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Chen Y, Wei W, Zhu Y, Luo J, Liu R, Liu X. Synthesis of Temperature/pH Dual-Stimuli-Response Multicompartmental Microcapsules via Pickering Emulsion for Preprogrammable Payload Release. ACS Appl Mater Interfaces 2020; 12:4821-4832. [PMID: 31903756 DOI: 10.1021/acsami.9b20999] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Stimuli-responsive microcapsules, which can release the encapsulated payload under various environmental stimuli, have attracted great interests of the food, pharmaceutical, cosmetics, and agricultural fields in recent years. However, most reported responsive microcapsules normally have a single storage area and thus load/release only one type of payload under one stimulus. In this work, we fabricated a novel kind of multicompartmental intelligent microcapsule with two storage areas and independently controlled (preprogrammable) releasing behavior under different stimuli via rapid photopolymerization of Pickering emulsions. In our strategy, a temperature-sensitive polymeric (N-isopropyl acrylamide, pNIPAM) particle was prepared and loaded with Nile Red (NR), which was then employed as a Pickering emulsifier to stabilize oil-in-water droplets. The oil was composed of pH-responsive monomers and oil-soluble fluorescent green (OG). Upon exposure to photoirradiation, pH-responsive monomers were polymerized along the interior of the droplets and converted into microcapsules. With NR in the temperature-sensitive pNIPAM@NR particles and OG in the interior of the microcapsules, the as-prepared microcapsules possess dual-carrier capability with two payloads encapsulated dependently in two different compartments. In addition, the microcapsules could respond to two different external stimuli (temperature and pH) and realize the selective and independent release of encapsulated molecules (NR and OG) from the shell and core without any mutual interference. More importantly, the release of NR and OG can be programmed by preprogramming the order of the stimulus responses, which can be altered. Our work develops a simple and effective strategy to fabricate responsive multicompartment microcapsules with preprogrammable release of different molecules.
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Affiliation(s)
- Yaxin Chen
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering , Jiangnan University , Wuxi , Jiangsu 214122 , P. R. China
| | - Wei Wei
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering , Jiangnan University , Wuxi , Jiangsu 214122 , P. R. China
| | - Ye Zhu
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering , Jiangnan University , Wuxi , Jiangsu 214122 , P. R. China
| | - Jing Luo
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering , Jiangnan University , Wuxi , Jiangsu 214122 , P. R. China
| | - Ren Liu
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering , Jiangnan University , Wuxi , Jiangsu 214122 , P. R. China
| | - Xiaoya Liu
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering , Jiangnan University , Wuxi , Jiangsu 214122 , P. R. China
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Ma Y, Feng Y, Zeng W, Luo H. Anthocyanin Encapsulated by Ferulic Acid-Grafted-Maltodextrin (FA-g-MD) Microcapsules Potentially Improved its Free Radical Scavenging Capabilities Against H 2O 2-Induced Oxidative Stress. Molecules 2019; 24:molecules24081596. [PMID: 31018491 PMCID: PMC6515387 DOI: 10.3390/molecules24081596] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 04/12/2019] [Accepted: 04/19/2019] [Indexed: 11/16/2022] Open
Abstract
This study aimed to investigate the antioxidant activity and release behavior of anthocyanin (ANC) loaded within FA-g-MD wall (ANC-FA-g-MD microcapsule) in vitro. The microencapsulation of ANC was prepared by spray drying and displayed a biphasic release profile. The combination of ANC and FA-g-MD (0.0625–1 mg/mL) showed a higher antioxidant activity than that of both individuals. A possible intermolecular interaction between ANC and FA-g-MD was studied by UV-vis spectra. Intracellular reactive oxygen species (ROS), 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide (MTT) test, and protein expression of quinone oxidoreductase 1(NQO1), glutathione reductase (GSR) and γ-glutamate cysteine ligase catalytic subunit (γ-GCLC) were measured through human colon cancer cells (HT-29). After a 24-hour incubation of the HT-29, the combinations (0–60 μg/mL) exhibited a high potential to diminish the ROS level. And the distinct upregulated expressions of GCLC and NQO1 of HT-29 were detected after treatment with combinations compared to those of single ones. These results suggested that the ANC-FA-g-MD microcapsules exerts enhanced antioxidant effect with capability of the modulation of GCLC and NQO1.
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Affiliation(s)
- Yi Ma
- College of Bioengineering, Sichuan University of Science and Engineering, Zigong 643000, China.
| | - Yunhui Feng
- Department of Physical Education, Guangzhou University, Guangzhou 510006, China.
| | - Wanling Zeng
- College of Bioengineering, Sichuan University of Science and Engineering, Zigong 643000, China.
| | - Huibo Luo
- College of Bioengineering, Sichuan University of Science and Engineering, Zigong 643000, China.
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3
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Hu Q, Chen Y, Hong J, Jin S, Zou G, Chen L, Chen DZ. A Smart Epoxy Composite Based on Phase Change Microcapsules: Preparation, Microstructure, Thermal and Dynamic Mechanical Performances. Molecules 2019; 24:molecules24050916. [PMID: 30845646 PMCID: PMC6429137 DOI: 10.3390/molecules24050916] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Revised: 02/24/2019] [Accepted: 03/01/2019] [Indexed: 11/29/2022] Open
Abstract
Microencapsulated phase change materials (MicroPCMs)-incorporated in epoxy composites have drawn increasing interest due to their promising application potential in the fields of thermal energy storage and temperature regulation. However, the study on the effect of MicroPCMs on their microstructure, thermal and viscoelastic properties is quite limited. Herein, a new type of smart epoxy composite incorporated with polyurea (PU)-shelled MicroPCMs was fabricated via solution casting method. Field emission-scanning electron microscope (FE-SEM) images revealed that the MicroPCMs were uniformly distributed in the epoxy matrix. The thermal stabilities, conductivities, phase change properties, and dynamic mechanical behaviors of the composite were studied by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), thermal constant analyzer and infrared thermography. The results suggested that the heat storage ability of the composites was improved by increasing the MicroPCMs content. The thermal stability of MicroPCMs was found to be enhanced after incorporation into the matrix, and the MicroPCMs-incorporated epoxy composites showed a good thermal cycling reliability. Moreover, the incorporation of MicroPCMs reduced the composites’ storage modulus but increased the glass transition temperature (Tg) as a result of their restriction to the chain motion of epoxy resin. Besides, a less marked heating effect for the composite was explored through infrared thermography analysis, demonstrating the good prospect for temperature regulation application.
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Affiliation(s)
- Qinghong Hu
- SDCIC Construction Group Co., Ltd., Shenzhen 518038, China.
| | - Yan Chen
- Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, China.
| | - Jiaoling Hong
- Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, China.
| | - Shan Jin
- SDCIC Construction Group Co., Ltd., Shenzhen 518038, China.
| | - Guangjin Zou
- SDCIC Construction Group Co., Ltd., Shenzhen 518038, China.
| | - Ling Chen
- Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
| | - Da-Zhu Chen
- Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, China.
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Tolve R, Condelli N, Caruso MC, Genovese F, Di Renzo GC, Mauriello G, Galgano F. Preparation and characterization of microencapsulated phytosterols for the formulation of functional foods: Scale up from laboratory to semi-technical production. Food Res Int 2018; 116:1274-1281. [PMID: 30716916 DOI: 10.1016/j.foodres.2018.10.016] [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: 07/13/2018] [Revised: 08/29/2018] [Accepted: 10/05/2018] [Indexed: 11/19/2022]
Abstract
Phytosterols were microencapsulated by spray drying in a shell represented by WPI, inulin and chitosan at four different combinations through the formulation of aqueous suspensions. Moreover, two concentrations of Tween 80 (1.25% and 2.50% w/w) and two inlet temperatures (125 °C and 155 °C) were tested. The effect of the different experimental conditions on the process yield and on the microcapsules properties was evaluated. A significant effect of all variables on the microcapsule properties was found. Accordingly, the best performance, with the maximum loading capacity of 25%, was obtained by using only WPI as shell material, Tween 80 at 1.25% and inlet temperature of 155 °C. The process was successfully scaled-up from laboratory equipment to a semi-technical scale keeping the optimal shell formulation and process conditions.
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Affiliation(s)
- Roberta Tolve
- School of Agricultural, Forestry, Food and Environmental Sciences, University of Basilicata, Viale dell'Ateneo Lucano 10, Potenza 85100, Italy
| | - Nicola Condelli
- School of Agricultural, Forestry, Food and Environmental Sciences, University of Basilicata, Viale dell'Ateneo Lucano 10, Potenza 85100, Italy
| | - Marisa Carmela Caruso
- School of Agricultural, Forestry, Food and Environmental Sciences, University of Basilicata, Viale dell'Ateneo Lucano 10, Potenza 85100, Italy.
| | - Francesco Genovese
- School of Agricultural, Forestry, Food and Environmental Sciences, University of Basilicata, Viale dell'Ateneo Lucano 10, Potenza 85100, Italy
| | - Giovanni Carlo Di Renzo
- School of Agricultural, Forestry, Food and Environmental Sciences, University of Basilicata, Viale dell'Ateneo Lucano 10, Potenza 85100, Italy
| | - Gianluigi Mauriello
- Department of Agricultural Sciences, Division of Microbiology, University of Naples Federico II, via Università 100, Portici 80055, Italy
| | - Fernanda Galgano
- School of Agricultural, Forestry, Food and Environmental Sciences, University of Basilicata, Viale dell'Ateneo Lucano 10, Potenza 85100, Italy
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Feng J, Yang G, Zhang S, Liu Q, Jafari SM, McClements DJ. Fabrication and characterization of β-cypermethrin-loaded PLA microcapsules prepared by emulsion-solvent evaporation: loading and release properties. Environ Sci Pollut Res Int 2018; 25:13525-13535. [PMID: 29492820 DOI: 10.1007/s11356-018-1557-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [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: 10/09/2017] [Accepted: 02/13/2018] [Indexed: 06/08/2023]
Abstract
Microcapsulses can be designed to effectively encapsulate, protect, and control the release of pesticides. In this study, emulsion-solvent evaporation method was used to fabricate microcapsules using dichloromethane as the solvent, polylactic acid (PLA) as the carrier materials, poly(vinyl alcohol) as the emulsifier, and β-cypermethrin as the entrapped pesticide. The effects of process parameters on the microcapsules characteristics (size, loading content, and encapsulation efficiency) were investigated. Also, the release behavior of the β-cypermethrin was measured experimentally and modeled mathematically. Kinetic analysis indicated that release mechanism of β-cypermethrin was compatible to Fickian diffusion. By optimizing the process parameters, β-cypermethrin-loaded microcapsules were successfully produced with spherical shape, smooth surface, high encapsulation efficiency (> 80%), and a range of pesticide contents. These parameters could be adjusted to achieve delivery systems with desirable release profiles. The results are beneficial to develop delivery systems for rational and effective usage of pesticides.
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Affiliation(s)
- Jianguo Feng
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, 225009, China.
| | - Guantian Yang
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, 225009, China
| | - Shengwei Zhang
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, 225009, China
| | - Qi Liu
- School of Medicine, Yangzhou University, Yangzhou, China
| | - Seid Mahdi Jafari
- Department of Food Materials and Process Design Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
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6
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Alorabi AQ, Tarn MD, Gómez-Pastora J, Bringas E, Ortiz I, Paunov VN, Pamme N. On-chip polyelectrolyte coating onto magnetic droplets - towards continuous flow assembly of drug delivery capsules. Lab Chip 2017; 17:3785-3795. [PMID: 28991297 DOI: 10.1039/c7lc00918f] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Polyelectrolyte (PE) microcapsules for drug delivery are typically fabricated via layer-by-layer (LbL) deposition of PE layers of alternating charge on sacrificial template microparticles, which usually requires multiple incubation and washing steps that render the process repetitive and time-consuming. Here, ferrofluid droplets were explored for this purpose as an elegant alternative of templates that can be easily manipulated via an external magnetic field, and require only a simple microfluidic chip design and setup. Glass microfluidic devices featuring T-junctions or flow focusing junctions for the generation of oil-based ferrofluid droplets in an aqueous continuous phase were investigated. Droplet size was controlled by the microfluidic channel dimensions as well as the flow rates of the ferrofluid and aqueous phases. The generated droplets were stabilised by a surface active polymer, polyvinylpyrrolidone (PVP), and then guided into a chamber featuring alternating, co-laminar PE solutions and wash streams, and deflected across them by means of an external permanent magnet. The extent of droplet deflection was tailored by the flow rates, the concentration of magnetic nanoparticles in the droplets, and the magnetic field strength. PVP-coated ferrofluid droplets were deflected through solutions of polyelectrolyte and washing streams using several iterations of multilaminar flow designs. This culminated in an innovative "Snakes-and-Ladders" inspired microfluidic chip design that overcame various issues of the previous iterations for the deposition of layers of anionic poly(sodium-4-styrene sulfonate) (PSS) and cationic poly(fluorescein isothiocyanate allylamine hydrochloride) (PAH-FITC) onto the droplets. The presented method demonstrates a simple and rapid process for PE layer deposition in <30 seconds, and opens the way towards rapid layer-by-layer assembly of PE microcapsules for drug delivery applications.
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Affiliation(s)
- Ali Q Alorabi
- School of Mathematics and Physical Sciences, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
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Qin T, Han Y, Zhang P, Hassan Wani I, Nikolajeff F, Leifer K, Engqvist H. Template-free synthesis of phosphate-based spheres via modified supersaturated phosphate buffer solutions. J Mater Sci Mater Med 2017; 28:99. [PMID: 28534282 DOI: 10.1007/s10856-017-5911-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 05/05/2017] [Indexed: 06/07/2023]
Abstract
Modified supersaturated phosphate buffer solutions were used to synthesize phosphate-based spheres, including calcium phosphate (CaP), strontium phosphate (SrP) and barium phosphate (BaP). A series of ions concentrations in the modified phosphate buffer solutions were investigated in order to study their effects in precipitates morphologies. During synthesis, it was found that magnesium was the key factor in sphere formation. The morphologies of calcium phosphate, strontium phosphate and barium phosphate precipitates varied as the concentration of magnesium ions varied. When sufficient magnesium was provided, the precipitates appeared spherical, and the diameter was in range of 0.5-2 μm. The morphologies, compositions and structure of spheres were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and N2 adsorption analysis. Moreover, the application of magnesium substituted calcium phosphate spheres in dentin tubules occlusion was investigated.
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Affiliation(s)
- Tao Qin
- The Division for Applied Material Science, Department of Engineering Science, Uppsala University, Ångströmlaboratoriet, Lägerhyddsvägen 1,752 37, Uppsala, Sweden.
| | - Yuanyuan Han
- The Division for Applied Material Science, Department of Engineering Science, Uppsala University, Ångströmlaboratoriet, Lägerhyddsvägen 1,752 37, Uppsala, Sweden
| | - Peng Zhang
- The Division for Nanotechnology and Functional Materials, Department of Engineering Science, Uppsala University, Ångströmlaboratoriet, Lägerhyddsvägen 1,752 37, Uppsala, Sweden
| | - Ishtiaq Hassan Wani
- The Division for Applied Material Science, Department of Engineering Science, Uppsala University, Ångströmlaboratoriet, Lägerhyddsvägen 1,752 37, Uppsala, Sweden
| | - Fredrik Nikolajeff
- The Division for Applied Material Science, Department of Engineering Science, Uppsala University, Ångströmlaboratoriet, Lägerhyddsvägen 1,752 37, Uppsala, Sweden
| | - Klaus Leifer
- The Division for Applied Material Science, Department of Engineering Science, Uppsala University, Ångströmlaboratoriet, Lägerhyddsvägen 1,752 37, Uppsala, Sweden
| | - Håkan Engqvist
- The Division for Applied Material Science, Department of Engineering Science, Uppsala University, Ångströmlaboratoriet, Lägerhyddsvägen 1,752 37, Uppsala, Sweden
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Dupré de Baubigny J, Trégouët C, Salez T, Pantoustier N, Perrin P, Reyssat M, Monteux C. One-Step Fabrication of pH-Responsive Membranes and Microcapsules through Interfacial H-Bond Polymer Complexation. Sci Rep 2017; 7:1265. [PMID: 28455535 PMCID: PMC5430763 DOI: 10.1038/s41598-017-01374-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Accepted: 03/27/2017] [Indexed: 11/09/2022] Open
Abstract
Biocompatible microencapsulation is of widespread interest for the targeted delivery of active species in fields such as pharmaceuticals, cosmetics and agro-chemistry. Capsules obtained by the self-assembly of polymers at interfaces enable the combination of responsiveness to stimuli, biocompatibility and scaled up production. Here, we present a one-step method to produce in situ membranes at oil-water interfaces, based on the hydrogen bond complexation of polymers between H-bond acceptor and donor in the oil and aqueous phases, respectively. This robust process is realized through different methods, to obtain capsules of various sizes, from the micrometer scale using microfluidics or rotor-stator emulsification up to the centimeter scale using drop dripping. The polymer layer exhibits unique self-healing and pH-responsive properties. The membrane is viscoelastic at pH = 3, softens as pH is progressively raised, and eventually dissolves above pH = 6 to release the oil phase. This one-step method of preparation paves the way to the production of large quantities of functional capsules.
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Affiliation(s)
- Julien Dupré de Baubigny
- ESPCI Paris, PSL Research University, CNRS UMR 7615, Laboratoire Sciences et Ingénierie de la Matière Molle, 10 rue Vauquelin, 75231, Paris, Cedex 05, France
| | - Corentin Trégouët
- ESPCI Paris, PSL Research University, CNRS UMR 7615, Laboratoire Sciences et Ingénierie de la Matière Molle, 10 rue Vauquelin, 75231, Paris, Cedex 05, France
| | - Thomas Salez
- ESPCI Paris, PSL Research University, CNRS UMR 7083, Laboratoire Gulliver, 10 rue Vauquelin, 75231, Paris, Cedex 05, France
- Global Institution for Collaborative Research and Education, Global Station for Soft Matter, Hokkaido University, Sapporo, Hokkaido, 060-0808, Japan
| | - Nadège Pantoustier
- ESPCI Paris, PSL Research University, CNRS UMR 7615, Laboratoire Sciences et Ingénierie de la Matière Molle, 10 rue Vauquelin, 75231, Paris, Cedex 05, France
| | - Patrick Perrin
- ESPCI Paris, PSL Research University, CNRS UMR 7615, Laboratoire Sciences et Ingénierie de la Matière Molle, 10 rue Vauquelin, 75231, Paris, Cedex 05, France
| | - Mathilde Reyssat
- ESPCI Paris, PSL Research University, CNRS UMR 7083, Laboratoire Gulliver, 10 rue Vauquelin, 75231, Paris, Cedex 05, France.
| | - Cécile Monteux
- ESPCI Paris, PSL Research University, CNRS UMR 7615, Laboratoire Sciences et Ingénierie de la Matière Molle, 10 rue Vauquelin, 75231, Paris, Cedex 05, France.
- Global Institution for Collaborative Research and Education, Global Station for Soft Matter, Hokkaido University, Sapporo, Hokkaido, 060-0808, Japan.
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Baki A, Rahman CV, White LJ, Scurr DJ, Qutachi O, Shakesheff KM. Surface modification of PdlLGA microspheres with gelatine methacrylate: Evaluation of adsorption, entrapment, and oxygen plasma treatment approaches. Acta Biomater 2017; 53:450-459. [PMID: 28093368 PMCID: PMC5424780 DOI: 10.1016/j.actbio.2017.01.042] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 01/11/2017] [Accepted: 01/12/2017] [Indexed: 11/16/2022]
Abstract
Injectable poly (dl-lactic-co-glycolic acid) (PdlLGA) microspheres are promising candidates as biodegradable controlled release carriers for drug and cell delivery applications; however, they have limited functional groups on the surface to enable dense grafting of tissue specific biocompatible molecules. In this study we have evaluated surface adsorption, entrapment and oxygen plasma treatment as three approaches to modify the surfaces of PdlLGA microspheres with gelatine methacrylate (gel-MA) as a biocompatible and photo cross-linkable macromolecule. Time of flight secondary ion mass spectroscopy (TOF SIMS) and X-ray photoelectron spectroscopy (XPS) were used to detect and quantify gel-MA on the surfaces. Fluorescent and scanning electron microscopies (SEM) were used to image the topographical changes. Human mesenchymal stem cells (hMSCs) of immortalised cell line were cultured on the surface of gel-MA modified PdlLGA microspheres and Presto-Blue assay was used to study the effect of different surface modifications on cell proliferation. Data analysis showed that the oxygen plasma treatment approach resulted in the highest density of gel-MA deposition. This study supports oxygen plasma treatment as a facile approach to modify the surface of injectable PdlLGA microspheres with macromolecules such as gel-MA to enhance proliferation rate of injected cells and potentially enable further grafting of tissue specific molecules. Statement of Significance Poly (dl lactic-co-glycolic) acid (PdlLGA) microspheres offer limited functional groups on their surface to enable proper grafting of tissue specific bioactive molecules. To overcome this limitation, previous approaches have suggested using alkaline solutions to introduce active groups to the surface; however, they may compromise surface topography and lose any potential surface patterns. Plasma polymerisation of bioactive monomers has been suggested to enhance surface biocompatibility; however, it is not applicable on low vapour pressure macromolecules such as most extracellular matrix (ECM) proteins and growth factors. This study aims to evaluate three different approaches to modify the surface of PdlLGA microspheres with gelatine-methacrylate (gel-MA) to enable further grafting of cross-linkable biomolecules without compromising the surface topography or the biocompatibility of the system.
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Affiliation(s)
- Abdulrahman Baki
- Division of Drug Delivery and Tissue Engineering, School of Pharmacy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Cheryl V Rahman
- Division of Drug Delivery and Tissue Engineering, School of Pharmacy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Lisa J White
- Division of Drug Delivery and Tissue Engineering, School of Pharmacy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - David J Scurr
- Laboratory of Biophysics and Surface Analysis, School of Pharmacy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Omar Qutachi
- Division of Drug Delivery and Tissue Engineering, School of Pharmacy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Kevin M Shakesheff
- Division of Drug Delivery and Tissue Engineering, School of Pharmacy, University of Nottingham, University Park, Nottingham NG7 2RD, UK.
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10
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Svagan AJ, Kusic A, De Gobba C, Larsen FH, Sassene P, Zhou Q, van de Weert M, Mullertz A, Jørgensen B, Ulvskov P. Rhamnogalacturonan-I Based Microcapsules for Targeted Drug Release. PLoS One 2016; 11:e0168050. [PMID: 27992455 PMCID: PMC5167381 DOI: 10.1371/journal.pone.0168050] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Accepted: 11/23/2016] [Indexed: 01/15/2023] Open
Abstract
Drug targeting to the colon via the oral administration route for local treatment of e.g. inflammatory bowel disease and colonic cancer has several advantages such as needle-free administration and low infection risk. A new source for delivery is plant-polysaccharide based delivery platforms such as Rhamnogalacturonan-I (RG-I). In the gastro-intestinal tract the RG-I is only degraded by the action of the colonic microflora. For assessment of potential drug delivery properties, RG-I based microcapsules (~1 μm in diameter) were prepared by an interfacial poly-addition reaction. The cross-linked capsules were loaded with a fluorescent dye (model drug). The capsules showed negligible and very little in vitro release when subjected to media simulating gastric and intestinal fluids, respectively. However, upon exposure to a cocktail of commercial RG-I cleaving enzymes, ~ 9 times higher release was observed, demonstrating that the capsules can be opened by enzymatic degradation. The combined results suggest a potential platform for targeted drug delivery in the terminal gastro-intestinal tract.
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Affiliation(s)
- Anna J. Svagan
- Department of Pharmacy, University of Copenhagen, Copenhagen, Denmark
- * E-mail:
| | - Anja Kusic
- Department of Pharmacy, University of Copenhagen, Copenhagen, Denmark
| | - Cristian De Gobba
- Department of Food Science, University of Copenhagen, Copenhagen, Denmark
| | - Flemming H. Larsen
- Department of Food Science, University of Copenhagen, Copenhagen, Denmark
| | - Philip Sassene
- Department of Pharmacy, University of Copenhagen, Copenhagen, Denmark
| | - Qi Zhou
- School of Biotechnology, Royal Institute of Technology (KTH), Stockholm, Sweden
| | | | - Anette Mullertz
- Department of Pharmacy, University of Copenhagen, Copenhagen, Denmark
| | - Bodil Jørgensen
- Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Peter Ulvskov
- Department of Plant and Environmental Sciences, University of Copenhagen, Copenhagen, Denmark
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He F, Wang W, He XH, Yang XL, Li M, Xie R, Ju XJ, Liu Z, Chu LY. Controllable Multicompartmental Capsules with Distinct Cores and Shells for Synergistic Release. ACS Appl Mater Interfaces 2016; 8:8743-8754. [PMID: 26977710 DOI: 10.1021/acsami.6b01278] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A facile and flexible approach is developed for controllable fabrication of novel multiple-compartmental calcium alginate capsules from all-aqueous droplet templates with combined coextrusion minifluidic devices for isolated coencapsulation and synergistic release of diverse incompatible components. The multicompartmental capsules exhibit distinct compartments, each of which is covered by a distinct part of a heterogeneous shell. The volume and number of multiple compartments can be well-controlled by adjusting flow rates and device numbers for isolated and optimized encapsulation of different components, while the composition of different part of the heterogeneous shell can be individually tailored by changing the composition of droplet template for flexibly tuning the release behavior of each component. Two combined devices are first used to fabricate dual-compartmental capsules and then scaled up to fabricate more complex triple-compartmental capsules for coencapsulation. The synergistic release properties are demonstrated by using dual-compartmental capsules, which contain one-half shell with a constant release rate and the other half shell with a temperature-dependent release rate. Such a heterogeneous shell provides more flexibilities for synergistic release with controllable release sequence and release rates to achieve advanced and optimized synergistic efficacy. The multicompartmental capsules show high potential for applications such as drug codelivery, confined reactions, enzyme immobilizations, and cell cultures.
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Affiliation(s)
- Fan He
- School of Chemical Engineering, Sichuan University , No. 24, Southern 1 Section, Yihuan Road, Chengdu, Sichuan 610065, People's Republic of China
| | - Wei Wang
- School of Chemical Engineering, Sichuan University , No. 24, Southern 1 Section, Yihuan Road, Chengdu, Sichuan 610065, People's Republic of China
| | - Xiao-Heng He
- School of Chemical Engineering, Sichuan University , No. 24, Southern 1 Section, Yihuan Road, Chengdu, Sichuan 610065, People's Republic of China
| | - Xiu-Lan Yang
- School of Chemical Engineering, Sichuan University , No. 24, Southern 1 Section, Yihuan Road, Chengdu, Sichuan 610065, People's Republic of China
| | - Ming Li
- School of Chemical Engineering, Sichuan University , No. 24, Southern 1 Section, Yihuan Road, Chengdu, Sichuan 610065, People's Republic of China
| | - Rui Xie
- School of Chemical Engineering, Sichuan University , No. 24, Southern 1 Section, Yihuan Road, Chengdu, Sichuan 610065, People's Republic of China
| | - Xiao-Jie Ju
- School of Chemical Engineering, Sichuan University , No. 24, Southern 1 Section, Yihuan Road, Chengdu, Sichuan 610065, People's Republic of China
| | - Zhuang Liu
- School of Chemical Engineering, Sichuan University , No. 24, Southern 1 Section, Yihuan Road, Chengdu, Sichuan 610065, People's Republic of China
| | - Liang-Yin Chu
- School of Chemical Engineering, Sichuan University , No. 24, Southern 1 Section, Yihuan Road, Chengdu, Sichuan 610065, People's Republic of China
- State Key Laboratory of Polymer Materials Engineering, Sichuan University , Chengdu, Sichuan 610065, People's Republic of China
- Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing, Jiangsu 211816, People's Republic of China
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12
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Noi KF, Roozmand A, Björnmalm M, Richardson JJ, Franks GV, Caruso F. Assembly-Controlled Permeability of Layer-by-Layer Polymeric Microcapsules Using a Tapered Fluidized Bed. ACS Appl Mater Interfaces 2015; 7:27940-27947. [PMID: 26651354 DOI: 10.1021/acsami.5b10269] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Nano- and microcapsules engineered through layer-by-layer (LbL) assembly are finding an increasingly large number of applications as catalysts, electrochemical biosensors, bioreactors, artificial cells and drug delivery vehicles. While centrifugation-based LbL assembly is the most common method for coating template particles and preparing capsules, it is a batch process and requires frequent intervention that renders the system challenging to automate and scale up. Here, we report the use of a tapered fluidized bed (TFB) for the preparation of multilayered polymer capsules. This is a significant improvement over our recent approach of fluidizing particles in cylindrical fluidized beds (CFB) for LbL assembly. We demonstrate that TFB is compatible with particles <3 μm in diameter (an order-of-magnitude improvement compared with CFB), which can be fluidized with minimal entrainment. Additionally, layering materials were expanded to include both electrostatic and hydrogen-bonding polymer pairs (e.g., poly(allylamine hydrochloride) (PAH) and poly(styrenesulfonate) (PSS), and thiol-modified poly(methacrylic acid) (PMASH) and poly(N-vinylpyrrolidone) (PVPON), respectively). Finally, differences between capsules prepared via centrifugation-based and TFB LbL assembly were investigated. The obtained TFB microcapsules demonstrate increased film thickness and roughness compared with those prepared using centrifugation-based LbL assembly. Furthermore, PMASH microcapsules exhibit lower swelling and permeability when prepared via TFB LbL assembly compared with centrifugation-based LbL assembly due to enhanced multilayer deposition, entanglement, and cross-linking. Therefore, polymeric capsules fabricated via TFB LbL assembly may be useful for encapsulation and retention of relatively low molecular weight (∼20 kDa) hydrophilic biomacromolecules to passively or responsively release the payload for drug delivery applications.
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Affiliation(s)
- Ka Fung Noi
- Australian Research Council (ARC) Centre of Excellence in Convergent Bio-Nano Science and Technology, and the Department of Chemical and Biomolecular Engineering, The University of Melbourne , Parkville, Victoria 3010, Australia
| | - Ali Roozmand
- Australian Research Council (ARC) Centre of Excellence in Convergent Bio-Nano Science and Technology, and the Department of Chemical and Biomolecular Engineering, The University of Melbourne , Parkville, Victoria 3010, Australia
| | - Mattias Björnmalm
- Australian Research Council (ARC) Centre of Excellence in Convergent Bio-Nano Science and Technology, and the Department of Chemical and Biomolecular Engineering, The University of Melbourne , Parkville, Victoria 3010, Australia
| | - Joseph J Richardson
- Australian Research Council (ARC) Centre of Excellence in Convergent Bio-Nano Science and Technology, and the Department of Chemical and Biomolecular Engineering, The University of Melbourne , Parkville, Victoria 3010, Australia
| | - George V Franks
- Department of Chemical and Biomolecular Engineering, The University of Melbourne , Parkville, Victoria 3010, Australia
| | - Frank Caruso
- Australian Research Council (ARC) Centre of Excellence in Convergent Bio-Nano Science and Technology, and the Department of Chemical and Biomolecular Engineering, The University of Melbourne , Parkville, Victoria 3010, Australia
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13
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Lee WL, Guo WM, Ho VHB, Saha A, Chong HC, Tan NS, Tan EY, Loo SCJ. Delivery of doxorubicin and paclitaxel from double-layered microparticles: The effects of layer thickness and dual-drug vs. single-drug loading. Acta Biomater 2015; 27:53-65. [PMID: 26340886 DOI: 10.1016/j.actbio.2015.08.051] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [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: 04/18/2015] [Revised: 08/14/2015] [Accepted: 08/31/2015] [Indexed: 12/23/2022]
Abstract
Double-layered microparticles composed of poly(d,l-lactic-co-glycolic acid, 50:50) (PLGA) and poly(l-lactic acid) (PLLA) were loaded with doxorubicin HCl (DOX) and paclitaxel (PCTX) through a solvent evaporation technique. DOX was localized in the PLGA shell, while PCTX was localized in the PLLA core. The aim of this study was to investigate how altering layer thickness of dual-drug, double-layered microparticles can influence drug release kinetics and their antitumor capabilities, and against single-drug microparticles. PCTX-loaded double-layered microparticles with denser shells retarded the initial release of PCTX, as compared with dual-drug-loaded microparticles. The DOX release from both DOX-loaded and dual-drug-loaded microparticles were observed to be similar with an initial burst. Through specific tailoring of layer thicknesses, a suppressed initial burst of DOX and a sustained co-delivery of two drugs can be achieved over 2months. Viability studies using spheroids of MCF-7 cells showed that controlled co-delivery of PCTX and DOX from dual-drug-loaded double-layered microparticles were better in reducing spheroid growth rate. This study provides mechanistic insights into how by tuning the layer thickness of double-layered microparticles the release kinetics of two drugs can be controlled, and how co-delivery can potentially achieve better anticancer effects. STATEMENT OF SIGNIFICANCE While the release of multiple drugs has been reported to achieve successful apoptosis and minimize drug resistance, most conventional particulate systems can only deliver a single drug at a time. Recently, although a number of formulations (e.g. micellar nanoparticles, liposomes) have been successful in delivering two or more anticancer agents, sustained co-delivery of these agents remains inadequate due to the complex agent loading processes and rapid release of hydrophilic agents. Therefore, the present work reports the multilayered particulate system that simultaneously hosts different drugs, while being able to tune their individual release over months. We believe that our findings would be of interest to the readers of Acta Biomaterialia because the proposed system could open a new avenue on how two drugs can be released, through rate-controlling carriers, for combination chemotherapy.
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Affiliation(s)
- Wei Li Lee
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Wei Mei Guo
- Molecular Engineering Laboratory, A(∗)STAR, Proteos #03-13, 61 Biopolis Drive, Singapore 138673, Singapore
| | - Vincent H B Ho
- Molecular Engineering Laboratory, A(∗)STAR, Proteos #03-13, 61 Biopolis Drive, Singapore 138673, Singapore
| | - Amitaksha Saha
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Han Chung Chong
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore
| | - Nguan Soon Tan
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore; Institute of Molecular and Cell Biology, A(∗)STAR, 61 Biopolis Drive, Proteos, Singapore 138673, Singapore
| | - Ern Yu Tan
- Department of General Surgery, Tan Tock Seng Hospital, 11 Jalan Tan Tock Seng, Singapore 308433, Singapore
| | - Say Chye Joachim Loo
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore; Singapore Centre on Environmental Life Sciences Engineering (SCELSE), Nanyang Technological University, Singapore 637551, Singapore.
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14
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Liao WC, Lu CH, Hartmann R, Wang F, Sohn YS, Parak WJ, Willner I. Adenosine Triphosphate-Triggered Release of Macromolecular and Nanoparticle Loads from Aptamer/DNA-Cross-Linked Microcapsules. ACS Nano 2015; 9:9078-9086. [PMID: 26266334 DOI: 10.1021/acsnano.5b03223] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The synthesis of stimuli-responsive DNA microcapsules acting as carriers for different payloads, and being dissociated through the formation of aptamer-ligand complexes is described. Specifically, stimuli-responsive anti-adenosine triphosphate (ATP) aptamer-cross-linked DNA-stabilized microcapsules loaded with tetramethylrhodamine-modified dextran (TMR-D), CdSe/ZnS quantum dots (QDs), or microperoxidase-11 (MP-11) are presented. In the presence of ATP as trigger, the microcapsules are dissociated through the formation of aptamer-ATP complexes, resulting in the release of the respective loads. Selective unlocking of the capsules is demonstrated, and CTP, GTP, or TTP do not unlock the pores. The ATP-triggered release of MP-11 from the microcapsules enables the MP-11-catalyzed oxidation of Amplex UltraRed by H2O2 to the fluorescent product resorufin.
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Affiliation(s)
- Wei-Ching Liao
- Institute of Chemistry, Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem , Jerusalem 91904, Israel
| | - Chun-Hua Lu
- Institute of Chemistry, Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem , Jerusalem 91904, Israel
| | - Raimo Hartmann
- Fachbereich Physik, Philipps-Universität Marburg , Renthof 7, 35037 Marburg, Germany
| | - Fuan Wang
- Institute of Chemistry, Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem , Jerusalem 91904, Israel
| | - Yang Sung Sohn
- Institute of Life Science, The Hebrew University of Jerusalem , Jerusalem 91904, Israel
| | - Wolfgang J Parak
- Fachbereich Physik, Philipps-Universität Marburg , Renthof 7, 35037 Marburg, Germany
| | - Itamar Willner
- Institute of Chemistry, Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem , Jerusalem 91904, Israel
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15
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Abstract
We report a simple approach to fabricate custom-shape microcapsules using hydrogel templates synthesized by stop flow lithography. Cargo-containing microcapsules were made by coating hydrogel particles with a single layer of poly-l-lysine followed by a one-step core degradation and capsule cross-linking procedure. We determined appropriate coating conditions by investigating the effect of pH, ionic strength, and prepolymer composition on the diffusion of polyelectrolytes into the oppositely charged hydrogel template. We also characterized the degradation of the templating core by tracking the diffusivity of nanoparticles embedded within the hydrogel. Unlike any other technique, this approach allows for easy fabrication of microcapsules with internal features (e.g., toroids) and selective surface modification of Janus particles using any polyelectrolyte. These soft, flexible capsules may be useful for therapeutic applications as well as fundamental studies of membrane mechanics.
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Affiliation(s)
- Lynna Chen
- Department of Biological Engineering and ‡Department of Chemical Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Harry Z An
- Department of Biological Engineering and ‡Department of Chemical Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Patrick S Doyle
- Department of Biological Engineering and ‡Department of Chemical Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
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16
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Leong JY, Tey BT, Tan CP, Chan ES. Nozzleless Fabrication of Oil-Core Biopolymeric Microcapsules by the Interfacial Gelation of Pickering Emulsion Templates. ACS Appl Mater Interfaces 2015; 7:16169-16176. [PMID: 26148344 DOI: 10.1021/acsami.5b04486] [Citation(s) in RCA: 16] [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] [Indexed: 06/04/2023]
Abstract
Ionotropic gelation has been an attractive method for the fabrication of biopolymeric oil-core microcapsules due to its safe and mild processing conditions. However, the mandatory use of a nozzle system to form the microcapsules restricts the process scalability and the production of small microcapsules (<100 μm). We report, for the first time, a nozzleless and surfactant-free approach to fabricate oil-core biopolymeric microcapsules through ionotropic gelation at the interface of an O/W Pickering emulsion. This approach involves the self-assembly of calcium carbonate (CaCO3) nanoparticles at the interface of O/W emulsion droplets followed by the addition of a polyanionic biopolymer into the aqueous phase. Subsequently, CaCO3 nanoparticles are dissolved by pH reduction, thus liberating Ca(2+) ions to cross-link the surrounding polyanionic biopolymer to form a shell that encapsulates the oil droplet. We demonstrate the versatility of this method by fabricating microcapsules from different types of polyanionic biopolymers (i.e., alginate, pectin, and gellan gum) and water-immiscible liquid cores (i.e., palm olein, cyclohexane, dichloromethane, and toluene). In addition, small microcapsules with a mean size smaller than 100 μm can be produced by selecting the appropriate conventional emulsification methods available to prepare the Pickering emulsion. The simplicity and versatility of this method allows biopolymeric microcapsules to be fabricated with ease by ionotropic gelation for numerous applications.
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Affiliation(s)
| | | | - Chin-Ping Tan
- §Department of Food Technology, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 Serdang, Selangor Malaysia
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17
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Minardi S, Pandolfi L, Taraballi F, De Rosa E, Yazdi IK, Liu X, Ferrari M, Tasciotti E. PLGA-Mesoporous Silicon Microspheres for the in Vivo Controlled Temporospatial Delivery of Proteins. ACS Appl Mater Interfaces 2015; 7:16364-16373. [PMID: 26108253 DOI: 10.1021/acsami.5b03464] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In regenerative medicine, the temporospatially controlled delivery of growth factors (GFs) is crucial to trigger the desired healing mechanisms in the target tissues. The uncontrolled release of GFs has been demonstrated to cause severe side effects in the surrounding tissues. The aim of this study was to optimize a translational approach for the fine temporal and spatial control over the release of proteins, in vivo. Hence, we proposed a newly developed multiscale composite microsphere based on a core consisting of the nanostructured silicon multistage vector (MSV) and a poly(dl-lactide-co-glycolide) acid (PLGA) outer shell. Both of the two components of the resulting composite microspheres (PLGA-MSV) can be independently tailored to achieve multiple release kinetics contributing to the control of the release profile of a reporter protein in vitro. The influence of MSV shape (hemispherical or discoidal) and size (1, 3, or 7 μm) on PLGA-MSV's morphology and size distribution was investigated. Second, the copolymer ratio of the PLGA used to fabricate the outer shell of PLGA-MSV was varied. The composites were fully characterized by optical microscopy, scanning electron microscopy, ζ potential, Fourier transform infrared spectroscopy, and thermogravimetric analysis-differential scanning calorimetry, and their release kinetics over 30 days. PLGA-MSV's biocompatibility was assessed in vitro with J774 macrophages. Finally, the formulation of PLGA-MSV was selected, which concurrently provided the most consistent microsphere size and allowed for a zero-order release kinetic. The selected PLGA-MSVs were injected in a subcutaneous model in mice, and the in vivo release of the reporter protein was followed over 2 weeks by intravital microscopy, to assess if the zero-order release was preserved. PLGA-MSV was able to retain the payload over 2 weeks, avoiding the initial burst release typical of most drug delivery systems. Finally, histological evaluation assessed the biocompatibility of the platform in vivo.
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Affiliation(s)
- Silvia Minardi
- †Department of Nanomedicine, Houston Methodist Research Institute, 6670 Bertner Avenue, Houston, Texas 77030, United States
- ‡Institute of Science and Technology for Ceramics, National Research Council of Italy, Via Granarolo 64, 48018 Faenza, Ravenna, Italy
| | - Laura Pandolfi
- †Department of Nanomedicine, Houston Methodist Research Institute, 6670 Bertner Avenue, Houston, Texas 77030, United States
- §College of Materials Science and Engineering, University of Chinese Academy of Science, 19A Yuquanlu, Beijing 100049, China
| | - Francesca Taraballi
- †Department of Nanomedicine, Houston Methodist Research Institute, 6670 Bertner Avenue, Houston, Texas 77030, United States
| | - Enrica De Rosa
- †Department of Nanomedicine, Houston Methodist Research Institute, 6670 Bertner Avenue, Houston, Texas 77030, United States
| | - Iman K Yazdi
- †Department of Nanomedicine, Houston Methodist Research Institute, 6670 Bertner Avenue, Houston, Texas 77030, United States
| | - Xeuwu Liu
- †Department of Nanomedicine, Houston Methodist Research Institute, 6670 Bertner Avenue, Houston, Texas 77030, United States
| | - Mauro Ferrari
- †Department of Nanomedicine, Houston Methodist Research Institute, 6670 Bertner Avenue, Houston, Texas 77030, United States
| | - Ennio Tasciotti
- †Department of Nanomedicine, Houston Methodist Research Institute, 6670 Bertner Avenue, Houston, Texas 77030, United States
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18
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Song Y, Chan YK, Ma Q, Liu Z, Shum HC. All-Aqueous Electrosprayed Emulsion for Templated Fabrication of Cytocompatible Microcapsules. ACS Appl Mater Interfaces 2015; 7:13925-33. [PMID: 26053733 DOI: 10.1021/acsami.5b02708] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Encapsulation of biomolecules and cells in hydrogel capsules via emulsion templating frequently induces an irreversible loss of bioactivity, because of the use of nonaqueous solvents. Here, we introduce an all-aqueous electrospray (AAE) approach to generate aqueous two-phase emulsion droplets, and we use them as templates to fabricate microcapsules with preserved cell viability. The approach allows formation of monodisperse microparticles with tunable sizes, variable compositions, and interior architectures in a mild gelation process. This technique potentially benefits a variety of new biomedical applications, such as delivery of bioactive proteins, transplantation of living cells, and assembly of cell-mimicking structures.
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Affiliation(s)
- Yang Song
- ‡HKU-Shenzhen Institute of Research and Innovation (HKU-SIRI), Guangdong 518000, China
- †Department of Mechanical Engineering, University of Hong Kong, Hong Kong
| | - Yau Kei Chan
- †Department of Mechanical Engineering, University of Hong Kong, Hong Kong
- §Department of Ophthalmology, University of Hong Kong, Hong Kong
| | - Qingming Ma
- ‡HKU-Shenzhen Institute of Research and Innovation (HKU-SIRI), Guangdong 518000, China
- †Department of Mechanical Engineering, University of Hong Kong, Hong Kong
| | - Zhou Liu
- ‡HKU-Shenzhen Institute of Research and Innovation (HKU-SIRI), Guangdong 518000, China
- †Department of Mechanical Engineering, University of Hong Kong, Hong Kong
| | - Ho Cheung Shum
- ‡HKU-Shenzhen Institute of Research and Innovation (HKU-SIRI), Guangdong 518000, China
- †Department of Mechanical Engineering, University of Hong Kong, Hong Kong
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Yang C, Wu H, Yang X, Shi J, Wang X, Zhang S, Jiang Z. Coordination-Enabled One-Step Assembly of Ultrathin, Hybrid Microcapsules with Weak pH-Response. ACS Appl Mater Interfaces 2015; 7:9178-9184. [PMID: 25897477 DOI: 10.1021/acsami.5b01463] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this study, an ultrathin, hybrid microcapsule is prepared though coordination-enabled one-step assembly of tannic acid (TA) and titanium(IV) bis(ammonium lactate) dihydroxide (Ti-BALDH) upon a hard-templating method. Briefly, the PSS-doped CaCO3 microspheres with a diameter of 5-8 μm were synthesized and utilized as the sacrificial templates. Then, TA-Ti(IV) coatings were formed on the surface of the PSS-doped CaCO3 templates through soaking in TA and Ti-BALDH aqueous solutions under mild conditions. After removing the template by EDTA treatment, the TA-Ti(IV) microcapsules with a capsule wall thickness of 15 ± 3 nm were obtained. The strong coordination bond between polyphenol and Ti(IV) conferred the TA-Ti(IV) microcapsules high structural stability in the range of pH values 3.0-11.0. Accordingly, the enzyme-immobilized TA-Ti(IV) microcapsules exhibited superior pH and thermal stabilities. This study discloses the formation of TA-Ti(IV) microcapsules that are suitable for use as supports in catalysis due to their extensive pH and thermal stabilities.
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Affiliation(s)
- Chen Yang
- §Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Hong Wu
- §Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Xiao Yang
- §Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Jiafu Shi
- §Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Xiaoli Wang
- §Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Shaohua Zhang
- §Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Zhongyi Jiang
- §Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
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20
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Lemma SM, Scampicchio M, Mahon PJ, Sbarski I, Wang J, Kingshott P. Controlled release of retinyl acetate from β-cyclodextrin functionalized poly(vinyl alcohol) electrospun nanofibers. J Agric Food Chem 2015; 63:3481-3488. [PMID: 25779354 DOI: 10.1021/acs.jafc.5b00103] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Retinyl acetate (RA) was effectively incorporated into electrospun nanofibers of poly(vinyl alcohol) (PVA) containing β-cyclodextrin (β-CD) in order to form inclusion complexes for encapsulation to prolong shelf life and thermal stability. The physical and thermal properties of encapsulated RA were determined by scanning electron microscopy (SEM), X-ray diffraction (XRD), and differential scanning calorimetry (DSC). The nanofibers of PVA/RA and PVA/RA/β-CD exhibited bead free average fiber diameters of 264 ± 61 and 223 ± 49 nm, respectively. The surface chemistry of the functional nanofibers was investigated by X-ray photoelectron spectroscopy (XPS). Thermogravimetric analysis (TGA) demonstrated different thermal stabilities between the bioactive and the polymer, with and without β-CD. Square-wave voltammogram peak current changes were used to follow the release kinetics of RA from the nanofibers. Results indicate that RA coated inside PVA/β-CD nanofibers was protected against oxidation much better than RA in PVA nanofibers and should extend the shelf life. In addition, RA encapsulated in the PVA/β-CD had better thermal stability than PVA nanofibers.
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Affiliation(s)
- Solomon M Lemma
- †Faculty of Science and Technology, Free University of Bolzano, Piazza Università 5, 39100 Bolzano, Italy
- ‡Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
- ∥Industrial Research Institute Swinburne (IRIS), Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Matteo Scampicchio
- †Faculty of Science and Technology, Free University of Bolzano, Piazza Università 5, 39100 Bolzano, Italy
| | - Peter J Mahon
- ‡Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Igor Sbarski
- §Department of Mechanical and Product Design Engineering, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - James Wang
- §Department of Mechanical and Product Design Engineering, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
- ∥Industrial Research Institute Swinburne (IRIS), Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Peter Kingshott
- †Faculty of Science and Technology, Free University of Bolzano, Piazza Università 5, 39100 Bolzano, Italy
- §Department of Mechanical and Product Design Engineering, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
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21
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Soriano-Souza CA, Rossi AL, Mavropoulos E, Hausen MA, Tanaka MN, Calasans-Maia MD, Granjeiro JM, Rocha-Leão MHM, Rossi AM. Chlorhexidine-loaded hydroxyapatite microspheres as an antimicrobial delivery system and its effect on in vivo osteo-conductive properties. J Mater Sci Mater Med 2015; 26:166. [PMID: 25791461 DOI: 10.1007/s10856-015-5505-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Accepted: 02/09/2015] [Indexed: 06/04/2023]
Abstract
Hydroxyapatite (HA) has been investigated as a delivery system for antimicrobial and antibacterial agents to simultaneously stimulate bone regeneration and prevent infection. Despite evidence supporting the bactericidal efficiency of these HA carriers, few studies have focused on the effect of this association on bone regeneration. In this work, we evaluated the physico-chemical properties of hydroxyapatite microspheres loaded with chlorhexidine (CHX) at two different concentrations, 0.9 and 9.1 μgCHX/cm2 HA, and characterized their effects on in vitro osteoblast viability and bone regeneration. Ultraviolet-visible spectroscopy, scanning and transmission electron microscopy associated with energy-dispersive X-ray spectroscopy and electron energy loss spectroscopy were used to characterize the association of CHX and HA nanoparticles. The high CHX loading dose induced formation of organic CHX plate-like aggregates on the HA surface, whereas a Langmuir film was formed at the low CHX surface concentration. Quantitative evaluation of murine osteoblast viability parameters, including adhesion, mitochondrial activity and membrane integrity of cells exposed to HA/CHX extracts, revealed a cytotoxic effect for both loading concentrations. Histomorphological analysis upon implantation into the dorsal connective tissues and calvaria of rats for 7 and 42 days showed that the high CHX concentration induced the infiltration of inflammatory cells, resulting in retarded bone growth. Despite a strong decrease in in vitro cell viability, the low CHX loading dose did not impair the biocompatibility and osteoconductivity of HA during bone repair. These results indicate that high antimicrobial doses may activate a strong local inflammatory response and disrupt the long-term osteoconductive properties of CHX-HA delivery systems.
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Affiliation(s)
- Carlos Alberto Soriano-Souza
- Department of Applied Physics, Brazilian Center for Physics Research, Rua Dr. Xavier Sigaud, 150, Lab 203, Urca, 22290-180, Rio de Janeiro, RJ, Brazil,
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22
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Sargın İ, Kaya M, Arslan G, Baran T, Ceter T. Preparation and characterisation of biodegradable pollen-chitosan microcapsules and its application in heavy metal removal. Bioresour Technol 2015; 177:1-7. [PMID: 25479387 DOI: 10.1016/j.biortech.2014.11.067] [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] [Subscribe] [Scholar Register] [Received: 08/31/2014] [Revised: 11/14/2014] [Accepted: 11/15/2014] [Indexed: 06/04/2023]
Abstract
Biosorbents have been widely used in heavy metal removal. New resources should be exploited to develop more efficient biosorbents. This study reports the preparation of three novel chitosan microcapsules from pollens of three common, wind-pollinated plants (Acer negundo, Cupressus sempervirens and Populus nigra). The microcapsules were characterized (Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy and elemental analysis) and used in removal of heavy metal ions: Cd(II), Cr(III), Cu(II), Ni(II) and Zn(II). Their sorption capacities were compared to those of cross-linked chitosan beads without pollen grains. C. sempervirens-chitosan microcapsules exhibited better performance (Cd(II): 65.98; Cu(II): 67.10 and Zn(II): 49.55 mg g(-1)) than the other microcapsules and the cross-linked beads. A. negundo-chitosan microcapsules were more efficient in Cr(III) (70.40 mg g(-1)) removal. P. nigra-chitosan microcapsules were found to be less efficient. Chitosan-pollen microcapsules (except P. nigra-chitosan microcapsules) can be used in heavy metal removal.
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Affiliation(s)
- İdris Sargın
- Selcuk University, Faculty of Science, Department of Chemistry, 42075 Konya, Turkey.
| | - Murat Kaya
- Aksaray University, Faculty of Science and Letters, Department of Biotechnology and Molecular Biology, 68100 Aksaray, Turkey
| | - Gulsin Arslan
- Selcuk University, Faculty of Science, Department of Biochemistry, 42075 Konya, Turkey
| | - Talat Baran
- Aksaray University, Faculty of Science, Department of Chemistry, 68100 Aksaray, Turkey
| | - Talip Ceter
- Department of Biology, Faculty of Arts and Sciences, Kastamonu University, 37100 Kastamonu, Turkey
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23
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Bohr A, Wan F, Kristensen J, Dyas M, Stride E, Baldursdottír S, Edirisinghe M, Yang M. Pharmaceutical microparticle engineering with electrospraying: the role of mixed solvent systems in particle formation and characteristics. J Mater Sci Mater Med 2015; 26:61. [PMID: 25631263 DOI: 10.1007/s10856-015-5379-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Accepted: 09/15/2014] [Indexed: 06/04/2023]
Abstract
Microparticles of Celecoxib, dispersed in a matrix of poly(lactic-co-glycolic acid) (PLGA), were prepared by electrospraying using different solvent mixtures to investigate the influence upon particle formation and the resulting particle characteristics. Mixtures consisting of a good solvent, acetone, and an anti-solvent, methanol, for PLGA were studied in different ratios. Properties of the spraying solutions were examined and the resulting microparticles were characterized with regard to size, morphology, porosity, solid state form, surface chemistry and drug release. Particle formation was strongly influenced by the polymer molecular conformation during droplet formation and by the anti-solvent concentration during droplet drying. A strong correlation was found between particle morphology and the solubility of the polymer in the solvent mixtures. The lack of chain entanglements in droplets containing anti-solvent resulted in compact polymer conformation and grain-like particle morphology. Further, the early precipitation of polymer and low chain interaction with increasing content of anti-solvent resulted in surface enrichment of drug (from 10 and 20% up to 41 and 57% respectively), also demonstrated by the increasingly higher drug release rates. The results demonstrate the importance of solvent composition in particle preparation and indicate potential for exploiting this dependence to improve pharmaceutical particle design and performance.
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Affiliation(s)
- Adam Bohr
- Department of Pharmacy, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark,
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24
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Li Z, Zhang C, Wang B, Wang H, Chen X, Möhwald H, Cui X. Sonochemical fabrication of dual-targeted redox-responsive smart microcarriers. ACS Appl Mater Interfaces 2014; 6:22166-22173. [PMID: 25478992 DOI: 10.1021/am5057097] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In the present study, the molecular and magnetic dual-targeted redox-responsive folic acid-cysteine-Fe3O4 microcapsules (FA-Cys-Fe3O4 MCs) have been synthesized via the sonochemical technique, and targeting molecule (folic acid) and Fe3O4 magnetic nanoparticles are introduced into the microcapsule shells successfully. The obtained FA-Cys-Fe3O4 MCs show excellent magnetic responsive ability by the oriented motion under an external magnetic field. The hydrophobic fluorescent dye (Coumarin 6) is successfully loaded into the FA-Cys-Fe3O4 MCs, demonstrating that it could be also easily realized to encapsulate hydrophobic drugs into the FA-Cys-Fe3O4 MCs when the drugs are dispersed into the oil phase before sonication. Cellular uptake demonstrates that FA-Cys-Fe3O4 MCs could target selectively the cells via folate-receptor-mediated endocytosis. Moreover, the FA-Cys-Fe3O4 MCs show their potential ability to be an attractive carrier for drug controlled release owing to the redox responsiveness of the disulfide in the microcapsule shells.
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Affiliation(s)
- Zhanfeng Li
- College of Chemistry, Jilin University , Changchun, 130012, P. R. China
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25
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Kaufman G, Boltyanskiy R, Nejati S, Thiam AR, Loewenberg M, Dufresne ER, Osuji CO. Single-step microfluidic fabrication of soft monodisperse polyelectrolyte microcapsules by interfacial complexation. Lab Chip 2014; 14:3494-7. [PMID: 25025528 DOI: 10.1039/c4lc00482e] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Common methods for fabrication of polyelectrolyte microcapsules rely on a multi-step process. We propose a single-step approach to generate polyelectrolyte microcapsules with 1-2 μm shells based on polyelectrolyte complexation across a water/oil droplet interface and study the effect of parameters controlling the polyelectrolyte complexation on shell thickness.
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Affiliation(s)
- Gilad Kaufman
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut, USA.
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26
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Qian D, Bai B, Yan G, Zhang S, Liu Q, Chen Y, Tan X, Zeng Y. Construction of doxycycline-mediated BMP-2 transgene combining with APA microcapsules for bone repair. Artificial Cells, Nanomedicine, and Biotechnology 2014; 44:270-6. [PMID: 25092431 DOI: 10.3109/21691401.2014.942458] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Dongyang Qian
- a Department of Orthopaedics , the First Affiliated Hospital, Guangzhou Medical University , Guangzhou , P. R. China
| | - Bo Bai
- a Department of Orthopaedics , the First Affiliated Hospital, Guangzhou Medical University , Guangzhou , P. R. China
| | - Guangbin Yan
- a Department of Orthopaedics , the First Affiliated Hospital, Guangzhou Medical University , Guangzhou , P. R. China
| | - Shujiang Zhang
- a Department of Orthopaedics , the First Affiliated Hospital, Guangzhou Medical University , Guangzhou , P. R. China
| | - Qi Liu
- a Department of Orthopaedics , the First Affiliated Hospital, Guangzhou Medical University , Guangzhou , P. R. China
| | - Yi Chen
- a Department of Orthopaedics , the First Affiliated Hospital, Guangzhou Medical University , Guangzhou , P. R. China
| | - Xiaobo Tan
- a Department of Orthopaedics , the First Affiliated Hospital, Guangzhou Medical University , Guangzhou , P. R. China
| | - Yanjun Zeng
- b Biomechanics & Medical Information Institute, Beijing University of Technology , Beijing , P. R. China
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27
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Lu XF, Shi YF, Lv HL, Fu YY, Ma D, Xue W. Preparation and characterization of molecularly imprinted poly(hydroxyethyl methacrylate) microspheres for sustained release of gatifloxacin. J Mater Sci Mater Med 2014; 25:1461-1469. [PMID: 24652594 DOI: 10.1007/s10856-014-5191-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Accepted: 03/08/2014] [Indexed: 06/03/2023]
Abstract
Molecularly imprinted poly(hydroxyethyl methacrylate) microspheres (PHEMA MIPMs) were prepared via precipitation polymerization in this article, using gatifloxacin (GFLX), hydroxyethyl methacrylate (HEMA), and ethylene glycol dimethacrylate (EGDMA) as template molecule, functional monomer and cross-linker, respectively. The effects of reaction medium, initial total monomers, cross-linker and molecular imprinting on the polymerization were investigated systematically. The interaction between GFLX and HEMA in pre-solution was studied by UV-Visible spectrophotometer, both size and morphology of products were characterized by a scanning electron microscope. When the total initial monomer concentration was 1 vol%, EGDMA content was 70 mol%, a group of uniform PHEMA MIPMs were prepared at different GFLX/MAA molar ratios, with diameter range from 2.06 ± 0.07 to 2.82 ± 0.20 μm. The results of drug loading and in vitro release experiments demonstrated that PHEMA MIPMs could achieve a higher GFLX loading content and a more acceptable sustained release than non-imprinted ones.
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Affiliation(s)
- Xue-Fei Lu
- Institute of Biomedical Engineering, Jinan University, Guangzhou, 510632, People's Republic of China
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28
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Zabow G, Dodd SJ, Koretsky AP. Ellipsoidal microcavities: electromagnetic properties, fabrication, and use as multispectral MRI agents. Small 2014; 10:1902-7. [PMID: 24623519 PMCID: PMC4112950 DOI: 10.1002/smll.201303045] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Revised: 12/24/2013] [Indexed: 05/04/2023]
Affiliation(s)
- Gary Zabow
- Laboratory of Functional and Molecular Imaging, NINDS, National Institutes of Health, Bethesda, MD 20892, USA. Electromagnetics Division, Physical Measurement Laboratory, National Institute of Standards and Technology, Boulder, CO 80305, USA
| | - Stephen J. Dodd
- Laboratory of Functional and Molecular Imaging, NINDS, National Institutes of Health, Bethesda, MD 20892, USA
| | - Alan P. Koretsky
- Laboratory of Functional and Molecular Imaging, NINDS, National Institutes of Health, Bethesda, MD 20892, USA
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29
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Wassmer S, Rafat M, Fong WG, Baker AN, Tsilfidis C. Chitosan microparticles for delivery of proteins to the retina. Acta Biomater 2013; 9:7855-64. [PMID: 23623991 DOI: 10.1016/j.actbio.2013.04.025] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Revised: 03/27/2013] [Accepted: 04/15/2013] [Indexed: 11/29/2022]
Abstract
Chitosan microparticles (CMPs) have previously been developed for topical applications to the eye, but their safety and efficacy in delivering proteins to the retina have not been adequately evaluated. This study examines the release kinetics of CMPs in vitro, and assesses their biocompatibility and cytotoxicity on retinal cells in vitro and in vivo. Two proteins were used in the encapsulation and release studies: BSA (bovine serum albumin) and tat-EGFP (enhanced green fluorescent protein fused to the transactivator of transcription peptide). Not surprisingly, the in vitro release kinetics were dependent on the protein encapsulated, with BSA showing higher release than tat-EGFP. CMPs containing encapsulated tat-EGFP were tested for cellular toxicity in photoreceptor-derived 661W cells. They showed no signs of in vitro cell toxicity at a low concentration (up to 1mgml(-1)), but at a higher concentration of 10mgml(-1) they were associated with cytotoxic effects. In vivo, CMPs injected into the subretinal space were found beneath the photoreceptor layer of the retina, and persisted for at least 8weeks. Similar to the in vitro studies, the lower concentration of CMPs was generally well tolerated, but the higher concentration resulted in cytotoxic effects and in reduced retinal function, as assessed by electroretinogram amplitudes. Overall, this study suggests that CMPs are effective long-term delivery agents to the retina, but the concentration of chitosan may affect cytotoxicity.
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Affiliation(s)
- Sarah Wassmer
- Ottawa Hospital Research Institute, Vision Sciences Program, Box 307, 501 Smyth Road, Ottawa, ON, Canada K1H 8L6
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30
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Huo J, Marcello M, Garai A, Bradshaw D. MOF-polymer composite microcapsules derived from Pickering emulsions. Adv Mater 2013; 25:2717-22. [PMID: 23554180 DOI: 10.1002/adma.201204913] [Citation(s) in RCA: 107] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Revised: 02/13/2013] [Indexed: 05/21/2023]
Abstract
Hollow composite microcapsules are prepared by the assembly of pre-formed nanocrystals of metal-organic frameworks (MOFs) around emulsion droplets, followed by interfacial polymerisation of the interior. The micropores of the MOF crystals embedded within a semipermeable hierarchically structured polymeric membrane are an effective combination for the retention of encapsulated dye molecules. Release can be triggered however by acid dissolution of the MOF component.
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Affiliation(s)
- Jia Huo
- School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, UK.
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31
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Ma M, Chiu A, Sahay G, Doloff JC, Dholakia N, Thakrar R, Cohen J, Vegas A, Chen D, Bratlie KM, Dang T, York RL, Hollister-Lock J, Weir GC, Anderson DG. Core-shell hydrogel microcapsules for improved islets encapsulation. Adv Healthc Mater 2013; 2:667-72. [PMID: 23208618 PMCID: PMC3814167 DOI: 10.1002/adhm.201200341] [Citation(s) in RCA: 131] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Indexed: 12/22/2022]
Abstract
Islets microencapsulation holds great promise to treat type 1 diabetes. Currently used alginate microcapsules often have islets protruding outside capsules, leading to inadequate immuno-protection. A novel design of microcapsules with core-shell structures using a two-fluid co-axial electro-jetting is reported. Improved encapsulation and diabetes correction is achieved in a single step by simply confining the islets in the core region of the capsules.
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Affiliation(s)
- Minglin Ma
- David H Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Department of Anesthesiology, Children Hospital Boston, 300 Longwood Ave, Boston, MA 02115, USA
| | - Alan Chiu
- David H Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Department of Anesthesiology, Children Hospital Boston, 300 Longwood Ave, Boston, MA 02115, USA
| | - Gaurav Sahay
- David H Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Joshua C. Doloff
- David H Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Department of Anesthesiology, Children Hospital Boston, 300 Longwood Ave, Boston, MA 02115, USA
| | - Nimit Dholakia
- David H Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Department of Anesthesiology, Children Hospital Boston, 300 Longwood Ave, Boston, MA 02115, USA
| | - Raj Thakrar
- David H Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Department of Anesthesiology, Children Hospital Boston, 300 Longwood Ave, Boston, MA 02115, USA
| | - Joshua Cohen
- Section on Islet Cell and Regenerative Biology, Research Division, Joslin Diabetes Center, One Joslin Place, Boston, MA 02215, USA
| | - Arturo Vegas
- David H Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Department of Anesthesiology, Children Hospital Boston, 300 Longwood Ave, Boston, MA 02115, USA
| | - Delai Chen
- David H Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Department of Anesthesiology, Children Hospital Boston, 300 Longwood Ave, Boston, MA 02115, USA
| | - Kaitlin M. Bratlie
- Departments of Materials Science & Engineering and Chemical & Biological Engineering, Iowa State University, Ames, IA, 50011
| | - Tram Dang
- David H Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Department of Anesthesiology, Children Hospital Boston, 300 Longwood Ave, Boston, MA 02115, USA
| | - Roger L. York
- David H Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Department of Anesthesiology, Children Hospital Boston, 300 Longwood Ave, Boston, MA 02115, USA
| | - Jennifer Hollister-Lock
- Section on Islet Cell and Regenerative Biology, Research Division, Joslin Diabetes Center, One Joslin Place, Boston, MA 02215, USA
| | - Gordon C. Weir
- Section on Islet Cell and Regenerative Biology, Research Division, Joslin Diabetes Center, One Joslin Place, Boston, MA 02215, USA
| | - Daniel G. Anderson
- David H Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Division of Health Science Technology, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Department of Anesthesiology, Children Hospital Boston, 300 Longwood Ave, Boston, MA 02115, USA
- Section on Islet Cell and Regenerative Biology, Research Division, Joslin Diabetes Center, One Joslin Place, Boston, MA 02215, USA
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Samie M, Salari A, Shafii MB. Breakup of microdroplets in asymmetric T junctions. Phys Rev E Stat Nonlin Soft Matter Phys 2013; 87:053003. [PMID: 23767616 DOI: 10.1103/physreve.87.053003] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Revised: 04/04/2013] [Indexed: 05/11/2023]
Abstract
Symmetric T junctions have been used widely in microfluidics to generate equal-sized microdroplets, which are applicable in drug delivery systems. A newly proposed method for generating unequal-sized microdroplets at a T junction is investigated theoretically and experimentally. Asymmetric T junctions with branches of identical lengths and different cross sections are utilized for this aim. An equation for the critical breakup of droplets at asymmetric T junctions and one for determining the breakup point of droplets are developed. A good agreement was observed between the theories (present and previous) and the experiments.
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Affiliation(s)
- Milad Samie
- Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran
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33
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Bogdanowicz KA, Tylkowski B, Giamberini M. Preparation and characterization of light-sensitive microcapsules based on a liquid crystalline polyester. Langmuir 2013; 29:1601-1608. [PMID: 23245267 DOI: 10.1021/la3038878] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Photosensitive microcapsules and membranes based on poly(α-methylstilbenesebacoate-co-α-methylstilbeneisophthalate), containing the photosensitive α-methylstilbene moiety, were prepared by a phase-inversion precipitation process. In order to simulate the morphology and behavior of the microcapsule shell under UV irradiation, an exhaustive characterization of a membrane was first performed by ESEM, POM, AFM, and contact angle measurements. The prepared microcapsules contained either chloroform or a concentrated solution of vanillin in chloroform as the core; in all cases, before UV irradiation, their outer surface appeared smooth and dense. The influence of vanillin on microcapsule cross-section morphology was observed by ESEM microscopy. Release of vanillin in water, at room temperature, was markedly influenced by UV irradiation: in the absence of irradiation, it was practically negligible, while when microcapsules were submitted to continuous irradiation with UV light, the surface morphology of the capsules changed drastically and vanillin started to be released after ca. 20 min of irradiation.
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Affiliation(s)
- Krzysztof Artur Bogdanowicz
- Universitat Rovira i Virgili, Departament de Enginyeria Química, Av. Països Catalans, 26-43007, Tarragona, Spain
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Gu J, Liu J, Li Y, Zhao W, Shi J. One-pot synthesis of mesoporous silica nanocarriers with tunable particle sizes and pendent carboxylic groups for cisplatin delivery. Langmuir 2013; 29:403-410. [PMID: 23214476 DOI: 10.1021/la3036264] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Mesoporous silica nanocarriers with tunable particle sizes and different loadings of pendent carboxylic groups were successfully prepared by a straightforward and reproducible strategy, in which carboxyethylsilanetriol sodium salt was co-condensed with tetraethoxyorthosilicate to introduce the carboxylic groups. The key in this strategy was to separate the synthesis process into two steps of the nuclei formation and particle growth. The uniform particle size and ordered structure of the synthesized nanocarriers were manifested by several techniques such as XRD, TEM, SEM, and BET. DLS measurement illustrated that nanocarriers could be well suspended in aqueous solution. The integration and content tunability of the carboxylic groups within mesoporous silica nanoparticles (MSNs) were verified by FT-IR and (29)Si NMR. The inherent carboxylic units on the obtained carboxylic group modified MSNs (MSNs-C) effectively enhanced the capture and tailored the release properties of the anticancer drug of cisplatin. The accumulation of drug in the HeLa cells was greatly enhanced due to the highly efficient platinum uptake efficiency transported by the synthesized nanocarriers. The drug encapsulated in the MSNs-C exhibited a higher antitumor activity than free cisplatin against both MCF-7 and HeLa cells.
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Affiliation(s)
- Jinlou Gu
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
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35
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Schwabe P, Greiner S, Ganzert R, Eberhart J, Dähn K, Stemberger A, Plank C, Schmidmaier G, Wildemann B. Effect of a novel nonviral gene delivery of BMP-2 on bone healing. ScientificWorldJournal 2012; 2012:560142. [PMID: 23213289 PMCID: PMC3504401 DOI: 10.1100/2012/560142] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Accepted: 09/30/2012] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Gene therapeutic drug delivery approaches have been introduced to improve the efficiency of growth factors at the site of interest. This study investigated the efficacy and safety of a new nonviral copolymer-protected gene vector (COPROG) for the stimulation of bone healing. METHODS In vitro, rat osteoblasts were transfected with COPROG + luciferase plasmid or COPROG + hBMP-2 plasmid. In vivo, rat tibial fractures were intramedullary stabilized with uncoated versus COPROG+hBMP-2-plasmid-coated titanium K-wires. The tibiae were prepared for biomechanical and histological analyses at days 28 and 42 and for transfection/safety study at days 2, 4, 7, 28, and 42. RESULTS In vitro results showed luciferase expression until day 21, and hBMP-2-protein was measured from day 2 - day 10. In vivo, the local application of hBMP-2-plasmid showed a significantly higher maximum load after 42 days compared to that in the control. The histomorphometric analysis revealed a significantly less mineralized periosteal callus area in the BMP-2 group compared to the control at day 28. The rt-PCR showed no systemic biodistribution of luciferase RNA. CONCLUSION A positive effect on fracture healing by nonviral BMP-2 plasmid application from COPROG-coated implants could be shown in this study; however, the effect of the vector may be improved with higher plasmid concentrations. Transfection showed no biodistribution to distant organs and was considered to be safe.
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Affiliation(s)
- P Schwabe
- Center for Musculoskeletal Surgery and Julius Wolff Institute, Charité-University Medicine Berlin, Campus Virchow, Augustenburger Platz 1, 13353 Berlin, Germany.
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Wang X, Jiang Z, Shi J, Liang Y, Zhang C, Wu H. Metal-organic coordination-enabled layer-by-layer self-assembly to prepare hybrid microcapsules for efficient enzyme immobilization. ACS Appl Mater Interfaces 2012; 4:3476-3483. [PMID: 22724538 DOI: 10.1021/am300559j] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A novel layer-by-layer self-assembly approach enabled by metal-organic coordination was developed to prepare polymer-inorganic hybrid microcapsules. Alginate was first activated via N-ethyl-N'-(3-dimethylaminopropyl) carbodiimide (EDC) and N-hydroxy succinimide (NHS) coupling chemistry, and subsequently reacted with dopamine. Afterward, the dopamine modified alginate (Alg-DA) and titanium(IV) bis(ammonium lactato) dihydroxide (Ti(IV)) were alternatively deposited onto CaCO3 templates. The coordination reaction between the catechol groups of Alg-DA and the Ti(IV) allowed the alternative assembly to form a series of multilayers. After removing the templates, the alginate-titanium hybrid microcapsules were obtained. The high mechanical stability of hybrid microcapsules was demonstrated by osmotic pressure experiment. Furthermore, the hybrid microcapsules displayed superior thermal stability due to Ti(IV) coordination. Catalase (CAT) was used as model enzyme, either encapsulated inside or covalently attached on the surface of the resultant microcapsules. No CAT leakage from the microcapsules was detected after incubation for 48 h. The encapsulated CAT, with a loading capacity of 450-500 mg g(-1) microcapsules, exhibited desirable long-term storage stability, whereas the covalently attached CAT, with a loading capacity of 100-150 mg g(-1) microcapsules, showed desirable operational stability.
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Affiliation(s)
- Xiaoli Wang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University , Tianjin, P. R. China
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37
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Abstract
Nanoscale vehicles for delivery have been of interest and extensively studied for two decades. However, the encapsulation stability of hydrophobic drug molecules in delivery vehicles and selective targeting these vehicles into disease cells are potential hurdles for efficient delivery systems. Here we demonstrate a simple and fast synthetic protocol of nanogels that shows high encapsulation stabilities. These nanogels can also be modified with various targeting ligands for active targeting. We show that the targeting nanogels (T-NGs), which are prepared within 2 h by a one-pot synthesis, exhibit very narrow size distributions and have the versatility of surface modification with cysteine-modified ligands including folic acid, cyclic arginine-glycine-aspartic acid (cRGD) peptide, and cell-penetrating peptide. T-NGs hold their payloads, undergo facilitated cell internalization by receptor-mediated uptake, and release their drug content inside cells due to the reducing intracellular environment. Selective cytotoxicity to cells, which have complementary receptors, is also demonstrated.
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Affiliation(s)
- Ja-Hyoung Ryu
- Department of Chemistry, University of Massachusetts, 710 N. Pleasant Street, Amherst, MA 01003
| | - Sean Bickerton
- Department of Chemistry, University of Massachusetts, 710 N. Pleasant Street, Amherst, MA 01003
| | - Jiaming Zhuang
- Department of Chemistry, University of Massachusetts, 710 N. Pleasant Street, Amherst, MA 01003
| | - S. Thayumanavan
- Department of Chemistry, University of Massachusetts, 710 N. Pleasant Street, Amherst, MA 01003
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O'Loughlin JA, Bruder JM, Lysaght MJ. Oral administration of biochemically active microcapsules to treat uremia: new insights into an old approach. Journal of Biomaterials Science, Polymer Edition 2012; 15:1447-61. [PMID: 15648574 DOI: 10.1163/1568562042368068] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
This paper begins with an extensive review of previous research on the degradation of non-protein nitrogen compounds for improved therapy of renal failure. During the 1970s, Malchesky established that naturally occurring strains of microorganisms were highly effective for the in vitro degradation of urea and other compounds found in urine, and that these bacteria could be conditioned with selected media to enhance growth and degradation efficiency. A few years later, Setala introduced the concept of oral delivery of lyophilized bacteria, harvested from soil, to uremic patients, for degradation of non-protein nitrogen compounds. In the 1990s, Chang proposed delivery of encapsulated genetically modified bacteria for removal of uremic waste products in vitro and in vivo. Recently, our group has pursued the idea of orally delivering formulated combinations of enzymes or modified bacteria. A new study is also described, which characterizes the capacity of a single alginate microcapsule containing a mixture of genetically modified cells and enzyme to degrade urea, uric acid and creatinine. The combination capsules were found to be effective in vitro and in vivo in a rodent model of chemically-induced renal failure. Reduction of urea concentration in vivo required co-administration of a cation exchange resin to adsorb ammonia. Increased investigative effort is warranted for these approaches which offer significant potential as an adjunct to conventional forms of dialysis.
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Affiliation(s)
- Jill A O'Loughlin
- Center for Biomedical Engineering, Brown University, Providence, RI 02912-G, USA.
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Khung YL, Li Lee W, Chui KL, Liu Y, Lim MP, Huang CL, Loo SCJ. Microencapsulation of dye- and drug-loaded particles for imaging and controlled release of multiple drugs. Adv Healthc Mater 2012. [PMID: 23184718 DOI: 10.1002/adhm.201100007] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A polymeric microcapsule that can house different drug-loaded particles using a simple emulsion packaging technique is presented. Compared to the neat microparticles, microcapsules simultaneously release multiple drugs in a sustained manner. These microcapsules could provide a means of controlling release of multiple drugs.
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Affiliation(s)
- Yit-Lung Khung
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
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40
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Abstract
We demonstrate the assembly of extremely robust and pH-responsive thin shell LbL microcapsules from silk fibroin counterparts modified with poly(lysine) and poly(glutamic) acid, which are based on biocompatible silk ionomer materials in contrast with usually exploited synthetic polyelectrolytes. The microcapsules are extremely stable in an unusually wide pH range from 1.5 to 12.0 and show a remarkable degree of reversible swelling/deswelling response in dimensions, as exposed to extreme acidic and basic conditions. These changes are accompanied by reversible variations in shell permeability that can be utilized for pH-controlled loading and unloading of large macromolecules. Finally, we confirmed that these shells can be utilized to encapsulate yeast cells with a viability rate much higher than that for traditional synthetic polyelectrolytes.
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Affiliation(s)
- Chunhong Ye
- School of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, P. R. China
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (USA)
| | - Olga Shchepelina
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (USA)
| | - Rossella Calabrese
- Department of Biomedical Engineering, Tufts University, 4, Colby street, Medford, MA 02155 (USA)
| | - Irina Drachuk
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (USA)
| | - David L. Kaplan
- Department of Biomedical Engineering, Tufts University, 4, Colby street, Medford, MA 02155 (USA)
| | - Vladimir V. Tsukruk
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (USA)
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41
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Nechifor R, Ardelean I, Mattea C, Stapf S, Bogdan M. NMR relaxation dispersion of Miglyol molecules confined inside polymeric micro-capsules. Magn Reson Chem 2011; 49:730-733. [PMID: 22002629 DOI: 10.1002/mrc.2821] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2011] [Revised: 07/25/2011] [Accepted: 07/25/2011] [Indexed: 05/31/2023]
Abstract
Frequency dependent NMR relaxation studies have been carried out on Miglyol molecules confined inside core shell polymeric capsules to obtain a correlation between capsule dimension and the measurable parameters. The polymeric capsules were prepared using an interfacial polymerization technique for three different concentrations of Miglyol. It was shown that the variation of Miglyol concentration influences the capsule dimension. Their average size was estimated using the pulsed field gradient diffusometry technique. The relaxation dispersion curves were obtained at room temperature by a combined use of a fast field cycling instrument and a high-field instrument. The frequency dependence of relaxation rate shows a transition from a diffusion-limited to a surface-limited relaxation regime.
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Affiliation(s)
- Ruben Nechifor
- Department of Physics, Technical University of Cluj-Napoca, Cluj-Napoca, Romania
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42
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Yu X, Zhao Z, Nie W, Deng R, Liu S, Liang R, Zhu J, Ji X. Biodegradable polymer microcapsules fabrication through a template-free approach. Langmuir 2011; 27:10265-10273. [PMID: 21766809 DOI: 10.1021/la201944s] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A detailed study on the direct synthesis of biocompatible polyesters (e.g., PLA, PLGA or PCL) microcapsules and multifunctional microcapsules, which does not require any template and core removal, is presented. The technique is based on the modified self-emulsification process within the emulsion droplets by simply adding sodium dioctyl sulfosuccinate (Aerosol OT or AOT) as a cosurfactant to the initial polymer solution, followed by double emulsion formation due to the coalescence of the internal water droplets. Microcapsules with tunable sizes (ranging from hundreds of nanometers to tens of micrometers) and morphologies were then obtained through solidification of droplet shell of the double emulsion via solvent removal. In this report, we have systematically investigated the effect of experimental parameters, such as polymer and AOT concentration, polymer molecular weight on the double emulsion formation process, and the final morphologies of the microcapsules. We demonstrate that the capsules can encapsulate either hydrophobic or hydrophilic dyes during solvent evaporation. Dye-release studies show a correlation between shell thickness, capsules size, and diffusive release rate, providing insights into the shell formation and shell thickness processing. Moreover, hydrophobic nanoparticles, such as oleic-acid coated Fe(3)O(4) nanoparticles and quantum dots, can also be incorporated into the walls of the microcapsules. Such functional microcapsules might find applications in the fields of controlled release, bioimaging, diagnostics, and targeting.
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Affiliation(s)
- Xi Yu
- Hubei Key Lab of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074 China
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Ma X, Li Y, Li X, Yang L, Wang X. Preparation of novel polysulfone capsules containing zirconium phosphate and their properties for Pb2+ removal from aqueous solution. J Hazard Mater 2011; 188:296-303. [PMID: 21333440 DOI: 10.1016/j.jhazmat.2011.01.107] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2010] [Revised: 01/25/2011] [Accepted: 01/26/2011] [Indexed: 05/30/2023]
Abstract
Zirconium phosphate (ZrP) was immobilized by microencapsulation process of polysulfone (PSF) to form the polysulfone capsules containing ZrP (PSF@ZrP capsules) successfully by using phase inversion precipitation technique, and the PSF@ZrP was employed as capsules adsorbents to remove Pb(2+) presented in aqueous solution. The result shows that an encapsulation capacity of 50% (mass ratio, PSF: ZrP = 1:1) should be the optimal proportion of ZrP encapsulated with PSF. The characterization of the macroscopical and microcosmic physical properties of the resulting PSF@ZrP capsules was carried out by the DTA-TG, XRD, BET and SEM. Meanwhile, the adsorption properties of the PSF@ZrP capsules for Pb(2+) were investigated by batch methods. It was found that the adsorption of the PSF@ZrP capsules for Pb(2+) would be pH dependent due to the ion-exchange mechanism, and the uptake of Pb(2+) was slightly influenced with the concentration of coexisting cations (Na(+), K(+)) in a low range. Furthermore, the calculated thermodynamics parameters exhibit that the nature of the adsorption process is spontaneous and exothermic. After six times of adsorption-regeneration cycles, no significant loss of adsorption capacity was observed, indicating the good stability of the PSF@ZrP capsules. Consequently, the PSF@ZrP capsules in this work can provide a potential application for treatment process of Pb(2+)-containing wastewater.
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Affiliation(s)
- Xiaojie Ma
- College of Chemistry and Chemical Engineering, State Key Laboratory of Applied Organic Chemistry, College of Resources and Environment, Institute of Biochemical Engineering & Environmental Technology, Lanzhou University, Lanzhou 730000, PR China
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44
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Abstract
Herein we report the preparation of layer-by-layer (LbL) assembled, biodegradable, covalently stabilized capsules with tunable degradation properties. Poly(L-glutamic acid) modified with alkyne moieties (PGA(Alk)) was alternately assembled with poly(N-vinyl pyrrolidone) (PVPON) on silica particles via hydrogen-bonding. The films were cross-linked with a bis-azide linker, followed by removal of the sacrificial template and PVPON at physiological pH through hydrogen bond disruption, yielding one-component PGA(Alk) capsules. To control the kinetics and location of capsule degradation, a number of approaches were investigated. First, a degradable bis-azide cross-linker was incorporated into the inherently enzymatically degradable capsules. Second, we assembled low-fouling capsules composed of nondegradable poly(N-vinyl pyrrolidone-ran-propargyl acrylate) (PVPON(Alk)) via hydrogen bonding with poly(methacrylic acid) (PMA) and combined this with the aforementioned system (PGA(Alk)/PVPON) to produce stratified hybrid capsules. The degradation profiles of these stratified capsules can be closely controlled by the number as well as the position of nondegradable barrier layers in the systems. The facile tailoring of the degradation kinetics makes this stratified LbL approach promising for the design of tailored drug-delivery vehicles.
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Affiliation(s)
- Christopher J Ochs
- Department of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, Victoria, Australia
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45
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Del Mercato LL, Abbasi AZ, Parak WJ. Synthesis and characterization of ratiometric ion-sensitive polyelectrolyte capsules. Small 2011; 7:351-363. [PMID: 21294264 DOI: 10.1002/smll.201001144] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2010] [Revised: 08/11/2010] [Indexed: 05/30/2023]
Abstract
Micrometer-sized polyelectrolyte capsules are synthesized, which have ion-sensitive fluorophores embedded in their cavities. As the membranes of the capsules are permeable to ions, the fluorescence of the capsules changed with the ion concentration. In particular, capsules sensitive to protons, sodium, potassium, and chloride ions are fabricated and their fluorescence response analyzed. In order to allow for ratiometric measurements, additional fluorophores whose emission do not depend on the ion concentration and which emit a different wavelength are co-embedded in the capsule cavities.
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Affiliation(s)
- Loretta L Del Mercato
- Fachbereich Physik and Wissenschaftliches Zentrum für, Materialwissenschaften, Philipps Universität Marburg, Marburg, Germany
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46
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Zhang L, Shi J, Jiang Z, Jiang Y, Meng R, Zhu Y, Liang Y, Zheng Y. Facile preparation of robust microcapsules by manipulating metal-coordination interaction between biomineral layer and bioadhesive layer. ACS Appl Mater Interfaces 2011; 3:597-605. [PMID: 21344913 DOI: 10.1021/am101184h] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A novel approach combining biomimetic mineralization and bioadhesion is proposed to prepare robust and versatile organic-inorganic hybrid microcapsules. More specifically, these microcapsules are fabricated by sequential deposition of inorganic layer and organic layer on the surface of CaCO(3) microparticles, followed by the dissolution of CaCO(3) microparticles using EDTA. During the preparation process, protamine induces the hydrolysis and condensation of titania or silica precursor to form the inorganic layer or the biomineral layer. The organic layer or bioadhesive layer was formed through the rapid, spontaneous oxidative polymerization of dopamine into polydopamine (PDA) on the surface of the biomineral layer. There exist multiple interactions between the inorganic layer and the organic layer. Thus, the as-prepared organic-inorganic hybrid microcapsules acquire much higher mechanical stability and surface reactivity than pure titania or pure silica microcapsules. Furthermore, protamine/titania/polydopamine hybrid microcapsules display superior mechanical stability to protamine/silica/polydopamine hybrid microcapsules because of the formation of Ti(IV)-catechol coordination complex between the biomineral layer and the bioadhesive layer. As an example of application, three enzymes are respectively immobilized through physical encapsulation in the lumen, in situ entrapment within the wall and chemical attachment on the out surface of the hybrid microcapsules. The as-constructed multienzyme system displays higher catalytic activity and operational stability. Hopefully, the approach developed in this study will evolve as a generic platform for facile and controllable preparation of organic-inorganic hybrid materials with different compositions and shapes for a variety of applications in catalysis, sensor, drug/gene delivery.
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Affiliation(s)
- Lei Zhang
- Key Laboratory for Green Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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47
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Ru Q, Yu H, Huang Q. Encapsulation of epigallocatechin-3-gallate (EGCG) using oil-in-water (O/W) submicrometer emulsions stabilized by ι-carrageenan and β-lactoglobulin. J Agric Food Chem 2010; 58:10373-10381. [PMID: 20843038 DOI: 10.1021/jf101798m] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Oil-in-water (O/W) submicrometer emulsions stabilized by ι-carrageenan and β-lactoglobulin were successfully prepared by high-pressure homogenization (HPH), with the goal to develop biocompatible carriers for the active component of green tea, epigallocatechin-3-gallate (EGCG). The effects of pressure and the number of cycles on the physical properties of emulsions, such as droplet sizes, microstructure, and rheological properties were investigated. The increase in both processing pressure and the number of HPH cycles resulted in a decrease in droplet sizes and viscosities. A submicrometer O/W emulsion with a droplet size of about 400 nm was used to encapsulate EGCG. The results showed that, when EGCG concentration was up to 0.5% in the emulsion, EGCG could be successfully encapsulated in the O/W emulsions stabilized by ι-carrageenan and β-lactoglobulin. Within 14 days, emulsion droplet sizes showed negligible changes. However, when EGCG concentration was >0.5%, significant instability of the O/W emulsions due to the binding between EGCG and β-lactoglobulin was observed, as evidenced by the largely increased droplet sizes from light scattering and the appearance of large aggregates in the optical images. Moreover, EGCG encapsulated in an O/W submicrometer emulsion revealed an enhanced in vitro anticancer activity compared to the free EGCG. This study provides a novel encapsulation formulation to increase the biological efficacy of EGCG.
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Affiliation(s)
- Qiaomei Ru
- Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901, USA
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48
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Gibbons A, McElvaney NG, Cryan SA. A dry powder formulation of liposome-encapsulated recombinant secretory leukocyte protease inhibitor (rSLPI) for inhalation: preparation and characterisation. AAPS PharmSciTech 2010; 11:1411-21. [PMID: 20839079 PMCID: PMC2974130 DOI: 10.1208/s12249-010-9500-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [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: 11/02/2009] [Accepted: 07/23/2010] [Indexed: 01/19/2023] Open
Abstract
Inhaled recombinant secretory leukocyte protease inhibitor (rSLPI) has shown potential for the treatment of inflammatory lung conditions. Rapid inactivation of rSLPI by cathepsin L (Cat L) and rapid clearance from the lungs has limited clinical efficacy to date. Previous studies by us have shown that encapsulation of rSLPI within1,2-dioleoyl-sn-glycero-3-[phospho-L-serine]/cholesterol (DOPS/Chol) liposomes protects rSLPI against Cat L inactivation in vitro. Liquid DOPS-rSLPI preparations were found to be unstable upon long-term storage and nebulisation. The aim of this study was therefore to develop a method of manufacture for preparing DOPS-rSLPI liposomes as a dry powder for inhalation. DOPS-rSLPI dry powders were lyophilised and subsequently micronised with a novel micronisation aid. The effects of formulation and processing on rSLPI stability, activity, and uniformity of content within the powders were characterised. Using D-mannitol as the micronisation aid, dry powder particles in the inhalable size range (<5 μm) were prepared. By optimising process parameters, up to 54% of rSLPI was recovered after micronisation, of which there was no significant loss in anti-neutrophil elastase activity and no detectable evidence of protein degradation. Aerosolisation was achieved using a dry powder inhaler, and mass median aerodynamic diameter (MMAD) was evaluated after collection in a cascade impactor. Aerosolisation of the DOPS-rSLPI dry powder yielded 38% emitted dose, with 2.44 μm MMAD. When challenged with Cat L post-aerosolisation, DOPS-rSLPI dry powder was significantly better at retaining a protective function against Cat L-induced rSLPI inactivation compared to the aqueous DOPS-rSLPI liposome dispersion and was also more stable under storage.
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Affiliation(s)
- Aileen Gibbons
- />School of Pharmacy, Royal College of Surgeons in Ireland, York House, York Street, Dublin 2, Ireland
| | - Noel G. McElvaney
- />Department of Medicine, Beaumont Hospital, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Sally-Ann Cryan
- />School of Pharmacy, Royal College of Surgeons in Ireland, York House, York Street, Dublin 2, Ireland
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49
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Khan F, Katara R, Ramteke S. Enhancement of bioavailability of cefpodoxime proxetil using different polymeric microparticles. AAPS PharmSciTech 2010; 11:1368-75. [PMID: 20821175 PMCID: PMC2974107 DOI: 10.1208/s12249-010-9505-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [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: 07/01/2009] [Accepted: 06/30/2010] [Indexed: 11/30/2022] Open
Abstract
Poorly water-soluble drugs such as cefpodoxime proxetil (400 μg/ml) offer a challenging problem in drug formulation as poor solubility is generally associated with poor dissolution characteristics and thus poor oral bioavailability. According to these characteristics, preparation of cefpodoxime proxetil microparticle has been achieved using high-speed homogenization. Polymers (methylcellulose, sodium alginate, and chitosan) were precipitated on the surface of cefpodoxime proxetil using sodium citrate and calcium chloride as salting-out agents. The pure drug and the prepared microparticles with different concentrations of polymer (0.05-1.0%) were characterized in terms of solubility, drug content, particle size, thermal behavior (differential scanning calorimeter), surface morphology (scanning electron microscopy), in vitro drug release, and stability studies. The in vivo performance was assessed by pharmacokinetic study. The dissolution studies demonstrate a marked increase in the dissolution rate in comparison with pure drug. The considerable improvement in the dissolution rate of cefpodoxime proxetil from optimized microparticle was attributed to the wetting effect of polymers, altered surface morphology, and micronization of drug particles. The optimized microparticles exhibited excellent stability on storage at accelerated condition. The in vivo studies revealed that the optimized formulations provided improved pharmacokinetic parameter in rats as compared with pure drug. The particle size of drug was drastically reduced during formulation process of microparticles.
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Affiliation(s)
- Fahim Khan
- School of Pharmaceutical Sciences, Rajive Gandhi Technical University, Airport Bypass Road, Gandhi Nagar, Bhopal, Madhya Pradesh 462036 India
| | - Rajesh Katara
- School of Pharmaceutical Sciences, Rajive Gandhi Technical University, Airport Bypass Road, Gandhi Nagar, Bhopal, Madhya Pradesh 462036 India
| | - Suman Ramteke
- School of Pharmaceutical Sciences, Rajive Gandhi Technical University, Airport Bypass Road, Gandhi Nagar, Bhopal, Madhya Pradesh 462036 India
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50
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Patra D, Malvankar N, Chin E, Tuominen M, Gu Z, Rotello VM. Fabrication of conductive microcapsules via self-assembly and crosslinking of gold nanowires at liquid-liquid interfaces. Small 2010; 6:1402-1405. [PMID: 20461726 DOI: 10.1002/smll.200902380] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Affiliation(s)
- Debabrata Patra
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, MA 01003, USA
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