101
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Ke P, Hasegawa S, Al-Obaidi H, Buckton G. Investigation of preparation methods on surface/bulk structural relaxation and glass fragility of amorphous solid dispersions. Int J Pharm 2011; 422:170-8. [PMID: 22079715 DOI: 10.1016/j.ijpharm.2011.10.047] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2011] [Revised: 10/22/2011] [Accepted: 10/22/2011] [Indexed: 11/25/2022]
Abstract
The objective of this study was to investigate the effect of preparation methods on the surface/bulk molecular mobility and glass fragility of solid dispersions. Solid dispersions containing indomethacin and PVP K30 were chosen as the model system. An inverse gas chromatography method was used to determine the surface structural relaxation of the solid dispersions and these data were compared to those for bulk relaxation obtained by DSC. The values of τ(β) for the surface relaxation were 4.6, 7.1 and 1.8h for melt quenched, ball milled and spray dried solid dispersions respectively, compared to 15.6, 7.9 and 9.8h of the bulk. In all systems, the surface had higher molecular mobility than the bulk. The glass fragility of the solid dispersions was also influenced by the preparation methods with the most fragile system showing the best stability. The zero mobility temperature (T(0)) was used to correlate with the physical stability of the solid dispersions. Despite having similar T(g) (65°C), the T(0) of the melt quenched, ball milled and spray dried samples were 21.6, -4.2 and 16.7°C respectively which correlated well with their physical stability results. Therefore, T(0) appears to be a better indicator than T(g) for predicting stability of amorphous materials.
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Affiliation(s)
- Peng Ke
- Department of Pharmaceutics, School of Pharmacy, University of London, 29-39 Brunswick Square, London WC1 N 1AX, UK
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102
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Huang J, Li Y, Wigent RJ, Malick WA, Sandhu HK, Singhal D, Shah NH. Interplay of formulation and process methodology on the extent of nifedipine molecular dispersion in polymers. Int J Pharm 2011; 420:59-67. [DOI: 10.1016/j.ijpharm.2011.08.021] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Revised: 07/25/2011] [Accepted: 08/08/2011] [Indexed: 11/29/2022]
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103
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Bikiaris DN. Solid dispersions, Part II: new strategies in manufacturing methods for dissolution rate enhancement of poorly water-soluble drugs. Expert Opin Drug Deliv 2011; 8:1663-80. [DOI: 10.1517/17425247.2011.618182] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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104
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Bøtker JP, Karmwar P, Strachan CJ, Cornett C, Tian F, Zujovic Z, Rantanen J, Rades T. Assessment of crystalline disorder in cryo-milled samples of indomethacin using atomic pair-wise distribution functions. Int J Pharm 2011; 417:112-9. [DOI: 10.1016/j.ijpharm.2010.12.018] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2010] [Revised: 12/14/2010] [Accepted: 12/15/2010] [Indexed: 10/18/2022]
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105
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Takebe G, Takagi T, Suzuki M, Hiramatsu M. Preparation of polymeric nanoparticles of cyclosporin A using infrared pulsed laser. Int J Pharm 2011; 414:244-50. [DOI: 10.1016/j.ijpharm.2011.05.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Revised: 04/08/2011] [Accepted: 05/01/2011] [Indexed: 12/18/2022]
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106
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Dontireddy R, Crean AM. A comparative study of spray-dried and freeze-dried hydrocortisone/polyvinyl pyrrolidone solid dispersions. Drug Dev Ind Pharm 2011; 37:1141-9. [DOI: 10.3109/03639045.2011.562213] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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107
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Caron V, Tajber L, Corrigan OI, Healy AM. A Comparison of Spray Drying and Milling in the Production of Amorphous Dispersions of Sulfathiazole/Polyvinylpyrrolidone and Sulfadimidine/Polyvinylpyrrolidone. Mol Pharm 2011; 8:532-42. [DOI: 10.1021/mp1003674] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vincent Caron
- School of Pharmacy and Pharmaceutical Sciences, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Lidia Tajber
- School of Pharmacy and Pharmaceutical Sciences, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Owen I. Corrigan
- School of Pharmacy and Pharmaceutical Sciences, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Anne Marie Healy
- School of Pharmacy and Pharmaceutical Sciences, University of Dublin, Trinity College, Dublin 2, Ireland
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108
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Eudragit-coated albumin nanospheres carrying inclusion complexes for oral administration of indomethacin. J INCL PHENOM MACRO 2011. [DOI: 10.1007/s10847-010-9916-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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109
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110
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Engers D, Teng J, Jimenez-Novoa J, Gent P, Hossack S, Campbell C, Thomson J, Ivanisevic I, Templeton A, Byrn S, Newman A. A Solid-State Approach to Enable Early Development Compounds: Selection and Animsal Bioavailability Studies of an Itraconazole Amorphous Solid Dispersion. J Pharm Sci 2010; 99:3901-22. [DOI: 10.1002/jps.22233] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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111
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Jain SP, Singh PP, Javeer S, Amin PD. Use of Placket-Burman statistical design to study effect of formulation variables on the release of drug from hot melt sustained release extrudates. AAPS PharmSciTech 2010; 11:936-44. [PMID: 20509057 DOI: 10.1208/s12249-010-9444-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2009] [Accepted: 04/27/2010] [Indexed: 11/30/2022] Open
Abstract
The present paper was focused on exploiting Plackett-Burman design to screen the effect of nine factors--poly (ethylene oxide) molecular weight (X(1)), poly (ethylene oxide) amount (X(2)), ethylcellulose amount (X(4)), drug solubility (X(5)), drug amount (X(6)), sodium chloride amount (X(7)), citric acid amount (X(8)), polyethylene glycol amount (X(9)), and glycerin amount (X(11)) on the release of drugs from the extended release extrudates, i.e., release rate and release mechanism. The experiments were carried out according to a nine-factor 12-run statistical model and subjected to an 8-h dissolution study in phosphate buffer pH 6.8. The significance of the model was indicated by the ANOVA and the residual analysis. Poly (ethylene oxide) amount, ethylcellulose amount and drug solubility had significant effect on the T90 values whereas poly (ethylene oxide) amount and ethylcellulose amount had significant effect on the n value.
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112
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Graeser KA, Patterson JE, Zeitler JA, Rades T. The Role of Configurational Entropy in Amorphous Systems. Pharmaceutics 2010; 2:224-244. [PMID: 27721353 PMCID: PMC3986718 DOI: 10.3390/pharmaceutics2020224] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2010] [Revised: 05/18/2010] [Accepted: 05/21/2010] [Indexed: 11/19/2022] Open
Abstract
Configurational entropy is an important parameter in amorphous systems. It is involved in the thermodynamic considerations, plays an important role in the molecular mobility calculations through its appearance in the Adam-Gibbs equation and provides information on the solubility increase of an amorphous form compared to its crystalline counterpart. This paper presents a calorimetric method which enables the scientist to quickly determine the values for the configurational entropy at any temperature and obtain the maximum of information from these measurements.
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Affiliation(s)
- Kirsten A Graeser
- School of Pharmacy, University of Otago, Dunedin, New Zealand
- Pharmaceutical Development, GlaxoSmithKline, Harlow, CM19 5AW, UK
| | | | - J Axel Zeitler
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Pembroke Street, Cambridge CB2 3RA, UK
| | - Thomas Rades
- School of Pharmacy, University of Otago, Dunedin, New Zealand.
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113
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Investigation of the milling-induced thermal behavior of crystalline and amorphous griseofulvin. Pharm Res 2010; 27:1377-89. [PMID: 20490628 DOI: 10.1007/s11095-010-0129-3] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2010] [Accepted: 03/22/2010] [Indexed: 10/19/2022]
Abstract
PURPOSE To gain a better understanding of the physical state and the unusual thermal behavior of milled griseofulvin. METHODS Griseofulvin crystals and amorphous melt quench samples were milled in a vibrating ball mill for different times and then analyzed using differential scanning calorimetry (DSC) and powder X-ray diffraction (PXRD). Modulated DSC (mDSC) and annealing studies were done for the milled amorphous samples to further probe the effects of milling. RESULTS Milling of griseofulvin crystals results in decrease in crystallinity and amorphization of the compound. A double peak is seen for crystallization in the DSC, which is also seen for the milled melt quench sample. Both enthalpy and temperature of crystallization decrease for the milled melt quenched sample. Tg is visible under the first peak with the mDSC, and annealing shows that increasing milling time results in faster crystallization upon storage. CONCLUSION Milling of griseofulvin results in the formation of an amorphous form and not a mesophase. It increases the amount of surface created and the overall energy of the amorphous griseofulvin, which leads to a decreased temperature of crystallization. The two exotherms in the DSC are due to some particles having nuclei on the surface.
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114
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DiNunzio JC, Brough C, Miller DA, Williams RO, McGinity JW. Fusion processing of itraconazole solid dispersions by kinetisol dispersing: a comparative study to hot melt extrusion. J Pharm Sci 2010; 99:1239-53. [PMID: 19681106 DOI: 10.1002/jps.21893] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
KinetiSol Dispersing (KSD) is a novel high energy manufacturing process investigated here for the production of pharmaceutical solid dispersions. Solid dispersions of itraconazole (ITZ) and hypromellose were produced by KSD and compared to identical formulations produced by hot melt extrusion (HME). Materials were characterized for solid state properties by modulated differential scanning calorimetry and X-ray diffraction. Dissolution behavior was studied under supersaturated conditions. Oral bioavailability was determined using a Sprague-Dawley rat model. Results showed that KSD was able to produce amorphous solid dispersions in under 15 s while production by HME required over 300 s. Dispersions produced by KSD exhibited single phase solid state behavior indicated by a single glass transition temperature (T(g)) whereas compositions produced by HME exhibited two T(g)s. Increased dissolution rates for compositions manufactured by KSD were also observed compared to HME processed material. Near complete supersaturation was observed for solid dispersions produced by either manufacturing processes. Oral bioavailability from both processes showed enhanced AUC compared to crystalline ITZ. Based on the results presented from this study, KSD was shown to be a viable manufacturing process for the production of pharmaceutical solid dispersions, providing benefits over conventional techniques including: enhanced mixing for improved homogeneity and reduced processing times.
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Affiliation(s)
- James C DiNunzio
- Division of Pharmaceutics, The University of Texas at Austin, 1 University Station A1920, Austin, Texas 78712, USA.
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115
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Graeser KA, Patterson JE, Zeitler JA, Gordon KC, Rades T. Correlating thermodynamic and kinetic parameters with amorphous stability. Eur J Pharm Sci 2009; 37:492-8. [DOI: 10.1016/j.ejps.2009.04.005] [Citation(s) in RCA: 110] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2008] [Revised: 03/20/2009] [Accepted: 04/15/2009] [Indexed: 11/30/2022]
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116
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Shear and extensional rheology of hydroxypropyl cellulose melt using capillary rheometry. J Pharm Biomed Anal 2009; 49:304-10. [DOI: 10.1016/j.jpba.2008.11.014] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2008] [Revised: 09/30/2008] [Accepted: 11/17/2008] [Indexed: 11/21/2022]
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117
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Wiranidchapong C, Tucker IG, Rades T, Kulvanich P. Miscibility and interactions between 17β-estradiol and Eudragit® RS in solid dispersion. J Pharm Sci 2008; 97:4879-88. [DOI: 10.1002/jps.21366] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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118
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Patterson JE, James MB, Forster AH, Rades T. Melt Extrusion and Spray Drying of Carbamazepine and Dipyridamole with Polyvinylpyrrolidone/Vinyl Acetate Copolymers. Drug Dev Ind Pharm 2008; 34:95-106. [DOI: 10.1080/03639040701484627] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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119
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Chen H, Wan J, Wang Y, Mou D, Liu H, Xu H, Yang X. A facile nanoaggregation strategy for oral delivery of hydrophobic drugs by utilizing acid-base neutralization reactions. NANOTECHNOLOGY 2008; 19:375104. [PMID: 21832541 DOI: 10.1088/0957-4484/19/37/375104] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Nanonization strategies have been used to enhance the oral availability of numerous drugs that are poorly soluble in water. Exploring a facile nanonization strategy with highly practical potential is an attractive focus. Here, we report a novel facile nanoaggregation strategy for constructing drug nanoparticles of poorly soluble drugs with pH-dependent solubility by utilizing acid-base neutralization in aqueous solution, thus facilitating the exploration of nanonization in oral delivery for general applicability. We demonstrate that hydrophobic itraconazole dissolved in acid solution formed a growing core and aggregated into nanoparticles in the presence of stabilizers. The nanoparticles, with an average diameter of 279.3 nm and polydispersity index of 0.116, showed a higher dissolution rate when compared with the marketed formulation; the average dissolution was about 91.3%. The in vivo pharmacokinetic studies revealed that the nanoparticles had a rapid absorption and enhanced oral availability. The diet state also showed insignificant impact on the absorption of itraconazole from nanoparticles. This nanoaggregation strategy is a promising nanonization method with a facile process and avoidance of toxic organic solvents for oral delivery of poorly soluble drugs with pH-dependent solubility and reveals a highly practical potential in the pharmaceutical and chemical industries.
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Affiliation(s)
- Huabing Chen
- College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
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120
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Andrews GP. Advances in solid dosage form manufacturing technology. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2007; 365:2935-49. [PMID: 17855217 DOI: 10.1098/rsta.2007.0014] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Currently, the pharmaceutical and healthcare industries are moving through a period of unparalleled change. Major multinational pharmaceutical companies are restructuring, consolidating, merging and more importantly critically assessing their competitiveness to ensure constant growth in an ever-more demanding market where the cost of developing novel products is continuously increasing. The pharmaceutical manufacturing processes currently in existence for the production of solid oral dosage forms are associated with significant disadvantages and in many instances provide many processing problems. Therefore, it is well accepted that there is an increasing need for alternative processes to dramatically improve powder processing, and more importantly to ensure that acceptable, reproducible solid dosage forms can be manufactured. Consequently, pharmaceutical companies are beginning to invest in innovative processes capable of producing solid dosage forms that better meet the needs of the patient while providing efficient manufacturing operations. This article discusses two emerging solid dosage form manufacturing technologies, namely hot-melt extrusion and fluidized hot-melt granulation.
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Affiliation(s)
- Gavin P Andrews
- School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, Northern Ireland, UK.
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