1
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Liu L, Zheng M, Liang R. Improvement of liraglutide release from PLGA microspheres by a porous microsphere-gel composite system. Pharm Dev Technol 2024; 29:291-299. [PMID: 38466377 DOI: 10.1080/10837450.2024.2329763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 03/08/2024] [Indexed: 03/13/2024]
Abstract
In the current work, we aimed to prepare a liraglutide-loaded porous microsphere-gel composite system. By employing polyethylene glycol (PEG) as a porogenic agent and poly (lactic-co-glycolic acid) copolymer (PLGA) as a carrier, the liraglutide microspheres were prepared and dispersed in a temperature-sensitive gel made of poloxamer 407 (F-127) and poloxamer 188 (F-68), which served as the gel matrix, to construct the composite system. The porous microsphere-gel composite system demonstrated prolonged and steady drug release, with a reduction to 4.7% in the initial release within 1 d, according to data from in vitro release tests. The drug release from the porous microspheres decreased from 53% to 29% during the rapid release phase as the PEG concentration increased and the release rate slowed down. In vivo experiments in rats revealed that the composite system prolonged the release period by about 10 d. The pharmacokinetic parameter AUC0-1 was decreased by 24.78 ng/ml*h, the initial burst release was decreased, and the blood drug concentration fluctuation was lessened. The construction of a porous microsphere-gel composite matrix offers a novel approach to the systems with a sustained, long-lasting release that utilizes rational design.
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Affiliation(s)
- Lei Liu
- School of Pharmacy, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Key Laboratory of Molecular Pharmacology and Drug Evaluation(Yantai University), Ministry of Education, Yantai University, Yantai, People's Republic of China
| | - Mingxiu Zheng
- School of Pharmacy, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Key Laboratory of Molecular Pharmacology and Drug Evaluation(Yantai University), Ministry of Education, Yantai University, Yantai, People's Republic of China
| | - Rongcai Liang
- School of Pharmacy, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Key Laboratory of Molecular Pharmacology and Drug Evaluation(Yantai University), Ministry of Education, Yantai University, Yantai, People's Republic of China
- State Key Laboratory of Long-Acting and Targeting Drug Delivery System, Shandong Luye Pharmaceutical Co., Ltd, Yantai, People's Republic of China
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2
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Wang L, Hao F, Tian S, Dong H, Nie J, Ma G. Targeting polysaccharides such as chitosan, cellulose, alginate and starch for designing hemostatic dressings. Carbohydr Polym 2022; 291:119574. [DOI: 10.1016/j.carbpol.2022.119574] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 04/30/2022] [Accepted: 05/03/2022] [Indexed: 12/21/2022]
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3
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Zou H, Lv Y. Synthetic Strategies for Polymer Particles with Surface Concavities. Macromol Rapid Commun 2022; 43:e2200072. [PMID: 35322491 DOI: 10.1002/marc.202200072] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 03/15/2022] [Indexed: 11/06/2022]
Abstract
Over the past decade or so, there has been increasing interest in the synthesis of polymer particles with surface concavities, which mainly include golf ball-like, dimpled and surface-wrinkled polymer particles. Such syntheses generally can be classified into direct polymerization and post-treatment on preformed polymer particles. This review aims to provide an overview of the synthetic strategies of such particles. Some selected examples are given to present the formation mechanisms of the surface concavities. The applications and future development of these concave polymer particles are also briefly discussed. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Hua Zou
- School of Materials and Chemistry, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai, 200093, China
| | - Yongliang Lv
- School of Materials and Chemistry, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai, 200093, China
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4
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Mao X, Wang M, Jin S, Rao J, Deng R, Zhu J. Monodispersed polymer particles with tunable surface structures: Droplet
microfluidic‐assisted
fabrication and biomedical applications. JOURNAL OF POLYMER SCIENCE 2022. [DOI: 10.1002/pol.20210909] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Xi Mao
- State Key Laboratory of Materials Processing and Die & Mould Technology, Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST) Wuhan China
| | - Mian Wang
- State Key Laboratory of Materials Processing and Die & Mould Technology, Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST) Wuhan China
| | - Shaohong Jin
- State Key Laboratory of Materials Processing and Die & Mould Technology, Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST) Wuhan China
| | - Jingyi Rao
- State Key Laboratory of Materials Processing and Die & Mould Technology, Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST) Wuhan China
| | - Renhua Deng
- State Key Laboratory of Materials Processing and Die & Mould Technology, Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST) Wuhan China
| | - Jintao Zhu
- State Key Laboratory of Materials Processing and Die & Mould Technology, Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST) Wuhan China
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5
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Smart gating porous particles as new carriers for drug delivery. Adv Drug Deliv Rev 2021; 174:425-446. [PMID: 33930490 DOI: 10.1016/j.addr.2021.04.023] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 04/12/2021] [Accepted: 04/23/2021] [Indexed: 12/13/2022]
Abstract
The design of smart drug delivery carriers has recently attracted great attention in the biomedical field. Smart carriers can specifically respond to physical and chemical changes in their environment, such as temperature, photoirradiation, ultrasound, magnetic field, pH, redox species, and biomolecules. This review summarizes recent advances in the integration of porous particles and stimuli-responsive gatekeepers for effective drug delivery. Their unique structural properties play an important role in facilitating the diffusion of drug molecules and cell attachment. Various techniques for fabricating porous materials, with their major advantages and limitations, are summarized. Smart gatekeepers provide advanced functions such as "open-close" switching by functionalized stimuli-responsive polymers on a particle's pores. These controlled delivery systems enable drugs to be targeted at specific rates, time programs, and sites of the human body. The gate structures, gating mechanisms, and controlled release mechanisms of each trigger are detailed. Current ongoing research and future trends in targeted drug delivery, tissue engineering, and regenerative medicine applications are highlighted.
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6
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Henshaw CA, Dundas AA, Cuzzucoli Crucitti V, Alexander MR, Wildman R, Rose FRAJ, Irvine DJ, Williams PM. Droplet Microfluidic Optimisation Using Micropipette Characterisation of Bio-Instructive Polymeric Surfactants. Molecules 2021; 26:3302. [PMID: 34072733 PMCID: PMC8197901 DOI: 10.3390/molecules26113302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 05/25/2021] [Accepted: 05/27/2021] [Indexed: 11/24/2022] Open
Abstract
Droplet microfluidics can produce highly tailored microparticles whilst retaining monodispersity. However, these systems often require lengthy optimisation, commonly based on a trial-and-error approach, particularly when using bio-instructive, polymeric surfactants. Here, micropipette manipulation methods were used to optimise the concentration of bespoke polymeric surfactants to produce biodegradable (poly(d,l-lactic acid) (PDLLA)) microparticles with unique, bio-instructive surface chemistries. The effect of these three-dimensional surfactants on the interfacial tension of the system was analysed. It was determined that to provide adequate stabilisation, a low level (0.1% (w/v)) of poly(vinyl acetate-co-alcohol) (PVA) was required. Optimisation of the PVA concentration was informed by micropipette manipulation. As a result, successful, monodisperse particles were produced that maintained the desired bio-instructive surface chemistry.
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Affiliation(s)
- Charlotte A. Henshaw
- Molecular Therapeutics and Formulation, School of Pharmacy, University of Nottingham, Nottingham NG7 2RD, UK;
- Advanced Materials and Healthcare Technologies, School of Pharmacy, University of Nottingham, Nottingham NG7 2RD, UK; (A.A.D.); (M.R.A.)
| | - Adam A. Dundas
- Advanced Materials and Healthcare Technologies, School of Pharmacy, University of Nottingham, Nottingham NG7 2RD, UK; (A.A.D.); (M.R.A.)
- Centre for Additive Manufacturing, Department for Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK; (V.C.C.); (R.W.)
| | - Valentina Cuzzucoli Crucitti
- Centre for Additive Manufacturing, Department for Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK; (V.C.C.); (R.W.)
| | - Morgan R. Alexander
- Advanced Materials and Healthcare Technologies, School of Pharmacy, University of Nottingham, Nottingham NG7 2RD, UK; (A.A.D.); (M.R.A.)
| | - Ricky Wildman
- Centre for Additive Manufacturing, Department for Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK; (V.C.C.); (R.W.)
| | - Felicity R. A. J. Rose
- Regenerative Medicine and Cellular Therapies, School of Pharmacy, University of Nottingham, Nottingham NG7 2RD, UK;
| | - Derek J. Irvine
- Centre for Additive Manufacturing, Department for Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK; (V.C.C.); (R.W.)
| | - Philip M. Williams
- Molecular Therapeutics and Formulation, School of Pharmacy, University of Nottingham, Nottingham NG7 2RD, UK;
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7
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Polymeric non-spherical coarse microparticles fabricated by double emulsion-solvent evaporation for simvastatin delivery. Colloids Surf B Biointerfaces 2021; 199:111560. [DOI: 10.1016/j.colsurfb.2021.111560] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 12/18/2020] [Accepted: 01/03/2021] [Indexed: 01/24/2023]
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8
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Park K, Otte A, Sharifi F, Garner J, Skidmore S, Park H, Jhon YK, Qin B, Wang Y. Formulation composition, manufacturing process, and characterization of poly(lactide-co-glycolide) microparticles. J Control Release 2021; 329:1150-1161. [PMID: 33148404 PMCID: PMC7904638 DOI: 10.1016/j.jconrel.2020.10.044] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 10/16/2020] [Accepted: 10/21/2020] [Indexed: 11/30/2022]
Abstract
Injectable long-acting formulations, specifically poly(lactide-co-glycolide) (PLGA) based systems, have been used to deliver drugs systemically for up to 6 months. Despite the benefits of using this type of long-acting formulations, the development of clinical products and the generic versions of existing formulations has been slow. Only about two dozen formulations have been approved by the U.S. Food and Drug Administration during the last 30 years. Furthermore, less than a dozen small molecules have been incorporated and approved for clinical use in PLGA-based formulations. The limited number of clinically used products is mainly due to the incomplete understanding of PLGA polymers and the various variables involved in the composition and manufacturing process. Numerous process parameters affect the formulation properties, and their intricate interactions have been difficult to decipher. Thus, it is necessary to identify all the factors affecting the final formulation properties and determine the main contributors to enable control of each factor independently. The composition of the formulation and the manufacturing processes determine the essential property of each formulation, i.e., in vivo drug release kinetics leading to their respective pharmacokinetic profiles. Since the pharmacokinetic profiles can be correlated with in vitro release kinetics, proper in vitro characterization is critical for both batch-to-batch quality control and scale-up production. In addition to in vitro release kinetics, other in vitro characterization is essential for ensuring that the desired formulation is produced, resulting in an expected pharmacokinetic profile. This article reviews the effects of a selected number of parameters in the formulation composition, manufacturing process, and characterization of microparticle systems. In particular, the emphasis is focused on the characterization of surface morphology of PLGA microparticles, as it is a manifestation of the formulation composition and the manufacturing process. Also, the implication of the surface morphology on the drug release kinetics is examined. The information described here can also be applied to in situ forming implants and solid implants.
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Affiliation(s)
- Kinam Park
- Purdue University, Biomedical Engineering and Pharmaceutics, 206 S. Martin Jischke Drive, West Lafayette, IN 47907, USA; Akina, Inc., 3495 Kent Avenue, Suite A200, West Lafayette, IN 47906, USA.
| | - Andrew Otte
- Purdue University, Biomedical Engineering and Pharmaceutics, 206 S. Martin Jischke Drive, West Lafayette, IN 47907, USA
| | - Farrokh Sharifi
- Purdue University, Biomedical Engineering and Pharmaceutics, 206 S. Martin Jischke Drive, West Lafayette, IN 47907, USA
| | - John Garner
- Akina, Inc., 3495 Kent Avenue, Suite A200, West Lafayette, IN 47906, USA
| | - Sarah Skidmore
- Akina, Inc., 3495 Kent Avenue, Suite A200, West Lafayette, IN 47906, USA
| | - Haesun Park
- Akina, Inc., 3495 Kent Avenue, Suite A200, West Lafayette, IN 47906, USA
| | - Young Kuk Jhon
- Food and Drug Administration, Center for Drug Evaluation and Research, Office of Pharmaceutical Quality, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA
| | - Bin Qin
- Food and Drug Administration, Center for Drug Evaluation and Research, Office of Generic Drugs, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA
| | - Yan Wang
- Food and Drug Administration, Center for Drug Evaluation and Research, Office of Generic Drugs, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA
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9
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Al Nuumani R, Smoukov SK, Bolognesi G, Vladisavljević GT. Highly Porous Magnetic Janus Microparticles with Asymmetric Surface Topology. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:12702-12711. [PMID: 33105997 DOI: 10.1021/acs.langmuir.0c02315] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Monodispersed magnetic Janus particles composed of a porous polystyrene portion and a nonporous poly(vinyl acetate) portion with embedded oleic acid-coated magnetic nanoparticles were generated using microfluidic emulsification followed by two distinct phase separation events triggered by solvent evaporation. The template droplets were composed of 2 wt % polystyrene, 2 wt % poly(vinyl acetate), and 0.5-2 wt % n-heptane-based magnetic fluid dissolved in dichloromethane (DCM). The porosity of polystyrene compartments was the result of phase separation between a nonvolatile nonsolvent (n-heptane) and a volatile solvent (DCM) within polystyrene-rich phase. The focused ion beam cross-sectioning and scanning electron microscopy (SEM) imaging revealed high surface porosity of polystyrene compartments with negligible porosity of poly(vinyl acetate) parts, which can be exploited to increase the wettability contrast between the two polymers and enhance bubble generation in bubble-driven micromotors. The porosity of the polystyrene portion was controlled by varying the fraction of n-heptane in the dispersed phase. The particle composition was confirmed by scanning electron microscopy-energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, and differential scanning calorimetry. The fabricated particles were successfully magnetized when subjected to an external magnetic field, which led to their aggregation into regular 2D assemblies. The particle clusters composed of two to four individual particles could be rotated with a rotating magnetic field. Microfluidic generation of highly porous Janus particles with compositional, topological, and magnetic asymmetry provides a cost-effective, easy-to-implement yet highly robust and versatile strategy for the manufacturing of multifunctional smart particles.
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Affiliation(s)
- Ruqaiya Al Nuumani
- Department of Chemical Engineering, Loughborough University, Loughborough LE11 3TU, United Kingdom
| | - Stoyan K Smoukov
- School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, United Kingdom
| | - Guido Bolognesi
- Department of Chemical Engineering, Loughborough University, Loughborough LE11 3TU, United Kingdom
| | - Goran T Vladisavljević
- Department of Chemical Engineering, Loughborough University, Loughborough LE11 3TU, United Kingdom
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10
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Liang R, Fang X, Qiu B, Zou H. One-step synthesis of golf ball-like thiol-functionalized silica particles. SOFT MATTER 2020; 16:9113-9120. [PMID: 32914806 DOI: 10.1039/d0sm01214a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
There is increasing interest in the synthesis of golf ball-like particles. Most of the reports on golf ball-like particles have focused on polymer particles, while relatively few are concerned with inorganic particles. In this work, golf ball-like thiol-functionalized silica particles were synthesized for the first time by a one-step sol-gel reaction using 3-mercaptopropyl trimethoxysilane (MPTMS) and tetraethoxysilane (TEOS) as the precursors. The particle growth with time was monitored by SEM and a particle formation mechanism was proposed. The effects of different reaction parameters including the TEOS/MPTMS molar ratio, the NH4OH concentration, and the stirring rate on the morphology and size of the golf ball-like organosilica particles were studied. Given that the thiol groups have versatile functionalities, golf ball-like thiol-functionalized silica particle is a useful model for academic studies.
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Affiliation(s)
- Ruixue Liang
- School of Materials Science and Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China.
| | - Xia Fang
- School of Materials Science and Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China.
| | - Biwei Qiu
- School of Materials Science and Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China.
| | - Hua Zou
- School of Materials Science and Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China.
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11
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Biswal AK, Saha S. Controllable fabrication of biodegradable Janus and multi-layered particles with hierarchically porous structure. J Colloid Interface Sci 2020; 566:120-134. [DOI: 10.1016/j.jcis.2020.01.071] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 01/15/2020] [Accepted: 01/19/2020] [Indexed: 10/25/2022]
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12
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Xi G, Liu W, Chen M, Li Q, Hao X, Wang M, Yang X, Feng Y, He H, Shi C, Li W. Polysaccharide-Based Lotus Seedpod Surface-Like Porous Microsphere with Precise and Controllable Micromorphology for Ultrarapid Hemostasis. ACS APPLIED MATERIALS & INTERFACES 2019; 11:46558-46571. [PMID: 31769962 DOI: 10.1021/acsami.9b17543] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Rapid water absorption rate has become a bottleneck that limits ultrarapid hemostatic performance of hemostatic microspheres. Herein, we reported a "lotus seedpod surface-like" polysaccharide hemostatic microsphere (PHM) with "macropits on surface" morphology and "micropores in macropits" structure. Unique macropits on surface can promote the water absorption rate because they are advantageous to quickly guide blood into the micropores. Special micropores are internally connected with each other, which endows PHM4 with high water absorption ratio. During the process of blood entering the micropores from micropits, the pore size decreases gradually. In this way, blood clotting factors could be rapidly concentrated. PHM4 showed the highest water absorption rate (40.7 mL/s/cm2) and rapid hemostatic property in vivo (hemostatic time shortened from 210 to 45 s). Lotus seedpod surface-like PHMs are believed to have further clinical application as an effective hemostasis.
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Affiliation(s)
- Guanghui Xi
- School of Ophthalmology & Optometry, Eye Hospital, School of Biomedical Engineering , Wenzhou Medical University , Wenzhou , Zhejiang 325027 , China
- Wenzhou Institute of Biomaterials and Engineering, Wenzhou Institute , University of Chinese Academy of Sciences , Wenzhou , Zhejiang 325011 , China
| | - Wen Liu
- School of Ophthalmology & Optometry, Eye Hospital, School of Biomedical Engineering , Wenzhou Medical University , Wenzhou , Zhejiang 325027 , China
- Wenzhou Institute of Biomaterials and Engineering, Wenzhou Institute , University of Chinese Academy of Sciences , Wenzhou , Zhejiang 325011 , China
| | - Miao Chen
- School of Ophthalmology & Optometry, Eye Hospital, School of Biomedical Engineering , Wenzhou Medical University , Wenzhou , Zhejiang 325027 , China
| | - Qian Li
- Department of Biomedical Sciences , Texas A&M University College of Dentistry , Dallas , Texas 75246 , United States
| | - Xiao Hao
- Cardiovascular Division 1 , Hebei General Hospital , Shijiazhuang , Hebei 050051 , China
| | - Mingshan Wang
- The First Affiliated Hospital of Wenzhou Medical University , Wenzhou Medical University , Wenzhou , Zhejiang 325000 , China
| | - Xiao Yang
- School of Chemical Engineering and Technology , Tianjin University , Tianjin 300350 , China
| | - Yakai Feng
- School of Chemical Engineering and Technology , Tianjin University , Tianjin 300350 , China
| | - Hongchao He
- Department of Urology , Shanghai Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine , Shanghai 200025 , China
| | - Changcan Shi
- School of Ophthalmology & Optometry, Eye Hospital, School of Biomedical Engineering , Wenzhou Medical University , Wenzhou , Zhejiang 325027 , China
- Wenzhou Institute of Biomaterials and Engineering, Wenzhou Institute , University of Chinese Academy of Sciences , Wenzhou , Zhejiang 325011 , China
| | - Wenzhong Li
- Institute of Chemistry and Biochemistry , Free University of Berlin , Takustrasse 3 , Berlin 14195 , Germany
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13
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Efficient and prolonged antibacterial activity from porous PLGA microparticles and their application in food preservation. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 108:110496. [PMID: 31923956 DOI: 10.1016/j.msec.2019.110496] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Revised: 05/14/2019] [Accepted: 11/26/2019] [Indexed: 12/28/2022]
Abstract
Simple addition of a minute quantity of non-toxic mustard oil in water/oil/water (W/O/W) double emulsion led to a porous morphology at the surface as well as in the interior of the biodegradable PLGA (Poly(l-lactide-co-glycolide)) microparticles. An attempt was made to understand the mechanism of pore formation by analyzing optical micrographs and SEM images in addition to solution viscosity of organic phase and interfacial tension values between organic and aqueous phases. The origin of surface porosity was thought to come from the inclusion of inner water droplet, stabilized by heteroaggregation of mustard oil and PLGA chains along with PVA (polyvinyl alcohol), to the solidifying polymer skin. The surface pores did not arise in absence of mustard oil. The encapsulation and release of antibacterial active (benzoic acid) from porous PLGA particles was studied in PBS buffer (pH 7) at 37 °C for 60 days. The release profiles were well-controlled in nature, and found to be influenced by surface porosity of the particles that can be manipulated by varying the amount of mustard oil. The release mechanism can well be explained with the help of power law model. Strikingly, in liquid medium, porous particles were found completely suppressing the growth of Escherichia coli and Staphylococcus aureus for a prolonged period of 60 days. The strong antimicrobial activity (100% inhibition of bacterial growth) in porous particles can be linked to the enhanced surface area due to the formation of micro/nano pores which accelerate the hydrolytic degradation of PLGA to release lactic acid/glycolic acid (antibacterial) in addition to encapsulated antibacterial (benzoic acid). In a food model system, the shelf life of the water melon juice was also found to be enhanced by suppressing the growth of the natural microbes in comparison to control.
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14
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Zhu C, Yang H, Shen L, Zheng Z, Zhao S, Li Q, Yu F, Cen L. Microfluidic preparation of PLGA microspheres as cell carriers with sustainable Rapa release. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2019; 30:737-755. [DOI: 10.1080/09205063.2019.1602930] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Chengcheng Zhu
- Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, State Key Laboratory of Chemical Engineering, Department of Product Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China
| | - Haibo Yang
- Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, State Key Laboratory of Chemical Engineering, Department of Product Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China
| | - Liang Shen
- Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, State Key Laboratory of Chemical Engineering, Department of Product Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China
| | - Zhuoyuan Zheng
- Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, State Key Laboratory of Chemical Engineering, Department of Product Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China
| | - Shicheng Zhao
- Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, State Key Laboratory of Chemical Engineering, Department of Product Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China
| | - Qingguo Li
- School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Fengbin Yu
- Department of Orthopaedic Surgery, No. 98 Hospital of PLA, Huzhou, China
| | - Lian Cen
- Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, State Key Laboratory of Chemical Engineering, Department of Product Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China
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15
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Poly(lactic-co-glycolic acid)(PLGA)/TiO 2 nanotube bioactive composite as a novel scaffold for bone tissue engineering: In vitro and in vivo studies. Biologicals 2018; 53:51-62. [PMID: 29503205 DOI: 10.1016/j.biologicals.2018.02.004] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Revised: 02/05/2018] [Accepted: 02/26/2018] [Indexed: 11/20/2022] Open
Abstract
The aim of this study was to synthesize and characterize novel three-dimensional porous scaffolds made of poly (lactic-co-glycolic acid)/TiO2 nanotube (TNT) composite microspheres for bone tissue engineering applications. The incorporation of TNT greatly increases mechanical properties of PLGA/TNT microsphere-sintered scaffold. The experimental results exhibit that the PLGA/0.5 wt% TNT scaffold sintered at 100 °C for 3 h showed the best mechanical properties and a proper pore structure for tissue engineering. Biodegradation test ascertained that the weight of both PLGA and PLGA/PLGA/0.5 wt% TiO2 nanotube composites slightly reduced during the first 4 weeks following immersion in SBF solution. Moreover, the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) assay and alkaline phosphatase activity (ALP activity) results represent increased cell viability for PLGA/0.5%TNT composite scaffold in comparison to the control group. In vivo studies show the amount of bone formation for PLGA/TNT was approximately twice of pure PLGA. Vivid histologic images of the newly generated bone on the implants further supported our test results. Eventually, a mathematical model showed that both PLGA and PLGA/TNT scaffolds' mechanical properties follow an exponential trend with time as their degradation occurs. By a three-dimensional finite element model, a more monotonous distribution of stress was present in the scaffold due to the presence of TNT with a reduction in maximum stress on bone.
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16
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Silk fibroin-coated PLGA dimpled microspheres for retarded release of simvastatin. Colloids Surf B Biointerfaces 2017; 158:112-118. [DOI: 10.1016/j.colsurfb.2017.06.038] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 06/05/2017] [Accepted: 06/22/2017] [Indexed: 12/30/2022]
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17
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Wang B, Prinsen P, Wang H, Bai Z, Wang H, Luque R, Xuan J. Macroporous materials: microfluidic fabrication, functionalization and applications. Chem Soc Rev 2017; 46:855-914. [DOI: 10.1039/c5cs00065c] [Citation(s) in RCA: 106] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
This article provides an up-to-date highly comprehensive overview (594 references) on the state of the art of the synthesis and design of macroporous materials using microfluidics and their applications in different fields.
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Affiliation(s)
- Bingjie Wang
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process
- School of Mechanical and Power Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Pepijn Prinsen
- Departamento de Quimica Organica
- Universidad de Cordoba
- Campus de Rabanales
- Cordoba
- Spain
| | - Huizhi Wang
- School of Engineering and Physical Sciences
- Heriot-Watt University
- Edinburgh
- UK
| | - Zhishan Bai
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process
- School of Mechanical and Power Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Hualin Wang
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process
- School of Mechanical and Power Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Rafael Luque
- Departamento de Quimica Organica
- Universidad de Cordoba
- Campus de Rabanales
- Cordoba
- Spain
| | - Jin Xuan
- School of Engineering and Physical Sciences
- Heriot-Watt University
- Edinburgh
- UK
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18
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Kim SW, Lee SW, Kim J, Yim JH, Cho KY. Three-dimensional, high-porosity conducting skeletal structure from biodegradable microparticles with vapor-phase polymerized conformal surface layer. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.09.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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19
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Salvador-Morales C, Brahmbhatt B, Márquez-Miranda V, Araya-Duran I, Canan J, Gonzalez-Nilo F, Vilos C, Cebral J, Mut F, Lohner R, Leong B, Sundaresan G, Zweit J. Mechanistic Studies on the Self-Assembly of PLGA Patchy Particles and Their Potential Applications in Biomedical Imaging. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:7929-7942. [PMID: 27468612 DOI: 10.1021/acs.langmuir.6b02177] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Currently, several challenges prevent poly(lactic-co-glycolic acid) (PLGA) particles from reaching clinical settings. Among these is a lack of understanding of the molecular mechanisms involved in the formation of these particles. We have been studying in depth the formation of patchy polymeric particles. These particles are made of PLGA and lipid-polymer functional groups. They have unique patch-core-shell structural features: hollow or solid hydrophobic cores and a patchy surface. Previously, we identified the shear stress as the most important parameter in a patchy particle's formation. Here, we investigated in detail the role of shear stress in the patchy particle's internal and external structure using an integrative experimental and computational approach. By cross-sectioning the multipatch particles, we found lipid-based structures embedded in the entire PLGA matrix, which represents a unique finding in the PLGA field. By developing novel computational fluid dynamics and molecular dynamics simulations, we found that the shear stress determines the internal structure of the patchy particles. Equally important, we discovered that these particles emit a photoacoustic (PA) signal in the optical clinical imaging window. Our results show that particles with multiple patches emit a higher PA signal than single-patch particles. This phenomenon most likely is due to the fact that multipatchy particles absorb more heat than single-patchy particles as shown by differential scanning calorimetry analysis. Furthermore, we demonstrated the use of patchy polymeric particles as photoacoustic molecular probes both in vitro and in vivo studies. The fundamental studies described here will help us to design more effective PLGA carriers for a number of medical applications as well as to accelerate their medical translation.
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Affiliation(s)
- C Salvador-Morales
- Bioengineering Department, George Mason University , 4400 University Drive, MS 1G5, Fairfax, Virginia 22030, United States
- Krasnow Institute for Advanced Study, George Mason University , 4400 University Drive, MS 2A1, Fairfax, Virginia 22030, United States
| | - Binal Brahmbhatt
- Bioengineering Department, George Mason University , 4400 University Drive, MS 1G5, Fairfax, Virginia 22030, United States
- Krasnow Institute for Advanced Study, George Mason University , 4400 University Drive, MS 2A1, Fairfax, Virginia 22030, United States
| | - V Márquez-Miranda
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias Biologicas, Universidad Andres Bello , Santiago, Chile 8370146
| | - I Araya-Duran
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias Biologicas, Universidad Andres Bello , Santiago, Chile 8370146
| | - J Canan
- Fundación Fraunhofer Chile Research , M. Sanchez Fontecilla 310, Las Condes, Chile 7550296
| | - F Gonzalez-Nilo
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias Biologicas, Universidad Andres Bello , Santiago, Chile 8370146
| | - C Vilos
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias Biologicas, Universidad Andres Bello , Santiago, Chile 8370146
- Center for Integrative Medicine and Innovative Science, Faculty of Medicine, Universidad Andres Bello , Santiago, Chile 8370146
| | - J Cebral
- Bioengineering Department, George Mason University , 4400 University Drive, MS 1G5, Fairfax, Virginia 22030, United States
- Krasnow Institute for Advanced Study, George Mason University , 4400 University Drive, MS 2A1, Fairfax, Virginia 22030, United States
| | - F Mut
- Bioengineering Department, George Mason University , 4400 University Drive, MS 1G5, Fairfax, Virginia 22030, United States
- Krasnow Institute for Advanced Study, George Mason University , 4400 University Drive, MS 2A1, Fairfax, Virginia 22030, United States
| | - R Lohner
- Center for Computational Fluid Dynamics, College of Sciences, George Mason University , Fairfax, Virginia 22030, United States
| | - B Leong
- Center for Molecular Imaging, Department of Radiology, Virginia Commonwealth University , Richmond, Virginia 23298, United States
| | - G Sundaresan
- Center for Molecular Imaging, Department of Radiology, Virginia Commonwealth University , Richmond, Virginia 23298, United States
| | - J Zweit
- Center for Molecular Imaging, Department of Radiology, Virginia Commonwealth University , Richmond, Virginia 23298, United States
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20
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Kim Y, Kim H, Sah H. Methylamine acts as excellent chemical trigger to Harden emulsion droplets into spongy PLGA microspheres. RSC Adv 2016. [DOI: 10.1039/c6ra17576g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A unique approach using methylamine as a chemical trigger leads to the formation of sponge-like PLGA microspheres with extreme porosity.
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Affiliation(s)
- Yuyoung Kim
- College of Pharmacy
- Ewha Womans University
- Sedaemun-gu
- Republic of Korea
| | - Hansol Kim
- College of Pharmacy
- Ewha Womans University
- Sedaemun-gu
- Republic of Korea
| | - Hongkee Sah
- College of Pharmacy
- Ewha Womans University
- Sedaemun-gu
- Republic of Korea
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21
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Tuning Microparticle Porosity during Single Needle Electrospraying Synthesis via a Non-Solvent-Based Physicochemical Approach. Polymers (Basel) 2015. [DOI: 10.3390/polym7121531] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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22
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Ekanem EE, Nabavi SA, Vladisavljević GT, Gu S. Structured Biodegradable Polymeric Microparticles for Drug Delivery Produced Using Flow Focusing Glass Microfluidic Devices. ACS APPLIED MATERIALS & INTERFACES 2015; 7:23132-23143. [PMID: 26423218 DOI: 10.1021/acsami.5b06943] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Biodegradable poly(DL-lactic acid) (PLA) and poly(lactic-co-glycolic acid) (PLGA) microparticles with tunable size, shape, internal structure and surface morphology were produced by counter-current flow focusing in axisymmetric (3D) glass capillary devices. The dispersed phase was composed of 0.5-2 wt % polymer solution in a volatile organic solvent (ethyl acetate or dichloromethane) and the continuous phase was 5 wt % aqueous poly(vinyl alcohol) solution. The droplets with a coefficient of variation in dripping regime below 2.5% were evaporated to form polymeric particles with uniform sizes ranging between 4 and 30 μm. The particle microstructure and surface roughness were modified by adding nanofiller (montmorillonite nanoclay) or porogen (2-methylpentane) in the dispersed phase to form less porous polymer matrix or porous particles with golf-ball-like dimpled surface, respectively. The presence of 2-4 wt % nanoclay in the host polymer significantly reduced the release rate of paracetamol and prevented the early burst release, as a result of reduced polymer porosity and tortuous path for the diffusing drug molecules. Numerical modeling results using the volume of fluid-continuum surface force model agreed well with experimental behavior and revealed trapping of nanoclay particles in the dispersed phase upstream of the orifice at low dispersed phase flow rates and for 4 wt % nanoclay content, due to vortex formation. Janus PLA/PCL (polycaprolactone) particles were produced by solvent evaporation-induced phase separation within organic phase droplets containing 3% (v/v) PLA/PCL (30/70 or 70/30) mixture in dichloromethane. A strong preferential adsorption of Rhodamine 6G dye onto PLA was utilized to identify PLA portions of the Janus particles by confocal laser scanning microscopy (CLSM). Uniform hemispherical PCL particles were produced by dissolution of PLA domes with acetone.
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Affiliation(s)
- Ekanem E Ekanem
- Department of Chemical Engineering, Loughborough University , Loughborough, LE11 3TU, United Kingdom
| | - Seyed Ali Nabavi
- School of Energy, Environment & Agrifood (SEEA), Department of Offshore, Process & Energy Engineering, Cranfield University , Cranfield, MK43 0AL, United Kingdom
| | - Goran T Vladisavljević
- Department of Chemical Engineering, Loughborough University , Loughborough, LE11 3TU, United Kingdom
| | - Sai Gu
- Department of Chemical and Process Engineering, Faculty of Engineering and Physical Sciences, University of Surrey , Guildford, GU2 7XH, United Kingdom
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23
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Fabrication of porous polymer microspheres by tuning amphiphilicity of the polymer and emulsion–solvent evaporation processing. Eur Polym J 2015. [DOI: 10.1016/j.eurpolymj.2015.05.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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24
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Rasheed N, Khorasani AA, Cebral J, Mut F, Löhner R, Salvador-Morales C. Mechanisms Involved in the Formation of Biocompatible Lipid Polymeric Hollow Patchy Particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:6639-6648. [PMID: 26057588 DOI: 10.1021/acs.langmuir.5b01551] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Patchy polymeric particles have anisotropic surface domains that can be remarkably useful in diverse medical and industrial fields because of their ability to simultaneously present two different surface chemistries on the same construct. In this article, we report the mechanisms involved in the formation of novel lipid-polymeric hollow patchy particles during their synthesis. By cross-sectioning the patchy particles, we found that a phase segregation phenomenon occurs between the core, shell, and patch. Importantly, we found that the shear stress that the polymer blend undergoes during the particle synthesis is the most important parameter for the formation of these patchy particles. In addition, we found that the interplay of solvent-solvent, polymer-solvent, and polymer-polymer-solvent interactions generates particles with different surface morphologies. Understanding the mechanisms involved in the formation of patchy particles allows us to have a better control on their physicochemical properties. Therefore, these fundamental studies are critical to achieve batch control and scalability, which are essential aspects that must be addressed in any type of particle synthesis to be safely used in medicine.
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Affiliation(s)
- Nashaat Rasheed
- †Bioengineering Department, ‡Krasnow Institute for Advanced Study, §Department of Chemistry and Biochemistry, and ∥Center for Computational Fluid Dynamics, College of Sciences, George Mason University, Fairfax, Virginia 22030, United States
| | - Ali A Khorasani
- †Bioengineering Department, ‡Krasnow Institute for Advanced Study, §Department of Chemistry and Biochemistry, and ∥Center for Computational Fluid Dynamics, College of Sciences, George Mason University, Fairfax, Virginia 22030, United States
| | - Juan Cebral
- †Bioengineering Department, ‡Krasnow Institute for Advanced Study, §Department of Chemistry and Biochemistry, and ∥Center for Computational Fluid Dynamics, College of Sciences, George Mason University, Fairfax, Virginia 22030, United States
| | - Fernando Mut
- †Bioengineering Department, ‡Krasnow Institute for Advanced Study, §Department of Chemistry and Biochemistry, and ∥Center for Computational Fluid Dynamics, College of Sciences, George Mason University, Fairfax, Virginia 22030, United States
| | - Rainald Löhner
- †Bioengineering Department, ‡Krasnow Institute for Advanced Study, §Department of Chemistry and Biochemistry, and ∥Center for Computational Fluid Dynamics, College of Sciences, George Mason University, Fairfax, Virginia 22030, United States
| | - Carolina Salvador-Morales
- †Bioengineering Department, ‡Krasnow Institute for Advanced Study, §Department of Chemistry and Biochemistry, and ∥Center for Computational Fluid Dynamics, College of Sciences, George Mason University, Fairfax, Virginia 22030, United States
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25
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Chen C, Zhao B, Deng J. Optically Active Porous Microspheres Consisting of Helical Substituted Polyacetylene Prepared by Precipitation Polymerization without Porogen and the Application in Enantioselective Crystallization. ACS Macro Lett 2015; 4:348-352. [PMID: 35596319 DOI: 10.1021/acsmacrolett.5b00088] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A novel chiral acetylenic monomer derived from cholic acid was synthesized and structurally characterized. The monomer underwent precipitation polymerization in tetrahydrofuran/n-heptane mixed solvent with [Rh(nbd)Cl]2 as catalyst. Without adding porogen, porous microspheres were successfully prepared in a high yield (>80 wt %). The formation mechanism of the porous structure was proposed. Circular dichroism and UV-vis absorption spectra demonstrated that the porous microspheres possessed optical activity. The optical activity was originated in the chiral helical conformations of substituted polyacetylene forming the microspheres. The porous microspheres were further used as specific chiral additive to induce enantioselective crystallization of racemic BOC-alanine, in which BOC-l-alanine was preferentially induced forming rod-like crystals with e.e. of 69%. This strongly indicates the significant potential applications of the porous microspheres in chiral technologies. The present study also provides a new approach to prepare chiral porous polymer microspheres.
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Affiliation(s)
- Chunni Chen
- State Key Laboratory of Chemical Resource Engineering and ‡College of Materials
Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Biao Zhao
- State Key Laboratory of Chemical Resource Engineering and ‡College of Materials
Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Jianping Deng
- State Key Laboratory of Chemical Resource Engineering and ‡College of Materials
Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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26
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Wang A, Liang R, Liu W, Sha C, Li Y, Sun K. Effect of palmitic acid on the characteristics and release profiles of rotigotine-loaded microspheres. Pharm Dev Technol 2015; 21:3-7. [DOI: 10.3109/10837450.2015.1011662] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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27
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The controllable preparation of porous PLGA microspheres by the oil/water emulsion method and its application in 3D culture of ovarian cancer cells. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.03.085] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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28
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Fan JB, Song Y, Wang S, Jiang L, Zhu MQ, Guo X. A synergy effect between the hydrophilic PEG and rapid solvent evaporation induced formation of tunable porous microspheres from a triblock copolymer. RSC Adv 2014. [DOI: 10.1039/c3ra44197k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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29
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Golf ball-like particles fabricated by nonsolvent/solvent-induced phase separation method. J Colloid Interface Sci 2013; 391:168-71. [DOI: 10.1016/j.jcis.2012.07.097] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2012] [Revised: 07/08/2012] [Accepted: 07/22/2012] [Indexed: 11/22/2022]
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30
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Kim MR, Lim YT, Cho KY. Biodegradable Microparticles with Surface Dimples as a Bi-Modal Imaging Contrast Agent. Macromol Rapid Commun 2013; 34:406-10. [DOI: 10.1002/marc.201200729] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Revised: 12/13/2012] [Indexed: 11/10/2022]
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31
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Fan JB, Huang C, Jiang L, Wang S. Nanoporous microspheres: from controllable synthesis to healthcare applications. J Mater Chem B 2013; 1:2222-2235. [DOI: 10.1039/c3tb00021d] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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32
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Ge Z, Li C, Heng BC, Cao G, Yang Z. Functional biomaterials for cartilage regeneration. J Biomed Mater Res A 2012; 100:2526-36. [PMID: 22492677 DOI: 10.1002/jbm.a.34147] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Revised: 01/30/2012] [Accepted: 02/19/2012] [Indexed: 12/22/2022]
Abstract
The injury and degeneration of articular cartilage and associated arthritis are leading causes of disability worldwide. Cartilage tissue engineering as a treatment modality for cartilage defects has been investigated for over 20 years. Various scaffold materials have been developed for this purpose, but has yet to achieve feasibility and effectiveness for widespread clinical use. Currently, the regeneration of articular cartilage remains a formidable challenge, due to the complex physiology of cartilage tissue and its poor healing capacity. Although intensive research has been focused on the developmental biology and regeneration of cartilage tissue and a diverse plethora of biomaterials have been developed for this purpose, cartilage regeneration is still suboptimal, such as lacking a layered structure, mechanical mismatch with native cartilage and inadequate integration between native tissue and implanted scaffold. The ideal scaffold material should have versatile properties that actively contribute to cartilage regeneration. Functional scaffold materials may overcome the various challenges faced in cartilage tissue engineering by providing essential biological, mechanical, and physical/chemical signaling cues through innovative design. This review thus focuses on the complex structure of native articular cartilage, the critical properties of scaffolds required for cartilage regeneration, present strategies for scaffold design, and future directions for cartilage regeneration with functional scaffold materials.
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Affiliation(s)
- Zigang Ge
- Department of Biomedical Engineering, College of Engineering, Peking University, Beijing 100871, People's Republic of China.
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33
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Key techniques to control porous microsphere morphology in S/O/W emulsion system. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2010.10.049] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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