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van der Kooij RS, Steendam R, Frijlink HW, Hinrichs WLJ. An overview of the production methods for core-shell microspheres for parenteral controlled drug delivery. Eur J Pharm Biopharm 2021; 170:24-42. [PMID: 34861359 DOI: 10.1016/j.ejpb.2021.11.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 10/19/2021] [Accepted: 11/26/2021] [Indexed: 01/25/2023]
Abstract
Core-shell microspheres hold great promise as a drug delivery system because they offer several benefits over monolithic microspheres in terms of release kinetics, for instance a reduced initial burst release, the possibility of delayed (pulsatile) release, and the possibility of dual-drug release. Also, the encapsulation efficiency can significantly be improved. Various methods have proven to be successful in producing these core-shell microspheres, both the conventional bulk emulsion solvent evaporation method and methods in which the microspheres are produced drop by drop. The latter have become increasingly popular because they provide improved control over the particle characteristics. This review assesses various production methods for core-shell microspheres and summarizes the characteristics of formulations prepared by the different methods, with a focus on their release kinetics.
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Affiliation(s)
- Renée S van der Kooij
- Department of Pharmaceutical Technology and Biopharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Rob Steendam
- InnoCore Pharmaceuticals, L.J. Zielstraweg 1, 9713 GX Groningen, The Netherlands
| | - Henderik W Frijlink
- Department of Pharmaceutical Technology and Biopharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Wouter L J Hinrichs
- Department of Pharmaceutical Technology and Biopharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
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Cardoso MM, Peca IN, Lopes T, Gardner R, Bicho A. Double-Walled Poly-(D,L-lactide-co-glycolide) (PLGA) and Poly(L-lactide) (PLLA) Nanoparticles for the Sustained Release of Doxorubicin. Polymers (Basel) 2021; 13:polym13193230. [PMID: 34641046 PMCID: PMC8512961 DOI: 10.3390/polym13193230] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/17/2021] [Accepted: 09/19/2021] [Indexed: 11/16/2022] Open
Abstract
Double-walled nanoparticles (DWNPs), containing doxorubicin as a model drug, were produced using poly-(D,L-lactide-co-glycolide) (PLGA) and poly(L-lactide) (PLLA) by the solvent evaporation technique. Double-walled microparticles containing doxorubicin were also produced to make possible the examination of the inner morphology and drug distribution using optical and fluorescence microscopy. The produced microparticles present a double-walled structure with doxorubicin solubilized in the PLGA-rich phase. The DWNPs produced present very low initial burst values and a sustained DOX release for at least 90 days with release rates decreasing with the increase in the PLLA amount. Zero-order release kinetics were obtained after day 15. The results support that the PLLA layer acts as a rate control barrier and that the diffusion of doxorubicin from the drug-loaded inner PLGA core can be retarded by an increase in the thickness of the unloaded outer layer. The unloaded double-walled nanoparticles produced were used in in vitro tests with CHO cells and demonstrate that they are nontoxic, while the double-walled nanoparticles loaded with doxorubicin caused a great cellular viability and decreased when tested in vitro.
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Affiliation(s)
- M. Margarida Cardoso
- LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Quinta da Torre, 2829-516 Caparica, Portugal;
- Correspondence: ; Tel.: +351-212-948385
| | - Inês N. Peca
- LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Quinta da Torre, 2829-516 Caparica, Portugal;
| | - Telma Lopes
- Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, 2780-156 Oeiras, Portugal; (T.L.); (R.G.); (A.B.)
| | - Rui Gardner
- Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, 2780-156 Oeiras, Portugal; (T.L.); (R.G.); (A.B.)
| | - A. Bicho
- Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, 2780-156 Oeiras, Portugal; (T.L.); (R.G.); (A.B.)
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Zabihi S, Khoshmaram A, Pishnamazi M, Borousan F, Hezave AZ, Marjani A, Pelalak R, Kurniawan TA, Shirazian S. Thermodynamic study on solubility of brain tumor drug in supercritical solvent: Temozolomide case study. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114926] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Biswal AK, Saha S. New insight into the mechanism of formation of dual actives loaded multilayered polymeric particles and their application in food preservation. J Appl Polym Sci 2019. [DOI: 10.1002/app.48009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Agni Kumar Biswal
- Department of Materials Science and EngineeringIndian Institute of Technology Delhi Delhi 110016 India
| | - Sampa Saha
- Department of Materials Science and EngineeringIndian Institute of Technology Delhi Delhi 110016 India
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Lim YGJ, Poh KCW, Loo SCJ. Hybrid Janus Microparticles Achieving Selective Encapsulation for Theranostic Applications via a Facile Solvent Emulsion Method. Macromol Rapid Commun 2018; 40:e1800801. [DOI: 10.1002/marc.201800801] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 12/07/2018] [Indexed: 12/20/2022]
Affiliation(s)
- Yi Guang Jerome Lim
- School of Materials Science and EngineeringNanyang Technological University 50 Nanyang Avenue Singapore 639798
| | - Kwok Choon Wilson Poh
- School of Materials Science and EngineeringNanyang Technological University 50 Nanyang Avenue Singapore 639798
| | - Say Chye Joachim Loo
- School of Materials Science and EngineeringNanyang Technological University 50 Nanyang Avenue Singapore 639798
- Singapore Centre on Environmental Life Sciences EngineeringNanyang Technological University Singapore 637551
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Davoodi P, Lee LY, Xu Q, Sunil V, Sun Y, Soh S, Wang CH. Drug delivery systems for programmed and on-demand release. Adv Drug Deliv Rev 2018; 132:104-138. [PMID: 30415656 DOI: 10.1016/j.addr.2018.07.002] [Citation(s) in RCA: 170] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 05/25/2018] [Accepted: 07/02/2018] [Indexed: 01/06/2023]
Abstract
With the advancement in medical science and understanding the importance of biodistribution and pharmacokinetics of therapeutic agents, modern drug delivery research strives to utilize novel materials and fabrication technologies for the preparation of robust drug delivery systems to combat acute and chronic diseases. Compared to traditional drug carriers, which could only control the release of the agents in a monotonic manner, the new drug carriers are able to provide a precise control over the release time and the quantity of drug introduced into the patient's body. To achieve this goal, scientists have introduced "programmed" and "on-demand" approaches. The former provides delivery systems with a sophisticated architecture to precisely tune the release rate for a definite time period, while the latter includes systems directly controlled by an operator/practitioner, perhaps with a remote device triggering/affecting the implanted or injected drug carrier. Ideally, such devices can determine flexible release pattern and intensify the efficacy of a therapy via controlling time, duration, dosage, and location of drug release in a predictable, repeatable, and reliable manner. This review sheds light on the past and current techniques available for fabricating and remotely controlling drug delivery systems and addresses the application of new technologies (e.g. 3D printing) in this field.
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Azagury A, Fonseca VC, Cho DY, Perez-Rogers J, Baker CM, Steranka E, Goldenshtein V, Calvao D, Darling EM, Mathiowitz E. Single Step Double-walled Nanoencapsulation (SSDN). J Control Release 2018; 280:11-9. [PMID: 29729351 DOI: 10.1016/j.jconrel.2018.04.048] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 04/28/2018] [Indexed: 12/20/2022]
Abstract
A quick fabrication method for making double-walled (DW) polymeric nanospheres is presented. The process uses sequential precipitation of two polymers. By choosing an appropriate solvent and non-solvent polymer pair, and engineering two sequential phase inversions which induces first precipitation of the core polymer followed by precipitation of the shell polymer, DW nanospheres can be created instantaneously. A series of DW formulations were prepared with various core and shell polymers, then characterized using laser diffraction particle sizing, scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, and differential scanning calorimetry (DSC). Atomic force microscopy (AFM) imaging confirmed existence of a single core polymer coated with a second polymer. Insulin (3.3% loading) was used as a model drug to assess its release profile from core (PLGA) and shell (PBMAD) polymers and resulted with a tri-phase release profile in vitro for two months. Current approaches for producing DW nanoparticles (NPs) are limited by the complexity and time involved. Additional issues include aggregation and entrapment of multiple spheres and the undesired formation of heterogeneous coatings. Therefore, the technique presented here is advantageous because it can produce NPs with distinct, core-shell morphologies through a rapid, spontaneous, self-assembly process. This method not only produces DW NPs, but can also be used to encapsulate therapeutic drug. Furthermore, modification of this process to other core and shell polymers is feasible using the general guidelines provided in this paper.
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Bee SL, Hamid ZAA, Mariatti M, Yahaya BH, Lim K, Bee ST, Sin LT. Approaches to Improve Therapeutic Efficacy of Biodegradable PLA/PLGA Microspheres: A Review. POLYM REV 2018. [DOI: 10.1080/15583724.2018.1437547] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Soo-Ling Bee
- School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Penang, Malaysia
| | - Z. A. Abdul Hamid
- School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Penang, Malaysia
| | - M. Mariatti
- School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Penang, Malaysia
| | - B. H. Yahaya
- Regenerative Medicine Cluster, Advanced Medical and Dental Institute, Universiti Sains Malaysia, Penang, Malaysia
| | - Keemi Lim
- School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Penang, Malaysia
| | - Soo-Tueen Bee
- Department of Chemical Engineering, Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Jalan Sungai Long, Bandar Sungai Long, Cheras, Kajang, Selangor, Malaysia
| | - Lee Tin Sin
- Department of Chemical Engineering, Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Jalan Sungai Long, Bandar Sungai Long, Cheras, Kajang, Selangor, Malaysia
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Ansary RH, Rahman MM, Mohamad N, Arrif TM, Latif AZA, Katas H, Nik WSBW, Awang MB. Controlled Release of Lysozyme from Double-Walled Poly(Lactide-Co-Glycolide) (PLGA) Microspheres. Polymers (Basel) 2017; 9:E485. [PMID: 30965787 PMCID: PMC6418743 DOI: 10.3390/polym9100485] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 09/28/2017] [Accepted: 09/28/2017] [Indexed: 12/11/2022] Open
Abstract
Double-walled microspheres based on poly(lactide-co-glycolide) (PLGA) are potential delivery systems for reducing a very high initial burst release of encapsulated protein and peptide drugs. In this study, double-walled microspheres made of glucose core, hydroxyl-terminated poly(lactide-co-glycolide) (Glu-PLGA), and carboxyl-terminated PLGA were fabricated using a modified water-in-oil-in-oil-in-water (w1/o/o/w2) emulsion solvent evaporation technique for the controlled release of a model protein, lysozyme. Microspheres size, morphology, encapsulation efficiency, lysozyme in vitro release profiles, bioactivity, and structural integrity, were evaluated. Scanning electron microscopy (SEM) images revealed that double-walled microspheres comprising of Glu-PLGA and PLGA with a mass ratio of 1:1 have a spherical shape and smooth surfaces. A statistically significant increase in the encapsulation efficiency (82.52% ± 3.28%) was achieved when 1% (w/v) polyvinyl alcohol (PVA) and 2.5% (w/v) trehalose were incorporated in the internal and external aqueous phase, respectively, during emulsification. Double-walled microspheres prepared together with excipients (PVA and trehalose) showed a better control release of lysozyme. The released lysozyme was fully bioactive, and its structural integrity was slightly affected during microspheres fabrication and in vitro release studies. Therefore, double-walled microspheres made of Glu-PLGA and PLGA together with excipients (PVA and trehalose) provide a controlled and sustained release for lysozyme.
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Affiliation(s)
- Rezaul H Ansary
- Faculty of Pharmacy, International Islamic University Malaysia, Kuantan 25200, Malaysia.
- Department of Chemistry, University of Rajshahi, Rajshahi 6205, Bangladesh.
| | - Mokhlesur M Rahman
- Faculty of Pharmacy, International Islamic University Malaysia, Kuantan 25200, Malaysia.
- Institute for Community Development & Quality of Life (i-CODE), Universiti Sultan Zainal Abidin, Kuala Nerus 21300, Terengganu, Malaysia.
| | - Nasir Mohamad
- Institute for Community Development & Quality of Life (i-CODE), Universiti Sultan Zainal Abidin, Kuala Nerus 21300, Terengganu, Malaysia.
| | - Tengku M Arrif
- Institute for Community Development & Quality of Life (i-CODE), Universiti Sultan Zainal Abidin, Kuala Nerus 21300, Terengganu, Malaysia.
| | - Ahmad Zubaidi A Latif
- Faculty of Medicine, Universiti Sultan Zainal Abidin, Kuala Nerus 21300, Terengganu, Malaysia.
| | - Haliza Katas
- Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Kuala Lumpur 50300, Malaysia.
| | - Wan Sani B Wan Nik
- School of Ocean Engineering, Universiti Malaysia Terengganu, 21300 Kuala Nerus, Terengganu, Malaysia.
| | - Mohamed B Awang
- Faculty of Pharmacy, Cyberjaya University College of Medical Sciences, Cyberjaya 63000, Malaysia.
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Azagury A, Amar-lewis E, Appel R, Hallak M, Kost J. Amplified CPEs enhancement of chorioamnion membrane mass transport by encapsulation in nano-sized PLGA particles. Eur J Pharm Biopharm 2017; 117:292-9. [DOI: 10.1016/j.ejpb.2017.04.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 04/26/2017] [Accepted: 04/28/2017] [Indexed: 01/20/2023]
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Affiliation(s)
- Wei-Cheng Yan
- Dept. of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4, Singapore 117585 Singapore
| | - Yen Wah Tong
- Dept. of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4, Singapore 117585 Singapore
| | - Chi-Hwa Wang
- Dept. of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4, Singapore 117585 Singapore
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12
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Dutta D, Fauer C, Hickey K, Salifu M, Stabenfeldt SE. Tunable delayed controlled release profile from layered polymeric microparticles. J Mater Chem B 2017; 5:4487-4498. [PMID: 28652916 DOI: 10.1039/c7tb00138j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Composite microparticles (MPs) with layered architecture, engineered from poly(L-lactic acid) (PLLA) and poly(D,L-lactic-co-glycolic acid) (PLGA), are promising devices for achieving the delayed release of proteins. Here, we build on a water-in-oil-in-oil-in-water emulsion method of fabricating layered MPs with an emphasis on modulating the delay period of the protein release profile. Particle hardening parameters (i.e. polymer precipitation rate and total hardening time) following water-in-oil-in-oil-in-water emulsions are known to affect MP structure such as the core/shell material and cargo localization. We demonstrate that layered MPs fabricated with two different solvent evaporation parameters not only alter polymer and protein distribution within the hardened MPs, but also affect their protein release profiles. Secondly, we hypothesize that ethanol (EtOH), a semi-polar solvent miscible in both the solvent (dichloromethane; DCM) and non-solvent aqueous phases, likely alters DCM and water flux from the dispersed oil phase. The results reveal that EtOH affects protein distribution within MPs, and may also influence MP structural properties such as porosity and polymer distribution. To our knowledge, we are the first to demonstrate EtOH as a means for modulating critical release parameters from protein-loaded, layered PLGA/PLLA MPs. Throughout all the groups in the study, we achieved differential delay periods (between 0 - 30 days after an initial burst release) and total protein release periods (~30 - >58 days) as a function of solvent evaporation parameters and EtOH content. The layered MPs proposed in the study potentially have wide-reaching applications in tissue engineering for delayed and sequential protein release.
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Affiliation(s)
- D Dutta
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, USA
| | - C Fauer
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, USA
| | - K Hickey
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, USA
| | - M Salifu
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, USA
| | - S E Stabenfeldt
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, USA
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Izadifar M, Kelly ME, Chen X. Regulation of sequential release of growth factors using bilayer polymeric nanoparticles for cardiac tissue engineering. Nanomedicine (Lond) 2016; 11:3237-3259. [DOI: 10.2217/nnm-2016-0220] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: Cardiac tissue engineering aims to develop engineered constructs for myocardial infarction repair, where a challenge is the control of growth factor (GF) sequential release. Herein, bilayer polymeric nanoparticles composed of a GF-encapsulating core surrounded by rate-regulating shell were developed for sequential GF release. Materials & methods: Single and bilayer polymeric nanoparticles were fabricated, characterized and biologically assessed. A novel ‘Geno-Neural model’ was developed and validated for rate-programming of the nanoparticles. Results: The bilayer nanoparticles featured low burst effect and time-delayed release, and allowed for sequential release of PDGF following co-release of VEGFand bFGF, which promoted angiogenesis. Conclusion: The nanoparticulate delivery system, along with the Geno-Neural model, offers great potential for spatiotemporal control of GF release for cardiovascular regenerative medicine.
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Affiliation(s)
- Mohammad Izadifar
- Division of Biomedical Engineering, College of Engineering, University of Saskatchewan, Saskatoon, SK, Canada
- Saskatchewan Cerebrovascular Centre, Royal University Hospital, Saskatoon, SK, Canada
| | - Michael E Kelly
- Division of Biomedical Engineering, College of Engineering, University of Saskatchewan, Saskatoon, SK, Canada
- Saskatchewan Cerebrovascular Centre, Royal University Hospital, Saskatoon, SK, Canada
- Department of Surgery, College of Medicine, University of Saskatchewan, Saskatoon, SK, Canada
| | - Xiongbiao Chen
- Division of Biomedical Engineering, College of Engineering, University of Saskatchewan, Saskatoon, SK, Canada
- Department of Mechanical Engineering, College of Engineering, University of Saskatchewan, Saskatoon, SK, Canada
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Bahari Javan N, Rezaie Shirmard L, Jafary Omid N, Akbari Javar H, Rafiee Tehrani M, Abedin Dorkoosh F. Preparation, statistical optimisation andin vitrocharacterisation of poly (3-hydroxybutyrate-co-3-hydroxyvalerate)/poly (lactic-co-glycolic acid) blend nanoparticles for prolonged delivery of teriparatide. J Microencapsul 2016; 33:460-474. [DOI: 10.1080/02652048.2016.1208296] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Ansary RH, Rahman MM, Awang MB, Katas H, Hadi H, Mohamed F, Doolaanea AA, Kamaruzzaman YB. Preparation, characterization and in vitro release study of BSA-loaded double-walled glucose-poly(lactide-co-glycolide) microspheres. Arch Pharm Res 2016; 39:1242-56. [PMID: 26818028 DOI: 10.1007/s12272-016-0710-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 01/18/2016] [Indexed: 11/24/2022]
Abstract
The aim of this study was to prepare a model protein, bovine serum albumin (BSA) loaded double-walled microspheres using a fast degrading glucose core, hydroxyl-terminated poly(lactide-co-glycolide) (Glu-PLGA) and a moderate-degrading carboxyl-terminated PLGA polymers to reduce the initial burst release and to eliminate the lag phase from the release profile of PLGA microspheres. The double-walled microspheres were prepared using a modified water-in-oil-in-oil-in-water (w/o/o/w) method and single-polymer microspheres were prepared using a conventional water-in-oil-in-water (w/o/w) emulsion solvent evaporation method. The particle size, morphology, encapsulation efficiency, thermal properties, in vitro drug release and structural integrity of BSA were evaluated in this study. Double-walled microspheres prepared with Glu-PLGA and PLGA polymers with a mass ratio of 1:1 were non-porous, smooth-surfaced, and spherical in shape. A significant reduction of initial burst release was achieved for the double-walled microspheres compared to single-polymer microspheres. In addition, microspheres prepared using Glu-PLGA and PLGA polymers in a mass ratio of 1:1 exhibited continuous BSA release after the small initial burst without any lag phase. It can be concluded that the double-walled microspheres made of Glu-PLGA and PLGA polymers in a mass ratio of 1:1 can be a potential delivery system for pharmaceutical proteins.
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Affiliation(s)
- Rezaul H Ansary
- Kulliyyah of Pharmacy, International Islamic University Malaysia (IIUM), 25200, Kuantan, Malaysia
| | - Mokhlesur M Rahman
- Kulliyyah of Pharmacy, International Islamic University Malaysia (IIUM), 25200, Kuantan, Malaysia.
| | - Mohamed B Awang
- Faculty of Pharmacy, Cyberjaya University College of Medical Sciences, 63000, Cyberjaya, Malaysia
| | - Haliza Katas
- Drug Delivery and Novel Targeting Research Group, Centre for Drug Delivery Research, Faculty of Pharmacy, Universiti Kebangsaan Malaysia, 50300, Kuala Lumpur, Malaysia
| | - Hazrina Hadi
- Kulliyyah of Pharmacy, International Islamic University Malaysia (IIUM), 25200, Kuantan, Malaysia
| | - Farahidah Mohamed
- Kulliyyah of Pharmacy, International Islamic University Malaysia (IIUM), 25200, Kuantan, Malaysia
| | - Abd Almonem Doolaanea
- Kulliyyah of Pharmacy, International Islamic University Malaysia (IIUM), 25200, Kuantan, Malaysia
| | - Yunus B Kamaruzzaman
- Kulliyyah of Science, International Islamic University Malaysia, 25200, Kuantan, Malaysia
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16
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Ansary RH, Rahman MM, Awang MB, Katas H, Hadi H, Doolaanea AA. Preparation, characterization, and in vitro release studies of insulin-loaded double-walled poly(lactide-co-glycolide) microspheres. Drug Deliv Transl Res 2016; 6:308-18. [DOI: 10.1007/s13346-016-0278-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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17
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Affiliation(s)
- Liqing Tan
- Department of Medicinal Chemistry; School of Pharmacy, Chongqing Medical University; Chongqing 400016 People's Republic of China
- Department of Pharmacy; The Third Affiliated Hospital of Third Military Medical University; Chongqing 400042 People's Republic of China
| | - Tao Jiang
- Department of Medicinal Chemistry; School of Pharmacy, Chongqing Medical University; Chongqing 400016 People's Republic of China
- Department of Pharmacy; Xinqiao Hospital of Third Military Medical University; Chongqing 400037 People's Republic of China
| | - Xiaolan Yang
- Key Laboratory of Clinical Laboratory Diagnostics of the Education Ministry; College of Laboratory Medicine; Chongqing Medical University; Chongqing 400016 People's Republic of China
| | - Wei Li
- Department of Medicinal Chemistry; School of Pharmacy, Chongqing Medical University; Chongqing 400016 People's Republic of China
| | - Lijun Pan
- Pharmaceutical Teaching Laboratory; Chongqing Medical University; Chongqing 400016 People's Republic of China
| | - Mingan Yu
- Department of Medicinal Chemistry; School of Pharmacy, Chongqing Medical University; Chongqing 400016 People's Republic of China
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Xia Y, Pack DW. Pulsatile protein release from monodisperse liquid-core microcapsules of controllable shell thickness. Pharm Res 2014; 31:3201-10. [PMID: 24831313 DOI: 10.1007/s11095-014-1412-5] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Accepted: 05/06/2014] [Indexed: 11/29/2022]
Abstract
PURPOSE Pulsatile delivery of proteins, in which release occurs over a short time after a period of little or no release, is desirable for many applications. This paper investigates the effect of biodegradable polymer shell thickness on pulsatile protein release from biodegradable polymer microcapsules. METHODS Using precision particle fabrication (PPF) technology, monodisperse microcapsules were fabricated encapsulating bovine serum albumin (BSA) in a liquid core surrounded by a drug-free poly(lactide-co-glycolide) (PLG) shell of uniform, controlled thickness from 14 to 19 μm. RESULTS When using high molecular weight PLG (Mw 88 kDa), microparticles exhibited the desired core-shell structure with high BSA loading and encapsulation efficiency (55-65%). These particles exhibited very slow release of BSA for several weeks followed by rapid release of 80-90% of the encapsulated BSA within 7 days. Importantly, with increasing shell thickness the starting time of the pulsatile release could be controlled from 25 to 35 days. CONCLUSIONS Biodegradable polymer microcapsules with precisely controlled shell thickness provide pulsatile release with enhanced control of release profiles.
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Affiliation(s)
- Yujie Xia
- Department of Chemical and Biomolecular Engineering, University of Illinois, 600 S. Mathews Avenue, Urbana, Illinois, 61801, USA
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Amini-Fazl MS, Mobedi H, Barzin J. Incorporation of HSA Microparticles Within the Taxol-Loaded In Situ Forming PLGA Microspheres: Synthesis, Characterization, and Drug Release. INT J POLYM MATER PO 2014. [DOI: 10.1080/00914037.2013.854237] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Abstract
Core–shell PLGA/PLLA polymer microspheres sustained 2 weeks in vivo bupivacaine release, providing extended postoperative analgesia without infection or joint damage.
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Affiliation(s)
- Y. Shona Pek
- Institute of Bioengineering and Nanotechnology
- , Singapore 138669
| | | | - Jackie Y. Ying
- Institute of Bioengineering and Nanotechnology
- , Singapore 138669
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Korehei R, Kadla JF. Encapsulation of T4 bacteriophage in electrospun poly(ethylene oxide)/cellulose diacetate fibers. Carbohydr Polym 2014; 100:150-7. [DOI: 10.1016/j.carbpol.2013.03.079] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2012] [Revised: 03/16/2013] [Accepted: 03/25/2013] [Indexed: 11/25/2022]
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Xia Y, Ribeiro PF, Pack DW. Controlled protein release from monodisperse biodegradable double-wall microspheres of controllable shell thickness. J Control Release 2013; 172:707-14. [PMID: 23954731 DOI: 10.1016/j.jconrel.2013.08.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Accepted: 08/08/2013] [Indexed: 01/13/2023]
Abstract
Biodegradable polymer microparticles are promising delivery depots for protein therapeutics due to their relatively simple fabrication and facile administration. Double-wall microspheres (DWMS) comprising a core and shell made of two distinct polymers may provide enhanced control of the drug release profiles. Using precision particle fabrication (PPF) technology, monodisperse DWMS were fabricated with model protein bovine serum albumin (BSA)-loaded poly(lactide-co-glycolide) (PLG) core and drug-free poly(d,l-lactic acid) (PDLL) shell of uniform thickness. Monolithic single-wall microspheres were also fabricated to mimic the BSA-loaded PLG core. Using ethyl acetate and dichloromethane as shell- and core-phase solvents, respectively, BSA was encapsulated selectively in the core region within DWMS with higher loading and encapsulation efficiency compared to using dichloromethane as core and shell solvents. BSA in vitro release rates were retarded by the presence of the drug-free PDLL shell. Moreover, increasing PDLL shell thickness resulted in decreasing BSA release rate. With a 14-μm thick PDLL shell, an extended period of constant-rate release was achieved.
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Affiliation(s)
- Yujie Xia
- Department of Chemical and Biomolecular Engineering, University of Illinois, 600 S. Mathews Avenue, Urbana, IL 61801, USA
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Devrim B, Bozkır A. Preparation and evaluation of double-walled microparticles prepared with a modified water-in-oil-in-oil-in-water (w1/o/o/w3) method. J Microencapsul 2013; 30:741-54. [DOI: 10.3109/02652048.2013.788082] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Navaei A, Rasoolian M, Momeni A, Emami S, Rafienia M. Double-walled microspheres loaded with meglumine antimoniate: preparation, characterization andin vitrorelease study. Drug Dev Ind Pharm 2013; 40:701-10. [DOI: 10.3109/03639045.2013.777734] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Xu Q, Chin SE, Wang CH, Pack DW. Mechanism of drug release from double-walled PDLLA(PLGA) microspheres. Biomaterials 2013; 34:3902-11. [PMID: 23453059 DOI: 10.1016/j.biomaterials.2013.02.015] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Accepted: 02/06/2013] [Indexed: 11/22/2022]
Abstract
The drug release and degradation behavior of two double-walled microsphere formulations consisting of a doxorubicin-loaded poly(d,l-lactic-co-glycolic acid) (PLGA) core (∼46 kDa) surrounded by a poly(d,l-lactic acid) (PDLLA) shell layer (∼55 and 116 kDa) were examined. It was postulated that different molecular weights of the shell layer could modulate the erosion of the outer coating and limit the occurrence of water penetration into the inner drug-loaded core on various time scales, and therefore control the drug release from the microspheres. For both microsphere formulations, the drug release profiles were observed to be similar. The degradation of the microspheres was monitored for a period of about nine weeks and analyzed using scanning electron microscopy, laser scanning confocal microscopy, and gel permeation chromatography. Interestingly, both microsphere formulations exhibited occurrence of bulk erosion of PDLLA on a similar time scale despite different PDLLA molecular weights forming the shell layer. The shell layer of the double-walled microspheres served as an effective diffusion barrier during the initial lag phase period and controlled the release rate of the hydrophilic drug independent of the molecular weight of the shell layer.
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Li X, Li L, Wang X, Ren Y, Zhou T, Lu W. Application of Model‐based Methods to Characterize Exenatide‐loaded Double‐walled Microspheres: In vivo Release, Pharmacokinetic/Pharmacodynamic Model, and In Vitro and In Vivo Correlation. J Pharm Sci 2012; 101:3946-61. [DOI: 10.1002/jps.23236] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 05/03/2012] [Accepted: 05/30/2012] [Indexed: 12/12/2022]
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Xu Q, Xia Y, Wang CH, Pack DW. Monodisperse double-walled microspheres loaded with chitosan-p53 nanoparticles and doxorubicin for combined gene therapy and chemotherapy. J Control Release 2012; 163:130-5. [PMID: 22981564 DOI: 10.1016/j.jconrel.2012.08.032] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Revised: 08/14/2012] [Accepted: 08/31/2012] [Indexed: 12/19/2022]
Abstract
We have designed and evaluated a dual anticancer delivery system to provide combined gene therapy and chemotherapy. Double-walled microspheres consisting of a poly(d,l-lactic-co-glycolic acid) (PLGA) core surrounded by a poly(lactic acid) (PLA) shell were fabricated via the precision particle fabrication (PPF) technique. We make use of the advantages of double-walled microspheres to deliver chitosan-DNA nanoparticles containing the gene encoding the p53 tumor suppressor protein (chi-p53) and/or doxorubicin (Dox), loaded in the shell and core phases, respectively. Different molecular weights of PLA were used to form the shell layer for each formulation. The microspheres were monodisperse with a mean diameter of 65 to 75 μm and uniform shell thickness of 8 to 17 μm. Blank and Dox-loaded microspheres typically exhibited a smooth surface with relatively few small pores, while chi-microspheres containing p53 nanoparticles, with and without Dox, presented rough and porous surfaces. The encapsulation efficiency of Dox was significantly higher when it was encapsulated alone compared to co-encapsulation with chi-p53 nanoparticles. The encapsulation efficiency of chi-p53 nanoparticles, on the other hand, was not affected by the presence of Dox. As desired, chi-p53 nanoparticles were released first, followed by simultaneous release of chi-p53 nanoparticles and Dox at a near zero-order rate. Thus, we have demonstrated that the PPF method is capable of producing double-walled microspheres and encapsulating dual agents for combined modality treatment, such as gene therapy and chemotherapy.
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Lee WL, Seh YC, Widjaja E, Chong HC, Tan NS, Joachim Loo SC. Fabrication and Drug Release Study of Double-Layered Microparticles of Various Sizes. J Pharm Sci 2012; 101:2787-97. [DOI: 10.1002/jps.23191] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Revised: 03/27/2012] [Accepted: 04/24/2012] [Indexed: 12/21/2022]
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Abstract
Modern drug discovery technologies are discovering more and more potent therapeutic agents with narrow therapeutic windows, thus necessitating the improvement of current particulate drug delivery systems. Conventional single-layered polymeric particles have limited control over drug release profiles, including burst release, the inability to provide zero-order, pulsatile, time-delayed release and controlled release of multiple drugs. In an attempt to better control drug release kinetics, the development of multilayered microparticles has been introduced. In this review, we give an overview of the fabrication and characterization techniques of multilayered polymeric microparticles. We also focus on the one-step solvent evaporation technique, and the key process parameters in this technique that affect the formation of microparticle configurations. In addition, the benefits and challenges of multilayered microparticulate system for drug delivery were discussed. This review intends to portray how distinctive structural attributes and degradation behaviors of multilayered microparticles can be exploited to fine-tune drug release profiles and kinetics.
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Affiliation(s)
- Wei Li Lee
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Ave., Singapore, Singapore
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31
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Lee WL, Widjaja E, Loo SCJ. Designing drug-loaded multi-layered polymeric microparticles. J Mater Sci Mater Med 2012; 23:81-88. [PMID: 22127404 DOI: 10.1007/s10856-011-4508-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2011] [Accepted: 11/18/2011] [Indexed: 05/31/2023]
Abstract
This work reports how novel multi-layered (from double-layered to quadruple-layered) microparticles comprising immiscible polymers can be fabricated through a simple, economical, reliable and versatile one-step solvent evaporation method. These multi-layered microparticles would be excellent candidates to overcome problems inherent in single-layered microparticles for drug delivery. Particle morphologies, layer configurations, and drug distribution were determined by scanning electron microscopy and Raman mapping. Key process parameters achieving the formation of the multi-layered structure were identified. Encapsulation of multiple drugs and layer localization of these drugs within these multi-layered microparticles have also shown to be possible, which were driven by drug-polymer affinity. This one-step fabrication technique can therefore be used for tailoring particle designs, thus facilitating the development of multiparticulate drug delivery devices.
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Affiliation(s)
- Wei Li Lee
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore
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Abstract
In spite of the numerous barriers inherent in the oral delivery of therapeutically active proteins, research into the development of functional protein-delivery systems is still intense. The effectiveness of such oral protein-delivery systems depend on their ability to protect the incorporated protein from proteolytic degradation in the GI tract and enhance its intestinal absorption without significantly compromising the bioactivity of the protein. Among these delivery systems are polyelectrolyte complexes (PECs) which are composed of polyelectrolyte polymers complexed with a protein via coulombic and other interactions. This review will focus on the current status of PECs with a particular emphasis on the potential and limitations of multi- or inter-polymer PECs used to facilitate oral protein delivery.
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Lee WL, Loei C, Widjaja E, Loo SCJ. Altering the drug release profiles of double-layered ternary-phase microparticles. J Control Release 2011; 151:229-38. [DOI: 10.1016/j.jconrel.2011.02.012] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2010] [Revised: 02/09/2011] [Accepted: 02/11/2011] [Indexed: 10/18/2022]
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Ahmed AR, Elkharraz K, Irfan M, Bodmeier R. Reduction in burst release after coating poly(D,L-lactide-co-glycolide) (PLGA) microparticles with a drug-free PLGA layer. Pharm Dev Technol 2010; 17:66-72. [PMID: 20854130 DOI: 10.3109/10837450.2010.513989] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The high initial burst release of a highly water-soluble drug from poly (D,L-lactide-co-glycolide) (PLGA) microparticles prepared by the multiple emulsion (w/o/w) solvent extraction/evaporation method was reduced by coating with an additional polymeric PLGA layer. Coating with high encapsulation efficiency was performed by dispersing the core microparticles in peanut oil and subsequently in an organic polymer solution, followed by emulsification in the aqueous solution. Hardening of an additional polymeric layer occurred by oil/solvent extraction. Peanut oil was used to cover the surface of core microparticles and, therefore, reduced or prevented the rapid erosion of core microparticles surface. A low initial burst was obtained, accompanied by high encapsulation efficiency and continuous sustained release over several weeks. Reduction in burst release after coating was independent of the amount of oil. Either freshly prepared (wet) or dried (dry) core microparticles were used. A significant initial burst was reduced when ethyl acetate was used as a solvent instead of methylene chloride for polymer coating. Multiparticle encapsulation within the polymeric layer increased as the size of the core microparticles decreased (< 50 µm), resulting in lowest the initial burst. The initial burst could be controlled well by the coating level, which could be varied by varying the amount of polymer solution, used for coating.
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Affiliation(s)
- Abid Riaz Ahmed
- College of Pharmacy, Freie Universität Berlin, Kelchstr. 31, 12169 Berlin, Germany.
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36
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Lee WL, Widjaja E, Loo SCJ. One-step fabrication of triple-layered polymeric microparticles with layer localization of drugs as a novel drug-delivery system. Small 2010; 6:1003-1011. [PMID: 20358528 DOI: 10.1002/smll.200901985] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Particulate systems have tremendous potential to achieve controlled release and targeted delivery of drugs. However, conventional single-layered particles have several inherent limitations, including initial burst release, the inability to provide zero-order release, and a lack of time-delayed or pulsatile release of therapeutic agents. Multilayered particles have the potential to overcome these disadvantages. Herein, it is shown how triple-layered polymeric microparticles can be fabricated through a simple, economical, reliable, and versatile one-step solvent evaporation technique. Particle morphologies and layer configurations are determined by scanning electron microscopy, polymer dissolution tests, and Raman mapping. Key fabrication parameters that affect the formation of triple-layered polymeric microparticles comprising poly(DL-lactide-co-glycolide) (50:50), poly(L-lactide), and poly(ethylene-co-vinyl acetate) (40 wt% vinyl acetate) are discussed, along with their formation mechanisms. Layer thickness and the configurations of these microparticles are altered by changing the polymer mass ratios. Finally, it is shown that drugs can be localized in specific layers of the microparticles. This fabrication process can therefore be used to tailor microparticle designs, thus allowing such "designer" particulate drug-delivery systems to function across a wide range of applications.
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Affiliation(s)
- Wei Li Lee
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
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Lee WL, Hong M, Widjaja E, Loo SCJ. Formation and Degradation of Biodegradable Triple-Layered Microparticles. Macromol Rapid Commun 2010; 31:1193-200. [DOI: 10.1002/marc.200900811] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2009] [Revised: 12/30/2009] [Indexed: 11/08/2022]
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38
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Kokai LE, Tan H, Jhunjhunwala S, Little SR, Frank JW, Marra KG. Protein bioactivity and polymer orientation is affected by stabilizer incorporation for double-walled microspheres. J Control Release 2010; 141:168-76. [DOI: 10.1016/j.jconrel.2009.09.003] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2009] [Accepted: 09/04/2009] [Indexed: 11/18/2022]
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40
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Xiang Z, Sarazin P, Favis BD. Controlling Burst and Final Drug Release Times from Porous Polylactide Devices Derived from Co-continuous Polymer Blends. Biomacromolecules 2009; 10:2053-66. [DOI: 10.1021/bm8013632] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhenyu Xiang
- CREPEC, Department of Chemical Engineering, École Polytechnique de Montréal, P.O. Box 6079, Station Centre-ville, Montréal, (QC) Canada H3C 3A7
| | - Pierre Sarazin
- CREPEC, Department of Chemical Engineering, École Polytechnique de Montréal, P.O. Box 6079, Station Centre-ville, Montréal, (QC) Canada H3C 3A7
| | - Basil D. Favis
- CREPEC, Department of Chemical Engineering, École Polytechnique de Montréal, P.O. Box 6079, Station Centre-ville, Montréal, (QC) Canada H3C 3A7
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41
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Salaün F, Vroman I, Aubry C. Preparation of double layered shell microparticles containing an acid dye by a melt dispersion–coacervation technique. POWDER TECHNOL 2009; 192:375-83. [DOI: 10.1016/j.powtec.2009.01.018] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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42
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Park W, Na K. Polyelectrolyte complex of chondroitin sulfate and peptide with lower pI value in poly(lactide-co-glycolide) microsphere for stability and controlled release. Colloids Surf B Biointerfaces 2009; 72:193-200. [PMID: 19414243 DOI: 10.1016/j.colsurfb.2009.04.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2009] [Revised: 04/01/2009] [Accepted: 04/01/2009] [Indexed: 10/20/2022]
Abstract
A polyelectrolyte complex between a therapeutic peptide and chargeable polymer was applied to prevent peptide denaturation in poly(lactide-co-glycolide) (PLGA) microspheres. Chondroitin sulfate A (CsA) was employed as a polymeric additive for the formation of an ionic complex with insulin (InS). The complex prepared at pH 3.0 evidenced a nano-size in the range of 100-400 nm with a mono distribution. The stability of InS in the complex in an organic/water (O/W) interface was verified via RP-HPLC. The insulin in the complex evidenced a retention time almost identical to native InS, whereas free insulin did not evidence such a retention time. On the basis of these studies, PLGA microspheres including a complex with various CsA/InS ratios were prepared via a double-emulsion method (PLGA/CsA MS). InS loading efficiency in the system is higher than that of the microspheres without CsA. The system evidenced a lower initial burst and, following the initial burst, continuous release kinetics for 30 days. Circular dichroism (CD) spectra demonstrated that the insulin in PLGA/CsA MS is more stable than the PLGA-only microspheres (PLGA/only MS) for 20 days. These results indicate that the complex system with CsA is useful for the long-term delivery of peptides with lower pI values.
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Affiliation(s)
- Wooram Park
- Department of Biotechnology, The Catholic University of Korea, 43-1 Yeokkok2-dong, Wonmi-gu, Bucheon-si, Gyeonggi-do, 420-743, Republic of Korea
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Zheng W. A water-in-oil-in-oil-in-water (W/O/O/W) method for producing drug-releasing, double-walled microspheres. Int J Pharm 2009; 374:90-5. [PMID: 19446764 DOI: 10.1016/j.ijpharm.2009.03.015] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2008] [Revised: 03/09/2009] [Accepted: 03/11/2009] [Indexed: 10/21/2022]
Abstract
A water-in-oil-in-oil-in-water (W/O/O/W) method was developed to fabricate double-walled microspheres for controlled delivery of drugs and therapeutic proteins with reduced initial burst and prolonged release. By using this method, drugs and therapeutic proteins can be loaded into microspheres in solution form as those used in medical treatments. Proteins can be loaded in solutions together with excipients, thereby reducing the risk of losing stability in the process of protein drying and dispersing. This also benefits uniform distribution of drugs inside polymer matrix in comparison to the case with solid drug particles. These microspheres were characterized to have double-walled structure, with a cavity in the centre. The hydrophilic drugs were encapsulated in the inner polymer layer, while the non-drug-loaded outer layer served as a rate-limiting barrier. Drug release profiles for 5-fluorouracil showed low initial burst and prolonged release, which is substantiated by degradation studies.
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Affiliation(s)
- Wang Zheng
- Department of Chemical & Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore.
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Raffin RP, Colomé LM, Guterres SS, Pohlmann AR. Enteric Controlled-Release Pantoprazole-Loaded Microparticles Prepared by Using Eudragit S100 and Poly(ε-caprolactone) Blend. Pharm Dev Technol 2008; 12:463-71. [DOI: 10.1080/10837450701556933] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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45
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Feczkó T, Tóth J, Gyenis J. Comparison of the preparation of PLGA–BSA nano- and microparticles by PVA, poloxamer and PVP. Colloids Surf A Physicochem Eng Asp 2008. [DOI: 10.1016/j.colsurfa.2007.07.011] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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46
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Salehi P, Sarazin P, Favis BD. Porous Devices Derived from Co-Continuous Polymer Blends as a Route for Controlled Drug Release. Biomacromolecules 2008; 9:1131-8. [DOI: 10.1021/bm7010467] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pouneh Salehi
- CREPEC, Department of Chemical Engineering, École Polytechnique de Montréal, P.O. Box 6079 Station Centre-ville, Montréal, (QC) Canada H3C 3A7
| | - Pierre Sarazin
- CREPEC, Department of Chemical Engineering, École Polytechnique de Montréal, P.O. Box 6079 Station Centre-ville, Montréal, (QC) Canada H3C 3A7
| | - Basil D. Favis
- CREPEC, Department of Chemical Engineering, École Polytechnique de Montréal, P.O. Box 6079 Station Centre-ville, Montréal, (QC) Canada H3C 3A7
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Abstract
Poly(lactic acid) (PLA) and poly(lactic-co-glycolic acid) (PLGA) microspheres and nanoparticles remain the focus of intensive research effort directed to the controlled release and in vivo localization of drugs. In recent years engineering approaches have been devised to create novel micro- and nano-particles which provide greater control over the drug release profile and present opportunities for drug targeting at the tissue and cellular levels. This has been possible with better understanding and manipulation of the fabrication and degradation processes, particularly emulsion-solvent extraction, and conjugation of polyesters with ligands or other polymers before or after particle formation. As a result, particle surface and internal porosity have been designed to meet criteria-facilitating passive targeting (e.g., for pulmonary delivery), modification of the drug release profile (e.g., attenuation of the burst release) and active targeting via ligand binding to specific cell receptors. It is now possible to envisage adventurous applications for polyester microparticles beyond their inherent role as biodegradable, controlled drug delivery vehicles. These may include drug delivery vehicles for the treatment of cerebral disease and tumor targeting, and co-delivery of drugs in a pulsatile and/or time-delayed fashion.
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Affiliation(s)
- Farahidah Mohamed
- Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 27 Taylor Street, Glasgow, UK
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Liu F, Liu L, Li X, Zhang Q. Preparation of chitosan-hyaluronate double-walled microspheres by emulsification-coacervation method. J Mater Sci Mater Med 2007; 18:2215-24. [PMID: 17701294 DOI: 10.1007/s10856-007-3228-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2006] [Accepted: 06/19/2007] [Indexed: 05/16/2023]
Abstract
Chitosan (CHS)-hyaluronate (HA) double-walled microspheres were prepared by emulsification-coacervation method. Tripolyphosphate (TPP) acted as ion crosslinker. The effects of oil/water volume ratio, surfactant, solution pH, TPP concentration, HA concentration, and emulsification time on microspheres fabrication and morphology were examined by Zeta (zeta) potential, Scanning electron microscopy (SEM) and Fourier-transform infrared spectrometry (FT-IR). It was found that TPP concentration, solution pH, surfactant and emulsification time were crucial factors for microspheres fabrication. Spherical microspheres with smooth surface were formed when TPP concentration was 8% or higher. The optimal pH for microspheres formation ranged from 6.0 to 7.0. As for surfactant, the microspheres obtained when span80 was applied alone were shapelier compared with those obtained when both span80 and tween80 were applied. With insufficient emulsification time, vacuous microcapsules, but not compact microspheres were formed. In addition, oil/water volume ratio and HA concentration also affected the microspheres morphology, but less importantly.
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Affiliation(s)
- Fengxia Liu
- Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, PR China
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Lee ES, Park KH, Kang D, Park IS, Min HY, Lee DH, Kim S, Kim JH, Na K. Protein complexed with chondroitin sulfate in poly(lactide-co-glycolide) microspheres. Biomaterials 2007; 28:2754-62. [PMID: 17337049 DOI: 10.1016/j.biomaterials.2007.01.049] [Citation(s) in RCA: 59] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2006] [Accepted: 01/23/2007] [Indexed: 12/15/2022]
Abstract
Chondroitin sulfate (CsA) is an acidic mucopolysaccharide, which is able to form ionic complexes with positively charged proteins. In this study, a protein-CsA complex was constructed to nano-sized particles. Zeta potential measurements revealed that a CsA-to-protein fraction of greater than 0.1 results in a neutralization of the positive charge on lysozyme (Lys). Based on this preliminary study, we have prepared poly(lactide-co-glycolide) (PLGA) microspheres harboring Lys/CsA complexes via the multi-emulsion method. Protein stability in the PLGA microspheres was preserved during both microsphere preparation and protein release. The profiles of Lys release from the PLGA microspheres evidenced nearly zero-order kinetics, depending on the quantity of CsA. An in vivo fluorescent image of experimental mouse tissue showed that the PLGA microspheres with the Lys/CsA complex had released the entirety of their Lys without no residual amount after 23 days, but microspheres without the complex harbored a great deal of residual Lys, which is attributable to its degradation by acidic PLGA degradates. The tissue reaction evidenced by the PLGA microspheres stabilized with CsA showed minimal foreign body reaction and little configuration of immune cells including neutrophils and macrophages, but the reactions of the PLGA microspheres without CsA were characterized by a relatively elevated inflammation. These results show that CsA is a viable candidate for long-acting micro-particular protein delivery.
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Affiliation(s)
- Eun Seong Lee
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, UT 84108, USA
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Abstract
PURPOSE Encapsulation of liquids into biodegradable polymer microcapsules has been a challenging task due to production limitations stemming from solution viscosity, phase stabilization, molecular localization, and scalable production. We report an extension of Precision Particle Fabrication (PPF) technology for the production of monodisperse liquid-filled microcapsules containing an oil or aqueous core and contrast these results to double-walled microspheres. MATERIALS AND METHODS PPF technology utilizes a coaxial nozzle to produce a liquid core jet surrounded by a polymer annular jet, which is further encompassed by a non-solvent carrier stream, typically 0.5% wt/vol polyvinyl alcohol in water. Jet diameters are controlled by the volumetric flow rate of each phase. The compound jet is then disrupted into uniform core/shell droplets via a controllable acoustic wave and shell material is hardened by solvent extraction. RESULTS Monodisperse polymeric microcapsules demonstrated a narrow size distribution and the formation of a continuous shell leading to efficient encapsulation of various liquid cores. The intermingling of core and shell phases and the localization of different molecular probes (fluorescent dyes and fluorescently labeled proteins) to the core or shell phase provided additional evidence of phase separation and molecular partitioning, respectively. We also demonstrate the pulsatile release of bovine serum albumin encapsulated in an aqueous core. CONCLUSIONS PPF technology provided exceptional control of the overall size and shell thickness of microcapsules filled with various types of oil or water. This technique may enable advanced delivery profiles of pharmaceuticals or nutraceuticals.
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Affiliation(s)
- Cory Berkland
- Department of Chemical and Petroleum Engineering, 2030 Becker Dr., Lawrence, Kansas 66047, USA.
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