101
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Paclitaxel-loaded Pluronic nanoparticles formed by a temperature-induced phase transition for cancer therapy. J Control Release 2010; 148:344-50. [PMID: 20797418 DOI: 10.1016/j.jconrel.2010.08.021] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2010] [Revised: 08/12/2010] [Accepted: 08/14/2010] [Indexed: 11/22/2022]
Abstract
We prepared nanoparticles by a temperature-induced phase transition in a mixture of Pluronic F-68 and liquid PEG (polyethylene glycol, molecular weight: 400) containing paclitaxel (PTX) with a fast, simple, continuous and solvent-free process. The liquid PEG is used as solubilizer of PTX and the polymer for the encapsulation of PTX is composed of Pluronic F-68. At the phase transition temperature, the polymer mixture was changed to the liquid phase, and stirring the liquid 0 °C to form Pluronic nanoparticles. The morphology and size distribution of the prepared Pluronic nanoparticles were observed using FE-SEM and TEM, and a particle size analyzer and cryo-TEM were used to observe the shape of paclitaxel-loaded Pluronic nanoparticles in an aqueous state. To apply Pluronic nanoparticles as a delivery system for cancer therapy, the release pattern of PTX, a model anti-cancer drug, was observed and the tumor growth was monitored by injecting the PTX-loaded Pluronic nanoparticles into the tail veins of tumor-bearing mice. We also evaluated the time-dependent excretion profile, in vivo biodistribution, circulation time, and tumor targeting ability of PTX-loaded Pluronic nanoparticles using non-invasive live animal imaging technology. In the early stage within 7h of release, the loaded PTX was rapidly released and the sustained release was observed for up to 48 h. In vivo studies, PTX-loaded Pluronic nanoparticles were observed with higher anti-tumor efficacy compared with PTX formulated in Cremophor EL.
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102
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Understanding the influence of powder flowability, fluidization and de-agglomeration characteristics on the aerosolization of pharmaceutical model powders. Eur J Pharm Sci 2010; 40:412-21. [DOI: 10.1016/j.ejps.2010.04.012] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2009] [Revised: 03/02/2010] [Accepted: 04/20/2010] [Indexed: 11/21/2022]
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103
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Zhou QT, Qu L, Larson I, Stewart PJ, Morton DA. Improving aerosolization of drug powders by reducing powder intrinsic cohesion via a mechanical dry coating approach. Int J Pharm 2010; 394:50-9. [DOI: 10.1016/j.ijpharm.2010.04.032] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2010] [Revised: 04/15/2010] [Accepted: 04/23/2010] [Indexed: 11/28/2022]
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104
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Bose S, Bogner RH. Solventless visible light-curable coating: II. Drug release, mechanical strength and photostability. Int J Pharm 2010; 393:41-7. [DOI: 10.1016/j.ijpharm.2010.03.052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2009] [Revised: 03/22/2010] [Accepted: 03/27/2010] [Indexed: 10/19/2022]
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105
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Abstract
Os polímeros representam uma das classes de materiais mais versáteis disponíveis para aplicações em diversas áreas, inclusive a farmacêutica. Polímeros naturais, naturais modificados e sintéticos são empregados como excipientes farmacêuticos para a formulação de cosméticos e medicamentos de liberação convencional e de liberação modificada. Nos dias atuais, polímeros são desenvolvidos para atuarem como moduladores e direcionadores da liberação de fármacos em sítios específicos no organismo. Polímeros biodegradáveis, bioadesivos, biomiméticos e hidrogéis responsivos têm sido amplamente incluídos em formulações farmacêuticas. Os avanços na idealização de novos Sistemas de Liberação de Fármacos somente são e serão permitidos a partir do desenvolvimento de polímeros projetados especificamente para a área farmacêutica. Neste sentido, o presente artigo visa a revisar e apresentar informações sobre o uso de polímeros em aplicações farmacêuticas que poderão ser úteis no planejamento de novos sistemas com desempenhos superiores.
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106
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Bose S, Bogner RH. Solventless visible light-curable coating: I. Critical formulation and processing parameters. Int J Pharm 2010; 393:32-40. [PMID: 20138131 DOI: 10.1016/j.ijpharm.2010.01.041] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2009] [Revised: 01/25/2010] [Accepted: 01/26/2010] [Indexed: 11/17/2022]
Abstract
Film coating is generally accomplished by spraying polymers dissolved in solvents onto a cascading bed of tablets. The limitations associated with the use of solvents (both aqueous and organic) can be overcome by the use of solventless coating technologies. In this proposed solventless photocurable film coating system, each layer of coating onto the pellets (non-pareil beads) was formed using liquid photocurable monomer, powdered pore-forming agents, photosensitizers and photoinitiators in a mini-coating pan and later cured by visible light. Yield, coating efficiency, variation in color, diameter and roundness were determined for each batch to evaluate process efficiency and coating quality. It was found that the ratio (S/L ratio) of the amount of solid (S) pore-forming agent to volume of liquid (L) monomer, particle size and type of the pore-forming agent, concentration of initiator, and total exposure (light intensity x exposure time) of light were critical formulation and processing parameters for the process. Using lactose as a pore-forming agent, an optimum ratio of pore-forming agent to photocurable polymer was 1.8-3.0 to achieve good process efficiency and uniformity. The ratio was sensitive to particle size and type of pore-forming agent.
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Affiliation(s)
- Sagarika Bose
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Connecticut, 69 North Eagleville Road, Storrs, Connecticut 06269, United States.
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107
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Song W, Möhwald H, Li J. Movement of polymer microcarriers using a biomolecular motor. Biomaterials 2010; 31:1287-92. [DOI: 10.1016/j.biomaterials.2009.10.026] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2009] [Accepted: 10/09/2009] [Indexed: 11/27/2022]
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108
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Chi N, Guo JH, Zhang Y, Zhang W, Tang X. An oral controlled release system for amroxol hydrochloride containing a wax and a water insoluble polymer. Pharm Dev Technol 2010; 15:97-104. [DOI: 10.3109/10837450903013576] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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109
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Zhou Q, Armstrong B, Larson I, Stewart PJ, Morton DA. Effect of host particle size on the modification of powder flow behaviours for lactose monohydrate following dry coating. ACTA ACUST UNITED AC 2009. [DOI: 10.1051/dst/2009046] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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110
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Smart polyelectrolyte microcapsules as carriers for water-soluble small molecular drug. J Control Release 2009; 139:160-6. [DOI: 10.1016/j.jconrel.2009.06.010] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2009] [Revised: 05/20/2009] [Accepted: 06/13/2009] [Indexed: 11/22/2022]
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111
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Development and physicochemical characterization of copper complexes-loaded PLGA nanoparticles. Int J Pharm 2009; 379:226-34. [PMID: 19428198 DOI: 10.1016/j.ijpharm.2009.03.036] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2009] [Revised: 03/17/2009] [Accepted: 03/27/2009] [Indexed: 11/24/2022]
Abstract
PLGA nanoparticles were prepared via a modified W/O/W emulsion solvent diffusion process, in which all formulation components were fully biocompatible and biodegradable. Different independent processing parameters were systematically studied. Nanoparticles were characterized by DLS (particle size, polydispersity, zeta-potential) and TEM/AFM (surface morphology). An optimized formulation was used to encapsulate copper complexes of cyclen and DOTA as potential PET imaging agents. Results showed that the predominant formulation factors appeared to be the lactide-to-glycolide (L:G) ratio of PLGA, the nature of the diffusion phase, and the presence of hydroxyl ions in the first-emulsion aqueous phase. By regulating those 3 parameters, PLGA nanoparticles were prepared with very good preparation yields (>95%), a size less than 200 nm and a polydispersity index less than 0.1. TEM pictures showed nanoparticles with a narrow size distribution, a spherical shape and a smooth surface. The optimized formulation allowed to encapsulate Cu-cyclen and Cu-DOTA complexes with an encapsulation efficiency between 20% and 25%.
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112
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Liang X, King DM, Li P, George SM, Weimer AW. Nanocoating hybrid polymer films on large quantities of cohesive nanoparticles by molecular layer deposition. AIChE J 2009. [DOI: 10.1002/aic.11757] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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113
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Martín del Valle EM, Galán MA, Carbonell RG. Drug Delivery Technologies: The Way Forward in the New Decade. Ind Eng Chem Res 2009. [DOI: 10.1021/ie800886m] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Eva M. Martín del Valle
- Department of Chemical Engineering, University of Salamanca, Pl. de los Caídos s/n, 37008 Salamanca, Spain, and Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina
| | - Miguel A. Galán
- Department of Chemical Engineering, University of Salamanca, Pl. de los Caídos s/n, 37008 Salamanca, Spain, and Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina
| | - Ruben G. Carbonell
- Department of Chemical Engineering, University of Salamanca, Pl. de los Caídos s/n, 37008 Salamanca, Spain, and Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina
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114
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Are pharmaceutics really going supercritical? Int J Pharm 2008; 364:176-87. [DOI: 10.1016/j.ijpharm.2008.05.014] [Citation(s) in RCA: 123] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2008] [Revised: 05/13/2008] [Accepted: 05/13/2008] [Indexed: 11/19/2022]
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115
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116
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Luo Y, Zhu J, Ma Y, Zhang H. Dry coating, a novel coating technology for solid pharmaceutical dosage forms. Int J Pharm 2008; 358:16-22. [DOI: 10.1016/j.ijpharm.2008.03.028] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2007] [Revised: 03/16/2008] [Accepted: 03/19/2008] [Indexed: 11/26/2022]
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117
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Andrews GP, Jones DS, Diak OA, McCoy CP, Watts AB, McGinity JW. The manufacture and characterisation of hot-melt extruded enteric tablets. Eur J Pharm Biopharm 2008; 69:264-73. [DOI: 10.1016/j.ejpb.2007.11.001] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2007] [Revised: 11/01/2007] [Accepted: 11/06/2007] [Indexed: 10/22/2022]
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118
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Polymer blends for controlled release coatings. J Control Release 2008; 125:1-15. [DOI: 10.1016/j.jconrel.2007.09.012] [Citation(s) in RCA: 239] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2007] [Accepted: 09/28/2007] [Indexed: 11/18/2022]
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119
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Bose S, Bogner RH. Solventless photocurable film coating: evaluation of drug release, mechanical strength, and photostability. AAPS PharmSciTech 2007; 8:E57. [PMID: 17915807 DOI: 10.1208/pt0803057] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
A new solventless photocurable film-coating system was investigated in which nonpareil beads were coated in a mini-coating pan with liquid prepolymer (L) and powdered solid pore-forming agents (S) and cured by UV light. Release from the coating could by altered by changing the material, the number of layers, and the coating thickness. Immediate release of a blue dye contained in the nonpareils was obtained with sodium starch glycolate as a pore former that swelled the coating and yielded large pores; through these pores the dye quickly released while leaving behind the scaffold provided by the photocured prepolymer. Simple pore formers (lactose and sodium chloride) dissolved away without swelling and provided a more sustained release. The nature of the scaffold and pore structure of the coating were determined by simultaneously monitoring the release of sodium chloride from the coating and blue dye from the beads. At least 50% of the sodium chloride that was incorporated into the coating released before the dye released through the coating, except at an S/L ratio (ratio of the amount of solid pore-forming agent to the volume of liquid prepolymer) of 2.4, where 40% of the sodium chloride was released before the release of dye. The coupling between dye release and pore formation was found to be dependent on the S/L ratio of the coating. Simulation based on percolation theory showed that the coupling of pore formation and dye release was higher when the variance in tortuosity was lower. The coating was photostable and could withstand normal handling stress.
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