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Zhu Y, Joralmon D, Shan W, Chen Y, Rong J, Zhao H, Xiao S, Li X. 3D printing biomimetic materials and structures for biomedical applications. Biodes Manuf 2021. [DOI: 10.1007/s42242-020-00117-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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2
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Shi J, Zhao S, Jiang H, Xu S, Zhao F, Shen R, Ye Y, Zhu P. Multi-size control of homogeneous explosives by coaxial microfluidics. REACT CHEM ENG 2021. [DOI: 10.1039/d1re00328c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A coaxial microfluidic platform was developed for the multi-size control of homogeneous explosives.
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Affiliation(s)
- Jinyu Shi
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Shuangfei Zhao
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211800, China
| | - Hanyu Jiang
- Science and Technology on Combustion and Explosion Laboratory, Xi'an Modern Chemistry Research Institute, Shaanxi, Xi'an 710065, China
| | - Siyu Xu
- Science and Technology on Combustion and Explosion Laboratory, Xi'an Modern Chemistry Research Institute, Shaanxi, Xi'an 710065, China
| | - Fengqi Zhao
- Science and Technology on Combustion and Explosion Laboratory, Xi'an Modern Chemistry Research Institute, Shaanxi, Xi'an 710065, China
| | - Ruiqi Shen
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Yinghua Ye
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Peng Zhu
- School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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Ge M, Sheng Y, Qi S, Cao L, Zhang Y, Yang J. PLGA/chitosan-heparin composite microparticles prepared with microfluidics for the construction of hMSC aggregates. J Mater Chem B 2020; 8:9921-9932. [PMID: 33034328 DOI: 10.1039/d0tb01593h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Incorporating poly(lactic-co-glycolic) acid (PLGA) microparticles into human mesenchymal stem cells (hMSC) aggregates has shown promising application prospects. However, the acidic degradation products and burst release of PLGA microparticles still need to be ameliorated. In this study, the PLGA/chitosan-heparin (P/C-h) composite microparticles were successfully fabricated by integrating the double emulsion and microfluidic technology through the precise manipulation of the emulsion composition and flow rate of the two-phase in a flow-focusing chip. The P/C-h microparticles were highly monodispersed with a diameter of 23.45 ± 0.25 μm and shell-core structure of the PLGA encapsulated C-h complex, which were suitable for the fabrication of hMSC aggregates. When the mass ratio of PLGA to the C-h complex was optimized to 2 : 1, the pH of the leach liquor of P/C-h microparticles remained neutral. Compared with those of PLGA microparticles, the cytotoxicity and the initial burst release (loaded FGF-2 and VEGF) were both significantly reduced in P/C-h microparticles. Furthermore, the survival, stemness, as well as secretion and migration abilities of cells in hMSC aggregates incorporating P/C-h microparticles were also enhanced. In summary, the P/C-h composite microparticles prepared by the droplet microfluidic technique support the optimal biological and functional profile of the hMSC aggregates, which may facilitate the clinical applications of MSC-based therapy.
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Affiliation(s)
- Min Ge
- The Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Science, Nankai University, Tianjin, 300071, China.
| | - Yaqi Sheng
- The Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Science, Nankai University, Tianjin, 300071, China.
| | - Shuyue Qi
- The Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Science, Nankai University, Tianjin, 300071, China.
| | - Lei Cao
- The Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Science, Nankai University, Tianjin, 300071, China.
| | - Yan Zhang
- The Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Science, Nankai University, Tianjin, 300071, China. and State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, 300350, China.
| | - Jun Yang
- The Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Science, Nankai University, Tianjin, 300071, China.
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Bansal A, D'Sa S, D'Souza MJ. Biofabrication of microcapsules encapsulating beta-TC-6 cells via scalable device and in-vivo evaluation in type 1 diabetic mice. Int J Pharm 2019; 572:118830. [PMID: 31715349 DOI: 10.1016/j.ijpharm.2019.118830] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Revised: 10/21/2019] [Accepted: 10/26/2019] [Indexed: 02/08/2023]
Abstract
Type 1 diabetes mellitus (T1DM) is a disease characterized by lack of pancreatic islet function. Whole tissue transplantation appears to be a viable alternative in the management of T1DM. This study aims at the fabrication and evaluation of alginate-chitosan microcapsules encapsulating insulin-secreting beta-TC-6 cells using an automated spraying nozzle. Uniform spherical microcapsules (250-350 µm) encapsulated with beta-TC-6 cells were fabricated in large quantities in a short span of time. Microencapsulated beta-TC-6 cells were transplanted intraperitoneally into streptozotocin (STZ) induced diabetic mice and monitored for immune tolerance and decrease in blood glucose levels. Mice that received microencapsulated beta-TC-6 cells maintained normoglycemia for 35 ± 5 days before rejection. However, the group that received naked beta-TC-6 cells rejected the cells within 1-2 days, unable to control elevated blood glucose levels. They also exhibited high immune reactions, as evidenced by elevated levels of CD8+ and CD62L T cells. CD4+ T cells that mediated a Th2 response (humoral response) were predominant in microencapsulated beta-TC-6 cells and cells only group as evidenced by elevated levels of CD45R. Our findings from the in-vivo study demonstrated that transplantation of microencapsulated beta-TC-6 cells can be a viable alternative in the management of T1DM with acceptable immune response.
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Affiliation(s)
- Amit Bansal
- Center for Drug Delivery Research, Vaccine Nanotechnology Laboratory, Mercer University, College of Pharmacy, Atlanta, GA 30341, USA.
| | - Sucheta D'Sa
- Center for Drug Delivery Research, Vaccine Nanotechnology Laboratory, Mercer University, College of Pharmacy, Atlanta, GA 30341, USA
| | - Martin J D'Souza
- Center for Drug Delivery Research, Vaccine Nanotechnology Laboratory, Mercer University, College of Pharmacy, Atlanta, GA 30341, USA
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Huang L, Wu K, Zhang R, Ji H. Fabrication of Multicore Milli- and Microcapsules for Controlling Hydrophobic Drugs Release Using a Facile Approach. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b02351] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Liyun Huang
- Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
| | - Kui Wu
- Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
| | - Rui Zhang
- Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
- Guangdong Provincial Key Lab of Green Chemical Product Technology, Guangzhou 510640, China
| | - Hongbing Ji
- Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
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Zhao H, Chen Y, Shao L, Xie M, Nie J, Qiu J, Zhao P, Ramezani H, Fu J, Ouyang H, He Y. Airflow-Assisted 3D Bioprinting of Human Heterogeneous Microspheroidal Organoids with Microfluidic Nozzle. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:e1802630. [PMID: 30133151 DOI: 10.1002/smll.201802630] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 07/30/2018] [Indexed: 05/12/2023]
Abstract
Hydrogel microspheroids are widely used in tissue engineering, such as injection therapy and 3D cell culture, and among which, heterogeneous microspheroids are drawing much attention as a promising tool to carry multiple cell types in separated phases. However, it is still a big challenge to fabricate heterogeneous microspheroids that can reconstruct built-up tissues' microarchitecture with excellent resolution and spatial organization in limited sizes. Here, a novel airflow-assisted 3D bioprinting method is reported, which can print versatile spiral microarchitectures inside the microspheroids, permitting one-step bioprinting of fascinating hydrogel structures, such as the spherical helix, rose, and saddle. A microfluidic nozzle is developed to improve the capability of intricate cell encapsulation with heterotypic contact. Complex structures, such as a rose, Tai chi pattern, and single cell line can be easily printed in spheroids. The theoretical model during printing is established and process parameters are systematically investigated. As a demonstration, a human multicellular organoid of spirally vascularized ossification is reconstructed with this method, which shows that it is a powerful tool to build mini tissues on microspheroids.
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Affiliation(s)
- Haiming Zhao
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Yishan Chen
- Dr. Li Dak Sum & Yip Yio Chin Center for Stem Cells and Regenerative Medicine, Zhejiang University, Hangzhou, 310058, China
| | - Lei Shao
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Mingjun Xie
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Jing Nie
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Jingjiang Qiu
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Peng Zhao
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Hamed Ramezani
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Jianzhong Fu
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Hongwei Ouyang
- Dr. Li Dak Sum & Yip Yio Chin Center for Stem Cells and Regenerative Medicine, Zhejiang University, Hangzhou, 310058, China
- Zhejiang University-University of Edinburgh (ZJU-UoE) Institute, Zhejiang University, Hangzhou, 310058, China
| | - Yong He
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
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Wang L, Yang Q, Chen Y, Chai Y, Li JJ, Du L, Tan R, Yang S, Tu M, Yu B. A reformative shear precipitation procedure for the fabrication of vancomycin-loaded poly(lactide-co-glycolide) microspheres. J Biomater Appl 2017; 31:995-1009. [PMID: 28068861 DOI: 10.1177/0885328216689199] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
This study reports the encapsulation of vancomycin, as a model hydrophilic drug, into poly(lactide-co-glycolide) microspheres using a novel reformative shear precipitation procedure. In contrast to the external aqueous phase used in the conventional microencapsulation technique based on emulsion solvent evaporation/extraction, the reformative shear precipitation procedure explored in this study uses a shear medium composed of glycerol as the viscous medium and ethanol as polymer antisolvent, which is relatively immiscible with the hydrophilic drug. This limits drug diffusion and leads to rapid microsphere solidification, which allows a large proportion of the hydrophilic drug to be encapsulated within the microspheres. The influence of various processing parameters, including polymer concentration, volume ratio of ethanol to glycerol in the shear medium, volume of aqueous drug solution, initial drug loading, and injecting rate of the drug-polymer emulsion, on the encapsulation efficiency and characteristics of resulting microspheres were investigated. The morphology and release characteristics, as well as mechanical, in vitro and in vivo behaviour of vancomycin-loaded poly(lactide-co-glycolide) microspheres prepared using the novel procedure were also investigated. The results demonstrated that the reformative shear precipitation procedure could achieve the loading of hydrophilic drugs into poly(lactide-co-glycolide) microspheres with high encapsulation efficiency, and the success of the procedure was largely influenced by the volume ratio of ethanol to glycerol in the shear medium. Vancomycin-loaded poly(lactide-co-glycolide) microspheres prepared using this procedure demonstrated favourable mechanical characteristics, antibacterial activity, and in vivo degradation behaviour which suggested their suitability for use as a sustained delivery system.
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Affiliation(s)
- Lei Wang
- 1 Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou, People's Republic of China
| | - Qinmeng Yang
- 1 Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou, People's Republic of China
| | - Yirong Chen
- 1 Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou, People's Republic of China
| | - Yu Chai
- 1 Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou, People's Republic of China
| | - Jiao Jiao Li
- 2 Biomaterials and Tissue Engineering Research Unit, School of AMME, University of Sydney, Sydney, NSW, Australia
| | - Lin Du
- 3 Department of Materials Science and Engineering, College of Science and Engineering, Jinan University, Guangzhou, People's Republic of China
| | - Ruizhe Tan
- 3 Department of Materials Science and Engineering, College of Science and Engineering, Jinan University, Guangzhou, People's Republic of China
| | - Shenyu Yang
- 3 Department of Materials Science and Engineering, College of Science and Engineering, Jinan University, Guangzhou, People's Republic of China
| | - Mei Tu
- 3 Department of Materials Science and Engineering, College of Science and Engineering, Jinan University, Guangzhou, People's Republic of China
| | - Bin Yu
- 1 Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou, People's Republic of China
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Fabrication of uniform-sized poly-ɛ-caprolactone microspheres and their applications in human embryonic stem cell culture. Biomed Microdevices 2016; 17:105. [PMID: 26458560 DOI: 10.1007/s10544-015-0010-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The generation of liquefied poly-ɛ-caprolactone (PCL) droplets by means of a microfluidic device results in uniform-sized microspheres, which are validated as microcarriers for human embryonic stem cell culture. Formed droplet size and size distribution, as well as the resulting PCL microsphere size, are correlated with the viscosity and flow rate ratio of the dispersed (Q d) and continuous (Q c) phases. PCL in dichloromethane increases its viscosity with concentration and molecular weight. Higher viscosity and Q d/Q c lead to the formation of larger droplets, within two observed formation modes: dripping and jetting. At low viscosity of dispersed phase and Q d/Q c, the microfluidic device is operated in dripping mode, which generates droplets and microspheres with greater size uniformity. Solutions with lower molecular weight PCL have lower viscosity, resulting in a wider concentration range for the dripping mode. When coated with extracellular matrix (ECM) proteins, the fabricated PCL microspheres are demonstrated capable of supporting the expansion of human embryonic stem cells.
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João CFC, Vasconcelos JM, Silva JC, Borges JP. An overview of inverted colloidal crystal systems for tissue engineering. TISSUE ENGINEERING PART B-REVIEWS 2014; 20:437-54. [PMID: 24328724 DOI: 10.1089/ten.teb.2013.0402] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Scaffolding is at the heart of tissue engineering but the number of techniques available for turning biomaterials into scaffolds displaying the features required for a tissue engineering application is somewhat limited. Inverted colloidal crystals (ICCs) are inverse replicas of an ordered array of monodisperse colloidal particles, which organize themselves in packed long-range crystals. The literature on ICC systems has grown enormously in the past 20 years, driven by the need to find organized macroporous structures. Although replicating the structure of packed colloidal crystals (CCs) into solid structures has produced a wide range of advanced materials (e.g., photonic crystals, catalysts, and membranes) only in recent years have ICCs been evaluated as devices for medical/pharmaceutical and tissue engineering applications. The geometry, size, pore density, and interconnectivity are features of the scaffold that strongly affect the cell environment with consequences on cell adhesion, proliferation, and differentiation. ICC scaffolds are highly geometrically ordered structures with increased porosity and connectivity, which enhances oxygen and nutrient diffusion, providing optimum cellular development. In comparison to other types of scaffolds, ICCs have three major unique features: the isotropic three-dimensional environment, comprising highly uniform and size-controllable pores, and the presence of windows connecting adjacent pores. Thus far, this is the only technique that guarantees these features with a long-range order, between a few nanometers and thousands of micrometers. In this review, we present the current development status of ICC scaffolds for tissue engineering applications.
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Affiliation(s)
- Carlos Filipe C João
- 1 CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa , Caparica, Portugal
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Mazzitelli S, Capretto L, Quinci F, Piva R, Nastruzzi C. Preparation of cell-encapsulation devices in confined microenvironment. Adv Drug Deliv Rev 2013; 65:1533-55. [PMID: 23933618 DOI: 10.1016/j.addr.2013.07.021] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Revised: 07/18/2013] [Accepted: 07/31/2013] [Indexed: 02/07/2023]
Abstract
The entrapment of cells into hydrogel microdevice in form of microparticles or microfibers is one of the most appealing and useful tools for cell-based therapy and tissue engineering. Cell encapsulation procedures allow the immunoisolation of cells from the surrounding environment, after their transplantation and the maintenance of the normal cellular physiology. Factors affecting the efficacy of microdevices, which include size, size distribution, morphology, and porosity are all highly dependent on the method of preparation. In this respect, microfluidic based methods offer a promising strategy to fabricate highly uniform and morphologically controlled microdevices with tunable chemical and mechanical properties. In the current review, various cell microencapsulation procedures, based on a microfluidics, are critically analyzed with a special focus on the effect of the procedure on the morphology, viability and functions of the embedded cells. Moreover, a brief introduction about the optimal characteristics of microdevice intended for cell encapsulation, together with the currently used materials for the production is reported. A further challenging application of microfluidics for the development of "living microchip" is also presented. Finally, the limitations, challenging and future work on the microfluidic approach are also discussed.
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Affiliation(s)
- Stefania Mazzitelli
- Department of Life Sciences and Biotechnology, University of Ferrara, Via F. Mortara 17/19, Ferrara 44121, Italy.
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De La Vega JC, Elischer P, Schneider T, Häfeli UO. Uniform polymer microspheres: monodispersity criteria, methods of formation and applications. Nanomedicine (Lond) 2013; 8:265-85. [DOI: 10.2217/nnm.12.210] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
For many applications, polymer microspheres (MS) should possess a monodisperse size distribution. With such uniformity they are able to deliver precise amounts of drug per MS, optimize the release kinetics of an encapsulated drug, obtain repeatable in vivo biodistributions to different organs and tissues, and obtain the maximum protection of (protein) drugs from degradation. This review classifies monodisperse polymer MS according to their methods of production and gives examples of the formation of uniform MS and their applications in the medical field. In the literature, the term ‘monodisperse’ is often used inaccurately, and this article attempts to rectify this by clearly defining monodispersity in terms of the coefficient of variation and the polydispersity index, the two statistical quantities most frequently used to describe the size distribution of MS.
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Affiliation(s)
- José Carlos De La Vega
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Philipp Elischer
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Thomas Schneider
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Urs O Häfeli
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, BC, Canada
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Droplet Microfluidic Technology: Mirodroplets Formation and Manipulation. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2012. [DOI: 10.1016/s1872-2040(11)60567-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gunduz O, Ahmad Z, Stride E, Edirisinghe M. A device for the fabrication of multifunctional particles from microbubble suspensions. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2012. [DOI: 10.1016/j.msec.2012.01.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Pan X, Ju J, Li J, Wu D. Poly(styrene-acrylamide-acrylic acid) copolymer fluorescent microspheres with improved hydrophilicity: preparation and influence on protein immobilization. HIGH PERFORM POLYM 2011. [DOI: 10.1177/0954008310391824] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Poly(styrene-acrylamide-acrylic acid) copolymer fluorescent microspheres (PSAAFMs) with improved surface hydrophilicity were synthesized through an improved soap-free emulsion copolymerization method, in which the proportion of acrylamide on the surface of the microspheres was increased. Azidocarbonyl groups, which can be rapidly coupled with proteins under mild conditions, were introduced onto the PSAAFMs using an azido reaction. The PSAAFMs were characterized using a fluorescence microscope, an ultraviolet/visible spectrometer, a Fourier transforms infrared spectrometer, a transmission electron microscope (TEM), a size analyzer, and a fluorescence spectrophotometer. Furthermore, covalent linking through the azidocarbonyl groups and physical nonspecific attachments of bovine serum albumin (BSA), trypsin, and human chorionic gonadotropin (HCG) onto the surface of the microspheres were also determined to evaluate the influence of improved surface hydrophilicity on nonspecific protein adsorption. Results from the TEM and size analyzer showed that the PSAAFMs maintained spherical shapes with an average diameter of 2.5 ± 0.22 µm. Fluorescence measurement indicated that the maximum emission wavelength underwent a slight blue shift from 514 to 512 nm. Environmental factors, such as pH value, imposed certain effects on fluorescence intensities. The linear relationship between fluorescence intensity and microspheres' concentration, which ranged from 1 × 10−3 to 10 × 10−3 g L−1, suggest their quantitative application. The significant decrease in the physical nonspecific adsorption of BSA, trypsin, and HCG in comparison with the microspheres without improved hydrophilicity suggest the increased amount of acrylamide on the surface of the microspheres. The protein covalent immobilization experiments revealed significant increases in BSA and HCG immobilization in comparison with the nonspecific physical attachment. The combination of high hydrophilicity and electrostatic repulsion could severely inhibit nonspecific protein attachment onto the surface of the microspheres.
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Affiliation(s)
- Xinghua Pan
- Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an, People’s Republic of China
| | - Jianhui Ju
- Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an, People’s Republic of China
| | - Jianjun Li
- Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an, People’s Republic of China
| | - Daocheng Wu
- Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an, People’s Republic of China
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Ji XH, Zhang NG, Cheng W, Guo F, Liu W, Guo SS, He ZK, Zhao XZ. Integrated parallel microfluidic device for simultaneous preparation of multiplex optical-encoded microbeads with distinct quantum dot barcodes. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm12253c] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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