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Rassat M, Ouandji I, Guiblin N, Espeau P. Obtaining two polymorphic forms of paracetamol within the phase diagram with PEG 1500. Eur J Pharm Biopharm 2024; 195:114173. [PMID: 38145856 DOI: 10.1016/j.ejpb.2023.114173] [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: 09/07/2023] [Revised: 12/14/2023] [Accepted: 12/20/2023] [Indexed: 12/27/2023]
Abstract
Studies of the interactions between paracetamol, chosen as model active ingredient, and PEG 1500, a pharmaceutical carrier, are conducted in the solid state. Solid dispersions of PEG 1500 and paracetamol were prepared in different mass ratios. Two temperature cycles are then applied and the characterization is carried out by DSC and X-ray powder diffraction. Following this, a phase diagram is established for each cycle. On second heating, the metastable Form II of paracetamol is obtained within the PEG-based matrix. However, on the second heating, for paracetamol contents higher than 65%, Form I or form II is obtained randomly.
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Affiliation(s)
- Maïlys Rassat
- Université Paris Cité, CNRS, Inserm, UTCBS, F-75006 Paris, France
| | - Ingrid Ouandji
- Astrea Fontaine, Rue des Prés Potets, 21121 Fontaine -lès-Dijon, France
| | - Nicolas Guiblin
- Université Paris-Saclay, CentraleSupélec, CNRS, Laboratoire SPMS, F 91190 Gif-sur-Yvette, France
| | - Philippe Espeau
- Université Paris Cité, CNRS, Inserm, UTCBS, F-75006 Paris, France.
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Enhancing the antidiabetic and antidyslipidemic activity of a 1,5-diarylpyrazole by solid dispersion pre-formulation. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-022-02260-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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3
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Crystal Structural Analysis of DL-Mandelate Salt of Carvedilol and Its Correlation with Physicochemical Properties. CRYSTALS 2020. [DOI: 10.3390/cryst10010053] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A 1:1 salt of carvedilol (CVD), an anti-hypertensive drug, with DL-mandelic acid (DL-MA) was crystallized from ethanol and the structure was characterized by X-ray single-crystal diffraction, revealing salt formation by transfer of an acidic proton from the COOH group of MA to the aliphatic (acyclic) secondary amino NH group of CVD. The crystal structure is triclinic, with a P-1 space group and unit cell parameters a = 9.8416(5) Å, b = 11.4689(5) Å, c = 14.0746(7) Å, α = 108.595(8), β = 95.182(7), γ = 107.323(8), V = 1406.95(15) Å3, and Z = 2. The asymmetric unit contained one protonated CVD and one MA anion, linked via an N+–H∙∙∙O¯ strong hydrogen bond and a ratio of 1:1. As previously reported, the thermal, spectroscopic, and powder X-ray diffraction properties of the salt of CVD with DL-MA (CVD_DL-MA) differed from CVD alone. The intrinsic dissolution rate of CVD_DL-MA was about 10.7 times faster than CVD alone in a pH 6.8 buffer.
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Paudwal G, Rawat N, Gupta R, Baldi A, Singh G, Gupta PN. Recent Advances in Solid Dispersion Technology for Efficient Delivery of Poorly Water-Soluble Drugs. Curr Pharm Des 2019; 25:1524-1535. [DOI: 10.2174/1381612825666190618121553] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 06/11/2019] [Indexed: 11/22/2022]
Abstract
Drug discovery is generally considered as a costly affair and it takes approximately 15 years to reach a
new chemical entity into the market. Among the recent potent drug molecules with most effective pharmacological
properties, very few reached for Phase I clinical trial in humans. Unfortunately, the historical average reveals
an almost 90% overall attrition rate in clinical trials. The solubility and permeability of a drug are the critical
factors influencing the success of a drug. Oral drug delivery systems still continue to exist as the most favored,
simplest and easiest administration route. A huge number of potential clinical candidates won’t make it to the
market or accomplish their maximum capacity except if their solubility and oral bioavailability are enhanced by
formulation. The solubility of drugs will continue to exist as important aspects of formulation development. With
the emergence of synthetic methods for new molecule synthesis in chemistry and better screening methods, the
number of poorly water soluble compounds has dramatically expanded in the last few years. Solid dispersion is
one of the most important techniques as it can be prepared by several methods. It is mostly prepared with a drug
having poor water solubility and it explores hydrophilic polymers either individually or in combination for the
enhancement of solubility. In comparison to the conventional formulations such as tablets or capsules, there are
different methods with which solid dispersions can be prepared and also have many benefits over conventional
drug delivery approaches. Solid dispersion systems are potential for increasing the solubility, oral absorption and
bioavailability of drugs and the significance of the solid dispersion technology is constantly increasing. The main
focus of this review is to present recent advancements in the area of solid dispersion. This review also includes an
account of recent patents on solid dispersion and clinical status of solid dispersion based formulations.
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Affiliation(s)
- Gourav Paudwal
- PK-PD Toxicology & Formulation Division, CSIR-Indian Institute of Integrative Medicine, Jammu, India
| | - Neha Rawat
- Department of Pharmacy, Maharaja Ranjit Singh Punjab Technical University, Bathinda, India
| | - Rahul Gupta
- PK-PD Toxicology & Formulation Division, CSIR-Indian Institute of Integrative Medicine, Jammu, India
| | - Ashish Baldi
- Department of Pharmacy, Maharaja Ranjit Singh Punjab Technical University, Bathinda, India
| | - Gurdarshan Singh
- PK-PD Toxicology & Formulation Division, CSIR-Indian Institute of Integrative Medicine, Jammu, India
| | - Prem N. Gupta
- PK-PD Toxicology & Formulation Division, CSIR-Indian Institute of Integrative Medicine, Jammu, India
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Ali S, Yousaf AM, Raza SA, Shahzad Y, Khan IU, Mahmood T, Hussain T, Manzoor M, Riaz H, Jamshaid M. Preparation and in vitro characterization of polyvinylpyrrolidone-poloxamer polymeric synergy for oral drug delivery. JOURNAL OF POLYMER RESEARCH 2019. [DOI: 10.1007/s10965-019-1839-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Solubility Improvement of Benexate through Salt Formation Using Artificial Sweetener. Pharmaceutics 2018; 10:pharmaceutics10020064. [PMID: 29861459 PMCID: PMC6027452 DOI: 10.3390/pharmaceutics10020064] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 05/23/2018] [Accepted: 05/24/2018] [Indexed: 11/26/2022] Open
Abstract
Benexate, a drug used clinically as a defensive type anti-ulcer agent, has poor solubility and a bitter taste. To improve its solubility, a crystal engineering approach was proposed with the formation of novel salts using an artificial sweetener as a salt co-former. This was also expected to address the bitter taste of the drug. In this work, we report on the preparation and evaluation of the physicochemical properties of the novel salts benexate saccharinate monohydrate and benexate cyclamate whose crystal structures were determined by single-crystal X-ray structure analysis. These novel salts showed higher solubility and faster dissolution profiles that were associated with the occurrence of local layered-like structures. They also showed better moisture uptake profiles and were classified as non-hygroscopic materials. Therefore, benexate saccharinate monohydrate and benexate cyclamate expedited the development of sweet pharmaceutical salts of benexate with improved performances.
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In-situ freeze-drying - forming amorphous solids directly within capsules: An investigation of dissolution enhancement for a poorly soluble drug. Sci Rep 2017; 7:2910. [PMID: 28588206 PMCID: PMC5460206 DOI: 10.1038/s41598-017-02676-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 04/18/2017] [Indexed: 12/04/2022] Open
Abstract
Conversion into the amorphous form enhances the dissolution of poorly soluble drugs, however the barrier to market for medicines containing an amorphous drug is poor stability. The aim was to produce the amorphous form of a drug within a capsule, without thermal or mechanical stress during manufacture. To facilitate this aim, the mechanism for drug-polymer interaction was explored. Nifedipine and polyvinylpyrrolidone were dissolved in tert-butanol at different drug/polymer ratios. These solutions were dispensed into gelatin capsules and freeze-dried. Differential scanning calorimetry (DSC) & novel FT-IR analysis based on peak symmetry measurements confirmed the absence of crystallinity when polyvinylpyrrolidone exceeded 50%w/w. Capsules containing 10 mg of nifedipine were amorphous and stable for over 3 months at ≈40 °C. Evidence of hydrogen bonding between the N-H group of nifedipine and the C=O group of PVP was observed and this interaction inhibited nifedipine crystallisation. PVP’s high affinity for water and the nifedipine-polymer interaction lead to a significant dissolution rate enhancement. The freeze-dried capsule, 10%w/w nifedipine/PVP, had the highest dissolution rate constant of 0.37 ± 0.05 min−1, and the lowest time to achieve 50% dissolution or t1/2 of 1.88 ± 0.05 min. This formulation reached 80% dissolved in less than 6 min whereas the equivalent marketed liquid filled nifedipine capsule took 3 times longer to reach 80% dissolution.
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Abdelbary GA, Amin MM, Abdelmoteleb M. Novel mixed hydrotropic solubilization of Zaleplon: Formulation of oral tablets and in-vivo neuropharmacological characterization by monitoring plasma GABA level. J Drug Deliv Sci Technol 2016. [DOI: 10.1016/j.jddst.2016.03.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Nguyen TNG, Tran PHL, Tran TV, Vo TV, Truong-DinhTran T. Development of a modified – solid dispersion in an uncommon approach of melting method facilitating properties of a swellable polymer to enhance drug dissolution. Int J Pharm 2015; 484:228-34. [DOI: 10.1016/j.ijpharm.2015.02.064] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 02/20/2015] [Accepted: 02/27/2015] [Indexed: 12/18/2022]
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Ueda H, Kawai A, Hayashi T, Ida Y, Kakemi M, Tozuka Y. Process monitoring of ultrasound compaction as a small-scale heating process. Eur J Pharm Sci 2013; 49:829-35. [PMID: 23770378 DOI: 10.1016/j.ejps.2013.06.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Revised: 05/13/2013] [Accepted: 06/03/2013] [Indexed: 11/27/2022]
Abstract
Ultrasound compaction is a simple small-scale heating process. The aim of this study was to elucidate the polymer phase transition process during ultrasound compaction by process monitoring. Morphological change with heat occurs when ultrasound energy is supplied. Monitoring of the process revealed changes in both punch position and the pressure of the die in terms of the polymer's phase transition process. The optimum ultrasound energy for complete transition could be detected by a sudden increase in the pressure on the lower punch. Such optimum energy clearly depended on the polymer's glass transition temperature (Tg), suggesting that Tg is the predominant parameter in the ultrasound compaction process. Optimization of ultrasound energy based on monitoring profiles is a promising way to obtain a desirable product by thermoplastic treatment with minimal thermal degradation due to excess supply of energy.
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Affiliation(s)
- Hiroshi Ueda
- Physicochemical and Preformulation, Applied Chemistry for Drug Discovery, Innovative Drug Discovery Research Laboratories, Shionogi & Co., Ltd., 3-1-1, Futaba-cho, Toyonaka-shi, Osaka 561-0825, Japan.
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Alexander A, Tiwle R, . A, Giri TK, Tripathi DK, Jain V. An Exhaustive Review on Solubility Enhancement for Hydrophobic Compounds by Possible Applications of Novel Techniques. ACTA ACUST UNITED AC 2012. [DOI: 10.3923/tasr.2012.596.619] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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El-Lakkany N, Seif el-Din SH, Heikal L. Bioavailability and in vivo efficacy of a praziquantel–polyvinylpyrrolidone solid dispersion in Schistosoma mansoni-infected mice. Eur J Drug Metab Pharmacokinet 2012; 37:289-99. [DOI: 10.1007/s13318-012-0089-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Accepted: 03/06/2012] [Indexed: 11/27/2022]
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Changdeo JS, Vinod M, Shankar KB, Rajaram CA. Physicochemical characterization and solubility enhancement studies of allopurinol solid dispersions. BRAZ J PHARM SCI 2011. [DOI: 10.1590/s1984-82502011000300009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Allopurinol is a commonly used drug in the treatment of chronic gout or hyperuricaemia associated with treatment of diuretic conditions. One of the major problems with the drug is that it is practically insoluble in water, which results in poor bioavailability after oral administration. In the present study, solid dispersions of allopurinol were prepared by solvent evaporation, kneading method, co-precipitation method, co-grinding method and closed melting methods to increase its water solubility. Hydrophilic carriers such as polyvinylpyrrolidone, polyethylene glycol 6000 were used in the ratio of 1:1, 1:2 and 1:4 (drug to carrier ratio). The aqueous solubility of allopurinol was favored by the presence of both polymers. These new formulations were characterized in the liquid state by phase solubility studies and in the solid state by differential scanning calorimetry, powder X-ray diffraction, UV and Fourier Transform Infrared spectroscopy. Solid state characterizations indicated that allopurinol was present as an amorphous material and entrapped in polymer matrix. In contrast to the very slow dissolution rate of pure allopurinol, the dispersion of the drug in the polymers considerably enhanced the dissolution rate. Solid dispersion prepared with polyvinylpyrrolidone showed highest improvement in wettability and dissolution rate of allopurinol. Mathematical modeling of in vitro dissolution data indicated the best fitting with Korsemeyer-Peppas model and the drug release kinetics primarily as Non-Fickian diffusion. Therefore, the present study showed that polyvinylpyrrolidone and polyethylene glycol 6000 have a significant solubilizing effect on allopurinol.
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Han HK, Lee BJ, Lee HK. Enhanced dissolution and bioavailability of biochanin A via the preparation of solid dispersion: In vitro and in vivo evaluation. Int J Pharm 2011; 415:89-94. [DOI: 10.1016/j.ijpharm.2011.05.055] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Revised: 04/20/2011] [Accepted: 05/20/2011] [Indexed: 11/26/2022]
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Kim KT, Lee JY, Lee MY, Song CK, Choi JH, Kim DD. Solid Dispersions as a Drug Delivery System. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2011. [DOI: 10.4333/kps.2011.41.3.125] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Solid dispersion formulations of megestrol acetate with copovidone for enhanced dissolution and oral bioavailability. Arch Pharm Res 2011; 34:127-35. [PMID: 21468924 DOI: 10.1007/s12272-011-0115-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Revised: 10/04/2010] [Accepted: 10/09/2010] [Indexed: 10/18/2022]
Abstract
In order to enhance the dissolution profile and oral bioavailability of megestrol acetate (MA), solid dispersions of MA (MASDs) were formulated with copovidone and crystal sugar as a hydrophilic polymeric carrier and an inert core bead, respectively. Solvent evaporation method and fluidized bed coating technique were employed. MASDs were categorized as crystalline solid dispersion by the characterization of differential scanning calorimetry and X-ray diffraction. The mass-median diameters of MASDs were in a range of 1.4 to 2.6 μm. Based on drug to polymer ratio, MASD (1:1) and (1:2) were considered as optimized formulations, resulting in a smooth-surfaced homogeneously coated layer with enhanced dissolution rate. Dissolution of MASD was gradually increased up to 15 min, after which it reached a plateau. For the initial period, dissolution rates were in the decreasing order of MASD (1:2) ≥ MASD (1:1) > MASD (1:3) > MASD (1:5) > MASD (1:0.5) > MA powder. In the comparative pharmacokinetic study with Megace OS, a reference drug product, MASD (1:1) showed improved bioavailability of over 220% with 2-fold higher C(max) and 30% faster T(max). We conclude that MASD (1:1) is a good candidate for the development of oral solid dosage forms.
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Aggarwal AK, Singh S. Physicochemical characterization and dissolution study of solid dispersions of diacerein with polyethylene glycol 6000. Drug Dev Ind Pharm 2011; 37:1181-91. [DOI: 10.3109/03639045.2011.563782] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Fouad EA, El-Badry M, Neau SH, Alanazi FK, Alsarra IA. Technology evaluation: Kollicoat IR. Expert Opin Drug Deliv 2011; 8:693-703. [DOI: 10.1517/17425247.2011.566266] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Jagdale SC, Kuchekar B, Chabukswar A, Musale V, Jadhao M. Preparation and in vitro evaluation of Allopurinol-Gelucire 50/13 solid dispersions. ACTA ACUST UNITED AC 2010. [DOI: 10.5138/ijaps.2010.0976.1055.01007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Khattab IS, Nada A, Zaghloul AA. Physicochemical characterization of gliclazide-macrogol solid dispersion and tablets based on optimized dispersion. Drug Dev Ind Pharm 2010; 36:893-902. [PMID: 20196643 DOI: 10.3109/03639040903578734] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND This study investigated the physical interaction of gliclazide (GLC) with a hydrophilic carrier, that is, macrogol [polyethylene glycol (PEG)]. Different molecular weights of PEG (4000, 10,000, and 20,000) were used in different drug : carrier weight ratios (1 : 1, 1 : 2, 1 : 5, and 1 : 10). METHOD Preliminary screening was done by phase solubility studies to characterize the liquid state interaction between the drug and the carrier. Solid dispersions (SDs) of GLC and PEG in different ratios were prepared by fusion technique and by physical mixing. The solid-state interaction between the drug and the carrier was examined by performing differential scanning calorimetry and Fourier transform infrared spectroscopic studies. SD with satisfactory characteristics was selected for the formulation of tablets by wet granulation method and compared with the commercial brand for in vitro dissolution. RESULTS It was evident from phase solubility studies that the drug solubility increased linearly with increasing PEG concentrations. In vitro dissolution of GLC improved significantly in the SDs prepared by fusion method as compared with the original drug and physical mixtures. Scanning electron microscopy images showed well-defined changes in the surface topography of GLC, thus confirming the effective formation of a fused binary system. The SD tablets showed a significant improvement in the drug release profile than that of the commercial brand. CONCLUSION It was thus concluded that SD formulations of GLC can be successfully used to design a solid dosage form of the drug, which would have significant advantages over the current marketed tablets.
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Affiliation(s)
- Ibrahim S Khattab
- Department of Pharmaceutics, Faculty of Pharmacy, Kuwait University, Safat, Kuwait.
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Ito A, Watanabe T, Yada S, Hamaura T, Nakagami H, Higashi K, Moribe K, Yamamoto K. Prediction of recrystallization behavior of troglitazone/polyvinylpyrrolidone solid dispersion by solid-state NMR. Int J Pharm 2009; 383:18-23. [PMID: 19732816 DOI: 10.1016/j.ijpharm.2009.08.037] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2009] [Revised: 08/24/2009] [Accepted: 08/28/2009] [Indexed: 11/17/2022]
Abstract
The purpose of this study was to elaborate the relationship between the (13)C CP/MAS NMR spectra and the recrystallization behavior during the storage of troglitazone solid dispersions. The solid dispersions were prepared by either the solvent method or by co-grinding. The recrystallization behavior under storage conditions at 40 degrees C/94% RH was evaluated by the Kolmogorov-Johnson-Mehl-Avrami (KJMA) equation. Solid dispersions prepared by the solvent method or by prolonged grinding brought about inhibition of the nucleation and the nuclei growth at the same time. No differences in the PXRD profiles were found in the samples prepared by the co-grinding and solvent methods, however, (13)C CP/MAS NMR showed significant differences in the spectra. The correlation coefficients using partial least square regression analysis between the PXRD profiles and the apparent nuclei-growth constant or induction period to nucleation were 0.1305 or 0.6350, respectively. In contrast, those between the (13)C CP/MAS NMR spectra and the constant or the period were 0.9916 or 0.9838, respectively. The (13)C CP/MAS NMR spectra had good correlation with the recrystallization kinetic parameters evaluated by the KJMA equation. Consequently, solid-state NMR was judged to be a useful tool for the prediction of the recrystallization behavior of solid dispersions.
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Affiliation(s)
- Atsutoshi Ito
- Formulation Technology Research Laboratories, Daiichi Sankyo Co, Ltd, 1-2-58, Hiromachi, Tokyo 140-8710, Japan.
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Patel RP, Patel MM. Physicochemical Characterization and Dissolution Study of Solid Dispersions of Lovastatin with Polyethylene Glycol 4000 and Polyvinylpyrrolidone K30. Pharm Dev Technol 2008; 12:21-33. [PMID: 17484141 DOI: 10.1080/10837450601166510] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Solid dispersions in water-soluble carriers have attracted considerable interest as a means of improving the dissolution rate, and hence possibly bioavailability, of a range of hydrophobic drugs. The aim of the present study was to improve the solubility and dissolution rate of a poorly water-soluble drug, Lovastatin, by a solid dispersion technique. Solid dispersions were prepared by using polyethylene glycol 4000 (PEG 4000) and polyvinylpyrrolidone K30 (PVP K30) in different drug-to-carrier ratios. Dispersions with PEG 4000 were prepared by fusion-cooling and solvent evaporation, whereas dispersions containing PVP K30 were prepared by solvent evaporation technique. These new formulations were characterized in the liquid state by phase solubility studies and in the solid state by differential scanning calorimetry, X-ray powder diffraction, and FT-IR spectroscopy. The aqueous solubility of Lovastatin was favored by the presence of both polymers. The negative values of the Gibbs free energy and enthalpy of transfer explained the spontaneous transfer from pure water to the aqueous polymer environment. Solid-state characterization indicated Lovastatin was present as amorphous material and entrapped in polymer matrix. In contrast to the very slow dissolution rate of pure Lovastatin, the dispersion of the drug in the polymers considerably enhanced the dissolution rate. This can be attributed to improved wettability and dispersibility, as well as decrease of the crystalline and increase of the amorphous fraction of the drug. Solid dispersion prepared with PVP showed the highest improvement in wettability and dissolution rate of Lovastatin. Even physical mixture of Lovastatin prepared with both polymers also showed better dissolution profile than that of pure Lovastatin. Tablets containing solid dispersion prepared with PEG and PVP showed significant improvement in the release profile Lovastatin compared with tablets containing Lovastatin without PEG or PVP.
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Affiliation(s)
- R P Patel
- Department of Pharmaceutics, S. K. Patel College of Pharmaceutical Education and Research, Ganpat University, Ganpat Vidyanagar, Kherva, Gujarat, India.
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Furuyama N, Hasegawa S, Hamaura T, Yada S, Nakagami H, Yonemochi E, Terada K. Evaluation of solid dispersions on a molecular level by the Raman mapping technique. Int J Pharm 2008; 361:12-8. [DOI: 10.1016/j.ijpharm.2008.05.009] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2008] [Revised: 04/25/2008] [Accepted: 05/01/2008] [Indexed: 11/26/2022]
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Patel R, Patel M. Preparation, Characterization, and Dissolution Behavior of a Solid Dispersion of Simvastatin with Polyethylene Glycol 4000 and Polyvinylpyrrolidone K30. J DISPER SCI TECHNOL 2008. [DOI: 10.1080/01932690701706946] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Vasconcelos T, Sarmento B, Costa P. Solid dispersions as strategy to improve oral bioavailability of poor water soluble drugs. Drug Discov Today 2007; 12:1068-75. [PMID: 18061887 DOI: 10.1016/j.drudis.2007.09.005] [Citation(s) in RCA: 1003] [Impact Index Per Article: 59.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2007] [Revised: 09/05/2007] [Accepted: 09/14/2007] [Indexed: 11/24/2022]
Abstract
Solid dispersions are one of the most promising strategies to improve the oral bioavailability of poorly water soluble drugs. By reducing drug particle size to the absolute minimum, and hence improving drug wettability, bioavailability may be significantly improved. They are usually presented as amorphous products, mainly obtained by two major different methods, for example, melting and solvent evaporation. Recently, surfactants have been included to stabilize the formulations, thus avoiding drug recrystallization and potentiating their solubility. New manufacturing processes to obtain solid dispersions have also been developed to reduce the drawbacks of the initial process. In this review, it is intended to discuss the recent advances related on the area of solid dispersions.
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Affiliation(s)
- Teófilo Vasconcelos
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Porto, Rua Aníbal Cunha 164, 4050-047 Porto, Portugal.
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Muzzalupo R, Infante MR, Pérez L, Pinazo A, Marques EF, Antonelli ML, Strinati C, La Mesa C. Interactions between gemini surfactants and polymers: thermodynamic studies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:5963-70. [PMID: 17441737 DOI: 10.1021/la063244r] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Aqueous mixtures containing a homopolymer, poly(vinylpyrrolidone) (PVP), or a hydrophobically modified graft copolymer, HM-pullulan, (PULAU9, where 9 stands for the nominal substitution degree), and different Gemini surfactants have been investigated at 25.0 degrees C. A wide variety of experimental conditions were addressed by changing the amount of polymer and of surfactant. The Gemini surfactants were synthesized, purified, and characterized by routine methods. They differ from each other in polar head groups (two sulfonate-, two quaternary ammonium-, or two arginine-based groups), in alkyl chain length (11 or 12 carbon atoms), and in the distance between the polar head groups. The spacers consist of 2, 3, and 6 methylene units or 3 oxyethylene units. Surface activity and solution calorimetry measurements yield some physicochemical features inherent to micelle formation and polymer-surfactant interactions. The data are supported by ionic conductivity, detecting the critical thresholds and quantifying the modifications in binding associated with critical association (CAC) and micelle formation (CMC*). The Gibbs energy of transfer from the micelles to a polymer-binding site, DeltaGtrans, was evaluated from the CAC/CMC* ratios versus the amount of added polymer. A similar procedure determined the enthalpy of transfer, DeltaHtrans. DeltaGtrans decreases with added polymer, whereas DeltaHtrans becomes more negative on increasing the amount of polymer in the medium. According to the selected data presented here, cationic Geminis do not interact with PVP, while significant interactions have been observed in other surfactants. In mixtures with PULAU9, the interaction is significant for all Geminis. This effect is due to interactions between the surfactants and the hydrophobic alkyl groups on the main polymer chain. The pendent groups facing away from the polysaccharide chain act as binding sites for aggregates onto such polymers.
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Affiliation(s)
- Rita Muzzalupo
- Dipartimento di Scienze Farmaceutiche, Università della Calabria, Via P. Bucci s.n.c., Arcavacata di Rende, (Cs), I-87030 Italia
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Hasegawa S, Furuyama N, Yada S, Hamaura T, Kusai A, Yonemochi E, Terada K. Effect of physical properties of troglitazone crystal on the molecular interaction with PVP during heating. Int J Pharm 2007; 336:82-9. [PMID: 17178201 DOI: 10.1016/j.ijpharm.2006.11.041] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2006] [Revised: 10/15/2006] [Accepted: 11/18/2006] [Indexed: 11/20/2022]
Abstract
This study examined the effect of physical properties of troglitazone drug substance on the molecular interaction with polyvinylpyrrolidone K30 (PVP) during preparation by a closed melting method. Milling was conducted using impact and jet mills to change the physical properties of troglitazone, such as particle size, specific surface area, surface free energy and acidic-basic parameters. Solid dispersions (SDs) prepared from milled troglitazone, irrespective of milling method, showed almost 100% dissolution when not less than 7.5% of water was added during heating. SDs prepared from unmilled troglitazone showed almost 100% dissolution when not less than 12.8% of water was added during heating. Physical mixture (PM) containing unmilled troglitazone must be heated above at least 50 degrees C higher than the glass transition temperature (T(g)) of PVP to obtain an SD showing 100% dissolution, while PMs containing milled troglitazone could be heated above only 20 degrees C higher than the T(g) of PVP to obtain an SD showing 100% dissolution. The melting points of troglitazone in PMs containing milled troglitazone, irrespective of milling method, were lower than those in PMs containing unmilled troglitazone. These results indicated that specific interaction could occur more easily during heating between milled troglitazone and PVP during preparation by a closed melting method. In addition, Fourier transform infrared study indicated that hydrogen bonding could occur between the N-H of troglitazone and the C=O of PVP.
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Affiliation(s)
- Susumu Hasegawa
- Pharmaceutical Development Laboratories, Sankyo Co. Ltd., 1-12-1 Shinomiya, Hiratsuka, Kanagawa 254-0014, Japan.
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