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Panigrahi SK, Das S, Majumdar S. Unveiling the potentials of hydrophilic and hydrophobic polymers in microparticle systems: Opportunities and challenges in processing techniques. Adv Colloid Interface Sci 2024; 326:103121. [PMID: 38457900 DOI: 10.1016/j.cis.2024.103121] [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: 12/18/2023] [Revised: 02/24/2024] [Accepted: 02/28/2024] [Indexed: 03/10/2024]
Abstract
Conventional drug delivery systems are associated with various shortcomings, including low bioavailability and limited control over release. Biodegradable polymeric microparticles have emerged as versatile carriers in drug delivery systems addressing all these challenges. This comprehensive review explores the dynamic landscape of microparticles, considering the role of hydrophilic and hydrophobic materials. Within the continuously evolving domain of microparticle preparation methods, this review offers valuable insights into the latest advancements and addresses the factors influencing microencapsulation, which is pivotal for harnessing the full potential of microparticles. Exploration of the latest research in this dynamic field unlocks the possibilities of optimizing microencapsulation techniques to produce microparticles of desired characteristics and properties for different applications, which can help contribute to the ongoing evolution in the field of pharmaceutical science.
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Affiliation(s)
- Subrat Kumar Panigrahi
- Department of Chemical Engineering, Indian Institute of Technology, Hyderabad, Telangana 502285, India
| | - Sougat Das
- Department of Chemical Engineering, Indian Institute of Technology, Hyderabad, Telangana 502285, India
| | - Saptarshi Majumdar
- Department of Chemical Engineering, Indian Institute of Technology, Hyderabad, Telangana 502285, India.
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Pilatti F, Isolani R, Valone L, de Paula MN, Caleare ADO, Ferreira SBDS, Bruschi ML, de Medeiros Araújo DC, Guedes TA, Hensel A, de Mello JCP. Microstructured Polymer System Containing Proanthocyanidin-Enriched Extract from Limonium brasiliense as a Prophylaxis Strategy to Prevent Recurrence of Porphyromonas gingivalis. PLANTA MEDICA 2023; 89:1074-1086. [PMID: 35598603 DOI: 10.1055/a-1858-6898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Periodontal diseases are a global oral health problem affecting almost 10% of the global population. Porphyromonas gingivalis is one of the main bacteria involved in the initiation and progression of inflammatory processes as a result of the action of the cysteine proteases lysin- and arginine-gingipain. Surelease/polycarbophil microparticles containing a lyophilized proanthocyanidin-enriched fraction from the rhizomes of Limonium brasiliense, traditionally named "baicuru" (ethyl acetate fraction), were manufactured. The ethyl acetate fraction was characterized by UHPLC by the presence of samarangenins A and B (12.10 ± 0.07 and 21.05 ± 0.44%, respectively) and epigallocatechin-3-O-gallate (13.44 ± 0.27%). Physiochemical aspects of Surelease/polycarbophil microparticles were characterized concerning particle size, zeta potential, entrapment efficiency, ethyl acetate fraction release, and mucoadhesion. Additionally, the presence of the ethyl acetate fraction-loaded microparticles was performed concerning potential influence on viability of human buccal KB cells, P. gingivalis adhesion to KB cells, gingipain activity, and P. gingivalis biofilm formation. In general, all Surelease/polycarbophil microparticles tested showed strong adhesion to porcine cheek mucosa (93.1 ± 4.2% in a 30-min test), associated with a prolonged release of the ethyl acetate fraction (up to 16.5 ± 0.8% in 24 h). Preincubation of KB cells with Surelease/polycarbophil microparticles (25 µg/mL) resulted in an up to 93 ± 2% reduced infection rate by P. gingivalis. Decreased activity of the P. gingivalis-specific virulence factors lysin- and arginine-gingipain proteases by Surelease/polycarbophil microparticles was confirmed. Surelease/polycarbophil microparticles decreased biofilm formation of P. gingivalis (97 ± 2% at 60 µg/mL). Results from this study prove the promising activity of Surelease/polycarbophil microparticles containing ethyl acetate fraction microparticles as a prophylaxis strategy to prevent the recurrence of P. gingivalis.
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Affiliation(s)
- Fernanda Pilatti
- Postgraduate Program in Pharmaceutical Sciences, Palafito, Universidade Estadual de Maringá, Maringá, Brazil
- Institute of Pharmaceutical Biology and Phytochemistry, University of Münster, Münster, Germany
| | - Raquel Isolani
- Postgraduate Program in Pharmaceutical Sciences, Palafito, Universidade Estadual de Maringá, Maringá, Brazil
| | - Larissa Valone
- Postgraduate Program in Pharmaceutical Sciences, Palafito, Universidade Estadual de Maringá, Maringá, Brazil
| | - Mariana Nascimento de Paula
- Postgraduate Program in Pharmaceutical Sciences, Palafito, Universidade Estadual de Maringá, Maringá, Brazil
| | - Angelo de Oliveira Caleare
- Postgraduate Program in Pharmaceutical Sciences, Palafito, Universidade Estadual de Maringá, Maringá, Brazil
| | | | - Marcos Luciano Bruschi
- Postgraduate Program in Pharmaceutical Sciences, Palafito, Universidade Estadual de Maringá, Maringá, Brazil
| | | | | | - Andreas Hensel
- Institute of Pharmaceutical Biology and Phytochemistry, University of Münster, Münster, Germany
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Matsumoto A, Murakami M. Harmless and ecologically acceptable fabrication of long-acting injectable microspheres. Drug Discov Ther 2023:2023.01008. [PMID: 37245983 DOI: 10.5582/ddt.2023.01008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The use of harmful solvents during the preparation of pharmaceutical formulations is restricted to preserve environment and ensure safety of industrial operations. However, harmful solvents must be used to produce certain formulations. For instance, methylene chloride has been used in the fabrication of polylactic acid (PLA) and poly(lactic-co-glycolic) acid (PLGA) microspheres. This review highlights the latest advances in the strategy of PLA or PLGA microsphere production from non-halogenated solvents and describes advantages and limitations of these methods. The study also discusses the development of dry fabrication techniques for microsphere fabrication and the positioning of conventional and dry fabrication in the containment concept for workers' safety.
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Affiliation(s)
- Akihiro Matsumoto
- Laboratory of Pharmaceutics, Faculty of Pharmacy, Osaka Ohtani University, Osaka, Japan
| | - Masahiro Murakami
- Laboratory of Pharmaceutics, Faculty of Pharmacy, Osaka Ohtani University, Osaka, Japan
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Nicoletti F, Hammer L, Furtado S, Mangano K, Mathiowitz E, Green B, Auci DL. Oral Delivery of Encapsulated All-Trans Retinoic Acid Ameliorates Disease in Rodent Models of Colitis. Inflamm Bowel Dis 2021; 28:455-465. [PMID: 34417826 PMCID: PMC8889276 DOI: 10.1093/ibd/izab204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Indexed: 12/09/2022]
Abstract
BACKGROUND All-trans retinoic acid (ATRA) is a biologically active isomer of retinoic acid (RA). Topical ATRA (retin-a, retin-a micro, atralin, renova, and avita) is the active pharmaceutical ingredient for FDA-approved treatments for acne and skin wrinkles. Oral formulations (Vesanoid) treat acute promyelocytic leukemia, but oral dosing can induce severe side effects. Despite benefits in various rodent models of inflammatory bowel disease (IBD), toxicity and controversial clinical observations have diminished enthusiasm for ATRA IBD clinical trials. To circumvent these issues and to use ATRA's key role in maintaining gut tolerance, we developed a poly(lactic-co-glycolic acid) (PLGA) microsphere (MS) encapsulated ATRA formulation aimed at directing ATRA delivery to immune structures of the gut, limiting systemic exposure. Initially, ATRA MS was developed as a component of a combinatorial product (TreXTAM) that also contained encapsulated transforming growth factor (TGF)-β and ATRA in a 1:2 w/w ratio. Although the combination was optimal, benefit was also observed when ATRA MS was given alone in the CD4+ CD25-T-cell adoptive transfer (ACT) colitis model. METHODS We used the ACT and DSS-induced murine models of colitis to expand on the dose-dependent effects of oral ATRA MS when given alone. The DSS model was also used to compare the efficacy of ATRA MS and soluble ATRA, while healthy animals were used to compare the pharmacokinetics of the two drugs. RESULTS In both the ACT and DSS-induced murine models of colitis, ATRA MS was observed to be effective in ameliorating disease. ATRA MS was also observed to be more effective than soluble ATRA in these models and displayed more favorable pharmacokinetics. CONCLUSIONS We suggest ATRA MS, as a standalone product, may attenuate IBD and perhaps limit fibrosis, while limiting systemic side effects.
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Affiliation(s)
| | | | | | | | | | | | - Dominick L Auci
- Therapyx, Inc., Louisville, Kentucky, USA,Address correspondence to: Dominick L. Auci, PhD, Vice President, Research and Development, Therapyx, Inc., 2010 Cherokee Pkwy, Suite 2, Louisville, KY 40204, USA ()
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PLGA/PLA-Based Long-Acting Injectable Depot Microspheres in Clinical Use: Production and Characterization Overview for Protein/Peptide Delivery. Int J Mol Sci 2021; 22:ijms22168884. [PMID: 34445587 PMCID: PMC8396256 DOI: 10.3390/ijms22168884] [Citation(s) in RCA: 61] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 08/14/2021] [Accepted: 08/16/2021] [Indexed: 12/20/2022] Open
Abstract
Over the past few decades, long acting injectable (LAI) depots of polylactide-co-glycolide (PLGA) or polylactic acid (PLA) based microspheres have been developed for controlled drug delivery to reduce dosing frequency and to improve the therapeutic effects. Biopharmaceuticals such as proteins and peptides are encapsulated in the microspheres to increase their bioavailability and provide a long release period (days or months) with constant drug plasma concentration. The biodegradable and biocompatible properties of PLGA/PLA polymers, including but not limited to molecular weight, end group, lactide to glycolide ratio, and minor manufacturing changes, could greatly affect the quality attributes of microsphere formulations such as release profile, size, encapsulation efficiency, and bioactivity of biopharmaceuticals. Besides, the encapsulated proteins/peptides are susceptible to harsh processing conditions associated with microsphere fabrication methods, including exposure to organic solvent, shear stress, and temperature fluctuations. The protein/peptide containing LAI microspheres in clinical use is typically prepared by double emulsion, coacervation, and spray drying techniques. The purpose of this review is to provide an overview of the formulation attributes and conventional manufacturing techniques of LAI microspheres that are currently in clinical use for protein/peptides. Furthermore, the physicochemical characteristics of the microsphere formulations are deliberated.
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Grizić D, Lamprecht A. Process parameters of microsphere preparation based on propylene carbonate emulsion-precursors. J Microencapsul 2020; 38:1-10. [PMID: 32930025 DOI: 10.1080/02652048.2020.1823501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
AIM This study aimed for a detailed understanding of the impact of different process parameters involved during celecoxib-loaded microsphere preparation based on propylene carbonate emulsion-precursors. METHODS Microspheres were prepared by a modified emulsification-solvent extraction method. Performed investigations included polymer solubility and viscosity, microsphere size, morphology and stability, propylene carbonate content as well as celecoxib solid state, content and release. RESULTS Rough-walled round microspheres with sizes between 21 µm and 122 µm and an internal sponge-like structure filled with residual propylene carbonate (content between 1.9 ± 0.1% and 6.7 ± 0.5% w/w) were obtained. Encapsulation efficiencies varied between 28.3 ± 0.1% and 66.8 ± 1.0%. The release rates were affected by the polymer concentration, the emulsion phase ratio and the residual propylene carbonate content (t50% varied between 2.2 hours and 23.4 hours). CONCLUSIONS This study identified the most relevant process parameters for this new preparation method for the model drug celecoxib.
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Affiliation(s)
- Daris Grizić
- Department of Pharmaceutics, Institute of Pharmacy, University of Bonn, Gerhard-Domagk-Str. 3, Bonn, Germany
| | - Alf Lamprecht
- Department of Pharmaceutics, Institute of Pharmacy, University of Bonn, Gerhard-Domagk-Str. 3, Bonn, Germany.,PEPITE (EA4267), University of Burgundy/Franche-Comté, Besançon, France
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Hammer L, Furtado S, Mathiowitz E, Auci DL. Oral encapsulated transforming growth factor β1 reduces endogenous levels: Effect on inflammatory bowel disease. World J Gastrointest Pharmacol Ther 2020; 11:79-92. [PMID: 33251033 PMCID: PMC7667406 DOI: 10.4292/wjgpt.v11.i5.79] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 06/18/2020] [Accepted: 10/09/2020] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND TreXTAM® is a combination of the key regulatory cytokine transforming growth factor beta (TGFβ) and all trans retinoic acid (ATRA) microencapsulated for oral delivery to immune structures of the gut. It is in development as a novel treatment for inflammatory bowel disease (IBD).
AIM To measure TGFβ levels in blood and tissue after oral administration of encapsulated TGFβ.
METHODS Animals were orally administered encapsulated TGFβ by gavage. Levels of drug substance in blood and in gut tissues at various times after administration were measured by ELISA.
RESULTS We made the surprising discovery that oral administration of TreXTAM dramatically (approximately 50%) and significantly (P = 0.025) reduced TGFβ levels in colon, but not small intestine or mesenteric lymph nodes. Similarly, levels in rat serum after 25 d of thrice weekly dosing with either TreXTAM, or microencapsulated TGFβ alone (denoted as TPX6001) were significantly (P < 0.01) reduced from baseline levels. When tested in the SCID mouse CD4+CD25- adoptive cell transfer (ACT) model of IBD, oral TPX6001 alone provided only a transient benefit in terms of reduced weight loss.
CONCLUSION These observations suggest a negative feedback mechanism in the gut whereby local delivery of TGFβ results in reduced local and systemic levels of the active form of TGFβ. Our findings suggest potential clinical implications for use of encapsulated TGFβ, perhaps in the context of IBD and/or other instances of fibrosis and/or pathological TGFβ signaling.
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Affiliation(s)
- Laura Hammer
- Department of Research and Development, TherapyX, Buffalo, NY 14214, United States
| | - Stacia Furtado
- Department of Research and Development, TherapyX, Buffalo, NY 14214, United States
- Department of Molecular Pharmacology, Brown University, Providence, RI 02912, United States
| | - Edith Mathiowitz
- Department of Molecular Pharmacology, Brown University, Providence, RI 02912, United States
| | - Dominick L Auci
- Department of Research and Development, TherapyX, Buffalo, NY 14214, United States
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Boel E, Koekoekx R, Dedroog S, Babkin I, Vetrano MR, Clasen C, Van den Mooter G. Unraveling Particle Formation: From Single Droplet Drying to Spray Drying and Electrospraying. Pharmaceutics 2020; 12:pharmaceutics12070625. [PMID: 32635464 PMCID: PMC7408114 DOI: 10.3390/pharmaceutics12070625] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 06/26/2020] [Accepted: 06/29/2020] [Indexed: 12/25/2022] Open
Abstract
Spray drying and electrospraying are well-established drying processes that already have proven their value in the pharmaceutical field. However, there is currently still a lack of knowledge on the fundamentals of the particle formation process, thereby hampering fast and cost-effective particle engineering. To get a better understanding of how functional particles are formed with respect to process and formulation parameters, it is indispensable to offer a comprehensive overview of critical aspects of the droplet drying and particle formation process. This review therefore closely relates single droplet drying to pharmaceutical applications. Although excellent reviews exist of the different aspects, there is, to the best of our knowledge, no single review that describes all steps that one should consider when trying to engineer a certain type of particle morphology. The findings presented in this article have strengthened the predictive value of single droplet drying for pharmaceutical drying applications like spray drying and electrospraying. Continuous follow-up of the particle formation process in single droplet drying experiments hence allows optimization of manufacturing processes and particle engineering approaches and acceleration of process development.
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Affiliation(s)
- Eline Boel
- Department of Pharmaceutical and Pharmacological Sciences, Drug Delivery and Disposition, KU Leuven, 3000 Leuven, Belgium; (E.B.); (S.D.)
| | - Robin Koekoekx
- Department of Chemical Engineering, Soft Matter, Rheology and Technology, KU Leuven, 3001 Leuven, Belgium; (R.K.); (I.B.); (C.C.)
| | - Sien Dedroog
- Department of Pharmaceutical and Pharmacological Sciences, Drug Delivery and Disposition, KU Leuven, 3000 Leuven, Belgium; (E.B.); (S.D.)
| | - Iurii Babkin
- Department of Chemical Engineering, Soft Matter, Rheology and Technology, KU Leuven, 3001 Leuven, Belgium; (R.K.); (I.B.); (C.C.)
| | - Maria Rosaria Vetrano
- Department of Mechanical Engineering, Applied Mechanics and Energy Conversion, KU Leuven, 3001 Leuven, Belgium;
| | - Christian Clasen
- Department of Chemical Engineering, Soft Matter, Rheology and Technology, KU Leuven, 3001 Leuven, Belgium; (R.K.); (I.B.); (C.C.)
| | - Guy Van den Mooter
- Department of Pharmaceutical and Pharmacological Sciences, Drug Delivery and Disposition, KU Leuven, 3000 Leuven, Belgium; (E.B.); (S.D.)
- Correspondence: ; Tel.: +32-16-330304
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Li X, He G, Su F, Chu Z, Xu L, Zhang Y, Zhou J, Ding Y. Regorafenib-loaded poly (lactide-co-glycolide) microspheres designed to improve transarterial chemoembolization therapy for hepatocellular carcinoma. Asian J Pharm Sci 2020; 15:739-751. [PMID: 33363629 PMCID: PMC7750808 DOI: 10.1016/j.ajps.2020.01.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 12/28/2019] [Accepted: 01/18/2020] [Indexed: 02/06/2023] Open
Abstract
Transarterial chemoembolization (TACE) has been widely introduced to treat hepatocellular carcinoma (HCC) especially for unresectable patients for decades. However, TACE evokes an angiogenic response due to the secretion of vascular endothelial growth factor (VEGF), resulting in the formation of new blood vessels and eventually tumor recurrence. Thus, we aimed to develop regorafenib (REGO)-loaded poly (lactide-co-glycolide) (PLGA) microspheres that enabled localized and sustained drug delivery to limit proangiogenic responses following TACE in HCC treatment. REGO-loaded PLGA microspheres were prepared using the emulsion-solvent evaporation/extraction method, in which DMF was selected as an organic phase co-solvent. Accordingly, we optimized the proportion of DMF, which the optimal ratio to DCM was 1:9 (v/v). After preparation, the microspheres provided high drug loading capacity of 28.6%, high loading efficiency of 91.5%, and the average particle size of 149 µm for TACE. IR spectra and XRD were applied to confirming sufficient REGO entrapment. The in vitro release profiles demonstrated sustained drug release of microspheres for more than 30 d To confirm the role of REGO-loaded microspheres in TACE, the cell cytotoxic activity on HepG2 cells and anti-angiogenic effects in HUVECs Tube-formation assay were studied in combination with miriplatin. Moreover, the microspheres indicated the potential of antagonizing miriplatin resistance of HepG2 cells in vitro. Pharmacokinetics preliminary studies exhibited that REGO could be sustainably released from microspheres for more than 30 d after TACE in vivo. In vivo anti-tumor efficacy was further determined in HepG2 xenograft tumor mouse model, demonstrating that REGO microspheres could improve the antitumor efficacy of miriplatin remarkably compared with miriplatin monotherapy. In conclusion, the obtained REGO microspheres demonstrated promising therapeutic effects against HCC when combined with TACE.
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Affiliation(s)
- Xiang Li
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, China Pharmaceutical University, Nanjing 210009, China.,Anhui Province Institute for Food and Drug Control, Hefei 230051, China
| | - Guangwei He
- Hefei Industrial Pharmaceutical Institute Co Ltd, Hefei 230051, China
| | - Feng Su
- Hefei Industrial Pharmaceutical Institute Co Ltd, Hefei 230051, China
| | - Zhaoxing Chu
- Hefei Industrial Pharmaceutical Institute Co Ltd, Hefei 230051, China
| | - Leiming Xu
- Anhui Province Institute for Food and Drug Control, Hefei 230051, China
| | - Yazhong Zhang
- Anhui Province Institute for Food and Drug Control, Hefei 230051, China
| | - Jianping Zhou
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, China Pharmaceutical University, Nanjing 210009, China
| | - Yang Ding
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, China Pharmaceutical University, Nanjing 210009, China
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Arrighi A, Marquette S, Peerboom C, Denis L, Goole J, Amighi K. Development of PLGA microparticles with high immunoglobulin G-loaded levels and sustained-release properties obtained by spray-drying a water-in-oil emulsion. Int J Pharm 2019; 566:291-298. [DOI: 10.1016/j.ijpharm.2019.05.070] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 05/24/2019] [Accepted: 05/27/2019] [Indexed: 11/24/2022]
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Yeap EWQ, Acevedo AJ, Khan SA. Microfluidic Extractive Crystallization for Spherical Drug/Drug-Excipient Microparticle Production. Org Process Res Dev 2019. [DOI: 10.1021/acs.oprd.8b00432] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Eunice W. Q. Yeap
- BioSystems and Micromechanics, Singapore-MIT Alliance for Research and Technology, 1 CREATE Way, #04-13/14, Enterprise Wing, Singapore 138602, Singapore
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore
| | - Andrew J. Acevedo
- Department of Biomedical Engineering, Boston University, 44 Cummington Street, Boston, Massachusetts 02215, United States
| | - Saif A. Khan
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore
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Al-Khattawi A, Bayly A, Phillips A, Wilson D. The design and scale-up of spray dried particle delivery systems. Expert Opin Drug Deliv 2017; 15:47-63. [DOI: 10.1080/17425247.2017.1321634] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
| | - Andrew Bayly
- School of Chemical and Process Engineering, University of Leeds, Leeds, UK
| | | | - David Wilson
- Chemical Development, AstraZeneca, Macclesfield, UK
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13
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Lavra ZMM, Pereira de Santana D, Ré MI. Solubility and dissolution performances of spray-dried solid dispersion of Efavirenz in Soluplus. Drug Dev Ind Pharm 2016; 43:42-54. [DOI: 10.1080/03639045.2016.1205598] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Zênia Maria Maciel Lavra
- Mines Albi, CNRS, Centre RAPSODEE, Campus Jarlard, Université de Toulouse, Albi, France
- Department of Pharmaceutics Sciences, Faculty of Pharmacy, Federal University of Pernambuco, Pernambuco, PE, Brazil
| | - Davi Pereira de Santana
- Department of Pharmaceutics Sciences, Faculty of Pharmacy, Federal University of Pernambuco, Pernambuco, PE, Brazil
| | - Maria Inês Ré
- Mines Albi, CNRS, Centre RAPSODEE, Campus Jarlard, Université de Toulouse, Albi, France
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14
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Inguva PK, Ooi SM, Desai PM, Heng PW. Encapsulation of volatiles by homogenized partially-cross linked alginates. Int J Pharm 2015; 496:709-16. [DOI: 10.1016/j.ijpharm.2015.11.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2015] [Revised: 10/18/2015] [Accepted: 11/09/2015] [Indexed: 10/22/2022]
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15
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Ghasemian E, Vatanara A, Rouini MR, Rouholamini Najafabadi A, Gilani K, Lavasani H, Mohajel N. Inhaled sildenafil nanocomposites: lung accumulation and pulmonary pharmacokinetics. Pharm Dev Technol 2015; 21:961-971. [DOI: 10.3109/10837450.2015.1086369] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Elham Ghasemian
- Pharmaceutics Department, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran and
| | - Alireza Vatanara
- Pharmaceutics Department, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran and
| | - Mohammad Reza Rouini
- Pharmaceutics Department, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran and
| | | | - Kambiz Gilani
- Pharmaceutics Department, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran and
| | - Hoda Lavasani
- Pharmaceutics Department, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran and
| | - Nasir Mohajel
- Department of Virology, Pasteur Institute of Iran, Tehran, Iran
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Kim SY, Hwang JY, Seo JW, Shin US. Production of CNT-taxol-embedded PCL microspheres using an ammonium-based room temperature ionic liquid: As a sustained drug delivery system. J Colloid Interface Sci 2015; 442:147-53. [DOI: 10.1016/j.jcis.2014.11.044] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Revised: 11/15/2014] [Accepted: 11/17/2014] [Indexed: 11/25/2022]
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17
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Bohr A, Wan F, Kristensen J, Dyas M, Stride E, Baldursdottír S, Edirisinghe M, Yang M. Pharmaceutical microparticle engineering with electrospraying: the role of mixed solvent systems in particle formation and characteristics. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2015; 26:61. [PMID: 25631263 DOI: 10.1007/s10856-015-5379-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Accepted: 09/15/2014] [Indexed: 06/04/2023]
Abstract
Microparticles of Celecoxib, dispersed in a matrix of poly(lactic-co-glycolic acid) (PLGA), were prepared by electrospraying using different solvent mixtures to investigate the influence upon particle formation and the resulting particle characteristics. Mixtures consisting of a good solvent, acetone, and an anti-solvent, methanol, for PLGA were studied in different ratios. Properties of the spraying solutions were examined and the resulting microparticles were characterized with regard to size, morphology, porosity, solid state form, surface chemistry and drug release. Particle formation was strongly influenced by the polymer molecular conformation during droplet formation and by the anti-solvent concentration during droplet drying. A strong correlation was found between particle morphology and the solubility of the polymer in the solvent mixtures. The lack of chain entanglements in droplets containing anti-solvent resulted in compact polymer conformation and grain-like particle morphology. Further, the early precipitation of polymer and low chain interaction with increasing content of anti-solvent resulted in surface enrichment of drug (from 10 and 20% up to 41 and 57% respectively), also demonstrated by the increasingly higher drug release rates. The results demonstrate the importance of solvent composition in particle preparation and indicate potential for exploiting this dependence to improve pharmaceutical particle design and performance.
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Affiliation(s)
- Adam Bohr
- Department of Pharmacy, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark,
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Arici M, Topbas O, Karavana SY, Ertan G, Sariisik M, Ozturk C. Preparation of naproxen-ethyl cellulose microparticles by spray-drying technique and their application to textile materials. J Microencapsul 2014; 31:654-66. [PMID: 24861324 DOI: 10.3109/02652048.2014.913722] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The objective of this study is to develop a new textile-based drug delivery system containing naproxen (NAP) microparticles and to evaluate the potential of the system as the carrier of NAP for topical delivery. Microparticles were prepared by spray-drying using an aqueous ethyl cellulose dispersion. The drug content and entrapment efficiency, particle size and distribution, particle morphology and in vitro drug release characteristics of microparticles were optimized for the application of microparticles onto the textile fabrics. Microparticles had spherical shape in the range of 10-15 μm and a narrow particle size distribution. NAP encapsulated in microparticles was in the amorphous or partially crystalline nature. Microparticles were tightly fixed onto the textile fabrics. In vitro drug release exhibited biphasic release profile with an initial burst followed by a very slow release. Skin permeation profiles were observed to follow near zero-order release kinetics.
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Affiliation(s)
- Mesut Arici
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Ege University , Izmir , Turkey
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19
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Afrasiabi Garekani H, Sedighi S, Sadeghi F. Surelease or organic solution of ethylcellulose in preparation of sustained release theophylline micromatrices or matrices using spray drying technique. Pharm Dev Technol 2013; 20:204-10. [PMID: 24286215 DOI: 10.3109/10837450.2013.860545] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
This study evaluated ethylcellulose (EC) in two forms in preparation of sustained release theophylline microparticles using spray drying. Spray dried (SD) samples at different drug:polymer ratios were prepared using Surelease (SDaq) or organic solutions of ethylcellulose (SDor). Properties of particles (yield, particle morphology, size distribution and release profiles) were examined. Differential scanning calorimetry (DSC) and infrared spectroscopy (IR) studies were performed to track polymorphic changes and/or drug polymer interactions. SD samples were compressed and crushing strengths and release profiles were determined. The yields were in the range of 55-70%. The SD samples were nearly spherical with numerous fine particles attached to their surfaces. The SDor samples showed the smallest particle size. No polymorphism or drug-polymer interaction was observed. Uncompressed SDaq samples showed inadequate sustained release of drug compared to SDor samples. Surelease content did not affect drug release from SDaq samples. Tablets prepared from SDaq were softer and showed some plasticity, while those prepared from SDor exhibited higher crushing strengths. Tablets prepared from SDaq showed sustained release properties while the release of drug from compressed SDor samples were too slow. Overall Surelease was unable to sustain release of theophylline from SDaq microparticles, however, in compacted form showed more appropriate drug release than compacted SDor.
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20
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Kang J, Sah E, Sah H. Applicability of non-halogenated methyl propionate to microencapsulation. J Microencapsul 2013; 31:323-32. [PMID: 24175715 DOI: 10.3109/02652048.2013.843729] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Applicability of methyl propionate to microencapsulation was evaluated with regard to volatility, capability of forming emulsions, and their quality. An emulsion-based technique was then developed to encapsulate progesterone into poly-d,l-lactide-co-glycolide microspheres. Their characteristics were compared with those prepared using ethyl acetate. Our results demonstrated that methyl propionate had greater evaporative tendency and less water miscibility than ethyl acetate did. The former allowed us to prepare good microspheres. Their average volume mean diameter was 68.3 ± 1.7 μm with a span index of 0.91 ± 0.13. Progesterone did not undergo polymorphic transition during microencapsulation, and its encapsulation efficiency ranged from 41.80 ± 1.83 to 85.64 ± 1.95%. Residual methyl propionate in various microspheres was found to be 0.97 ± 0.03 to 1.54 ± 0.07%. Such microsphere characteristics were quite similar to those prepared by the ethyl acetate-based microencapsulation process. Overall, our findings reflect that methyl propionate has a potential to become an invaluable solvent for microencapsulation.
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Affiliation(s)
- Jukyung Kang
- College of Pharmacy, Ewha Womans University , Seoul , Korea and
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21
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Organic solution versus aqueous dispersion of Eudragit RS in preparation of sustained release microparticles of theophylline using spray drying. Colloids Surf B Biointerfaces 2013; 108:374-9. [DOI: 10.1016/j.colsurfb.2013.03.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2012] [Revised: 02/04/2013] [Accepted: 03/05/2013] [Indexed: 11/21/2022]
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22
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Critical Solvent Properties Affecting the Particle Formation Process and Characteristics of Celecoxib-Loaded PLGA Microparticles via Spray-Drying. Pharm Res 2012; 30:1065-76. [DOI: 10.1007/s11095-012-0943-x] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Accepted: 11/19/2012] [Indexed: 10/27/2022]
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23
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Bohr A, Yang M, Baldursdóttir S, Kristensen J, Dyas M, Stride E, Edirisinghe M. Particle formation and characteristics of Celecoxib-loaded poly(lactic-co-glycolic acid) microparticles prepared in different solvents using electrospraying. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.05.002] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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24
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Lee WL, Loo SCJ. Revolutionizing drug delivery through biodegradable multilayered particles. J Drug Target 2012; 20:633-47. [PMID: 22738195 DOI: 10.3109/1061186x.2012.702772] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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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25
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Lee H, Lee S, Bhattacharjee H, Sah H. Application of acid-catalyzed hydrolysis of dispersed organic solvent in developing new microencapsulation process technology. J Microencapsul 2012; 29:380-7. [PMID: 22299629 DOI: 10.3109/02652048.2011.651502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The aim of this study was to evaluate a new microencapsulation technology employing an acid-catalyzed solvent extraction method in conjunction to an emulsion-based microencapsulation process. Its process consisted of emulsifying a dispersed phase of poly(D,L-lactide-co-glycolide) and isopropyl formate in an aqueous phase. This step was followed by adding hydrochloric acid to the resulting oil-in-water emulsion, in order to initiate the hydrolysis of isopropyl formate dissolved in the aqueous phase. Its hydrolysis caused the liberation of water-soluble species, that is, isopropanol and formic acid. This event triggered continual solvent leaching out of emulsion droplets, thereby initiating microsphere solidification. This new processing worked well for encapsulation of progesterone and ketoprofen that were chosen as a nonionizable model drug and a weakly acidic one, respectively. Furthermore, the structural integrity of poly(D,L-lactide-co-glycolide) was retained during microencapsulation. The new microencapsulation technology, being conceptually different from previous approaches, might be useful in preparing various polymeric particles.
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Affiliation(s)
- Honghwa Lee
- College of Pharmacy, Ewha Womans University, 11-1 Daehyun-dong, Seodaemun-gu, Seoul 120-750, Korea
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26
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Abstract
Nanostructured particulate materials are expected to revolutionize diagnostics and the delivery of therapeutics for healthcare. To date, chemistry-derived solutions have been the major focus in the design of materials to control interactions with biological systems. Only recently has control over a new set of physical parameters, including size, shape, and rigidity, been explored to optimize the biological response and the in vivo performance of nanoengineered delivery vectors. This Review highlights the methods used to manipulate the physical properties of particles and the relevance of these physical properties to cellular and circulatory interactions. Finally, the importance of future work to synergistically tailor both physical and chemical properties of particulate materials is discussed, with the aim of improving control over particle interactions in the biological domain.
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Affiliation(s)
- James P Best
- Department of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
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Anton N, Jakhmola A, Vandamme TF. Trojan microparticles for drug delivery. Pharmaceutics 2012; 4:1-25. [PMID: 24300177 PMCID: PMC3834908 DOI: 10.3390/pharmaceutics4010001] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2011] [Revised: 12/20/2011] [Accepted: 01/04/2012] [Indexed: 11/29/2022] Open
Abstract
During the last decade, the US Food and Drug Administration (FDA) have regulated a wide range of products, (foods, cosmetics, drugs, devices, veterinary, and tobacco) which may utilize micro and nanotechnology or contain nanomaterials. Nanotechnology allows scientists to create, explore, and manipulate materials in nano-regime. Such materials have chemical, physical, and biological properties that are quite different from their bulk counterparts. For pharmaceutical applications and in order to improve their administration (oral, pulmonary and dermal), the nanocarriers can be spread into microparticles. These supramolecular associations can also modulate the kinetic releases of drugs entrapped in the nanoparticles. Different strategies to produce these hybrid particles and to optimize the release kinetics of encapsulated drugs are discussed in this review.
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Affiliation(s)
- Nicolas Anton
- Laboratoire de Conception et d'Applications de Molécules Bioactives, Faculty of Pharmacy, University of Strasbourg, CNRS 7199, 74 route du Rhin, 67400 Illkirch, France.
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Lee WL, Widjaja E, Loo SCJ. Designing drug-loaded multi-layered polymeric microparticles. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 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] [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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Formulation optimization of sustained-release ammonio methacrylate copolymer microspheres. Effects of log p and concentration of polar cosolvents, and role of the drug/copolymer ratio. Pharmaceutics 2011; 3:830-47. [PMID: 24309310 PMCID: PMC3857060 DOI: 10.3390/pharmaceutics3040830] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Revised: 10/11/2011] [Accepted: 10/27/2011] [Indexed: 11/16/2022] Open
Abstract
The objectives of this work were the formulation optimization of the preparation process parameters and to evaluate spray-dried sustained-release microspheres using ammonio methacrylate copolymer (AMC) as a polymer matrix. The effects of log P and the concentrations of the cosolvents (acetone, methyl ethyl ketone and n-butyl acetate) and different drug/copolymer ratios as independent variables on the physicochemical parameters (the W1/O emulsion viscosity, the microsphere production yield, the average particle size, the encapsulation efficiency) and the cumulative in vitro drug release as dependent variables were studied. The optimization was carried out on the basis of the 33 factorial design study. The optimization process results showed that addition of polar cosolvents proved effective, linear relationships were observed between the independent and the dependent variables. The best conditions were achieved by microspheres prepared by using a low/medium cosolvent log P, cosolvent concentration of 25-50% v/v and a drug/copolymer ratio of 1:16. The microspheres ensured sustained release with Nernst and Baker-Lonsdale release profiles.
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30
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Jang J, Sah H. Nonhalogenated solvent-based solvent evaporation process useful in preparation of PLGA microspheres. J Microencapsul 2011; 28:490-8. [DOI: 10.3109/02652048.2011.586066] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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31
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Peres I, Rocha S, Gomes J, Morais S, Pereira MC, Coelho M. Preservation of catechin antioxidant properties loaded in carbohydrate nanoparticles. Carbohydr Polym 2011. [DOI: 10.1016/j.carbpol.2011.04.029] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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32
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Rizi K, Green RJ, Khutoryanskaya O, Donaldson M, Williams AC. Mechanisms of burst release from pH-responsive polymeric microparticles. J Pharm Pharmacol 2011; 63:1141-55. [PMID: 21827486 DOI: 10.1111/j.2042-7158.2011.01322.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVES Microencapsulation of drugs into preformed polymers is commonly achieved through solvent evaporation techniques or spray drying. We compared these encapsulation methods in terms of controlled drug release properties of prepared microparticles and investigated the underlying mechanisms responsible for the 'burst release' effect. METHODS Using two different pH-responsive polymers with a dissolution threshold of pH 6 (Eudragit L100 and AQOAT AS-MG), hydrocortisone, a model hydrophobic drug, was incorporated into microparticles below and above its solubility within the polymer matrix. KEY FINDINGS Although, spray drying was an attractive approach due to rapid particle production and relatively low solvent waste, the oil-in-oil microencapsulation method was superior in terms of controlled drug release properties from the microparticles. Slow solvent evaporation during the oil-in-oil emulsification process allowed adequate time for drug and polymer redistribution in the microparticles and reduced uncontrolled drug burst release. Electron microscopy showed that this slower manufacturing procedure generated nonporous particles whereas thermal analysis and X-ray diffractometry showed that drug loading above the solubility limit of the drug in the polymer generated excess crystalline drug on the surface of the particles. Raman spectral mapping illustrated that drug was homogeneously distributed as a solid solution in the particles when loaded below saturation in the polymer with consequently minimal burst release. CONCLUSIONS Both the manufacturing method (which influenced particle porosity and density) and drug:polymer compatibility and loading (which affected drug form and distribution) were responsible for burst release seen from our particles.
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Affiliation(s)
- Khalida Rizi
- Reading School of Pharmacy, University of Reading, Whiteknights, Reading, UK
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33
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Rizi K, Green RJ, Donaldson M, Williams AC. Production of pH-Responsive Microparticles by Spray Drying: Investigation of Experimental Parameter Effects on Morphological and Release Properties. J Pharm Sci 2011; 100:566-79. [DOI: 10.1002/jps.22291] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2010] [Revised: 05/06/2010] [Accepted: 06/08/2010] [Indexed: 11/07/2022]
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34
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Dürrigl M, Kwokal A, Hafner A, Šegvić Klarić M, Dumičić A, Cetina-Čižmek B, Filipović-Grčić J. Spray dried microparticles for controlled delivery of mupirocin calcium: Process–tailored modulation of drug release. J Microencapsul 2011; 28:108-21. [DOI: 10.3109/02652048.2010.535620] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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35
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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 (WEINHEIM AN DER BERGSTRASSE, GERMANY) 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] [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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36
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2009] [Revised: 12/30/2009] [Indexed: 11/08/2022]
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37
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Aerosol Flow Reactor Method for the Synthesis of Multicomponent Drug Nano- and Microparticles. ACTA ACUST UNITED AC 2009. [DOI: 10.1201/9781420008449.ch8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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38
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Widjaja E, Lee WL, Loo SCJ. Application of Raman Microscopy to Biodegradable Double-Walled Microspheres. Anal Chem 2009; 82:1277-82. [DOI: 10.1021/ac9022549] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Effendi Widjaja
- Process Science and Modeling, Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research (ASTAR), 1 Pesek Rd, Jurong Island, Singapore 627833, and School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
| | - Wei Li Lee
- Process Science and Modeling, Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research (ASTAR), 1 Pesek Rd, Jurong Island, Singapore 627833, and School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
| | - Say Chye Joachim Loo
- Process Science and Modeling, Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research (ASTAR), 1 Pesek Rd, Jurong Island, Singapore 627833, and School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
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39
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Al-Obaidi H, Brocchini S, Buckton G. Anomalous properties of spray dried solid dispersions. J Pharm Sci 2009; 98:4724-37. [DOI: 10.1002/jps.21782] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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40
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Hafner A, Filipović-Grcić J, Voinovich D, Jalsenjak I. Development and In Vitro Characterization of Chitosan-based Microspheres for Nasal Delivery of Promethazine. Drug Dev Ind Pharm 2008; 33:427-36. [PMID: 17523007 DOI: 10.1080/03639040600920309] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Conventional and composed promethazine-loaded microspheres were prepared by spray drying of chitosan solution systems and double water-in-oil-in-water (W/O/W) emulsion systems, respectively. Double emulsions were prepared in two different feed concentrations, with chitosan dissolved in both water phases, and ethylcellulose dissolved in oil phase. Swelling and bioadhesive properties of the microspheres depended on the chitosan content, type and the feed concentration of spray-dried system. Results obtained suggested that better ethylcellulose microcapsules with promethazine in the chitosan matrix were formed when less concentrated emulsion systems were spray-dried. Thus, in case of such a system, with ethylcellulose/chitosan weight ratio of 1:2, prolonged promethazine release was obtained.
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Affiliation(s)
- Anita Hafner
- Department of Pharmaceutics, Faculty of Pharmacy and Biochemistry, University of Zagreb, Zagreb, Croatia.
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41
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Alexander L, Dhaliwal K, Simpson J, Bradley M. Dunking doughnuts into cells--selective cellular translocation and in vivo analysis of polymeric micro-doughnuts. Chem Commun (Camb) 2008:3507-9. [PMID: 18654695 DOI: 10.1039/b805323e] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Micron-sized polymeric "doughnuts" prepared via dispersion polymerization were found to be highly selective in their cellular translocation abilities.
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Affiliation(s)
- Lois Alexander
- School of Chemistry, Joseph Black Building, Kings Buildings, West Mains Road, Edinburgh, UK
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42
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Morello AP, Burrill R, Mathiowitz E. Preparation and characterization of poly(methyl methacrylate) - iron (III) oxide microparticles using a modified solvent evaporation method. J Microencapsul 2008; 24:476-91. [PMID: 17578736 DOI: 10.1080/02652040701352513] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
At present, there is widespread interest in developing new, biocompatible microparticles made from polymers such as poly(methyl methacrylate) (PMMA) that could have applications ranging from diagnostic imaging to drug delivery. In these experiments, there were two primary objectives: (1) to stabilize a suspension of iron (III) oxide (alpha-Fe(2)O(3); mean diameter = 100 nm) nanoparticles in a solution of PMMA by using an emulsifier and different mixtures of two miscible solvents; and (2) to fabricate PMMA-alpha-Fe(2)O(3) microparticles by using an oil-in-water (o/w) solvent evaporation method. By accomplishing the first objective, it was hypothesized that the encapsulation efficiency of alpha-Fe(2)O(3) within PMMA microparticles would improve and induce the clustering of alpha-Fe(2)O(3) along the circumferential edges of the microparticles. Of the seven emulsifiers tested, Tween 80 was selected primarily for its hydrophilicity and its ability to produce a stable alpha-Fe(2)O(3) dispersion. As a result, 22 batches of microspheres (11 with Tween 80 and 11 without) were made and the solvent (dichloromethane) to co-solvent (ethyl acetate) ratios were varied. Particles made with solvent mixtures of >50% ethyl acetate (<50% dichloromethane) were more likely to be hollow and had larger mean volumetric particle diameters (>5 microns) than particles made with mixtures containing >50% dichloromethane. Particles made with Tween 80 were larger, more porous, and had alpha-Fe(2)O(3) aligned along the circumferential edges of the particles. The use of solvent mixtures did not improve the encapsulation efficiency of alpha-Fe(2)O(3) but the use of ethyl acetate helped to induce the clustering of alpha-Fe(2)O(3) along the peripheries of the microparticles.
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Affiliation(s)
- A Peter Morello
- Department of Molecular Pharmacology, Physiology and Biotechnology, Brown University, Providence, RI 02912, USA
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43
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Abstract
This review covers recent developments in the area of particle engineering via spray drying. The last decade has seen a shift from empirical formulation efforts to an engineering approach based on a better understanding of particle formation in the spray drying process. Microparticles with nanoscale substructures can now be designed and their functionality has contributed significantly to stability and efficacy of the particulate dosage form. The review provides concepts and a theoretical framework for particle design calculations. It reviews experimental research into parameters that influence particle formation. A classification based on dimensionless numbers is presented that can be used to estimate how excipient properties in combination with process parameters influence the morphology of the engineered particles. A wide range of pharmaceutical application examples—low density particles, composite particles, microencapsulation, and glass stabilization—is discussed, with specific emphasis on the underlying particle formation mechanisms and design concepts.
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44
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Champion JA, Katare YK, Mitragotri S. Particle shape: a new design parameter for micro- and nanoscale drug delivery carriers. J Control Release 2007; 121:3-9. [PMID: 17544538 PMCID: PMC4009069 DOI: 10.1016/j.jconrel.2007.03.022] [Citation(s) in RCA: 812] [Impact Index Per Article: 47.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2007] [Accepted: 03/30/2007] [Indexed: 10/23/2022]
Abstract
Encapsulation of therapeutic agents in polymer particles has been successfully used in the development of new drug carriers. A number of design parameters that govern the functional behavior of carriers, including the choice of polymer, particle size and surface chemistry, have been tuned to optimize their performance in vivo. However, particle shape, which may also have a strong impact on carrier performance, has not been thoroughly investigated. This is perhaps due to the limited availability of techniques to produce non-spherical polymer particles. In recent years, a number of reports have emerged to directly address this bottleneck and initial studies have indeed confirmed that particle shape can significantly impact the performance of polymer drug carriers. This article provides a review of this field with respect to methods of particle preparation and the role of particle shape in drug delivery.
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Affiliation(s)
- Julie A Champion
- Department of Chemical Engineering, University of California, Santa Barbara, CA 93106, United States
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Kwon MJ, Bae JH, Kim JJ, Na K, Lee ES. Long acting porous microparticle for pulmonary protein delivery. Int J Pharm 2007; 333:5-9. [PMID: 17296275 DOI: 10.1016/j.ijpharm.2007.01.016] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2006] [Revised: 09/25/2006] [Accepted: 01/15/2007] [Indexed: 10/23/2022]
Abstract
This study investigated the porous-microparticle (PM) with low mass density and large size for pulmonary drug delivery. PM was prepared by the water-in-oil-in-water (W(1)/O/W(2)) multi-emulsion method with cyclodextrin derivative as a porogen and a stabilizer of peptide drugs. Herein, sucrose ethyl acetate (SAIB) was incorporated in PM for long acting protein release. In vitro release studies, the rapid release rate of proteins from PM was reduced due to the high viscosity of the added SAIB. As a result, BSA release from PM continued up to 7 days. This result suggests that PM having sustained release characteristics may be successfully applied for long-term pulmonary administration of protein or peptide drug. In addition, it is expected that these particles arrive at a deep lung epithelium due to low density (high porosity) and limit macrophage recognition because of big particle size (more than 5 microm).
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Affiliation(s)
- Min Jung Kwon
- Pharmaceutical and Health Research Institute, Amore Pacific Corporation/R&D Center, 314-1, Bora-dong, Giheung-gu, Yongin-si, Gyeonggi-do 446-729, Republic of Korea
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46
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Giovagnoli S, Blasi P, Schoubben A, Rossi C, Ricci M. Preparation of large porous biodegradable microspheres by using a simple double-emulsion method for capreomycin sulfate pulmonary delivery. Int J Pharm 2006; 333:103-11. [PMID: 17079101 DOI: 10.1016/j.ijpharm.2006.10.005] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2006] [Revised: 10/03/2006] [Accepted: 10/03/2006] [Indexed: 11/30/2022]
Abstract
The aim of this work was to evaluate if a simple double-emulsion method could be used for developing a new formulation of large porous microspheres (MS) potentially useful for capreomycin sulfate (CS) pulmonary delivery. Poly(DL-lactide-co-glycolide) was used for MS preparation. A simple W/O/W double-emulsion/solvent evaporation preparation method was employed and MS were characterized by UV spectrophotometry, particle size, and scanning electron microscopy. A computer-generated response surface method (RSM) was employed to evaluate % drug content, volume mean diameter (VMD), and span upon variation of two numeric and two categorical factors. MS size distribution was found to be strongly affected by the homogenization method and the type of emulsifier employed. Mean diameters ranged from 1 to 20 microm. The MS presented a proper morphology, with a highly porous interior and a rough surface. Peptide content ranged between 1 and 20%. The region of optimality was referred to as a low VMD and span values, and a high drug content. The best results were found when using a 20% loading, 19.8-3.2 dichloromethane/acetone ratio, ultraturrax mixing, and HPMC as emulsifier. The double-emulsion method allowed the preparation of CS loaded large porous MS having suitable characteristics to match respirability requirements. The use of RSM helped to establish the conditions to obtain formulations potentially useful for a possible CS pulmonary delivery, by using a simple preparation method with a consistent time, cost, and material saving.
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MESH Headings
- Acetone/chemistry
- Administration, Inhalation
- Antibiotics, Antitubercular/administration & dosage
- Antibiotics, Antitubercular/chemistry
- Capreomycin/administration & dosage
- Capreomycin/chemistry
- Chemistry, Pharmaceutical
- Drug Carriers
- Drug Compounding
- Emulsifying Agents/chemistry
- Emulsions
- Hypromellose Derivatives
- Lactic Acid/chemistry
- Methylcellulose/analogs & derivatives
- Methylcellulose/chemistry
- Methylene Chloride/chemistry
- Microscopy, Electron, Scanning
- Microspheres
- Models, Chemical
- Models, Statistical
- Oils/chemistry
- Particle Size
- Polyglycolic Acid/chemistry
- Polylactic Acid-Polyglycolic Acid Copolymer
- Polymers/chemistry
- Porosity
- Predictive Value of Tests
- Reproducibility of Results
- Spectrophotometry, Ultraviolet
- Surface Properties
- Technology, Pharmaceutical
- Water/chemistry
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Affiliation(s)
- Stefano Giovagnoli
- Department of Chemistry and Technology of Drugs, Università degli Studi di Perugia, Via del Liceo 1, 06123 Perugia, Italy.
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Naraharisetti PK, Guan Lee HC, Fu YC, Lee DJ, Wang CH. In vitro and in vivo release of gentamicin from biodegradable discs. J Biomed Mater Res B Appl Biomater 2006; 77:329-37. [PMID: 16506178 DOI: 10.1002/jbm.b.30374] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Osteomyelitis is an infection of the bone and successful treatment involves the removal of the affected bone and the tissue by a surgical procedure following prolonged systemic and local antibiotic therapy for 4 to 6 weeks. The current local treatment is done by poly methyl methacrylate (PMMA) beads loaded with gentamicin and PMMA, being nondegradable, is to be removed by a second surgical procedure. The current study aims to develop a biodegradable composition that gives sustained release and hence reducing the need for a second surgery. Gentamicin-loaded discs were produced by compressing microparticle-gentamicin mixture obtained by spray drying a mixture of gentamicin in a solution of a biodegradable polymer. Different copolymers of poly (DL-lactic-co-glycolic acid) (PLGA) were used to study the effect of copolymer ratio and the hydrophilic-hydrophobic nature of the polymer. Theoretical drug loading up to 25% were studied and it was observed that 10% drug loading was optimum for gentamicin to be used as solid in spray drying. The results showed that about 60% of the drug is released in about 5 to 6 days and the remaining drug is released in about 30 days in total. An in vivo study was carried on rabbit femur and the local area and systemic concentration of gentamicin was monitored. It was observed that the local area concentration of gentamicin was above minimum inhibitory concentration for more than 20 days and this was also validated by computer simulations.
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Affiliation(s)
- Pavan Kumar Naraharisetti
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576, Singapore
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Dai C, Wang B, Zhao H, Li B, Wang J. Preparation and characterization of liposomes-in-alginate (LIA) for protein delivery system. Colloids Surf B Biointerfaces 2006; 47:205-10. [PMID: 16446077 DOI: 10.1016/j.colsurfb.2005.07.013] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2005] [Accepted: 07/22/2005] [Indexed: 11/22/2022]
Abstract
This paper describes the preparation and characterization of a novel drug delivery system for protein, liposomes-in-alginate (LIA) of biodegradable polymers, which is conceived from a combination of the polymer and the lipid-based delivery systems. LIA were prepared by first entrapping bovine serum albumin (BSA), a model protein within multivesicular liposomes (MVLs) by double emulsification process, which are then encapsulated within alginate hydrogel microcapsule, with untrapped BSA which are added during preparation of MVLs. Factors impacting encapsulation efficiency of MVLs are investigated and release of protein from the microcapsules in vitro is studied. At the same time, characterization of MVLs, microcapsules encapsulated protein formulation and integrality analyse of BSA in microcapsules are also studied, with the aim of improving the entrapment efficiency and prolonging release time. It is found that encapsulation efficiency and size of MVLs are affected by the composition and fabrication parameters of LIA. The data also show LIA have high encapsulation efficiency (up to 95%), little chemical change in drug caused by the formulation process, narrow particle size distribution and spherical particle morphology. Drug release assays conducted in vitro indicates that these formulations provide sustained release of encapsulated drug over a period, about 2 weeks.
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Affiliation(s)
- Chuanyun Dai
- Key Laboratory of Biomechanics & Tissue Engineering Under the Sate Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400044, PR China
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The effect of complexation on characteristics and drug release from PLGA microspheres loaded by cyclosporine-cyclodextrin complex. J Drug Deliv Sci Technol 2006. [DOI: 10.1016/s1773-2247(06)50063-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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50
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Abstract
With advances in biotechnology, genomics, and combinatorial chemistry, a wide variety of new, more potent and specific therapeutics are being created. Because of common problems such as low solubility, high potency, and/or poor stability of many of these new drugs, the means of drug delivery can impact efficacy and potential for commercialization as much as the nature of the drug itself. Thus, there is a corresponding need for safer and more effective methods and devices for drug delivery. Indeed, drug delivery systems—designed to provide a therapeutic agent in the needed amount, at the right time, to the proper location in the body, in a manner that optimizes efficacy, increases compliance and minimizes side effects—were responsible for $47 billion in sales in 2002, and the drug delivery market is expected to grow to $67 billion by 2006.
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Affiliation(s)
- Mauro Ferrari
- Department of Biomedical Engineering, University of Texas Health Science Center, Houston, TX ,University of Texas M.D. Anderson Cancer Center, Houston, TX ,Rice University, Houston, TX ,University of Texas Medical Branch, Galveston, TX ,Texas Alliance for NanoHealth, Houston, TX
| | - Abraham P. Lee
- Biomedical Engineering, University of California, Irvine
| | - L. James Lee
- Chemical and Biomolecular Engineering, The Ohio State University, USA
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