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Wang Y, Chai P, Yao F, Chen H, Shi Z, Zhao H, Li W, Liu H. Linear instability analysis of a shear thinning gelled jet with yield stress in coaxial atomization. SOFT MATTER 2023. [PMID: 37469310 DOI: 10.1039/d3sm00583f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/21/2023]
Abstract
This study aims to experimentally and theoretically investigate the roles of a threaded nozzle and yield stress in the coaxial air blast atomization of a gelled jet by means of rheological tests and high-speed flow visualization techniques. Similar to the breakup types of Newtonian fluids, a gelled jet will gradually exhibit an oscillation mode, membrane-type breakup, fiber-type breakup and a superpulsating submode as the airflow velocity increases. The transition conditions for each type are determined and plotted in the dimensionless map of We-Oh. For the jet spray angle, the maximum occurs when We = 600 and is clearly enlarged by the gas-side thread in the nozzle. The numerical results of the linear stability analysis indicate that a smaller dominant unstable growth rate is acquired by swelling the yield stress, while the higher dominant unstable growth rate and truncated wavenumber appear as the rotational airflow is acquired through the gas-side threaded nozzle.
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Affiliation(s)
- Yufan Wang
- National Energy Coal Gasification Technology Research and Development Center, Shanghai Engineering Research Center of Coal Gasification, Engineering Research Center of Resource Utilization of Carbon-containing Waste with Carbon Neutrality, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China.
| | - Pingping Chai
- Department of Mathematics, East China University of Science and Technology, Shanghai 200237, China
| | - Feng Yao
- Shanghai Institute of Space Propulsion, Shanghai 201112, China
| | - Hongyu Chen
- Shanghai Institute of Space Propulsion, Shanghai 201112, China
| | - Zhehang Shi
- Shanghai Institute of Space Propulsion, Shanghai 201112, China
| | - Hui Zhao
- National Energy Coal Gasification Technology Research and Development Center, Shanghai Engineering Research Center of Coal Gasification, Engineering Research Center of Resource Utilization of Carbon-containing Waste with Carbon Neutrality, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China.
| | - Weifeng Li
- National Energy Coal Gasification Technology Research and Development Center, Shanghai Engineering Research Center of Coal Gasification, Engineering Research Center of Resource Utilization of Carbon-containing Waste with Carbon Neutrality, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China.
| | - Haifeng Liu
- National Energy Coal Gasification Technology Research and Development Center, Shanghai Engineering Research Center of Coal Gasification, Engineering Research Center of Resource Utilization of Carbon-containing Waste with Carbon Neutrality, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China.
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2
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Diaz-Gomez L, Gonzalez-Prada I, Millan R, Da Silva-Candal A, Bugallo-Casal A, Campos F, Concheiro A, Alvarez-Lorenzo C. 3D printed carboxymethyl cellulose scaffolds for autologous growth factors delivery in wound healing. Carbohydr Polym 2022; 278:118924. [PMID: 34973742 DOI: 10.1016/j.carbpol.2021.118924] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 10/02/2021] [Accepted: 11/17/2021] [Indexed: 11/02/2022]
Abstract
This work aims to use carboxymethyl cellulose (CMC) as main structural and functional component of 3D printed scaffolds for healing of diabetic wounds. Differently from previous inks involving small contents in CMC, herein sterile (steam-heated) concentrated CMC solely dispersions (10-20%w/v) were screened regarding printability and fidelity properties. CMC (15%w/v)-citric acid inks showed excellent self-healing rheological properties and stability during storage. CMC scaffolds loaded with platelet rich plasma (PRP) sustained the release of relevant growth factors. CMC scaffolds both with and without PRP promoted angiogenesis in ovo, stem cell migration in vitro, and wound healing in a diabetic model in vivo. Transparent CMC scaffolds allowed direct monitoring of bilateral full-thickness wounds created in rat dorsum. CMC scaffolds facilitated re-epithelialization, granulation, and angiogenesis in full-thickness skin defects, and the performance was improved when combined with PRP. Overall, CMC is pointed out as outstanding component of active dressings for diabetic wounds.
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Affiliation(s)
- Luis Diaz-Gomez
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, I+D Farma (GI-1645), Facultad de Farmacia and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
| | - Iago Gonzalez-Prada
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, I+D Farma (GI-1645), Facultad de Farmacia and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Rosendo Millan
- Centro de Biomedicina Experimental da USC (CEBEGA), Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - Andres Da Silva-Candal
- Clinical Neurosciences Research Laboratory, Health Research Institute of Santiago de Compostela (IDIS), Clinical University Hospital, Universidade de Santiago de Compostela, Santiago de Compostela, Spain; Neurovascular Diseases Laboratory, Neurology Service, University Hospital Complex of A Coruña, Biomedical Research Institute (INIBIC), 15706 A Coruña, Spain
| | - Ana Bugallo-Casal
- Clinical Neurosciences Research Laboratory, Health Research Institute of Santiago de Compostela (IDIS), Clinical University Hospital, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Francisco Campos
- Clinical Neurosciences Research Laboratory, Health Research Institute of Santiago de Compostela (IDIS), Clinical University Hospital, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Angel Concheiro
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, I+D Farma (GI-1645), Facultad de Farmacia and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Carmen Alvarez-Lorenzo
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, I+D Farma (GI-1645), Facultad de Farmacia and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
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Hybrid Collagen Hydrogel/Chondroitin-4-Sulphate Fortified with Dermal Fibroblast Conditioned Medium for Skin Therapeutic Application. Polymers (Basel) 2021; 13:polym13040508. [PMID: 33567703 PMCID: PMC7914873 DOI: 10.3390/polym13040508] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 02/03/2021] [Accepted: 02/04/2021] [Indexed: 12/30/2022] Open
Abstract
The current strategy for rapid wound healing treatment involves combining a biomaterial and cell-secreted proteins or biomolecules. This study was aimed at characterizing 3-dimensional (3D) collagen hydrogels fortified with dermal fibroblast-conditioned medium (DFCM) as a readily available acellular skin substitute. Confluent fibroblasts were cultured with serum-free keratinocyte-specific medium (KM1 and KM2) and fibroblast-specific medium (FM) to obtain DFCM. Subsequently, the DFCM was mixed with collagen (Col) hydrogel and chondroitin-4-sulphate (C4S) to fabricate 3D constructs termed Col/C4S/DFCM-KM1, Col/C4S/DFCM-KM2, and Col/C4S/DFCM-FM. The constructs successfully formed soft, semi-solid and translucent hydrogels within 1 h of incubation at 37 °C with strength of <2.5 Newton (N). The Col/C4S/DFCM demonstrated significantly lower turbidity compared to the control groups. The Col/C4S/DFCM also showed a lower percentage of porosity (KM1: 35.15 ± 9.76%; KM2: 6.85 ± 1.60%; FM: 14.14 ± 7.65%) compared to the Col (105.14 ± 11.87%) and Col/C4S (143.44 ± 27.72%) constructs. There were no changes in both swelling and degradation among all constructs. Fourier transform infrared spectrometry showed that all groups consisted of oxygen–hydrogen bonds (O-H) and amide I, II, and III. In conclusion, the Col/C4S/DFCM constructs maintain the characteristics of native collagen and can synergistically deliver essential biomolecules for future use in skin therapeutic applications.
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Romero-Montero A, Aguirre-Díaz IS, Puiggalí J, del Valle LJ, Gimeno M. Self-assembly of supramolecular chemoenzymatic poly- l-phenylalanine. Polym Chem 2021. [DOI: 10.1039/d0py01659d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The self-assembly behavior of chemoenzymatic high molecular weight (ca. 30 000 Da) poly-l-phenylalanine (ePLP) and the nano-morphologies thereof are investigated.
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Affiliation(s)
- Alejandra Romero-Montero
- Depto. de Alimentos y Biotecnología
- Facultad de Química
- Universidad Nacional Autónoma de México
- 04510 CDMX
- Mexico
| | - Isabel S. Aguirre-Díaz
- Depto. de Alimentos y Biotecnología
- Facultad de Química
- Universidad Nacional Autónoma de México
- 04510 CDMX
- Mexico
| | - Jordi Puiggalí
- Chemical Engineering Department
- Escola d'Enginyeria de Barcelona Est-EEBE
- 08019 Barcelona
- Spain
- Institute for Bioengineering of Catalonia (IBEC)
| | - Luis J. del Valle
- Chemical Engineering Department
- Escola d'Enginyeria de Barcelona Est-EEBE
- 08019 Barcelona
- Spain
| | - Miquel Gimeno
- Depto. de Alimentos y Biotecnología
- Facultad de Química
- Universidad Nacional Autónoma de México
- 04510 CDMX
- Mexico
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Oppong F, Li Z, Fakhrabadi EA, Raorane T, Giri PM, Liberatore MW, Sarver JG, Trabbic CJ, Hosier CE, Erhardt PW, Maltese WA, Nesamony J. Investigating the Potential to Deliver and Maintain Plasma and Brain Levels of a Novel Practically Insoluble Methuosis Inducing Anticancer Agent 5-Methoxy MOMIPP Through an Injectable In Situ Forming Thermoresponsive Hydrogel Formulation. J Pharm Sci 2020; 109:2719-2728. [PMID: 32473210 DOI: 10.1016/j.xphs.2020.05.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 04/16/2020] [Accepted: 05/18/2020] [Indexed: 11/26/2022]
Abstract
A new indole based chalcone molecule MOMIPP induced methuosis mediated cell death in gliobastoma and other cancer cell lines. But the drug was insoluble in water and had a very short plasma half-life. The purpose of this work was to develop a formulation that can provide sustained levels of MOMIPP in vivo. Initial studies established drug solubility in various solvents. N-methyl pyrrolidone (NMP) was determined as an excellent solvent for the drug. Subsequently a poloxamer-407 based thermoreversible gel containing NMP was used to develop the formulation. Rheological studies were performed via oscillatory temperature mode, continuous shear analysis, and oscillatory frequency mode experiments. The mechanical properties of the formulations were tested using a texture profile analyzer. The gelation temperature and time of formulations increased with increasing amounts of NMP. However, the viscosity at 20 °C and storage modulus decreased as the amount of NMP increased. Characterization studies helped to identify the gel formulation that was used to administer the drug orally, sub-cutaneously, and intra-peritoneally. When the gel was given intraperitoneally the target plasma and brain levels of over 5 μM was maintained for about 8 h. Thus, a thermoreversible gel formulation that can deliver MOMIPP in animal studies was successfully developed.
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Affiliation(s)
- Frank Oppong
- Division of Industrial Pharmacy, Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, University of Toledo HSC, Toledo, Ohio 43614
| | - Zehui Li
- Department of Cancer Biology, College of Medicine and Life Sciences, University of Toledo HSC, Toledo, Ohio 43614
| | - Ehsan Akbari Fakhrabadi
- Department of Chemical Engineering, College of Engineering, University of Toledo, Toledo, Ohio 43614
| | - Tanvi Raorane
- Division of Industrial Pharmacy, Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, University of Toledo HSC, Toledo, Ohio 43614
| | - Paras M Giri
- Division of Industrial Pharmacy, Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, University of Toledo HSC, Toledo, Ohio 43614
| | - Matthew W Liberatore
- Department of Chemical Engineering, College of Engineering, University of Toledo, Toledo, Ohio 43614
| | - Jeffrey G Sarver
- Department of Medicinal and Biological Chemistry, College of Pharmacy and Pharmaceutical Sciences, University of Toledo HSC, Toledo, Ohio 43614
| | - Christopher J Trabbic
- Department of Medicinal and Biological Chemistry, College of Pharmacy and Pharmaceutical Sciences, University of Toledo HSC, Toledo, Ohio 43614
| | - Corey E Hosier
- Department of Medicinal and Biological Chemistry, College of Pharmacy and Pharmaceutical Sciences, University of Toledo HSC, Toledo, Ohio 43614
| | - Paul W Erhardt
- Department of Medicinal and Biological Chemistry, College of Pharmacy and Pharmaceutical Sciences, University of Toledo HSC, Toledo, Ohio 43614
| | - William A Maltese
- Department of Cancer Biology, College of Medicine and Life Sciences, University of Toledo HSC, Toledo, Ohio 43614
| | - Jerry Nesamony
- Division of Industrial Pharmacy, Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, University of Toledo HSC, Toledo, Ohio 43614.
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Conception and characterization of a multi-sensitive composite chitosan-red marine alga-polysaccharide hydrogels for insulin controlled-release. Carbohydr Polym 2020; 236:116046. [DOI: 10.1016/j.carbpol.2020.116046] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 02/17/2020] [Accepted: 02/19/2020] [Indexed: 01/02/2023]
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Martínez-López A, Carvajal-Millan E, Sotelo-Cruz N, Micard V, Rascón-Chu A, López-Franco Y, Lizardi-Mendoza J, Canett-Romero R. Enzymatically cross-linked arabinoxylan microspheres as oral insulin delivery system. Int J Biol Macromol 2019; 126:952-959. [DOI: 10.1016/j.ijbiomac.2018.12.192] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 12/20/2018] [Accepted: 12/21/2018] [Indexed: 10/27/2022]
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8
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In vitro degradation of covalently cross-linked arabinoxylan hydrogels by bifidobacteria. Carbohydr Polym 2016; 144:76-82. [DOI: 10.1016/j.carbpol.2016.02.031] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Revised: 01/28/2016] [Accepted: 02/10/2016] [Indexed: 11/18/2022]
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Coviello T, Margheritelli S, Matricardi P, Di Meo C, Cerreto F, Alhaique F, Abrami M, Grassi M. Influence of borate amount on the swelling and rheological properties of the Scleroglucan/borax system. J Appl Polym Sci 2016. [DOI: 10.1002/app.42860] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tommasina Coviello
- Dipartimento di Chimica e Tecnologie del Farmaco; Università di Roma “La Sapienza,”; Roma 00185 Italy
| | - Silvia Margheritelli
- Dipartimento di Chimica e Tecnologie del Farmaco; Università di Roma “La Sapienza,”; Roma 00185 Italy
| | - Pietro Matricardi
- Dipartimento di Chimica e Tecnologie del Farmaco; Università di Roma “La Sapienza,”; Roma 00185 Italy
| | - Chiara Di Meo
- Dipartimento di Chimica e Tecnologie del Farmaco; Università di Roma “La Sapienza,”; Roma 00185 Italy
| | - Felice Cerreto
- Dipartimento di Chimica e Tecnologie del Farmaco; Università di Roma “La Sapienza,”; Roma 00185 Italy
| | - Franco Alhaique
- Dipartimento di Chimica e Tecnologie del Farmaco; Università di Roma “La Sapienza,”; Roma 00185 Italy
| | - Michela Abrami
- Dipartimento di Scienze della Vita, Ospedale di Cattinara; Università di Trieste; Trieste I-34149 Italy
| | - Mario Grassi
- Dipartimento di Ingegneria e Architettura; Università di Trieste; Trieste 34127 Italy
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Pawar S, Pande V. Oleic Acid Coated Gelatin Nanoparticles Impregnated Gel for Sustained Delivery of Zaltoprofen: Formulation and Textural Characterization. Adv Pharm Bull 2015; 5:537-48. [PMID: 26819927 DOI: 10.15171/apb.2015.073] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Revised: 06/02/2015] [Accepted: 07/30/2015] [Indexed: 12/13/2022] Open
Abstract
PURPOSE In the present study, we have formulated zaltoprofen loaded, surface decorated, biodegradable gelatin nanogel and evaluated its texture characterization. METHODS The method used to prepare gelatin nanoparticles (GNP) was 'two step desolvation' and its surface decoration was performed with oleic acid (OA). The GNP was optimized by DOE software. Nanogels were evaluated for particle size entrapment efficiency, texture properties, SEM, in-vitro, ex-vivo drug release studies, in-vitro characterization, stability and in vivo evaluation of nanogel for anti-inflammatory activity was carried out by carrageenan induced rat paw edema method as an anti-inflammatory experimental model. RESULTS The formulated GNP with particle size and entrapment efficiency of optimized batch was found to be 247.1 nm and 76.21% respectively. The SEM of GNP shows smooth and spherical shape. In-vitro and Ex-vivo drug release shows that there was 69.47% and 78.59% drug released within 48 hrs. It follows Ritger peppas model, which indicates sustained drug release. The good texture properties of nanogel were observed from texture analysis graphs.In vivo studies of our formulation give significant results compared to the marketed nanogel. Stability data revealed stability of nanogel formulation up to 3 months. CONCLUSION The present approach can provide us promising results of the sustained analgesic activity and the stability of drug within the GNP.
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Affiliation(s)
- Savita Pawar
- R.C. Patel College of Pharmaceutical Education and Research, Shirpur, India 425405
| | - Vishal Pande
- Sanjivani College of Pharmaceutical Education and Research, Kopargaon, India 423603
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An Injectable PEG-BSA-Coumarin-GOx Hydrogel for Fluorescence Turn-on Glucose Detection. Appl Biochem Biotechnol 2015; 177:1115-26. [PMID: 26288081 DOI: 10.1007/s12010-015-1800-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 08/02/2015] [Indexed: 10/23/2022]
Abstract
Diabetes mellitus is a chronic metabolic disorder, requiring vigilant monitoring of blood glucose levels. In this study, an injectable fluorescent enzymatic hydrogel was designed for rapid glucose detection. The leakage-free glucose-responsive hydrogel was constructed by the covalent linkage of a multi-arm poly-(ethylene glycol) (PEG), bovine serum albumin (BSA), glucose oxidase (GOx), and 4-(aminomethyl)-6,7-dimethoxycoumarin (Coumarin-NH2). The GOx serves as glucose-recognition element and the pH-sensitive Coumarin-NH2 as a fluorescence turn-on reporter. The material properties of the fluorescent hydrogel were systematically characterized which show high elasticity with good mechanical strength. Upon the addition of glucose, the as-developed fluorescent hydrogel shows a fast response time, good sensitivity, and good reproducibility at physiological pH and ambient temperature. The glucose-sensing mechanism is based on the oxidation of the glucose by GOx that generates protons to change the local pH. Consequently, protonation of the covalently immobilized and pH-sensitive Coumarin-NH2 turns on the fluorescence of the coumarin. The fluorescence hydrogel developed holds great promise as an injectable, implantable glucose-sensing biomaterials for in vivo continuous glucose monitoring.
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Coviello T, Trotta AM, Marianecci C, Carafa M, Di Marzio L, Rinaldi F, Di Meo C, Alhaique F, Matricardi P. Gel-embedded niosomes: preparation, characterization and release studies of a new system for topical drug delivery. Colloids Surf B Biointerfaces 2014; 125:291-9. [PMID: 25524220 DOI: 10.1016/j.colsurfb.2014.10.060] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Revised: 08/10/2014] [Accepted: 10/19/2014] [Indexed: 10/24/2022]
Abstract
In the present paper physical gels, prepared with two polysaccharides, Xanthan and Locust Bean Gum, and loaded with non-ionic surfactant vesicles, are described. The vesicles, composed by Tween20 and cholesterol or by Tween85 and Span20, were loaded with Monoammonium glycyrrhizinate for release experiments. Size and zeta (ζ)-potential of the vesicles were evaluated and the new systems were characterized by rheological and dynamo-mechanical measurements. For an appropriate comparison, a Carbopol gel and a commercial gel for topical applications were also tested. The new formulations showed mechanical properties comparable with those of the commercial product indicating their suitability for topical applications. In vitro release experiments showed that the polysaccharide network protects the integrity of the vesicles and leads to their slow release without disruption of the aggregated structures. Furthermore, being the vesicles composed of molecules possessing enhancing properties, the permeation of the loaded drugs topically delivered can be improved. Thus, the new systems combine the advantages of matrices for a modified release (polymeric component) and those of an easier permeability across the skin (vesicle components). Finally, shelf live experiments indicated that the tested gel/vesicle formulations were stable over 1 year with no need of preservatives.
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Affiliation(s)
- T Coviello
- Department of Drug Chemistry and Technologies, "Sapienza", University of Rome, Rome, Italy
| | - A M Trotta
- Department of Drug Chemistry and Technologies, "Sapienza", University of Rome, Rome, Italy
| | - C Marianecci
- Department of Drug Chemistry and Technologies, "Sapienza", University of Rome, Rome, Italy
| | - M Carafa
- Department of Drug Chemistry and Technologies, "Sapienza", University of Rome, Rome, Italy.
| | - L Di Marzio
- Department of Pharmacy, University of Chieti "G. D'Annunzio", Chieti, Italy
| | - F Rinaldi
- Center for Life Nano Science@Sapienza, Istituto Italiano di Tecnologia, Viale Regina Elena 291, 00185 Rome, Italy
| | - C Di Meo
- Department of Drug Chemistry and Technologies, "Sapienza", University of Rome, Rome, Italy
| | - F Alhaique
- Department of Drug Chemistry and Technologies, "Sapienza", University of Rome, Rome, Italy
| | - P Matricardi
- Department of Drug Chemistry and Technologies, "Sapienza", University of Rome, Rome, Italy
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Hoosain FG, Choonara YE, Kumar P, Tomar LK, Tyagi C, du Toit LC, Pillay V. An epichlorohydrin-crosslinked semi-interpenetrating GG-PEO network as a xerogel matrix for sustained release of sulpiride. AAPS PharmSciTech 2014; 15:1292-306. [PMID: 24920521 DOI: 10.1208/s12249-014-0153-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Accepted: 05/14/2014] [Indexed: 11/30/2022] Open
Abstract
The current study involved the development of a novel sustained release crosslinked semi-IPN xerogel matrix tablet prepared by chemical crosslinking of poly(ethylene) oxide (PEO) and gellan gum (GG) employing epichlorohydrin (EPI) as crosslinker. A Box-Behnken design was employed for the statistical optimization of the matrix system to ascertain the ideal combination of native polymeric and crosslinking agents. Characterization studies were performed by employing standard polymer characterization techniques such as Fourier transform infrared spectrometry, differential scanning calorimetry, and scanning electron microscopy. Formulated matrix tablets displayed zero-order release kinetics, extending over 24 h. The mechanism of drug release was primarily by swelling and surface erosion. Crosslinked semi-IPN xerogel matrix tablets were compared to non-crosslinked polymer blends; results from the study conducted showed that the physiochemical properties of the PEO and GG were sufficiently modified to allow for sustained release of sulpiride with a 100% drug release at 24 h in a controlled manner as compared to non-crosslinked formulations which displayed further release beyond the test period. Crosslinked formulations displayed water uptake between 450 and 500% indicating a controlled rate of swelling and erosion allowing for sustained release. Surface morphology of the crosslinked system depicted a porous structure formed by interpenetrating networks of polymers, allowing for a greater degree of controlled penetration into the system affording it the ability to sustain drug release. Therefore, conclusively, based on the study performed, crosslinked PEO-GG allows for the sustained release of sulpiride from a hydrophilic semi-IPN xerogel matrix system.
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Bosio VE, López AG, Mukherjee A, Mechetti M, Castro GR. Tailoring doxorubicin sustainable release from biopolymeric smart matrix using congo red as molecular helper. J Mater Chem B 2014; 2:5178-5186. [DOI: 10.1039/c3tb20531b] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Ding W, Li Y, Hou X, Li G. Bleomycin A6-loaded anionic liposomes with in situ gel as a new antitumoral drug delivery system. Drug Deliv 2014; 23:88-94. [DOI: 10.3109/10717544.2014.905651] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Weiming Ding
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, China and
| | - Yanfang Li
- Central Lab, Peking University Third Hospital, Beijing, China
| | - Xucheng Hou
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, China and
| | - Guiling Li
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, China and
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Mazzuca C, Micheli L, Marini F, Bevilacqua M, Bocchinfuso G, Palleschi G, Palleschi A. Rheoreversible hydrogels in paper restoration processes: a versatile tool. Chem Cent J 2014; 8:10. [PMID: 24513147 PMCID: PMC3926867 DOI: 10.1186/1752-153x-8-10] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Accepted: 02/01/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Paper based artworks are probably ones of the most difficult materials to restore, because of their complexity and fragile structure. Cleaning of paper artifacts, one of the process commonly carried out during restoration, usually involves the use of solvents (organic or not), that may cause several troubles, like swelling and dissolution of some components, and may also be harmful to the users. RESULTS Innovative procedure for cleaning paper artworks is reported in this paper. It is based on the use of rheoreversible, biocompatible hydrogels containing poly(ethylene oxide) or poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) and α-cyclodextrin. We have studied two types of polymer with different hydrophobic properties in order to obtain two different hydrogels with slightly different cleaning capabilities. Our overall strategy has been to develop innovative systems based on these hydrogels so as to better confront the problems that a restorer faces during the cleaning of paper samples. Rheoreversible hydrogels are intriguing materials because their application and removal is not invasive and does not require a liquid treatment that could induce damage to the paper. CONCLUSIONS These hydrogels have been applied in the cleaning of both new and aged paper samples and their cleaning efficiency has been established. Moreover, by comparison with traditional methods, the greater efficacy of the proposed procedure has been demonstrated.To assess the cleaning efficacy of these hydrogels, a multidisciplinary approach, combining non-invasive spectroscopic infrared techniques together with scanning electron microscopy, chromatographic (HPLC) analysis and pH investigations has been used. Near infrared spectroscopy spectra were coupled with a chemometric analysis to achieve a better interpretation of data.This work constitutes a preliminary step towards focused study in the development of α-cyclodextrin/polymer hydrogel family which will allow cleaning of paper artifacts with peculiar characteristics.
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Affiliation(s)
| | | | | | | | | | | | - Antonio Palleschi
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma "Tor Vergata", Via della Ricerca Scientifica snc, Rome 00133, Italy.
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López-Cebral R, Paolicelli P, Romero-Caamaño V, Seijo B, Casadei MA, Sanchez A. Spermidine-Cross-linked Hydrogels as Novel Potential Platforms for Pharmaceutical Applications. J Pharm Sci 2013; 102:2632-43. [DOI: 10.1002/jps.23631] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Revised: 05/08/2013] [Accepted: 05/14/2013] [Indexed: 01/25/2023]
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Mazzuca C, Bocchinfuso G, Cacciotti I, Micheli L, Palleschi G, Palleschi A. Versatile hydrogels: an efficient way to clean paper artworks. RSC Adv 2013. [DOI: 10.1039/c3ra44387f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Coutu JM, Fatimi A, Berrahmoune S, Soulez G, Lerouge S. A new radiopaque embolizing agent for the treatment of endoleaks after endovascular repair: Influence of contrast agent on chitosan thermogel properties. J Biomed Mater Res B Appl Biomater 2012; 101:153-61. [DOI: 10.1002/jbm.b.32828] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Revised: 06/26/2012] [Accepted: 08/20/2012] [Indexed: 11/08/2022]
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Ansari SA, Matricardi P, Meo CD, Alhaique F, Coviello T. Evaluation of rheological properties and swelling behaviour of sonicated scleroglucan samples. Molecules 2012; 17:2283-97. [PMID: 22367024 PMCID: PMC6268210 DOI: 10.3390/molecules17032283] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Revised: 02/09/2012] [Accepted: 02/16/2012] [Indexed: 11/30/2022] Open
Abstract
Scleroglucan is a natural polysaccharide that has been proposed for various applications. However there is no investigation on its property variations when the molecular weight of this polymer is reduced. Scleroglucan was sonicated at two different polymer concentrations for different periods of time and the effect of sonication was investigated with respect to molecular weight variations and rheological properties. Molar mass, estimated by viscometric measurements, was drastically reduced already after a sonication for a few min. Sonicated samples were used for the preparation of gels in the presence of borate ions. The effect of borax on the new samples was investigated by recording the mechanical spectra and the flow curves. A comparison with the system prepared with the dialysed polymer was also carried out. The anisotropic elongation, observed with tablets of scleroglucan and borax, was remarkably reduced when the sonicated samples were used for the preparation of the gels.
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Affiliation(s)
- Siddique Akber Ansari
- Department of Drug Chemistry and Technologies, University "La Sapienza", 00185 Rome, Italy.
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Corrente F, Paolicelli P, Matricardi P, Tita B, Vitali F, Casadei MA. Novel pH-Sensitive Physical Hydrogels of Carboxymethyl Scleroglucan. J Pharm Sci 2012; 101:256-67. [DOI: 10.1002/jps.22766] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2011] [Revised: 07/04/2011] [Accepted: 09/01/2011] [Indexed: 02/03/2023]
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22
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Rheology and nanostructure of hydrophobically modified alginate (HMA) gels and solutions. Carbohydr Polym 2012; 87:524-530. [DOI: 10.1016/j.carbpol.2011.08.025] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2011] [Revised: 08/04/2011] [Accepted: 08/05/2011] [Indexed: 11/21/2022]
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Hurler J, Engesland A, Poorahmary Kermany B, Škalko-Basnet N. Improved texture analysis for hydrogel characterization: Gel cohesiveness, adhesiveness, and hardness. J Appl Polym Sci 2011. [DOI: 10.1002/app.35414] [Citation(s) in RCA: 137] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Schmid J, Müller-Hagen D, Bekel T, Funk L, Stahl U, Sieber V, Meyer V. Transcriptome sequencing and comparative transcriptome analysis of the scleroglucan producer Sclerotium rolfsii. BMC Genomics 2010; 11:329. [PMID: 20504312 PMCID: PMC2887420 DOI: 10.1186/1471-2164-11-329] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2009] [Accepted: 05/26/2010] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The plant pathogenic basidiomycete Sclerotium rolfsii produces the industrially exploited exopolysaccharide scleroglucan, a polymer that consists of (1 --> 3)-beta-linked glucose with a (1 --> 6)-beta-glycosyl branch on every third unit. Although the physicochemical properties of scleroglucan are well understood, almost nothing is known about the genetics of scleroglucan biosynthesis. Similarly, the biosynthetic pathway of oxalate, the main by-product during scleroglucan production, has not been elucidated yet. In order to provide a basis for genetic and metabolic engineering approaches, we studied scleroglucan and oxalate biosynthesis in S. rolfsii using different transcriptomic approaches. RESULTS Two S. rolfsii transcriptomes obtained from scleroglucan-producing and scleroglucan-nonproducing conditions were pooled and sequenced using the 454 pyrosequencing technique yielding approximately 350,000 reads. These could be assembled into 21,937 contigs and 171,833 singletons, for which 6,951 had significant matches in public protein data bases. Sequence data were used to obtain first insights into the genomics of scleroglucan and oxalate production and to predict putative proteins involved in the synthesis of both metabolites. Using comparative transcriptomics, namely Agilent microarray hybridization and suppression subtractive hybridization, we identified approximately 800 unigenes which are differently expressed under scleroglucan-producing and non-producing conditions. From these, candidate genes were identified which could represent potential leads for targeted modification of the S. rolfsii metabolism for increased scleroglucan yields. CONCLUSIONS The results presented in this paper provide for the first time genomic and transcriptomic data about S. rolfsii and demonstrate the power and usefulness of combined transcriptome sequencing and comparative microarray analysis. The data obtained allowed us to predict the biosynthetic pathways of scleroglucan and oxalate synthesis and to identify important genes putatively involved in determining scleroglucan yields. Moreover, our data establish the first sequence database for S. rolfsii, which allows research into other biological processes of S. rolfsii, such as host-pathogen interaction.
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Affiliation(s)
- Jochen Schmid
- Chair of Chemistry of Biogenic Resources, Straubing Centre of Science, Technische Universität München, Schulgasse 16, 94315 Straubing, Germany.
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Li Y, Li Y, Yao Y, Liu B, Chen M, Song X, Dong M. Two-dimensional scaffold layer formations on a solid surface through xanthan polysaccharide: Temperature effect. Colloids Surf B Biointerfaces 2009; 74:136-9. [DOI: 10.1016/j.colsurfb.2009.07.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2009] [Revised: 07/08/2009] [Accepted: 07/08/2009] [Indexed: 02/05/2023]
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Colinet I, Dulong V, Mocanu G, Picton L, Le Cerf D. New amphiphilic and pH-sensitive hydrogel for controlled release of a model poorly water-soluble drug. Eur J Pharm Biopharm 2009; 73:345-50. [PMID: 19631739 DOI: 10.1016/j.ejpb.2009.07.008] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2009] [Revised: 07/15/2009] [Accepted: 07/17/2009] [Indexed: 11/28/2022]
Abstract
This paper presents the development of new pH-sensitive, amphiphilic and biocompatible hydrogels based on alginate-g-PCL, cross-linked with calcium ions to form beads, prepared for controlled delivery of poorly water-soluble drug. We have focused our study on the effect of the length of PCL chains (530 and 1250 g mol(-1)). Swelling profiles obtained clearly indicated that these hydrogels swell slightly (10-14%) in a simulated gastric fluid (pH 1.2), and strongly (700-1300% before disintegration) in a simulated intestinal fluid (pH 6.8). In both media, rates of swelling were lower for beads based on amphiphilic derivatives than for alginate/Ca2+ ones due to the hydrophobic PCL grafts, and decreased when hydrophobic character increased. A model drug, theophylline, was entrapped into these hydrogels and release studies were carried out. The drug was protected in acidic fluid (only 14-20% of release for alginate-g-PCL hydrogel against 35% of release for alginate hydrogel during 350 min). The drug is released completely in neutral fluid due to ion exchanges and disintegration of the hydrogel. PCL leads to decrease in the release kinetics in SIF (2h for alginate-g-PCL/Ca2+ beads against 1h for alginate/Ca2+ beads). It was demonstrated that the establishment of clusters inside beads by intramolecular interactions between PCL grafts of 530 g mol(-1) in salt media allowed to retain the drug and to slow down its release considerably.
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Affiliation(s)
- I Colinet
- University of Rouen, Mont Saint Aignan, France
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Shi JH, Liu XY, Li JL, Strom CS, Xu HY. Spherulitic networks: from structure to rheological property. J Phys Chem B 2009; 113:4549-54. [PMID: 19292435 DOI: 10.1021/jp8035023] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A finite element method based on ABAQUS is employed to examine the correlation between the microstructure and the elastic response of planar Cayley treelike fiber networks. It is found that the elastic modulus of the fiber network decreases drastically with the fiber length, following the power law. The power law of elastic modulus G' vs the correlation length xi obtained from this simulation has an exponent of -1.71, which is close to the exponent of -1.5 for a single-domain network of agar gels. On the other hand, the experimental results from multidomain networks give rise to a power law index of -0.49. The difference between -1.5 and -0.49 can be attributed to the multidomain structure, which weakens the structure of the overall system and therefore suppresses the increase in G'. In addition, when the aspect ratio of the fiber is smaller than 20, the radius of the fiber cross-section has a great impact on the network elasticity, while, when the aspect ratio is larger than 20, it has almost no effect on the elastic property of the network. The stress distribution in the network is uniform due to the symmetrical network structure. This study provides a general understanding of the correlation between microscopic structure and the macroscopic properties of soft functional materials.
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Affiliation(s)
- Jing Hua Shi
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore
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Feeney M, Casadei MA, Matricardi P. Carboxymethyl derivative of scleroglucan: a novel thermosensitive hydrogel forming polysaccharide for drug delivery applications. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2009; 20:1081-1087. [PMID: 19132513 DOI: 10.1007/s10856-008-3665-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2008] [Accepted: 12/09/2008] [Indexed: 05/27/2023]
Abstract
A carboxymethyl derivative of scleroglucan (Scl-CM) with a derivatization degree of 65 +/- 5% was synthesized. The rheological behaviour of this novel polymer was studied and compared with that of the starting polymer. We observed that the charged moieties carried on the chains could prevent the triple helix formation of Scl. Scl-CM aqueous solutions behave like true polymer solutions up to 1% w/v, whereas above this concentration a weak gel behaviour was observed. CaCl(2) addition to aqueous Scl-CM solutions led to a physical gel formation; the hydrogel strength was related to polymer and CaCl(2) concentrations. Temperature sweeps, registered at 1 Hz on hydrogels differing in CaCl(2) concentration, evidenced a gel --> sol transition in the range of 30-40 degrees C, depending on the molar ratio between carboxylic groups and Ca(+2). In order to verify a possible use of these hydrogels as drug delivery systems, acyclovir was loaded into the network. Rheological analysis evidenced that the loaded drug can affect the hydrogel elastic modulus. The release of acyclovir in phosphate buffer was evaluated at different temperatures in order to assess the suitability of this novel drug delivery system in topical applications.
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Affiliation(s)
- Michelle Feeney
- Dipartimento di Chimica e Tecnologie del Farmaco, Sapienza Università di Roma, Rome, Italy
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Williams SR, Lepene BS, Thatcher CD, Long TE. Synthesis and Characterization of Poly(ethylene glycol)−Glutathione Conjugate Self-Assembled Nanoparticles for Antioxidant Delivery. Biomacromolecules 2008; 10:155-61. [DOI: 10.1021/bm801058j] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Sharlene R. Williams
- Department of Chemistry, Macromolecules and Interfaces Institute, Department of Biomedical and Veterinary Sciences, Virginia Tech, Blacksburg, Virginia 24061, and School of Applied Arts and Sciences, Arizona State University, Mesa, Arizona 85212
| | - Benjamin S. Lepene
- Department of Chemistry, Macromolecules and Interfaces Institute, Department of Biomedical and Veterinary Sciences, Virginia Tech, Blacksburg, Virginia 24061, and School of Applied Arts and Sciences, Arizona State University, Mesa, Arizona 85212
| | - Craig D. Thatcher
- Department of Chemistry, Macromolecules and Interfaces Institute, Department of Biomedical and Veterinary Sciences, Virginia Tech, Blacksburg, Virginia 24061, and School of Applied Arts and Sciences, Arizona State University, Mesa, Arizona 85212
| | - Timothy E. Long
- Department of Chemistry, Macromolecules and Interfaces Institute, Department of Biomedical and Veterinary Sciences, Virginia Tech, Blacksburg, Virginia 24061, and School of Applied Arts and Sciences, Arizona State University, Mesa, Arizona 85212
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Pasut E, Toffanin R, Voinovich D, Pedersini C, Murano E, Grassi M. Mechanical and diffusive properties of homogeneous alginate gels in form of particles and cylinders. J Biomed Mater Res A 2008; 87:808-18. [DOI: 10.1002/jbm.a.31680] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Grassi M. Membranes in Drug Delivery. HANDBOOK OF MEMBRANE SEPARATIONS 2008:427-471. [DOI: 10.1201/9781420009484.ch15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Rokhade AP, Shelke NB, Patil SA, Aminabhavi TM. Novel hydrogel microspheres of chitosan and pluronic F-127 for controlled release of 5-fluorouracil. J Microencapsul 2008; 24:274-88. [PMID: 17454438 DOI: 10.1080/02652040701281365] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Hydrogel microspheres of chitosan (CS) and Pluronic F127 (PF-127) were prepared by the emulsion-crosslinking method employing glutaraldehyde (GA) as a crosslinker. 5-Fluorouracil (5-FU), an anticancer drug with good water solubility, was encapsulated into hydrogel microspheres. Various formulations were prepared by varying the ratio of CS and PF-127, % drug loading and amount of GA. Microspheres were characterized by Fourier transform infrared (FTIR) spectroscopy to confirm the absence of chemical interactions between drug, polymer and the crosslinking agent. Scanning electron microscopy (SEM) was performed to study the surface morphology of the microspheres. SEM showed that microspheres have smooth shiny surfaces. Particle size, as measured by laser light scattering technique, gave an average size ranging from 110 to 382 microm. Differential scanning calorimetry (DSC) and X-ray diffraction (X-RD) studies were performed to understand the crystalline nature of the drug after encapsulation into hydrogel microspheres. Encapsulation of the drug up to 86% achieved was measured by UV spectroscopy. Equilibrium swelling experiments were performed in distilled water. Diffusion coefficients (D) of water through microspheres were estimated by an empirical equation. In vitro release studies indicated the dependence of release rate on the extent of crosslinking, drug loading and the amount of PF-127 used to produce the microspheres; slow release was extended up to 24 h. The release data were also fitted to an empirical equation to compute the diffusional exponent (n), which indicated that the release mechanism followed the non-Fickian trend.
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Affiliation(s)
- Ajit P Rokhade
- Drug Delivery Division, Center of Excellence in Polymer Science, Karnatak University, Dharwad 580 003, India
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Casadei MA, Matricardi P, Fabrizi G, Feeney M, Paolicelli P. Physical gels of a carboxymethyl derivative of scleroglucan: Synthesis and characterization. Eur J Pharm Biopharm 2007; 67:682-9. [PMID: 17537623 DOI: 10.1016/j.ejpb.2007.04.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2007] [Revised: 04/02/2007] [Accepted: 04/12/2007] [Indexed: 10/23/2022]
Abstract
A carboxymethyl derivative of scleroglucan (Scl-CM) was synthesized and characterized through FT-IR, 1H NMR and potentiometer titration. Rheological studies allowed evidencing the effect produced by the introduction of the carboxymethyl moiety on the native polymer. The mechanical spectrum of the scleroglucan solution showed a weak gel behaviour, while the derivative one looked like a system near the gel point, that evolved to a gel state depending on the concentration. This difference could be related to conformational changes due to the introduction of the negative charges on the chains. Different concentrations of Ca2+, added to the aqueous solutions of Scl-CM, were able to deeply modify the resulting system, showing a sharp transition toward a gel like behaviour. Acyclovir was loaded into the hydrogels obtained with different amounts of polymer and salt. The release rate of the drug from these systems was strictly related to both concentrations of salt and polymer. The obtained results suggest a possible employment of these new hydrogels for topical formulations or in situ implantation.
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Affiliation(s)
- Maria Antonietta Casadei
- Dipartimento di Studi di Chimica e Tecnologia delle Sostanze Biologicamente Attive, Sapienza Università di Roma, Rome, Italy.
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Grassi G, Coceani N, Farra R, Dapas B, Racchi G, Fiotti N, Pascotto A, Rehimers B, Guarnieri G, Grassi M. Propaedeutic study for the delivery of nucleic acid-based molecules from PLGA microparticles and stearic acid nanoparticles. Int J Nanomedicine 2007; 1:523-33. [PMID: 17722283 PMCID: PMC2676633 DOI: 10.2147/nano.2006.1.4.523] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
We studied the mechanism governing the delivery of nucleic acid-based drugs (NABD) from microparticles and nanoparticles in zero shear conditions, a situation occurring in applications such as in situ delivery to organ parenchyma. The delivery of a NABD molecule from poly(DL-lactide-co-glycolide) (PLGA) microparticles and stearic acid (SA) nanoparticles was studied using an experimental apparatus comprising a donor chamber separated from the receiver chamber by a synthetic membrane. A possible toxic effect on cell biology, as evaluated by studying cell proliferation, was also conducted forjust PLGA microparticles. A mathematical model based on the hypothesis that NABD release from particles is due to particle erosion was used to interpret experimental release data. Despite zero shear conditions imposed in the donor chamber, particle erosion was the leading mechanism for NABD release from both PLGA microparticles and SA nanoparticles. PLGA microparticle erosion speed is one order of magnitude higher than that of competing SA nanoparticles. Finally, no deleterious effects of PLGA microparticles on cell proliferation were detected. Thus, the data here reported can help optimize the delivery systems aimed at release of NABD from micro- and nanoparticles.
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Affiliation(s)
- G Grassi
- Department of Internal Medicine, University Hospital of Trieste, Italy
- Department of Molecular Pathology, University Hospital of Tübingen, Tübingen, Germany
| | - N Coceani
- Department of Biochemistry, Biophysics and Macromolecular Chemistry, University of Trieste, Italy
| | - R Farra
- Department of Internal Medicine, University Hospital of Trieste, Italy
| | - B Dapas
- Department of Internal Medicine, University Hospital of Trieste, Italy
| | - G Racchi
- Department of Molecular Pathology, University Hospital of Tübingen, Tübingen, Germany
| | - N Fiotti
- Department of Internal Medicine, University Hospital of Trieste, Italy
| | - A Pascotto
- Cardiovascular Department, Civic Hospital, Venezia, Italy
| | - B Rehimers
- Cardiovascular Department, Civic Hospital, Venezia, Italy
| | - G Guarnieri
- Department of Internal Medicine, University Hospital of Trieste, Italy
| | - M Grassi
- Department of Chemical Engineering, DICAMP, University of Trieste, Italy
- Correspondence: Mario Grassi, Department of Chemical, Environmental and Raw Materials Engineering, DICAMP, Piazzale Europa 1, I - 34127, Trieste, Italy, Tel +39 040 558 3435, Fax +39 040 569823, Email
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Sandolo C, Matricardi P, Alhaique F, Coviello T. Dynamo-mechanical and rheological characterization of guar gum hydrogels. Eur Polym J 2007. [DOI: 10.1016/j.eurpolymj.2007.04.051] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ramanujan R, Purushotham S, Chia M. Processing and characterization of activated carbon coated magnetic particles for biomedical applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2007. [DOI: 10.1016/j.msec.2006.06.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Coviello T, Matricardi P, Marianecci C, Alhaique F. Polysaccharide hydrogels for modified release formulations. J Control Release 2007; 119:5-24. [PMID: 17382422 DOI: 10.1016/j.jconrel.2007.01.004] [Citation(s) in RCA: 573] [Impact Index Per Article: 33.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2006] [Accepted: 01/04/2007] [Indexed: 12/23/2022]
Abstract
Hydrogels are three-dimensional, hydrophilic, polymeric networks, with chemical or physical cross-links, capable of imbibing large amounts of water or biological fluids. Among the numerous macromolecules that can be used for hydrogel formation, polysaccharides are extremely advantageous compared to synthetic polymers being widely present in living organisms and often being produced by recombinant DNA techniques. Coming from renewable sources, polysaccharides also have frequently economical advantages over synthetic polymers. Polysaccharides are usually non-toxic, biocompatible and show a number of peculiar physico-chemical properties that make them suitable for different applications in drug delivery systems. We review here a selection of the most important polysaccharides that have been studied and exploited in several fields related to pharmaceutics. Particular attention has been focused on the techniques used for the hydrogel network preparation, on the drug delivery results, on clinical applications as well as on the possible use of such systems as scaffolds for tissue engineering.
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Matricardi P, Onorati I, Coviello T, Alhaique F. Drug delivery matrices based on scleroglucan/alginate/borax gels. Int J Pharm 2006; 316:21-8. [PMID: 16554128 DOI: 10.1016/j.ijpharm.2006.02.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2005] [Revised: 01/17/2006] [Accepted: 02/13/2006] [Indexed: 10/24/2022]
Abstract
The aim of this work is to obtain a new drug delivery matrix, especially designed for protein delivery, based on biodegradable and biocompatible polymers, and to describe its main physico-chemical properties. A polysaccharide based semi-interpenetrating polymer network (semi-IPN) was built up, composed by sodium alginate chains interspersed into a scleroglucan/borax hydrogel network. Tablets were obtained by compression of the resulting freeze-dried hydrogel. The different release and physico-chemical properties possessed by the two starting polymers in various aqueous media were combined in the new matrix. In this work, description is given of the in vitro ability of the matrix to deliver in a controlled manner a protein, Myoglobin, in distilled water, simulated gastric fluid and simulated intestinal fluid; the release, simulating a gastric passage, followed by an enteric delivery, was also carried out. Water uptake data, colorimetric experiments and scanning electron microscopy images are given for the characterization of this new solid dosage form; the importance of the borax presence is also discussed.
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Affiliation(s)
- Pietro Matricardi
- Dipartimento di Studi di Chimica e Tecnologia delle Sostanze Biologicamente Attive, Università La Sapienza, P.le A. Moro 5, 00185 Rome, Italy
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Coviello T, Matricardi P, Alhaique F. Drug delivery strategies using polysaccharidic gels. Expert Opin Drug Deliv 2006; 3:395-404. [PMID: 16640499 DOI: 10.1517/17425247.3.3.395] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Hydrogels are hydrophilic polymeric networks, with chemical or physical crosslinks, that are capable of swell and can retain a large amount of water. Among the numerous types of macromolecules that can be used for hydrogel formation, polysaccharides show very attractive advantages in comparison to synthetic polymers. They are widely present in living organisms, are usually abundant and show a number of peculiar physicochemical properties; furthermore, these macromolecules are, in most cases, non-toxic, biocompatible and can be obtained from renewable sources. For these reasons, polysaccharides seem to be particularly suitable for different applications in the wide field of pharmaceutics. As examples of the studies that have been carried out on this topic, this review will focus on two polysaccharides, alginate and xyloglucan. Alginate has been, and still is, extensively investigated and has numerous industrial applications, whereas xyloglucan was chosen because, although it has been much less studied, it shows interesting properties that should find important practical uses in the near future. The possible advantages of physical gels over those that are chemically crosslinked are also discussed.
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Affiliation(s)
- Tommasina Coviello
- University La Sapienza, Faculty of Pharmacy, P le Aldo Moro 5, 00185 Rome, Italy.
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