| | - Mladena Lalić-Popović
- University of Novi Sad, Faculty of Medicine Novi Sad, Department of Pharmacy, Hajduk Veljkova 3, 21000 Novi Sad, Republic of Serbia; University of Novi Sad, Faculty of Medicine Novi Sad, Centre for Medical and Pharmaceutical Investigations and Quality Control (CEMPhIC), Hajduk Veljkova 3, 21000 Novi Sad, Republic of Serbia.
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Faba S, Arrieta MP, Romero J, Agüero Á, Torres A, Martínez S, Rayón E, Galotto MJ. Biodegradable nanocomposite poly(lactic acid) foams containing carvacrol-based cocrystal prepared by supercritical CO 2 processing for controlled release in active food packaging. Int J Biol Macromol 2024; 254:127793. [PMID: 37926308 DOI: 10.1016/j.ijbiomac.2023.127793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 10/15/2023] [Accepted: 10/29/2023] [Indexed: 11/07/2023]
Abstract
Compounds derived from essential oils have been used in active packaging, but their volatility and degradability negatively affect stability and leads to high release rates. The present study aimed to develop PLA bionanocomposite foams loaded with carvacrol cocrystal by supercritical CO2 and its release into a food simulant for control release in food packaging. For this purpose, 4,4'-bipyridine was used as coformer and carvacrol as active agent. Cocrystallized closed cell foams were obtained using supercritical CO2 and were characterized in terms of their physicochemical and mechanical properties, and release kinetics to a D1 simulant were evaluated as well as the antioxidant ability. A better overall mechanical behavior due to the nanoclay promoting a higher interfacial adhesion with the polymeric matrix was revealed. A higher incorporation of carvacrol was observed in samples with higher C30B content. The incorporated cocrystals showed a decrease of one order of magnitude in the estimated effective diffusion coefficient of carvacrol and showed antioxidant activity. These results suggest that the nanocomposite foam containing carvacrol-based cocrystals could be used in active packaging systems with controlled release characteristics, especially with highly volatile compounds, and can be proposed for other fields such as biomedical applications.
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Affiliation(s)
- Simón Faba
- Packaging Innovation Center (LABEN), Department of Food Science and Technology, Faculty of Technology, Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago de Chile (USACH), Santiago 9170201, Chile.
| | - Marina P Arrieta
- Departamento de Ingeniería Química Industrial y del Medio Ambiente, Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Madrid (ETSII-UPM), Calle José Gutiérrez Abascal 2, 28006 Madrid, Spain; Grupo de Investigación: Polímeros, Caracterización y Aplicaciones (POLCA), 28006 Madrid, Spain
| | - Julio Romero
- Laboratory of Membrane Separation Processes (LabProSeM), Department of Chemical Engineering and Bioprocesses, Engineering Faculty, University of Santiago de Chile (USACH), 9170201 Santiago, Chile
| | - Ángel Agüero
- Departamento de Ingeniería Química Industrial y del Medio Ambiente, Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Madrid (ETSII-UPM), Calle José Gutiérrez Abascal 2, 28006 Madrid, Spain; Institut de Tecnologia de Materials (ITM), Universitat Politècnica de València (UPV), Plaza Ferrándiz y Carbonell 1, 03801 Alcoy, Spain
| | - Alejandra Torres
- Packaging Innovation Center (LABEN), Department of Food Science and Technology, Faculty of Technology, Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago de Chile (USACH), Santiago 9170201, Chile
| | - Sara Martínez
- Packaging Innovation Center (LABEN), Department of Food Science and Technology, Faculty of Technology, Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago de Chile (USACH), Santiago 9170201, Chile
| | - Emilio Rayón
- Institut de Tecnologia de Materials, Universitat Politècnica de València (UPV), Camino de Vera, s/n, Código Postal 46022 Valencia, Spain
| | - María José Galotto
- Packaging Innovation Center (LABEN), Department of Food Science and Technology, Faculty of Technology, Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago de Chile (USACH), Santiago 9170201, Chile.
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Kumar P, Kermanshahi-Pour A, Brar SK, He QS, Rainey JK. Influence of elevated pressure and pressurized fluids on microenvironment and activity of enzymes. Biotechnol Adv 2023; 68:108219. [PMID: 37488056 DOI: 10.1016/j.biotechadv.2023.108219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2023] [Revised: 07/15/2023] [Accepted: 07/17/2023] [Indexed: 07/26/2023]
Abstract
Enzymes have great potential in bioprocess engineering due to their green and mild reaction conditions. However, there are challenges to their application, such as enzyme extraction and purification costs, enzyme recovery, and long reaction time. Enzymatic reaction rate enhancement and enzyme immobilization have the potential to overcome some of these challenges. Application of high pressure (e.g., hydrostatic pressure, supercritical carbon dioxide) has been shown to increase the activity of some enzymes, such as lipases and cellulases. Under high pressure, enzymes undergo multiple alterations simultaneously. High pressure reduces the bond lengths of molecules of reaction components and causes a reduction in the activation volume of enzyme-substrate complex. Supercritical CO2 interacts with enzyme molecules, catalyzes structural changes, and removes some water molecules from the enzyme's hydration layer. Interaction of scCO2 with the enzyme also leads to an overall change in secondary structure content. In the extreme, such changes may lead to enzyme denaturation, but enzyme activation and stabilization have also been observed. Immobilization of enzymes onto silica and zeolite-based supports has been shown to further stabilize the enzyme and provide resistance towards perturbation under subjection to high pressure and scCO2.
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Affiliation(s)
- Pawan Kumar
- Biorefining and Remediation Laboratory, Department of Process Engineering and Applied Science, Dalhousie University, 1360 Barrington Street, Halifax, Nova Scotia B3J 1Z1, Canada
| | - Azadeh Kermanshahi-Pour
- Biorefining and Remediation Laboratory, Department of Process Engineering and Applied Science, Dalhousie University, 1360 Barrington Street, Halifax, Nova Scotia B3J 1Z1, Canada.
| | - Satinder Kaur Brar
- Department of Civil Engineering, Lassonde School of Engineering, York University, North York, Toronto, Ontario M3J 1P3, Canada
| | - Quan Sophia He
- Department of Engineering, Faculty of Agriculture, Dalhousie University, Truro, NS B2N 5E3, Canada
| | - Jan K Rainey
- Department of Biochemistry & Molecular Biology, Department of Chemistry, and School of Biomedical Engineering, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada
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Namli S, Guven O, Simsek FN, Gradišek A, Sumnu G, Yener ME, Oztop M. Effects of deacetylation degree of chitosan on the structure of aerogels. Int J Biol Macromol 2023; 250:126123. [PMID: 37543264 DOI: 10.1016/j.ijbiomac.2023.126123] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Revised: 06/10/2023] [Accepted: 08/01/2023] [Indexed: 08/07/2023]
Abstract
Chitosan aerogels, obtained by (supercritical) CO2 drying of hydrogels, are novel adsorbents because of their large surface area and high porosity. Intrinsic properties of chitosan such as molecular weight (MW) and degree of deacetylation (DDA) had large impacts on the characteristics of chitosan aerogels. Although there are a few studies about the effects of solely DDA or MW on aerogel structure, none of them has focused on the mutual effects. The study aims to investigate the combined effects of MW and DDA of chitosan on aerogel properties. Hydrogels were produced in beads form by physical gelation of the chitosan solutions (2 % w/v in acetic acid of 1 %, v/v) in an alkaline environment (NaOH, 4 N). Supercritical CO2 dried aerogels were examined with respect to the bulk density, diameter as well as pore characteristics, and surface area by Barrett-Joyner-Halenda (BJH) and Brunauer-Emmett-Teller (BET) methods, respectively. Morphologies of aerogels were also examined by Scanning Electron Microscopy (SEM) images and structural changes of aerogels were observed by Fourier Transform Infrared (FTIR) Spectroscopy. Additional to BET-BJH analysis, proton relaxation dispersion was measured by Fast Field Cycling NMR (FFC-NMR) to determine the pore volume of the aerogels. Compact structures were obtained for higher MW chitosan and lower MW chitosans with higher DDA increasing the aerogel diameters. All types of aerogels obtained by different chitosan characteristics (MW and DDA) showed a porous structure and the highest DDA with the lowest MW caused the minimum bulk density with the highest water absorption rate. Although different N2 adsorption-desorption profiles were obtained in terms of pore volumes; all aerogels had Type IV isotherms with Type H1 hysteresis curve. FFC-NMR experiments showed that the coherence length values were associated with the pore volumes and FFC-NMR experiments were found to be meaningful as supportive experiments for the characterization of aerogels.
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Affiliation(s)
- Serap Namli
- Middle East Technical University, Department of Food Engineering, Ankara, Turkey.
| | - Ozge Guven
- Middle East Technical University, Department of Food Engineering, Ankara, Turkey.
| | - Feyza Nur Simsek
- Middle East Technical University, Department of Food Engineering, Ankara, Turkey.
| | - Anton Gradišek
- Jozef Stefan Institute, Department of Solid State Physics and Department of Intelligent Systems, Jamova cesta 39, SI-1000 Ljubljana, Slovenia.
| | - Gulum Sumnu
- Middle East Technical University, Department of Food Engineering, Ankara, Turkey.
| | - Meryem Esra Yener
- Middle East Technical University, Department of Food Engineering, Ankara, Turkey.
| | - Mecit Oztop
- Middle East Technical University, Department of Food Engineering, Ankara, Turkey.
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Friolli MPDS, Silva EK, Napoli DCDS, Sanches VL, Rostagno MA, Pacheco MTB. High-intensity ultrasound-based process strategies for obtaining edible sunflower (Helianthus annuus L.) flour with low-phenolic and high-protein content. Ultrason Sonochem 2023; 97:106449. [PMID: 37267822 DOI: 10.1016/j.ultsonch.2023.106449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 05/06/2023] [Accepted: 05/18/2023] [Indexed: 06/04/2023]
Abstract
The sunflower Helianthus annuus L. represents the 4th largest oilseed cultivated area worldwide. Its balanced amino acid content and low content of antinutrient factors give sunflower protein a good nutritional value. However, it is underexploited as a supplement to human nutrition due to the high content of phenolic compounds that reduce the sensory quality of the product. Thus, this study aimed at obtaining a high protein and low phenolic compound sunflower flour for use in the food industry by designing separation processes with high intensity ultrasound technology. First, sunflower meal, a residue of cold-press oil extraction processing, was defatted using supercritical CO2 technology. Subsequently, sunflower meal was subjected to different conditions for ultrasound-assisted extraction of phenolic compounds. The effects of solvent composition (water: ethanol) and pH (4 to 12) were investigated using different acoustic energies and continuous and pulsed process approaches. The employed process strategies reduced the oil content of sunflower meal by up to 90% and reduced 83% of the phenolic content. Furthermore, the protein content of sunflower flour was increased up to approximately 72% with respect to sunflower meal. The acoustic cavitation-based processes using the optimized solvent composition were efficient in breaking down the cellular structure of the plant matrix and facilitated the separation of proteins and phenolic compounds, while preserving the functional groups of the product. Therefore, a new ingredient with high protein content and potential application for human food was obtained from the residue of sunflower oil processing using green technologies.
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Affiliation(s)
| | - Eric Keven Silva
- School of Food Engineering, University of Campinas, Campinas, SP, Brazil
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10
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Sanz-Horta R, Retegi-Carrion S, Ruiz-Hernandez R, Khatami N, Elvira C, Martinez-Campos E, Rodríguez-Hernández J, Abarrategi A. Polycaprolactone with multiscale porosity and patterned surface topography prepared using sacrificial 3D printed moulds: Towards tailor-made scaffolds. Biomater Adv 2023; 151:213465. [PMID: 37236118 DOI: 10.1016/j.bioadv.2023.213465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 04/24/2023] [Accepted: 05/05/2023] [Indexed: 05/28/2023]
Abstract
Biocompatible three-dimensional porous scaffolds are widely used in multiple biomedical applications. However, the fabrication of tailor-made 3D structures with controlled and combined multiscale macroscopic-microscopic, surface and inner porosities in a straightforward manner is still a current challenge. Herein, we use multimaterial fused deposition modeling (FDM) to generate poly (vinyl alcohol) (PVA) sacrificial moulds filled with poly (Ɛ-caprolactone) (PCL) to generate well defined PCL 3D objects. Further on, the supercritical CO2 (SCCO2) technique, as well as the breath figures mechanism (BFs), were additionally employed to fabricate specific porous structures at the core and surfaces of the 3D PCL object, respectively. The biocompatibility of the resulting multiporous 3D structures was tested in vitro and in vivo, and the versatility of the approach was assessed by generating a vertebra model fully tunable at multiple pore size levels. In sum, the combinatorial strategy to generate porous scaffolds offers unique possibilities to fabricate intricate structures by combining the advantages of additive manufacturing (AM), which provides flexibility and versatility to generate large sized 3D structures, with advantages of the SCCO2 and BFs techniques, which allow to finely tune the macro and micro porosity at material surface and material core levels.
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Affiliation(s)
- Raúl Sanz-Horta
- Institute of Polymer Science and Technology, ICTP-CSIC, Department of Applied Macromolecular Chemistry, Juan de la Cierva 3, 28006 Madrid, Spain
| | - Sugoi Retegi-Carrion
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), 20014 Donostia-San Sebastian, Spain
| | - Raquel Ruiz-Hernandez
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), 20014 Donostia-San Sebastian, Spain
| | - Neda Khatami
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), 20014 Donostia-San Sebastian, Spain
| | - Carlos Elvira
- Institute of Polymer Science and Technology, ICTP-CSIC, Department of Applied Macromolecular Chemistry, Juan de la Cierva 3, 28006 Madrid, Spain
| | - Enrique Martinez-Campos
- Institute of Polymer Science and Technology, ICTP-CSIC, Department of Applied Macromolecular Chemistry, Juan de la Cierva 3, 28006 Madrid, Spain
| | - Juan Rodríguez-Hernández
- Institute of Polymer Science and Technology, ICTP-CSIC, Department of Applied Macromolecular Chemistry, Juan de la Cierva 3, 28006 Madrid, Spain.
| | - Ander Abarrategi
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), 20014 Donostia-San Sebastian, Spain; Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain.
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11
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Valluri S, Claremboux V, Kawatra S. Opportunities and challenges in CO 2 utilization. J Environ Sci (China) 2022; 113:322-344. [PMID: 34963541 DOI: 10.1016/j.jes.2021.05.043] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 05/27/2021] [Accepted: 05/31/2021] [Indexed: 06/14/2023]
Abstract
CO2 utilizations are essential to curbing the greenhouse gas effect and managing the environmental pollutant in an energy-efficient and economically-sound manner. This paper seeks to critically analyze these technologies in the context of each other and highlight the most important utilization avenues available thus far. This review will introduce and analyze each major pathway, and discuss the overall applicability, potential extent, and major limitations of each of these pathways to utilizing CO2. This will include the analysis of some previously underreported utilization avenues, including CO2 utilization in industrial filtration and the processing of raw industrial materials such as iron and alumina. The core theme of this paper is to seek to treat CO2 as a commodity instead of a liability.
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Affiliation(s)
- Sriram Valluri
- Department of Chemical Engineering, Michigan Technological University, Houghton, MI 49931, USA.
| | - Victor Claremboux
- Department of Chemical Engineering, Michigan Technological University, Houghton, MI 49931, USA
| | - Surendra Kawatra
- Department of Chemical Engineering, Michigan Technological University, Houghton, MI 49931, USA
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12
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Santos-Rosales V, Magariños B, Alvarez-Lorenzo C, García-González CA. Combined sterilization and fabrication of drug-loaded scaffolds using supercritical CO 2 technology. Int J Pharm 2022; 612:121362. [PMID: 34896562 DOI: 10.1016/j.ijpharm.2021.121362] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 12/03/2021] [Accepted: 12/04/2021] [Indexed: 01/16/2023]
Abstract
The access of biodegradable scaffolds to the clinical arena is constrained by the absence of a suitable sterilization technique for the processing of advanced polymeric materials. Sterilization with supercritical CO2 (scCO2) may circumvent some technological limitations (e.g., low temperature, no chemical residues on the material), although scCO2 can plasticize the polymer depending on the processing conditions used. In this latter case, the integration of the manufacturing and sterilization processes is of particular interest to obtain sterile and customized scaffolds in a single step. In this work, scCO2 was exploited as a concomitantly foaming and sterilizing agent for the first time, developing a one-step process for the production of vancomycin-loaded poly(ε-caprolactone) (PCL) bone scaffolds. The effect of the CO2 contact time on the sterility levels of the procedure was investigated, and the sterilization efficiency was evaluated against dry spores (Bacillus stearothermophilus, Bacillus pumilus and Bacillus atrophaeus). Vancomycin-loaded PCL scaffolds had relevant sustained release profiles for the prophylaxis of infections at the grafted area, even those caused by methicillin-resistant Staphylococcus aureus (MRSA). The biological performance of the scaffolds was evaluated in vitro regarding human mesenchymal stem cells (hMSCs) attachment and growth. Finally, the biocompatibility and angiogenic response of the manufactured sterile scaffolds was assessed in ovo through chick chorioallantoic membrane (CAM) assays.
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13
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Filiz Y, Saglam-Metiner P, Ersoy S, Yesil-Celiktas O. Supercritical carbon dioxide dried double layer laponite XLS and alginate/polyacrylamide construct and immune response. Tissue Cell 2021; 74:101712. [PMID: 34920234 DOI: 10.1016/j.tice.2021.101712] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 11/17/2021] [Accepted: 12/07/2021] [Indexed: 11/25/2022]
Abstract
Fabrication of immunocompatible tissue constructs for bone-cartilage defect regeneration is of prime importance. In this study, a double layer hydrogel was successfully synthesized, where alginate/polyacrylamide were formulated to represent cartilage layer (5-10 % (w/w) total polymer ratio) and laponite XLS (2-5-8% (w/w))/alginate/polyacrylamide formed bone layer. Hydrogels were dried by supercritical CO2 at 100 and 200 bar, 45 °C, 5 g/min CO2 flow rate for 2 h. Constructs were treated with collagen, then cellularized and embedded in cell-laden GelMA to mimic the cellular microenvironment. The optimum weight ratio of alginate/polyacrylamide:laponite XLS was 10:5 based on mechanical strength test results. The constructs yielded high porosity (91.50 m2/g) and mesoporous structure, owing to the diffusivity of CO2 at 200 bar (0.49 × 10-7 m2/s). Constructs were then treated with collagen to increase cell adhesion and ATDC5 cells were seeded in the cartilage layer, whereas hFOB cells to the bone layer. About 10-15 % higher cell viability was attained. The porous structure of the construct allowed infiltration of macrophages, promoted polarization and positively affected the behavior of macrophages, yielding a decrease in M1 markers, whereas an increase in M2 on day 4. The formulated tissue constructs would be of value in tissue engineering applications.
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Affiliation(s)
- Yagmur Filiz
- Department of Bioengineering, Faculty of Engineering, Ege University, 35100, Izmir, Turkey
| | - Pelin Saglam-Metiner
- Department of Bioengineering, Faculty of Engineering, Ege University, 35100, Izmir, Turkey
| | - Seymanur Ersoy
- Department of Bioengineering, Faculty of Engineering, Ege University, 35100, Izmir, Turkey
| | - Ozlem Yesil-Celiktas
- Department of Bioengineering, Faculty of Engineering, Ege University, 35100, Izmir, Turkey.
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14
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Duchowny A, Dupuy PM, Widerøe HC, Berg OJ, Faanes A, Paulsen A, Thern H, Mohnke O, Küppers M, Blümich B, Adams A. Versatile high-pressure gas apparatus for benchtop NMR: Design and selected applications. J Magn Reson 2021; 329:107025. [PMID: 34147853 DOI: 10.1016/j.jmr.2021.107025] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 06/07/2021] [Accepted: 06/07/2021] [Indexed: 06/12/2023]
Abstract
A simple, yet highly versatile setup is presented for benchtop NMR analyses of gases at high-pressure. It consists mostly of commercial parts and includes multiple safety features while maintaining a small size to fit into a 1.20 m wide fume hood. Pressures up to 200 bar can be adjusted independently of the sample gas-bottle pressure in a matter of seconds. Mixtures of multiple gases can be produced in situ in a mixing chamber, which also serves to adjust the pressure. The high-pressure hardware and benchtop NMR spectrometer have been tested for long-term stability and repeatability of the measurements. The versatility of the setup is demonstrated by analyzing hydrocarbon-gas with attention to linewidths as well as their 1H relaxation times, by improving the resolution of 1H NMR spectra from solid polymers with pressurized CO2, and by visualizing the ingress of gaseous and supercritical methane into liquid benzene.
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Affiliation(s)
- Anton Duchowny
- Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Templergraben 55, 52056 Aachen, Germany
| | | | | | - Ole Johan Berg
- Equinor ASA, Arkitekt Ebbells veg 10, 7053 Ranheim, Norway
| | - Audun Faanes
- Equinor ASA, Arkitekt Ebbells veg 10, 7053 Ranheim, Norway
| | | | - Holger Thern
- Baker Hughes INTEQ GmbH, Baker Hughes Strasse 1, 29221 Celle, Germany
| | - Oliver Mohnke
- Baker Hughes INTEQ GmbH, Baker Hughes Strasse 1, 29221 Celle, Germany
| | - Markus Küppers
- Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Templergraben 55, 52056 Aachen, Germany
| | - Bernhard Blümich
- Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Templergraben 55, 52056 Aachen, Germany
| | - Alina Adams
- Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Templergraben 55, 52056 Aachen, Germany.
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15
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Santos-Rosales V, Magariños B, Starbird R, Suárez-González J, Fariña JB, Alvarez-Lorenzo C, García-González CA. Supercritical CO 2 technology for one-pot foaming and sterilization of polymeric scaffolds for bone regeneration. Int J Pharm 2021; 605:120801. [PMID: 34139307 DOI: 10.1016/j.ijpharm.2021.120801] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 06/09/2021] [Accepted: 06/11/2021] [Indexed: 12/21/2022]
Abstract
Sterilization is a quite challenging step in the development of novel polymeric scaffolds for regenerative medicine since conventional sterilization techniques may significantly alter their morphological and physicochemical properties. Supercritical (sc) sterilization, i.e. the use of scCO2 as a sterilizing agent, emerges as a promising sterilization method due to the mild operational conditions and excellent penetration capability. In this work, a scCO2 protocol was implemented for the one-pot preparation and sterilization of poly(ε-caprolactone) (PCL)/poly(lactic-co-glycolic acid) (PLGA) scaffolds. The sterilization conditions were established after screening against both Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli, Pseudomonas aeruginosa) vegetative bacteria and spores of Bacillus stearothermophilus, Bacillus pumilus and Bacillus atrophaeus. The transition from the sterilization conditions (140 bar, 39 °C) to the compressed foaming (60 bar, 26 °C) was performed through controlled depressurization (3.2 bar/min) and CO2 liquid flow. Controlled depressurization/pressurization cycles were subsequently applied. Using this scCO2 technology toolbox, sterile scaffolds of well-controlled pore architecture were obtained. This sterilization procedure successfully achieved not only SAL-6 against well-known resistant bacteria endospores but also improved the scaffold morphologies compared to standard gamma radiation sterilization procedures.
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16
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Rostamitabar M, Subrahmanyam R, Gurikov P, Seide G, Jockenhoevel S, Ghazanfari S. Cellulose aerogel micro fibers for drug delivery applications. Mater Sci Eng C Mater Biol Appl 2021; 127:112196. [PMID: 34225849 DOI: 10.1016/j.msec.2021.112196] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 05/10/2021] [Accepted: 05/15/2021] [Indexed: 11/22/2022]
Abstract
Textile engineering can offer a multi-scale toolbox via various fiber or textile fabrication methods to obtain woven or nonwoven aerogels with different structural and mechanical properties to overcome the current limitations of polysaccharide-based aerogels, such as poor mechanical properties and undeveloped shaping techniques. Hereby, a high viscous solution of microcrystalline cellulose and zinc chloride hydrate was wet spun to produce mono and multi-filament alcogel microfibers. Subsequently, cellulose aerogel fibers (CAF) were produced and impregnated with model drugs using supercritical CO2 processes. Fibers were characterized in terms of morphology and textural properties, thermal stability, mechanical properties, and in vitro biological and drug release assessments. Loaded and non-loaded CAFs proved to have a macro-porous outer shell and a nano-porous inner core with interconnected pore structure and a specific area in the range of 100-180 m2/g. The CAFs with larger diameter (d ~ 235 μm) were able to form knitted mesh while lower diameter fibers (d ~ 70 μm) formed needle punched nonwoven textiles. Humidity and water uptake assessments indicated that the fibrous structures were highly moisture absorbable and non-toxic with immediate drug release profiles due to the highly open interconnected porous structure of the fibers. Finally, CAFs are propitious to be further developed for biomedical applications such as drug delivery and wound care.
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17
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Yu Y, Wang J. Preparation of graphene/PMMA composites with assistance of ultrasonic wave under supercritical CO 2 conditions. Ultrason Sonochem 2021; 73:105487. [PMID: 33578277 PMCID: PMC7881264 DOI: 10.1016/j.ultsonch.2021.105487] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2020] [Revised: 01/15/2021] [Accepted: 01/20/2021] [Indexed: 05/11/2023]
Abstract
The two-dimensional material graphene has many excellent physicochemical properties such as large specific surface area, high electron migration rate, good chemical properties, good thermal conductivity, high elastic modulus and mechanical strength that make it very valuable for theoretical research and application in the preparation of graphene/polymer composites. In this paper, the effects of ultrasonic intensity and reaction time on the molecular weight and yield of PMMA under supercritical CO2 conditions were investigated. It was found that there are threshold and optimal values of ultrasonic intensity for initiating the reaction in supercritical CO2 system. The threshold value is 150 W/cm2 and the optimal ultrasonic intensity value is 225 W/cm2. There is also an optimal value of ultrasonic initiation time for ultrasonic initiation polymerization. Combining the reaction yield and the molecular weight of the product, 2 h of ultrasonic initiation is a suitable initiation reaction time. Based on the synthesis of PMMA by ultrasonic excitation, the preparation of Graphene/PMMA composites by ultrasound assistance was also investigated. The TG and DTG characterization of PMMA and complex materials prepared by ultrasonic excitation showed that the radicals generated by ultrasonic excitation were uniformly distributed and did not generate unsaturated double bonded polymers. The electrical conductivity of the Graphene/PMMA composites prepared by ultrasonic excitation at a graphene content of 1 wt% increased to 1.13 × 10-1 S/cm, which is better than that of the Graphene/PMMA prepared by in situ polymerization. This may be attributed to the ultrasound-assisted supercritical CO2 fluid action that resulted in a more uniform distribution of Graphene mixed with PMMA in the prepared composites. Therefore, it is of important practical significance for the preparation of Graphene/PMMA composites by ultrasound-induced polymerization.
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Affiliation(s)
- Yuanyuan Yu
- College of Life Sciences, Northwest University, Xi'an 710069, Shaanxi, China; Shaanxi Key Laboratory of Degradable Biomedical Materials, Shaanxi R&D Center of Biomaterials and Fermentation Engineering, School of Chemical Engineering, Northwest University, Xi'an 710069, Shaanxi, China; School of Chemistry and Chemical Engineering, Shaanxi Xueqian Normal Universtiy, Xi'an 710100, Shaanxi, China
| | - Jing Wang
- School of Automotive and Transportation Engineering, Shenzhen Polytechnic, China.
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18
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Aggarwal S, Hakovirta M. Supercritical carbon dioxide drying of municipal sewage sludge - Novel waste-to-energy valorization pathway. J Environ Manage 2021; 285:112148. [PMID: 33588163 DOI: 10.1016/j.jenvman.2021.112148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 02/03/2021] [Accepted: 02/04/2021] [Indexed: 06/12/2023]
Abstract
Eighty percent of the world's wastewater is discharged back into nature without reuse and further treatment and solid byproduct of wastewater is either spread on land or landfilled. The valorization of municipal sewage sludge for energy use is a major opportunity for sustainable energy applications. This includes effective dewatering and drying of the sludge in addition to producing biogas during the anaerobic digestion. Supercritical CO 2 extraction process was investigated for the purpose of drying municipal sewage sludge. Remarkably our results showed that after sCO2 processing the higher heating value (HHV) of sludge at wet basis moisture content of 52% was 14 MJ/kg and thus higher than the HHV of brown coal with similar moisture level (12 MJ/kg). Our research also shows that under specific conditions sCO2 extraction reduces the moisture content of the municipal sludge from 89% to 53% in 15 min. Although, more research is needed this dewatering process could be considerably less energy intensive than conventional thermal and other drying processes. Another benefit is extraction of micro pollutants by sCO2 treatment and thus making the dried sludge more useable in energy applications as per regulations. Our results show an alternative and novel pathway for highly effective dewatering and drying of municipal and other types of sludge.
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Affiliation(s)
- S Aggarwal
- Department of Forest Biomaterials, North Carolina State University, Raleigh, USA
| | - M Hakovirta
- Department of Forest Biomaterials, North Carolina State University, Raleigh, USA.
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19
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Sun G, Ren H, Shi Z, Zhang L, Wang Z, Zhan K, Yan Y, Yang J, Zhao B. V 2O 5/vertically-aligned carbon nanotubes as negative electrode for asymmetric supercapacitor in neutral aqueous electrolyte. J Colloid Interface Sci 2021; 588:847-856. [PMID: 33309246 DOI: 10.1016/j.jcis.2020.11.126] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 11/28/2020] [Accepted: 11/30/2020] [Indexed: 12/11/2022]
Abstract
Development of aqueous asymmetric supercapacitors (ASCs) is often limited by low specific capacitance of negative electrodes. Herein, a composite electrode with tiny vanadium pentoxide (V2O5) nanoparticles homogeneously decorated in vertically-aligned carbon nanotube arrays (VACNTs) is prepared by supercritical CO2 impregnation and subsequent annealing, and used as binder-free negative electrode for aqueous ASCs. Owing to its unique three-dimensional (3D) hierarchical nanostructure, the V2O5/VACNTs (VN) electrodes exhibit an ideal specific capacitance of 284 F g-1 in the potential range of -1.1 to 0 V vs SCE at 2 A g-1 and outstanding cycling stability in the Na2SO4 aqueous solution. An aqueous ASC device possessing wide potential range of 1.7 V was constructed with pure VACNTs and VN-350 as the positive and negative electrodes, respectively. The ASC delivers a high energy density of 32.3 Wh kg-1 at a power density of 118 W kg-1 and satisfactory cycling life with capacitance retention of 76% after 5000 cycles.
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Affiliation(s)
- Gan Sun
- School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Hao Ren
- School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Zhongting Shi
- School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Lu Zhang
- School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Zhuo Wang
- School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Ke Zhan
- School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Ya Yan
- School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Junhe Yang
- School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Bin Zhao
- School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.
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20
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Asafu-Adjaye O, Via B, Sastri B, Banerjee S. Displacement dewatering of sludge with supercritical CO 2. Water Res 2021; 190:116764. [PMID: 33383345 DOI: 10.1016/j.watres.2020.116764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 12/14/2020] [Accepted: 12/19/2020] [Indexed: 06/12/2023]
Abstract
Supercritical CO2 (sCO2) displaces water from wastewater, alum, and papermill sludge. The sCO2 appears to enter the sludge matrix through viscous fingering through the entrained water. Because the water removed far exceeds the solubility of water in sCO2, it must be displaced by the sCO2 rather than dissolved out. Adding a small amount of soap to the sludge converts some of the bound water into free water, which can then be displaced by sCO2. Application of the sCO2 in multiple stages greatly enhances dewatering as compared to a single stage process. Approximately 70, 70 and 85% of the initial water can be removed from alum, wastewater and paper sludges, respectively, through a five-stage process. Staged application of sCO2 doubles the efficiency of water removal over a single-stage process of the same duration. It is proposed that when the sCO2 entrained in the sludge is decompressed between stages some of the water is explosively displaced by the expanding CO2.
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Affiliation(s)
- Osei Asafu-Adjaye
- School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL 36849, United States
| | - Brian Via
- School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL 36849, United States
| | - Bhima Sastri
- US Department of Energy, 19901 Germantown Road, Germantown, MD 20874, United States
| | - Sujit Banerjee
- School of Chemical & Biomolecular Engineering, Georgia Tech, Atlanta, GA 30332, United States.
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21
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Xia D, Maurice A, Leybros A, Lee JM, Grandjean A, Gabriel JCP. On-line spectroscopic study of brominated flame retardant extraction in supercritical CO 2. Chemosphere 2021; 263:128282. [PMID: 33297226 DOI: 10.1016/j.chemosphere.2020.128282] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Revised: 09/03/2020] [Accepted: 09/05/2020] [Indexed: 06/12/2023]
Abstract
Removal of brominated flame retardants (BFRs) from polymers before disposal or recycling will alleviate negative environmental effects and ensure safe usage of recycled products. Extraction of BFRs in supercritical CO2 is appealing but also presents challenges to industries due to limited solubility and lack of kinetic studies. For a more comprehensive evaluation of supercritical extraction potentialities, we (i) developed an on-line pressure apparatus that is compatible with both the FTIR and UV-vis spectrometers to enable kinetic and thermodynamic studies; (ii) studied kinetic extraction involving three conventional and two novel BFRs as well as three typical polymeric matrix. Solubilities were determined using the gravimetric method or X-ray fluorescence. FTIR exhibited a superior applicability compared to UV-vis in the following BFR extraction's time-dependency binary and ternary systems. We observed that faster stirring speed, higher temperature, and finer particle size can accelerate the overall extraction kinetics. In binary systems, it took less than 2 h to achieve equilibrium for each BFR at 60 °C, 25 MPa and 1000 rpm. In the presence of polymeric matrix, slower extraction kinetics were observed due to the occurrence of competitive dissolution and molecular diffusion within the matrix. Mathematical models derived from irreversible desorption and Fick's diffusion laws fitted well with the observed extraction kinetics of BFRs, thus enabling us to identify the rate-determining step. The high solubilization rate coefficients that we measured for BFRs revealed that the dynamic extraction process in up-scaling design could compensate for the low solubility with flowing supercritical CO2.
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Affiliation(s)
- Dong Xia
- Nanyang Technological University, Energy Research Institute @ NTU (ERI@N), SCARCE Laboratory 637459, Singapore
| | - Ange Maurice
- Nanyang Technological University, Energy Research Institute @ NTU (ERI@N), SCARCE Laboratory 637459, Singapore
| | | | - Jong-Min Lee
- Nanyang Technological University, Energy Research Institute @ NTU (ERI@N), SCARCE Laboratory 637459, Singapore; Nanyang Technological University, School of Chemical and Biomedical Engineering, 637459, Singapore
| | | | - Jean-Christophe P Gabriel
- Nanyang Technological University, Energy Research Institute @ NTU (ERI@N), SCARCE Laboratory 637459, Singapore; Université Paris-Saclay, CEA, CNRS, NIMBE, 91191, Gif-sur-Yvette, France.
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22
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Asaro L, Gratton M, Poirot N, Seghar S, Aït Hocine N. Devulcanization of natural rubber industry waste in supercritical carbon dioxide combined with diphenyl disulfide. Waste Manag 2020; 118:647-654. [PMID: 33011542 DOI: 10.1016/j.wasman.2020.09.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 08/28/2020] [Accepted: 09/12/2020] [Indexed: 06/11/2023]
Abstract
The elimination of rubber wastes without affecting the environment is one of the most important challenges of the 21st century waste management. Accordingly, the present work is focused on the recycling of natural rubber (NR) industry waste by means of devulcanization in supercritical carbon dioxide (scCO2) atmosphere. With that aim, a novel device allowing to perform rubber devulcanization was developed. It consists of a triaxial compression reactor integrated into a dynamic hydraulic universal testing machine with a heating chamber. NR industry waste was devulcanized in the mentioned device at different temperatures, in scCO2 by using diphenyl disulfide (DD) as devulcanizing reagent. The devulcanization degree and quality of the treated materials were evaluated by the swelling test combined with the Horikx theory. It was appeared that a successful devulcanization, with almost no degradation, was obtained, and the devulcanization degree reached maximum value of ~90%. Thermogravimetric tests and scanning electron microscopy (SEM) images strengthened these results. Finally, it was concluded that the developed device is appropriate to perform rubber recycling, which contributes to the progress in the environmental protection.
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Affiliation(s)
- Lucia Asaro
- Institute of Materials Science and Technology (INTEMA), University of Mar del Plata and National Research Council (CONICET), Av. Colón 10850, 7600 Mar del Plata, Argentina.
| | - Michel Gratton
- INSA CVL, Univ. Tours, Univ. Orléans, LaMé, 3 rue de la Chocolaterie, CS 23410, 41034 Blois Cedex, France.
| | - Nathalie Poirot
- IUT de Blois, 15 rue de la Chocolaterie, C.S. 2903, 41029 Blois, France.
| | - Said Seghar
- PHENIX TECHNOLOGIES, 29 Rue de Champfroid, 28800 Sancheville, France
| | - Nourredine Aït Hocine
- INSA CVL, Univ. Tours, Univ. Orléans, LaMé, 3 rue de la Chocolaterie, CS 23410, 41034 Blois Cedex, France.
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23
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Jiang Y, Feng Y, Lei B, Zhong H. Impact mechanisms of supercritical CO 2-ethanol-water on extraction behavior and chemical structure of eucalyptus lignin. Int J Biol Macromol 2020; 161:1506-1515. [PMID: 32771515 DOI: 10.1016/j.ijbiomac.2020.07.318] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 07/16/2020] [Accepted: 07/26/2020] [Indexed: 11/25/2022]
Abstract
A compounded medium of supercritical CO2, ethanol, and water (SEW) was used to extract lignin from eucalyptus fiber and the mechanism of the extraction was studied. Compared with the extraction method based on high-temperature ethanol (HTE), the lignin yield of the SEW method was 49.7% higher with higher average molecular weight. Physical and chemical synergies occurred during the extraction process. SEW compound medium penetrated eucalyptus fiber cell walls because of strong permeability, while the fast discharge of the compounded medium facilitated efficient lignin dissociation and removal. Carbonic acid formed from CO2 and water under high temperature and pressure can provide an acidic environment to effectively degrade hemicellulose. Formaldehyde formed from CO2 and ethanol in the process also prevented condensation of the extracted lignin fragments. The obtained lignin had high content of β-O-4 linkages and syringyl units.
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Affiliation(s)
- Yueping Jiang
- Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, South China University of Technology, Guangzhou 510641, PR China; Key Laboratory of Polymer Processing Engineering, Ministry of Education, South China University of Technology, Guangzhou 510641, PR China; National Engineering Research Center of Novel Equipment for Polymer Processing, South China University of Technology, Guangzhou 510641, PR China.
| | - Yanhong Feng
- Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, South China University of Technology, Guangzhou 510641, PR China; Key Laboratory of Polymer Processing Engineering, Ministry of Education, South China University of Technology, Guangzhou 510641, PR China; National Engineering Research Center of Novel Equipment for Polymer Processing, South China University of Technology, Guangzhou 510641, PR China.
| | - Bo Lei
- Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, South China University of Technology, Guangzhou 510641, PR China; Key Laboratory of Polymer Processing Engineering, Ministry of Education, South China University of Technology, Guangzhou 510641, PR China; National Engineering Research Center of Novel Equipment for Polymer Processing, South China University of Technology, Guangzhou 510641, PR China.
| | - Huiting Zhong
- Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, South China University of Technology, Guangzhou 510641, PR China; Key Laboratory of Polymer Processing Engineering, Ministry of Education, South China University of Technology, Guangzhou 510641, PR China; National Engineering Research Center of Novel Equipment for Polymer Processing, South China University of Technology, Guangzhou 510641, PR China.
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24
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Godoy-Gallardo M, Portolés-Gil N, López-Periago AM, Domingo C, Hosta-Rigau L. Multi-layered polydopamine coatings for the immobilization of growth factors onto highly-interconnected and bimodal PCL/HA-based scaffolds. Mater Sci Eng C Mater Biol Appl 2020; 117:111245. [PMID: 32919623 DOI: 10.1016/j.msec.2020.111245] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 06/05/2020] [Accepted: 06/27/2020] [Indexed: 11/28/2022]
Abstract
For bone tissue engineering applications, scaffolds that mimic the porous structure of the extracellular matrix are highly desirable. Herein, we employ a PCL/HA-based scaffold with a double-scaled architecture of small pores coupled to larger ones. To improve the osteoinductivity of the scaffold, we incorporate two different growth factors via polydopamine (PDA) coating. As a first step, we identify the maximum amount of PDA that can be deposited onto the scaffold. Next, to allow for the deposition of a second PDA layer which, in turn, will allow to increase the loading of growth factors, we incorporate a dithiol connecting layer. The thiol groups covalently react with the first PDA coating through Michael addition while also allowing for the incorporation of a second PDA layer. We load the first and second PDA layers with bone morphogenic protein-2 (BMP2) and vascular endothelial growth factor (VEGF), respectively, and evaluate the osteogenic potential of the functionalised scaffold by cell viability, alkaline phosphatase activity and the expression of three different osteogenesis-related genes of pre-seeded human mesenchymal stem cells. Through these studies, we demonstrate that the osteogenic activity of the scaffolds loaded with both BMP2 and VEGF is greater than scaffolds loaded only with BMP2. Importantly, the osteoinductivity is higher when the scaffolds are loaded with BMP2 and VEGF in two different PDA layers. Taken together, these results indicate that the as-prepared scaffolds could be a useful construct for bone-tissue applications.
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Affiliation(s)
- Maria Godoy-Gallardo
- Department of Health Technology, Centre for Nanomedicine and Theranostics, DTU Health Tech, Technical University of Denmark, Produktionstorvet, Building 423, 2800 Kgs. Lyngby, Denmark
| | - Núria Portolés-Gil
- Institute of Materials Science of Barcelona (ICMAB-CSIC), Campus de la UAB s/n, 08193 Bellaterra, Spain
| | - Ana M López-Periago
- Institute of Materials Science of Barcelona (ICMAB-CSIC), Campus de la UAB s/n, 08193 Bellaterra, Spain
| | - Concepción Domingo
- Institute of Materials Science of Barcelona (ICMAB-CSIC), Campus de la UAB s/n, 08193 Bellaterra, Spain
| | - Leticia Hosta-Rigau
- Department of Health Technology, Centre for Nanomedicine and Theranostics, DTU Health Tech, Technical University of Denmark, Produktionstorvet, Building 423, 2800 Kgs. Lyngby, Denmark.
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25
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Yin D, Mi J, Zhou H, Wang X, Tian H. Fabrication of branching poly (butylene succinate)/cellulose nanocrystal foams with exceptional thermal insulation. Carbohydr Polym 2020; 247:116708. [PMID: 32829836 DOI: 10.1016/j.carbpol.2020.116708] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2020] [Revised: 06/24/2020] [Accepted: 06/27/2020] [Indexed: 01/15/2023]
Abstract
Branching poly (butylene succinate) (BPBS) nanocomposite foams incorporated with cellulose nanocrystals (CNCs) were prepared by supercritical CO2. Surface modification of CNCs by acetylation was achieved through replacing hydrophilic hydroxyl groups with hydrophobic acetyl groups, which improved the dispersibility of CNCs significantly. The crystallite sizes of CNCs and acetylated CNCs were calculated by Scherrer's formula as 25 and 19 nm, respectively. The initial crystallization temperature of diverse poly (butylene succinate) (PBS) specimens, a crucial factor for regulating cell nucleation type, increased remarkably by 11.8 °C as well as their storage modulus increased by 2 orders of magnitudes, due to branching reaction and bio-filler addition. BPBS/CNCs foam possessed a high volume expansion ratio as 37.1 times and displayed an exceptional thermal conductivity as 0.021 W(m K)-1. This study provided a promising potential strategy to develop exceptional thermal-insulation polymer foams for composite structures, energy conservation and environment protection.
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26
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Zhang X, Li LF, Du ZF, Hao XL, Cao L, Luan ZD, Wang B, Xi SC, Lian C, Yan J, Sun WD. Discovery of supercritical carbon dioxide in a hydrothermal system. Sci Bull (Beijing) 2020; 65:958-964. [PMID: 36747429 DOI: 10.1016/j.scib.2020.03.023] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Revised: 03/05/2020] [Accepted: 03/06/2020] [Indexed: 11/19/2022]
Abstract
Supercritical CO2 appearing as bubbles in hydrothermal vents was identified in the south part of the Okinawa Trough using in situ Raman spectroscopy. Significantly, the N2 peak in supercritical CO2 is much larger than those in seawater and vent fluids, indicating that supercritical CO2 enriches N2 from the surrounding environment. Considering that the partial pressures of CO2 and N2 in the Earth's proto-atmosphere were ~10-20 MPa, supercritical CO2 with high N2 was likely the dominant CO2 phase near the water-air interface in the early history of the Earth, which promoted the synthesis, pre-enrichment and preservation of amino acids and other organic matters that are essential to the origin of life.
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Affiliation(s)
- Xin Zhang
- Key Labortory of Marine Geology and Environment & Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Laboratory for Marine Geology, Pilot Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China.
| | - Lian-Fu Li
- Key Labortory of Marine Geology and Environment & Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zeng-Feng Du
- Key Labortory of Marine Geology and Environment & Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
| | - Xi-Luo Hao
- Laboratory for Marine Mineral Resources, Pilot Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China; Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China
| | - Lei Cao
- Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
| | - Zhen-Dong Luan
- Key Labortory of Marine Geology and Environment & Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
| | - Bing Wang
- Key Labortory of Marine Geology and Environment & Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shi-Chuan Xi
- Key Labortory of Marine Geology and Environment & Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chao Lian
- Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
| | - Jun Yan
- Key Labortory of Marine Geology and Environment & Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Laboratory for Marine Mineral Resources, Pilot Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China
| | - Wei-Dong Sun
- Key Labortory of Marine Geology and Environment & Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China; Laboratory for Marine Mineral Resources, Pilot Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China; Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China.
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27
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Oparin RD, Ivlev DV, Kiselev MG. Conformational equilibria of pharmaceuticals in supercritical CO 2, IR spectroscopy and quantum chemical calculations. Spectrochim Acta A Mol Biomol Spectrosc 2020; 230:118072. [PMID: 31978693 DOI: 10.1016/j.saa.2020.118072] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Revised: 12/18/2019] [Accepted: 01/13/2020] [Indexed: 06/10/2023]
Abstract
In this work we demonstrate a self-consistent effective technique of analyzing the conformational equilibria of active pharmaceutical ingredient (API) molecules dissolved in supercritical carbon dioxide in a wide range of thermodynamic parameters of state. This approach can be useful for pharmaceutics when the crystalline forms of pharmaceuticals with a high purity degree and desirable polymorphism are produced using CO2-based supercritical fluids technologies. Within this approach we use a combination of quantum chemical calculations and in situ IR spectroscopy. Quantum chemical calculations allow us to perform the initial conformational search and to determine the energy characteristics of the most stable conformers of API and the energy barriers of transitions between them. IR spectroscopy gives the information on the equilibrium of the most stable conformers of pharmaceuticals dissolved in scCO2 in the thermodynamic parameter range of interest. Finally we validate our approach by applying it to the study of carbamazepine dissolved in scCO2 being in permanent contact with an excess of crystalline carbamazepine as an example. The conformational search for carbamazepine molecules in scCO2 was also performed using molecular dynamics simulation for comparison with the results obtained by the technique presented in this paper.
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Affiliation(s)
- R D Oparin
- G. A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, Ivanovo, Russia.
| | - D V Ivlev
- G. A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, Ivanovo, Russia
| | - M G Kiselev
- G. A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, Ivanovo, Russia
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28
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Park K, Kim T, Park J, Yan X, Kim H. Development of a carbamate-conjugated catechol ligand and its application to Cs extraction from contaminated soil by using supercritical CO 2. Chemosphere 2020; 242:125210. [PMID: 31689638 DOI: 10.1016/j.chemosphere.2019.125210] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 10/21/2019] [Accepted: 10/23/2019] [Indexed: 06/10/2023]
Abstract
Extraction of radioactive Cs from contaminated soil is a crucial aspect of remediation after nuclear accidents. For this purpose, we have developed a new type of ligand, carbamate-conjugated catechol, to assist in metal extraction by using supercritical CO2 (SCCO2). The synthesis process for this ligand is relatively simple, and the carbamate-conjugated catechol ligand dissolves well in SCCO2. The measured ligand distribution coefficient increased according to a power law with an exponent of 1.7 as the ligand concentration increased, indicating that approximately two ligand molecules are needed to extract one Cs ion. The roles of additives (ligand, co-ligand, and water) were limited when they were used separately, but the combination of these additives was important. We tested 27 combinations of these three additives for extracting Cs from artificially contaminated sea sand. A quantitative analysis indicated that the ligand had the strongest influence on Cs extraction, followed by water, and the co-ligand. The carbamate-conjugated catechol ligand was then used for Cs extraction from artificially contaminated real soil. Three types of soil were prepared: coarse soil (particle size = 0.5-1 mm), medium soil (particle size = 0.2-0.5 mm), and fine soil (particle size < 0.2 mm). The Cs fractions extracted from the coarse, medium, and fine soils were measured to be 95%, 91% and 70% of the Cs fraction extracted from sea sand, respectively, which indicates the existence of a surface area effect. Additionally, we suspect that Cs undergoes chemical interaction on the surface of real soil.
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Affiliation(s)
- Kwangheon Park
- Department of Nuclear Engineering, Kyung Hee University, Yongin-si, Republic of Korea.
| | - Taehun Kim
- Korea Institute of Nuclear Safety, Daejun, Republic of Korea
| | - Jihey Park
- Korea Foundation of Nuclear Safety, Seongnam-si, Republic of Korea
| | - Xinhao Yan
- Department of Applied Chemistry, Kyung Hee University, Yongin-si, Republic of Korea
| | - Hakwon Kim
- Department of Applied Chemistry, Kyung Hee University, Yongin-si, Republic of Korea
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29
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Ramos-Andrés M, Andrés-Iglesias C, García-Serna J. Production of molecular weight fractionated hemicelluloses hydrolyzates from spent coffee grounds combining hydrothermal extraction and a multistep ultrafiltration/diafiltration. Bioresour Technol 2019; 292:121940. [PMID: 31419707 DOI: 10.1016/j.biortech.2019.121940] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 07/29/2019] [Accepted: 07/30/2019] [Indexed: 05/24/2023]
Abstract
Spent coffee grounds are a huge residual stream from instant coffee makers. The production of spent coffee oil and molecular weight fractionated hemicellulose hydrolysates via supercritical CO2 and a hydrothermal treatment followed by concentration, separation, and purification through cascade ultrafiltration/diafiltration (30-10-5 kDa) was studied. Hemicelluloses extraction yield reached 3.49 g/100 g of dry defatted spent coffee after 40 min at 160 °C. The ultrafiltration system allowed concentrating up to 5-fold certain groups of hemicellulose, being most of them retained in the first membrane. Hemicellulose concentration and molecular weight of the feed exerted a great influence on the mass transfer through the membrane due to the formation of aggregates. However, purification through diafiltration allowed both to decrease by-products retentions from 45.6% to 8.7%, increasing the molecular weight of each fraction. Six hemicellulose products were obtained with purities between 83.7 and 97.8 wt% and weight-average molecular weights between 1641 and 49,733 Da.
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Affiliation(s)
- Marta Ramos-Andrés
- High Pressure Processes Group, BioEcoUVa Research Institute on Bioeconomy and Department of Chemical Engineering and Environmental Technology, EII Sede Mergelina, University of Valladolid, 47011 Valladolid, Spain
| | - Cristina Andrés-Iglesias
- High Pressure Processes Group, BioEcoUVa Research Institute on Bioeconomy and Department of Chemical Engineering and Environmental Technology, EII Sede Mergelina, University of Valladolid, 47011 Valladolid, Spain
| | - Juan García-Serna
- High Pressure Processes Group, BioEcoUVa Research Institute on Bioeconomy and Department of Chemical Engineering and Environmental Technology, EII Sede Mergelina, University of Valladolid, 47011 Valladolid, Spain.
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30
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Milovanovic S, Markovic D, Mrakovic A, Kuska R, Zizovic I, Frerich S, Ivanovic J. Supercritical CO 2 - assisted production of PLA and PLGA foams for controlled thymol release. Mater Sci Eng C Mater Biol Appl 2019; 99:394-404. [PMID: 30889714 DOI: 10.1016/j.msec.2019.01.106] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 11/21/2018] [Accepted: 01/23/2019] [Indexed: 12/19/2022]
Abstract
Amorphous, medical grade poly(d,l-lactic acid) (PLA) and poly(d,l-lactic-co-glycolic acid) (PLGA) were used to develop systems for controlled release of a natural bioactive substance - thymol. Supercritical carbon dioxide (scCO2) was successfully used both as an impregnation medium for thymol incorporation into the polymer matrix and a foaming agent in a single-step batch process. Impregnation of samples using low to moderate scCO2 densities (273 kg/m3 and 630 kg/m3) and short processing times (2 h and 4 h) enabled thymol loading of 0.92%-6.62% and formation of microcellular foams upon system depressurization. Thymol effect on structural and thermal properties on foamed samples was proven by FTIR and DSC. The effect of CO2 under elevated pressure on the neat polymers was analysed by high pressure DSC. Foaming of polymers with lower molecular weight by CO2 of higher density yielded foams with smaller pores. All tested foams released thymol in a controlled manner in phosphate buffered saline (PBS) at 37 °C within 3 to 6 weeks. Higher loading and lower cell density favoured thymol release rate, while its concentration in PBS for the tested period depended on foam interaction with the medium. Representative PLGA foam sample with the highest thymol loading (6.62%) showed controlled thymol release within 72 h in mediums having pH values from 1.1 to 7.4.
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Affiliation(s)
- Stoja Milovanovic
- University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, 11000 Belgrade, Serbia
| | - Darka Markovic
- University of Belgrade, Innovation Centre of Faculty of Technology and Metallurgy, Karnegijeva 4, 11000 Belgrade, Serbia
| | - Ana Mrakovic
- Vinča Institute of Nuclear Sciences, Department of Theoretical and Condensed Matter Physics, 11001 Belgrade, Serbia
| | - Robert Kuska
- Ruhr-University Bochum, Institute of Thermo and Fluid Dynamics, Universitätsstraβe 150, 44801 Bochum, Germany
| | - Irena Zizovic
- Wroclaw University of Science and Technology, Faculty of Chemistry, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
| | - Sulamith Frerich
- Ruhr-University Bochum, Institute of Thermo and Fluid Dynamics, Universitätsstraβe 150, 44801 Bochum, Germany
| | - Jasna Ivanovic
- University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, 11000 Belgrade, Serbia.
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31
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Leybros A, Segond N, Grandjean A. Remediation of 137Cs-contaminated concrete rubble by supercritical CO 2 extraction. Chemosphere 2018; 208:838-845. [PMID: 30068026 DOI: 10.1016/j.chemosphere.2018.06.051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2018] [Revised: 05/31/2018] [Accepted: 06/06/2018] [Indexed: 06/08/2023]
Abstract
The removal of cesium contamination is a critical issue for the recycling of concrete rubble in most decommissioning operations. The high solvent strength and diffusivity of supercritical CO2 make it an attractive choice as vector for extractant system in this context. Experimental extraction runs have been carried out in a radioactive environment on rubble contaminated with 137Cs. The best extraction system was found to be CalixOctyl (25,27-Bis(1-octyloxy)calix[4]arene-crown-6, 1,3-alternate) with pentadecafluorooctanoic acid as a modifier. The effects of various operating parameters were investigated, namely the coarseness of rubble, the temperature of supercritical CO2, the residual water and initial cesium concentrations, and the amounts of extractant and modifier used. The yields from direct extraction were low (<30%), because of the virtually irreversible sorption of Cs in concrete. The best extraction yield of ∼55% was achieved by leaching concrete rubble with nitric acid prior to supercritical CO2 extraction.
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Affiliation(s)
- Antoine Leybros
- CEA, DEN, Univ. Montpellier, DE2D, SEAD, LPSD, F30207 Bagnols sur Cèze, France.
| | - Nathalie Segond
- ORANO Cycle, 1 place Jean Millier, F92084 La Defense, France
| | - Agnès Grandjean
- CEA, DEN, Univ. Montpellier, DE2D, SEAD, LPSD, F30207 Bagnols sur Cèze, France
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32
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Sagisaka M, Ono S, James C, Yoshizawa A, Mohamed A, Guittard F, Enick RM, Rogers SE, Czajka A, Hill C, Eastoe J. Anisotropic reversed micelles with fluorocarbon-hydrocarbon hybrid surfactants in supercritical CO 2. Colloids Surf B Biointerfaces 2018; 168:201-210. [PMID: 29276082 DOI: 10.1016/j.colsurfb.2017.12.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2017] [Revised: 11/28/2017] [Accepted: 12/09/2017] [Indexed: 11/19/2022]
Abstract
Previous work (M. Sagisaka, et al. Langmuir 31 (2015) 7479-7487), showed the most effective fluorocarbon (FC) and hydrocarbon (HC) chain lengths in the hybrid surfactants FCm-HCn (sodium 1-oxo-1-[4-(perfluoroalkyl)phenyl]alkane-2-sulfonates, where m = FC length and n = HC length) were m and n = 6 and 4 for water solubilization, whereas m 6 and n 6, or m 6 and n 5, were optimal chain lengths for reversed micelle elongation in supercritical CO2. To clarify why this difference of only a few methylene chain units is so effective at tuning the solubilizing power and reversed micelle morphology, nanostructures of water-in-CO2 (W/CO2) microemulsions were investigated by high-pressure small-angle neutron scattering (SANS) measurements at different water-to-surfactant molar ratios (W0) and surfactant concentrations. By modelling SANS profiles with cylindrical and ellipsoidal form factors, the FC6-HCn/W/CO2 microemulsions were found to increase in size with increasing W0 and surfactant concentration. Ellipsoidal cross-sectional radii of the FC6-HC4/W/CO2 microemulsion droplets increased linearly with W0, and finally reached ∼39 Å and ∼78 Å at W0 = 85 (close to the upper limit of solubilizing power). These systems appear to be the largest W/CO2 microemulsion droplets ever reported. The aqueous domains of FC6-HC6 rod-like reversed micelles increased in size by 3.5 times on increasing surfactant concentration from 35 mM to 50 mM: at 35 mM, FC6-HC5 formed rod-like reversed micelles 5.3 times larger than FC6-HC6. Interestingly, these results suggest that hybrid HC-chains partition into the microemulsion aqueous cores with the sulfonate headgroups, or at the W/CO2 interfaces, and so play important roles for tuning the W/CO2 interfacial curvature. The super-efficient W/CO2-type solubilizer FC6-HC4, and the rod-like reversed micelle forming surfactant FC6-HC5, represent the most successful cases of low fluorine content additives. These surfactants facilitate VOC-free, effective and energy-saving CO2 solvent systems for applications such as extraction, dyeing, dry cleaning, metal-plating, enhanced oil recovery and organic/inorganic or nanomaterial synthesis.
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Affiliation(s)
- Masanobu Sagisaka
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan.
| | - Shinji Ono
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Craig James
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Atsushi Yoshizawa
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Azmi Mohamed
- Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia; Nanotechnology Research Centre, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia
| | | | - Robert M Enick
- Department of Chemical and Petroleum Engineering, University of Pittsburgh, 940 Benedum Hall, 3700 O'Hara Street, Pittsburgh, PA 15261, United States
| | - Sarah E Rogers
- ISIS-CCLRC, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX, UK
| | - Adam Czajka
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK
| | - Christopher Hill
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK
| | - Julian Eastoe
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
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Yildiz-Ozturk E, Ilhan-Ayisigi E, Togtema A, Gouveia J, Yesil-Celiktas O. Effects of hydrostatic pressure and supercritical carbon dioxide on the viability of Botryococcus braunii algae cells. Bioresour Technol 2018; 256:328-332. [PMID: 29459319 DOI: 10.1016/j.biortech.2018.02.041] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 02/07/2018] [Accepted: 02/08/2018] [Indexed: 06/08/2023]
Abstract
In bio-based industries, Botryococcus braunii is identified as a potential resource for production of hydrocarbons having a wide range of applications in chemical and biopolymer industries. For a sustainable production platform, the algae cultivation should be integrated with downstream processes. Ideally the algae are not harvested, but the product is isolated while cultivation and growth is continued especially if the doubling time is slow. Consequently, hydrocarbons can be extracted while keeping the algae viable. In this study, the effects of pressure on the viability of B. braunii cells were tested hydrostatically and under supercritical CO2 conditions. Viability was determined by light microscopy, methylene blue uptake and by re-cultivation of the algae after treatments to follow the growth. It was concluded that supercritical CO2 was lethal to the algae, whereas hydrostatic pressure treatments up to 150 bar have not affected cell viability and recultivation was successful.
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Affiliation(s)
- Ece Yildiz-Ozturk
- Department of Bioengineering, Faculty of Engineering, Ege University, 35100 Bornova, Izmir, Turkey
| | - Esra Ilhan-Ayisigi
- Department of Bioengineering, Faculty of Engineering, Ege University, 35100 Bornova, Izmir, Turkey
| | - Arnoud Togtema
- Wageningen University & Research, Food & Biobased Research, Wageningen, The Netherlands
| | - Joao Gouveia
- Wageningen University & Research, Food & Biobased Research, Wageningen, The Netherlands
| | - Ozlem Yesil-Celiktas
- Department of Bioengineering, Faculty of Engineering, Ege University, 35100 Bornova, Izmir, Turkey.
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34
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Kim YH, Lee HM, Choi SW, Cheong IW. A study on amphiphilic fluorinated block copolymer in graphite exfoliation using supercritical CO 2 for stable graphene dispersion. J Colloid Interface Sci 2018; 510:162-71. [PMID: 28942166 DOI: 10.1016/j.jcis.2017.09.065] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Revised: 09/11/2017] [Accepted: 09/15/2017] [Indexed: 11/24/2022]
Abstract
In this study, poly(2,2,2-trifluoroethyl methacrylate)-block-poly(4-vinylpyridine) (PTFEMA-b-PVP) was synthesized by stepwise reversible addition-fragmentation chain transfer (RAFT) polymerization for the preparation of graphene by the exfoliation of graphite nanoplatelets (GPs) in supercritical CO2 (SCCO2). Two different block copolymers (low and high molecular weights) were prepared with the same block ratio and used at different concentrations in the SCCO2 process. The amount of PTFEMA-b-PVP adsorbed on the GPs and the electrical conductivity of the SCCO2-treated GP samples were evaluated using thermogravimetric analysis (TGA) and four-point probe method, respectively. All GP samples treated with SCCO2 were then dispersed in methanol and the dispersion stability was investigated using online turbidity measurements. The concentration and morphology of few-layer graphene stabilized with PTFEMA-b-PVP in the supernatant solution were investigated by gravimetry, scanning electron microscopy, and Raman spectroscopy. Destabilization study of the graphene dispersions revealed that the longer block copolymer exhibited better affinity for graphene, resulting in a higher yield of stable graphene with minimal defects.
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Gao H, Hu G, Liu K, Wu L. Preparation of waterborne dispersions of epoxy resin by ultrasonic-assisted supercritical CO 2 nanoemulsification technique. Ultrason Sonochem 2017; 39:520-527. [PMID: 28732976 DOI: 10.1016/j.ultsonch.2017.05.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 05/20/2017] [Accepted: 05/21/2017] [Indexed: 05/21/2023]
Abstract
Waterborne nanoemulsion of diglycidyl ether of bisphenol A type epoxy resin (DGEBA) with droplet size of around 124nm was prepared by using an ultrasonic-assisted supercritical carbon dioxide (scCO2) technique in an autoclave reactor at a low temperature (32°C). A view cell positioned in-line with the ultrasonic probe allowed observation of the emulsification process. From the image analysis and droplet size measurement, the influence mechanisms of the ultrasonic power, the degree of mixing of scCO2 with DGEBA, the adding amount of emulsifier, and the system pressure on emulsification process and emulsion droplet size were investigated. In the emulsification process, scCO2 penetrated into the mixture and absorbed on the DGEBA molecular. The interactions between CO2 and the functional groups of DGEBA reduced the chain-chain interactions of polymer segments and therefore efficiently reduced the viscosity of DGEBA at a low temperature. Meantime, the cavitation and acoustic streaming of ultrasound provided a shear force for the nanoemulsification and a disturbance force for the homogeneity of the emulsion. Therefore, the combination of scCO2 and ultrasonication made it possible to prepare a long-term stable nanoemulsion under a low temperature. This ultrasonic-assisted scCO2 emulsification method provides an efficient and solvent-free process for the preparation of waterborne nanoemulsions of, for example, some heat-sensitive and water-insoluble active substances at low temperature.
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Affiliation(s)
- Hanyang Gao
- School of Mechanical Engineering, Hangzhou Dianzi University, Xiasha Higher Education Zone, 310018 Hangzhou, Zhejiang Province, China
| | - Guoxin Hu
- School of Mechanical and Power Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240 Shanghai, China.
| | - Kun Liu
- School of Mechanical and Power Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240 Shanghai, China
| | - Liqun Wu
- School of Mechanical Engineering, Hangzhou Dianzi University, Xiasha Higher Education Zone, 310018 Hangzhou, Zhejiang Province, China
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Bai Y, Bai L, Zhou J, Chen H, Zhang L. Sequential delivery of VEGF, FGF-2 and PDGF from the polymeric system enhance HUVECs angiogenesis in vitro and CAM angiogenesis. Cell Immunol 2017; 323:19-32. [PMID: 29111157 DOI: 10.1016/j.cellimm.2017.10.008] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2017] [Revised: 10/17/2017] [Accepted: 10/21/2017] [Indexed: 12/17/2022]
Abstract
Angiogenesis is an organized series of events, beginning with vessel destabilization, followed by endothelial cell re-organization, and ending with vessel maturation. The formation of a mature vascular network requires precise spatial and temporal regulation of a large number of angiogenic factors, including vascular endothelial growth factor (VEGF), basic fibroblast growth factor-2 (FGF-2) and platelet-derived growth factor (PDGF). VEGF aids in vascular permeability and endothelial cell recruitment, FGF-2 activates endothelial cell proliferation and migration while PDGF stimulates vascular stability. Accordingly, VEGF may inhibit vessel stabilization while PDGF may inhibit endothelial cell recruitment. Therefore, a new polymeric system was prepared by the supercritical carbon dioxide foaming technology, which realized sequential delivery of two or more growth factors with the controlled dose and rate. Increased release of VEGF (71.10%) and FGF-2 (69.76%) compared to PDGF (43.17%) was observed for the first 7 days. Thereafter, up till 21 days, an increased rate of release of BMP-2 compared to VEGF 165 was observed. The effects of PDGF-PLAms/VEGF-FGF-2-PLGA scaffolds on angiogenesis were investigated by human umbilical vein endothelial cells (HUVECs) angiogenic differentiation in vitro and chorioallantoic membrane (CAM) angiogenesis in vivo. Sequential delivery of VEGF, FGF-2 and PDGF from structural polymer scaffolds with distinct kinetics resulted in significant angiogenic differentiation of HUVECs and rapid formation of mature vascular networks in chorioallantoic membrane. This study reported a composite scaffold with distinct release kinetics, and these results clearly indicated the importance of sequential delivery of multiple growth factors in tissue regeneration and engineering.
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Affiliation(s)
- Yan Bai
- Chongqing Research Center for Pharmaceutical Engineering, School of Pharmacy, Chongqing Medical University, Chongqing 400016, PR China; Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen 361021, PR China.
| | - Lijuan Bai
- Chongqing Research Center for Pharmaceutical Engineering, School of Pharmacy, Chongqing Medical University, Chongqing 400016, PR China
| | - Jing Zhou
- Chongqing Research Center for Pharmaceutical Engineering, School of Pharmacy, Chongqing Medical University, Chongqing 400016, PR China
| | - Huali Chen
- Chongqing Research Center for Pharmaceutical Engineering, School of Pharmacy, Chongqing Medical University, Chongqing 400016, PR China
| | - Liangke Zhang
- Chongqing Research Center for Pharmaceutical Engineering, School of Pharmacy, Chongqing Medical University, Chongqing 400016, PR China.
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37
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Diba M, Pape B, Klymov A, Zhang Y, Song J, Löwik DWPM, Seyednejad H, Leeuwenburgh SCG. Nanostructured raspberry-like gelatin microspheres for local delivery of multiple biomolecules. Acta Biomater 2017; 58:67-79. [PMID: 28579541 DOI: 10.1016/j.actbio.2017.05.059] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 05/15/2017] [Accepted: 05/31/2017] [Indexed: 11/30/2022]
Abstract
Multicompartment particles, which are particles composed of smaller building units, have gained considerable interest during the past decade to facilitate simultaneous and differential delivery of several biomolecules in various applications. Supercritical carbon dioxide (CO2) processing is an industrial technology widely used for large-scale synthesis and processing of materials. However, the application of this technology for production of multicompartment particles from colloidal particles has not yet been explored. Here, we report the formation of raspberry-like gelatin (RLG) microparticles composed of gelatin nanoparticles as colloidal building blocks through supercritical CO2 processing. We show that these RLG microparticles exhibit a high stability upon dispersion in aqueous media without requiring chemical cross-linking. We further demonstrate that these microparticles are cytocompatible and facilitate differential release of two different model compounds. The strategy presented here can be utilized as a cost-effective route for production of various types of multicompartment particles using colloidal particles with suitable interparticle interactions. STATEMENT OF SIGNIFICANCE Multicompartment particles have gained considerable interest during the past decade to facilitate simultaneous and differential delivery of multiple biomolecules in various biomedical applications. Nevertheless, common methods employed for the production of such particles are often complex and only offer small-scale production. Here, we report the formation of raspberry-like gelatin (RLG) microparticles composed of gelatin nanoparticles as colloidal building blocks through supercritical CO2 processing. We show that these microparticles are cytocompatible and facilitate differential release of two model compounds with different molecular sizes, promising successful applications in various biomedical areas. Summarizing, this paper presents a novel strategy that can be utilized as a cost-effective route for production of various types of multicompartment particles using a wide range of colloidal building blocks.
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Affiliation(s)
- Mani Diba
- Department of Biomaterials, Radboud University Medical Center, Philips van Leydenlaan 25, 6525 EX Nijmegen, The Netherlands
| | - Bram Pape
- FeyeCon Development and Implementation B.V., Rijnkade 17A, 1382 GS Weesp, The Netherlands
| | - Alexey Klymov
- Department of Biomaterials, Radboud University Medical Center, Philips van Leydenlaan 25, 6525 EX Nijmegen, The Netherlands
| | - Yang Zhang
- Department of Biomaterials, Radboud University Medical Center, Philips van Leydenlaan 25, 6525 EX Nijmegen, The Netherlands
| | - Jiankang Song
- Department of Biomaterials, Radboud University Medical Center, Philips van Leydenlaan 25, 6525 EX Nijmegen, The Netherlands
| | - Dennis W P M Löwik
- Department of Bio-organic Chemistry, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Hajar Seyednejad
- FeyeCon Development and Implementation B.V., Rijnkade 17A, 1382 GS Weesp, The Netherlands
| | - Sander C G Leeuwenburgh
- Department of Biomaterials, Radboud University Medical Center, Philips van Leydenlaan 25, 6525 EX Nijmegen, The Netherlands.
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Gao H, Xue C, Hu G, Zhu K. Production of graphene quantum dots by ultrasound-assisted exfoliation in supercritical CO 2/H 2O medium. Ultrason Sonochem 2017; 37:120-127. [PMID: 28427614 DOI: 10.1016/j.ultsonch.2017.01.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2016] [Revised: 01/03/2017] [Accepted: 01/03/2017] [Indexed: 05/13/2023]
Abstract
In this research, three kinds of graphene quantum dots (GQDs)-pristine graphene quantum dots (PGQDs), expanded graphene quantum dots (EGQDs) and graphene oxide quantum dots (GOQDs)-were produced from natural graphite, expanded graphite, and oxide graphite respectively in an ultrasound-assisted supercritical CO2 (scCO2)/H2O system. The effects of aqueous solution content ratio, system pressure, and ultrasonic power on the yields of different kinds of GQDs were investigated. According to these experiment results, the combination of the intense knocking force generated from high-pressure acoustic cavitation in a scCO2/H2O system and the superior penetration ability of scCO2 was considered to be the key to the successful exfoliation of such tiny pieces from bulk graphite. An interesting result was found that, contrary to common experience, the yield of PGQDs from natural graphite was much higher than that of GOQDs from graphite oxide. Based on the experimental analysis, the larger interlayer resistance of natural graphite, which hindered the insertion of scCO2 molecules, and the hydrophobic property of natural graphite surface, which made the planar more susceptible to the attack of ultrasonic collapsing bubbles, were deduced to be the two main reasons for this result. The differences in characteristics among the three kinds of GQDs were also studied and compared in this research. In our opinion, this low-cost and time-saving method may provide an alternative green route for the production of various kinds of GQDs, especially PGQDs.
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Affiliation(s)
- Hanyang Gao
- School of Mechanical Engineering, Hangzhou Dianzi University, Xiasha Higher Education Zone, 310018 Hangzhou, Zhejiang Province, China
| | - Chen Xue
- School of Mechanical and Power Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240 Shanghai, China
| | - Guoxin Hu
- School of Mechanical and Power Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240 Shanghai, China.
| | - Kunxu Zhu
- School of Mechanical and Power Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240 Shanghai, China
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39
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Szafraniec J, Antosik A, Knapik-Kowalczuk J, Kurek M, Syrek K, Chmiel K, Paluch M, Jachowicz R. Planetary ball milling and supercritical fluid technology as a way to enhance dissolution of bicalutamide. Int J Pharm 2017; 533:470-479. [PMID: 28363855 DOI: 10.1016/j.ijpharm.2017.03.078] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Revised: 03/23/2017] [Accepted: 03/28/2017] [Indexed: 12/17/2022]
Abstract
Dissolution of bicalutamide processed with polyvinylpyrrolidone by either supercritical carbon dioxide or ball milling has been investigated. Various compositions as well as process parameters were used to obtain binary systems of the drug with the carrier. Thermal analysis and powder X-ray diffractometry confirmed amorphization of bicalutamide mechanically activated by ball milling and the decrease in crystallinity of the supercritical carbon dioxide-treated drug. Both methods led to reduction of particles size what was confirmed by scanning electron microscopy and laser diffraction measurements. Moreover, the effect of micronisation was found to depend on the parameters of applied process. Fourier transform infrared spectroscopy revealed the appearance of intermolecular interactions between drug and carrier molecules that play an important role in the stabilization of amorphous form of the active compound. Changes in crystal structure combined with reduced size of particles of bicalutamide dispersed within polymer matrix were found to improve dissolution of bicalutamide by 4 to 10-fold in comparison to untreated drug. It is of particular importance as poor dissolution profiles are considered to be the major limitation in bioavailability of the drug.
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Affiliation(s)
- Joanna Szafraniec
- Department of Pharmaceutical Technology and Biopharmaceutics, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland; Department of Physical Chemistry and Electrochemistry, Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland.
| | - Agata Antosik
- Department of Pharmaceutical Technology and Biopharmaceutics, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland
| | - Justyna Knapik-Kowalczuk
- Division of Biophysics and Molecular Physics, Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland; Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - Mateusz Kurek
- Department of Pharmaceutical Technology and Biopharmaceutics, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland
| | - Karolina Syrek
- Department of Physical Chemistry and Electrochemistry, Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland
| | - Krzysztof Chmiel
- Division of Biophysics and Molecular Physics, Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland; Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - Marian Paluch
- Division of Biophysics and Molecular Physics, Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland; Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - Renata Jachowicz
- Department of Pharmaceutical Technology and Biopharmaceutics, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland
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Toscan A, Morais ARC, Paixão SM, Alves L, Andreaus J, Camassola M, Dillon AJP, Lukasik RM. High-pressure carbon dioxide/water pre-treatment of sugarcane bagasse and elephant grass: Assessment of the effect of biomass composition on process efficiency. Bioresour Technol 2017; 224:639-647. [PMID: 27955864 DOI: 10.1016/j.biortech.2016.11.101] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 11/23/2016] [Accepted: 11/24/2016] [Indexed: 05/03/2023]
Abstract
The performance of two lignocellulosic biomasses was studied in high-pressure carbon dioxide/water pre-treatment. Sugarcane bagasse and elephant grass were used to produce C5-sugars from hemicellulose and, simultaneously, to promote cellulose digestibility for enzymatic saccharification. Different pre-treatment conditions, with combined severity factor ranging from -1.17 to -0.04, were evaluated and maximal total xylan to xylose yields of 59.2wt.% (34.4wt.% xylooligomers) and 46.4wt.% (34.9wt.% xylooligomers) were attained for sugarcane bagasse and elephant grass, respectively. Furthermore, pre-treated biomasses were highly digestible, with glucan to glucose yields of 77.2mol% and 72.4mol% for sugarcane bagasse and elephant grass, respectively. High-pressure carbon dioxide/water pre-treatment provides high total C5-sugars and glucose recovery from both lignocellulosic biomasses; however it is highly influenced by composition and intrinsic features of each biomass. The obtained results confirm this approach as an effective and greener alternative to conventional pre-treatment processes.
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Affiliation(s)
- Andréia Toscan
- Unidade de Bioenergia, Laboratório Nacional de Energia e Geologia, I.P., Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal; Universidade de Caxias do Sul - Instituto de Biotecnologia, Laboratório de Enzimas e Biomassa, 95070-560 Caxias do Sul, RS, Brazil
| | - Ana Rita C Morais
- Unidade de Bioenergia, Laboratório Nacional de Energia e Geologia, I.P., Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal; LAQV/REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Susana M Paixão
- Unidade de Bioenergia, Laboratório Nacional de Energia e Geologia, I.P., Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal
| | - Luís Alves
- Unidade de Bioenergia, Laboratório Nacional de Energia e Geologia, I.P., Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal
| | - Jürgen Andreaus
- Departamento de Química, Universidade Regional de Blumenau, 89030-903 Blumenau, SC, Brazil
| | - Marli Camassola
- Universidade de Caxias do Sul - Instituto de Biotecnologia, Laboratório de Enzimas e Biomassa, 95070-560 Caxias do Sul, RS, Brazil
| | - Aldo José Pinheiro Dillon
- Universidade de Caxias do Sul - Instituto de Biotecnologia, Laboratório de Enzimas e Biomassa, 95070-560 Caxias do Sul, RS, Brazil
| | - Rafal M Lukasik
- Unidade de Bioenergia, Laboratório Nacional de Energia e Geologia, I.P., Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal.
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Jia J, Gai Y, Wang W, Zhao Y. Green synthesis of biocompatiable chitosan-graphene oxide hybrid nanosheet by ultrasonication method. Ultrason Sonochem 2016; 32:300-306. [PMID: 27150774 DOI: 10.1016/j.ultsonch.2016.03.027] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2016] [Revised: 03/27/2016] [Accepted: 03/28/2016] [Indexed: 05/21/2023]
Abstract
Ultrasound-induced synthesis of chitosan-modified nano-scale graphene oxide (CS-NGO) hybrid nanosheets, which has great potential pharmaceutical applications, in supercritical CO2 without catalyst was presented for the first time. The preparation process does not require organic solvent and post-processing, and CO2 easily escapes from the product. The morphology and structure of the CS-NGO, characterized using scanning electron microscopy, transmission electron microscopy, infrared spectroscopy, X-ray photoelectron spectroscopy and thermogravimetric analysis, confirms that it was combined via the amide linkage, and had excellent dispersibility and stability toward acidic and physiological aqueous solution, which implies that it could be used as a drug-carrier. The sonication power played a crucial role in inducing forming amidation, and the conversion rate increased with the sonication time. The mechanism of this reaction was explained.
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Affiliation(s)
- Jingfu Jia
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Yanzhe Gai
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Wucong Wang
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Yaping Zhao
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China.
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42
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Xie M, Fan D, Zhao Z, Li Z, Li G, Chen Y, He X, Chen A, Li J, Lin X, Zhi M, Li Y, Lan P. Nano-curcumin prepared via supercritical: Improved anti-bacterial, anti-oxidant and anti-cancer efficacy. Int J Pharm 2015; 496:732-40. [PMID: 26570985 DOI: 10.1016/j.ijpharm.2015.11.016] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Revised: 10/19/2015] [Accepted: 11/09/2015] [Indexed: 11/18/2022]
Abstract
Curcumin (CM) possesses multiple biological activities. However, poor water solubility and low bioavailability limit its application in biomedical fields. CM nanoparticles (NPs) (230-240nm) were prepared by solution-enhanced dispersion via supercritical CO2 (SEDS) (22-22.5MPa pressure, 31-32.5°C temperature) and its biological functions were evaluated in this study. The Minimum inhibitory concentration of CM NPs against S. aureus (∼250μg/mL) was lower than CM-DMSO (∼500μg/mL). Meanwhile, CM NPs showed effective anti-oxidant ability at a concentration raging from 125 to 2000μg/mL. CM NPs showed time-dependent intracellular internalization ability, resulting in an enhanced anti-cancer effect on colorectal cancer cells (HCT116), and the mechanism could be explained by cell cycle arrest in G2/M phase associated with inducing apoptotic cells. Moreover, CM NPs exhibited reduced cytotoxicity on normal cells (NCM460) compared to CM-DMSO and 5-Fu. In conclusion, CM NPs prepared via SEDS showed potentials in biomedical applications.
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Affiliation(s)
- Maobin Xie
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China; School of Materials, The University of Manchester, Manchester M13 9PL, UK
| | - Dejun Fan
- Department of Colorectal Surgery, The Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510655, China
| | - Zheng Zhao
- State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 43000, China
| | - Zhi Li
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China
| | - Gang Li
- National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China
| | - Yufeng Chen
- Department of Colorectal Surgery, The Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510655, China
| | - Xiaowen He
- Department of Colorectal Surgery, The Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510655, China
| | - Aizheng Chen
- College of Chemical Engineering, Huaqiao University, Xiamen 361021, China
| | - Jiashen Li
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China; School of Materials, The University of Manchester, Manchester M13 9PL, UK
| | - Xiaofen Lin
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China; School of Materials, The University of Manchester, Manchester M13 9PL, UK
| | - Min Zhi
- Department of Colorectal Surgery, The Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510655, China
| | - Yi Li
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China; School of Materials, The University of Manchester, Manchester M13 9PL, UK.
| | - Ping Lan
- Department of Colorectal Surgery, The Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510655, China.
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43
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Calgaro CO, Schlemmer DF, da Silva MDCR, Maziero EV, Tanabe EH, Bertuol DA. Fast copper extraction from printed circuit boards using supercritical carbon dioxide. Waste Manag 2015; 45:289-297. [PMID: 26022338 DOI: 10.1016/j.wasman.2015.05.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 05/12/2015] [Accepted: 05/12/2015] [Indexed: 06/04/2023]
Abstract
Technological development and intensive marketing support the growth in demand for electrical and electronic equipment (EEE), for which printed circuit boards (PCBs) are vital components. As these devices become obsolete after short periods, waste PCBs present a problem and require recycling. PCBs are composed of ceramics, polymers, and metals, particularly Cu, which is present in highest percentages. The aim of this study was to develop an innovative method to recover Cu from the PCBs of old mobile phones, obtaining faster reaction kinetics by means of leaching with supercritical CO2 and co-solvents. The PCBs from waste mobile phones were characterized, and evaluation was made of the reaction kinetics during leaching at atmospheric pressure and using supercritical CO2 with H2O2 and H2SO4 as co-solvents. The results showed that the PCBs contained 34.83 wt% of Cu. It was found that the supercritical extraction was 9 times faster, compared to atmospheric pressure extraction. After 20 min of supercritical leaching, approximately 90% of the Cu contained in the PCB was extracted using a 1:20 solid:liquid ratio and 20% of H2O2 and H2SO4 (2.5 M). These results demonstrate the efficiency of the process. Therefore the supercritical CO2 employment in the PCBs recycling is a promising alternative and the CO2 is environmentally acceptable and reusable.
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Affiliation(s)
- C O Calgaro
- Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria - UFSM, Avenida Roraima 1000, 97105-900 Santa Maria, RS, Brazil.
| | - D F Schlemmer
- Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria - UFSM, Avenida Roraima 1000, 97105-900 Santa Maria, RS, Brazil.
| | - M D C R da Silva
- Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria - UFSM, Avenida Roraima 1000, 97105-900 Santa Maria, RS, Brazil.
| | - E V Maziero
- Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria - UFSM, Avenida Roraima 1000, 97105-900 Santa Maria, RS, Brazil.
| | - E H Tanabe
- Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria - UFSM, Avenida Roraima 1000, 97105-900 Santa Maria, RS, Brazil.
| | - D A Bertuol
- Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria - UFSM, Avenida Roraima 1000, 97105-900 Santa Maria, RS, Brazil.
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Dotto GL, Cunha JM, Calgaro CO, Tanabe EH, Bertuol DA. Surface modification of chitin using ultrasound-assisted and supercritical CO2 technologies for cobalt adsorption. J Hazard Mater 2015; 295:29-36. [PMID: 25880046 DOI: 10.1016/j.jhazmat.2015.04.009] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 04/02/2015] [Accepted: 04/04/2015] [Indexed: 05/22/2023]
Abstract
Ultrasound-assisted (UA) and supercritical CO2 technologies (SCO2) were used to modify the chitin surface and, improve its adsorption characteristics regarding to cobalt. Chitin, before and after the treatments, was characterized by N2 adsorption isotherms (BET), infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Unmodified and surface modified chitins were used as adsorbents to remove cobalt from aqueous solutions. The adsorption study was performed by equilibrium isotherms and kinetic curves. The chitin particle characteristics, such as, surface area, pore volume and porosity were improved by the UA and SCO2 treatments. The crystallinity index decreased after the UA and SCO2 treatments, and also, intense surface modifications were observed. Langmuir and Freundlich models were adequate to represent the adsorption equilibrium. The maximum adsorption capacities were 50.03, 83.94 and 63.08 mg g(-1) for unmodified chitin, UA surface modified chitin and SCO2 surface modified chitin. The adsorption kinetic curves were well represented by the pseudo-second order model. UA and SCO2 technologies are alternatives to modify the chitin surface and improve its adsorption characteristics.
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Affiliation(s)
- Guilherme L Dotto
- Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria - UFSM, 1000 Roraima Avenue, 97105-900, Santa Maria, RS, Brazil.
| | - Jeanine M Cunha
- Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria - UFSM, 1000 Roraima Avenue, 97105-900, Santa Maria, RS, Brazil.
| | - Camila O Calgaro
- Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria - UFSM, 1000 Roraima Avenue, 97105-900, Santa Maria, RS, Brazil.
| | - Eduardo H Tanabe
- Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria - UFSM, 1000 Roraima Avenue, 97105-900, Santa Maria, RS, Brazil.
| | - Daniel A Bertuol
- Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria - UFSM, 1000 Roraima Avenue, 97105-900, Santa Maria, RS, Brazil.
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Ben Rahal N, Barba FJ, Barth D, Chevalot I. Supercritical CO₂ extraction of oil, fatty acids and flavonolignans from milk thistle seeds: Evaluation of their antioxidant and cytotoxic activities in Caco-2 cells. Food Chem Toxicol 2015; 83:275-82. [PMID: 26172510 DOI: 10.1016/j.fct.2015.07.006] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Revised: 06/22/2015] [Accepted: 07/08/2015] [Indexed: 12/26/2022]
Abstract
The optimal conditions of supercritical carbon dioxide (SC-CO2) (160-220 bars, 40-80 °C) technology combined with co-solvent (ethanol), to recover oil, flavonolignans (silychristin, silydianin and silybinin) and fatty acids from milk thistle seeds, to be used as food additives and/or nutraceuticals, were studied. Moreover, the antioxidant and cytotoxic activities of the SC-CO2 oil seeds extracts were evaluated in Caco-2 carcinoma cells. Pressure and temperature had a significant effect on oil and flavonolignans recovery, although there was not observed a clear trend. SC-CO2 with co-solvent extraction at 220 bars, 40 °C was the optimum treatment to recover oil (30.8%) and flavonolignans from milk thistle seeds. Moreover, linoleic (47.64-66.70%), and oleic (19.68-24.83%) acids were the predominant fatty acids in the oil extracts recovered from milk thistle under SC-CO2. In addition, SC-CO2 extract showed a high antioxidant activity determined by DPPH and ABTS tests. Cytotoxic activities of silychristin, silydianin and silybinin and the obtained SC-CO2 extract (220 bars, 40 °C) were evaluated against Caco-2 cells. The SC-CO2 extract inhibited the proliferation of Caco-2 cells in a dose-responsive manner and induced the highest percentage of mortality of Caco-2 cells (from 43 to 71% for concentrations from 10 up to 100 μg/ml of SC-CO2 oil seeds).
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Affiliation(s)
- Naila Ben Rahal
- Laboratoire Réactions et Génie des Procédés UMR CNRS 7274, Université de Lorraine, 1, rue Grandville BP20451, 54001 Nancy, France.
| | - Francisco J Barba
- Nutrition and Food Science Area, Faculty of Pharmacy, Universitat de València, Avda. Vicent Andrés Estellés, s/n., 46100 Burjassot, Spain
| | - Danielle Barth
- Laboratoire Réactions et Génie des Procédés UMR CNRS 7274, Université de Lorraine, 1, rue Grandville BP20451, 54001 Nancy, France
| | - Isabelle Chevalot
- Laboratoire Réactions et Génie des Procédés UMR CNRS 7274, Université de Lorraine, 1, rue Grandville BP20451, 54001 Nancy, France
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