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Huynh VTT, de Paiva Lacerda S, Espitalier F, Beyssac E, Ré MI. Effect of talc and vitamin E TPGS on manufacturability, stability and release properties of trilaurin-based formulations for hot-melt coating. Int J Pharm 2024; 653:123866. [PMID: 38286194 DOI: 10.1016/j.ijpharm.2024.123866] [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: 10/24/2023] [Revised: 01/25/2024] [Accepted: 01/26/2024] [Indexed: 01/31/2024]
Abstract
This study was focused on one particular case of hot-melt coating with trilaurin - a solid medium-chain monoacid triglyceride. The challenge of using trilaurin as coating agent in melting-based processes is linked to its relatively low melting profile: 15.6 °C (Tm,α), 35.1 °C ( [Formula: see text] ) and 45.7 °C (Tm,β). From a process perspective, the only possibility to generate products coated with formulations composed of trilaurin is by setting thermal operational conditions above Tm,α. From a material perspective, this processing possibility depends principally on trilaurin crystallisation which was investigated via a set of analytical techniques including turbidimetry, calorimetry, hot-melt goniometry, and polarised light microscopy. A highly soluble drug model substrate (sodium chloride crystals) was coated with three selected trilaurin-based formulations: (i) trilaurin, (ii) trilaurin plus talc, and (iii) trilaurin plus vitamin E TPGS and talc. Coated salt crystals were then analysed to investigate processing performance, coating quality, stability and release properties under digestion effect. The results show that firstly, talc addition promotes nucleation and crystal growth and, as a consequence, it facilitates the manufacture of trilaurin-based formulations. Secondly, the formulation of a solid triglyceride and a hydrophilic surfactant could potentially cause release instability, but formula (iii) was found to be stabilised by a mechanism whereby trilaurin crystallization enhanced in the presence of talc immobilised vitamin E TPGS in its crystal lattice. Thirdly, talc addition did not significantly influence trilaurin digestion which endows products with an immediate release in lipolytic conditions instead of an extended liberation in pure water. Nor did the addition of one or two additives alter the extent of trilaurin digestion under the conditions studied. These important findings relate to product manufacturability, stability, and release properties. A good understanding of material properties (e.g. crystallisation, polymorphism, digestibility) is essential for melt-processing, lipid coating stabilising and modulation of release profile of solid lipid-coated product, as demonstrated in this case study with trilaurin.
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Affiliation(s)
- Van-Trung-Tin Huynh
- RAPSODEE - Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement, Albi, France
| | - Suenia de Paiva Lacerda
- RAPSODEE - Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement, Albi, France
| | - Fabienne Espitalier
- RAPSODEE - Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement, Albi, France
| | - Eric Beyssac
- UFR de Pharmacie, Université de Clermont Auvergne, Clermont-Ferrand, France
| | - Maria-Inês Ré
- RAPSODEE - Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement, Albi, France.
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2
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Schertel S, Salar-Behzadi S, Karrer J, Laggner P, Zimmer A. Impact of polysorbate 65 on tripalmitin crystal growth and release stability of hot melt coated multiparticulate systems. Int J Pharm 2021; 607:120970. [PMID: 34363917 DOI: 10.1016/j.ijpharm.2021.120970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 07/20/2021] [Accepted: 07/30/2021] [Indexed: 11/29/2022]
Abstract
Hydrochlorothiazide (HCT) multiparticulate systems (MPS) were hot melt coated with the binary mixture of tripalmitin (PPP) and polysorbate 65 (PS 65) to gain an immediate release profile. Once, HCT MPS were produced with a constant ratio of PPP/PS 65 (90:10) at three different coating amounts (15, 25, and 60%w/w) and once the PPP/PS 65 ratio was varied on 98:2 and 80:20, by keeping the coating amount at 60%w/w. PS 65 induced the polymorphic transformation of PPP from the α-form to its most stable β-form right after the hot melt coating (HMC). A release alteration of HCT, either accelerated or decelerated, occurred after the storage under accelerated conditions. The effect of the API core on the lipid lamellar configuration, the thermal behavior of lipid coating, and the effect of PS 65 concentration on the crystal growth of PPP were investigated via X-ray diffraction and DSC. While a low amount of PS 65 was sufficient to promote crystal growth of PPP and resulted in a decelerated release of HCT from the coating, a higher PS 65 concentration favored phase separation of PPP and PS 65 and led to an accelerated release. The increase in PS 65 reinforced the molecular interaction with the lipophilic HCT, reflected in less crystal growth and decelerated release. The knowledge presented in this study supports understanding the instability of binary emulsifier-lipid coating systems, paving the way for developing robust HMC formulations.
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Affiliation(s)
- Sonja Schertel
- Institute of Pharmaceutical Sciences, Department of Pharmaceutical Technology and Biopharmacy, University of Graz, 8010 Graz, Austria; Hermes Arzneimittel GmbH, Division Hermes Pharma, 82049 Pullach, Germany
| | - Sharareh Salar-Behzadi
- Institute of Pharmaceutical Sciences, Department of Pharmaceutical Technology and Biopharmacy, University of Graz, 8010 Graz, Austria; Research Center for Pharmaceutical Engineering GmbH, 8010 Graz, Austria
| | - Julia Karrer
- Research Center for Pharmaceutical Engineering GmbH, 8010 Graz, Austria
| | - Peter Laggner
- Research Center for Pharmaceutical Engineering GmbH, 8010 Graz, Austria
| | - Andreas Zimmer
- Institute of Pharmaceutical Sciences, Department of Pharmaceutical Technology and Biopharmacy, University of Graz, 8010 Graz, Austria.
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3
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Chauhan G, Shaik AA, Kulkarni NS, Gupta V. The preparation of lipid-based drug delivery system using melt extrusion. Drug Discov Today 2020; 25:S1359-6446(20)30330-5. [PMID: 32835807 DOI: 10.1016/j.drudis.2020.07.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 05/30/2020] [Accepted: 07/28/2020] [Indexed: 01/16/2023]
Abstract
Melt extrusion of lipids is versatile with high applicability in the pharmaceutical industry. The formulations prepared can be easily customized depending on the requirements, and have the potential to open a window on personalized medicine.
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Affiliation(s)
- Gautam Chauhan
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Queens, NY 11439, USA
| | - Abdul A Shaik
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Queens, NY 11439, USA; Current address: School of Pharmacy, Texas Tech University Health Sciences Center, Amarillo, TX 79106, USA
| | - Nishant S Kulkarni
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Queens, NY 11439, USA
| | - Vivek Gupta
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Queens, NY 11439, USA.
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4
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Zhang S, Meng X, Wang Z, Fan A, Wang G, Zhao Y, Tang Y. Engineering hot-melt extruded solid dispersion for controlled release of hydrophilic drugs. Eur J Pharm Sci 2017; 100:109-115. [PMID: 28087352 DOI: 10.1016/j.ejps.2017.01.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 09/27/2016] [Accepted: 01/09/2017] [Indexed: 01/20/2023]
Abstract
It is often challenging to precisely manipulate the release behavior of hydrophilic drugs that is believed to be crucial for a satisfactory therapeutic outcome. The aim of this work was to regulate the dissolution of hydrophilic drug from hot-melt extruded solid dispersion via rational screening of the pore-forming agents. Venlafaxine hydrochloride and Compritol® 888 ATO was selected as the model drug and carrier excipient, respectively. Hydrophilic polyethylene glycol (PEG 6000) and polyvinylpyrolidone (PVP K30) were chosen as the transient pore-forming agents. The X-ray diffraction and thermal analysis showed that both drug and carrier existed in the crystalline form. Both types of polymers could generate pores upon dissolution test and the drug release rate was proportionally correlated to the pore-forming agent content. The mathematical modelling showed that the Ritger-Peppas model gave the best fit to the release curves, which demonstrates a diffusion-dominant release mechanism. The scanning electron microscopy and mercury intrusion porosimetry analysis proved that PVP K30 could generate large pores with low porosity, but PEG 6000 produced smaller pores with relatively high porosity. The in vivo pharmacokinetics study in rat revealed that solid dispersions containing either PEG 6000 or PVP K30 (both at 2.5%, w/w) exhibited an elevated bioavailability compared to the commercial product, Effexor® XR. The current work implied that rational screening of transient pore-forming polymer in solid dispersion could be a robust approach for controlling hydrophilic drug release.
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Affiliation(s)
- Shuli Zhang
- School of Pharmaceutical Science & Technology, Tianjin Key Laboratory for Modern Drug Delivery & High Efficiency, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China
| | - Xuan Meng
- School of Pharmaceutical Science & Technology, Tianjin Key Laboratory for Modern Drug Delivery & High Efficiency, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China
| | - Zheng Wang
- School of Pharmaceutical Science & Technology, Tianjin Key Laboratory for Modern Drug Delivery & High Efficiency, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China
| | - Aiping Fan
- School of Pharmaceutical Science & Technology, Tianjin Key Laboratory for Modern Drug Delivery & High Efficiency, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China
| | - Guocheng Wang
- Chem-Pharm R&D Institute, Tasly Holding Group Co. Ltd., Tianjin 300402, China
| | - Yanjun Zhao
- School of Pharmaceutical Science & Technology, Tianjin Key Laboratory for Modern Drug Delivery & High Efficiency, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China.
| | - Yu Tang
- Chem-Pharm R&D Institute, Tasly Holding Group Co. Ltd., Tianjin 300402, China.
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5
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Fatty acids for controlled release applications: A comparison between prilling and solid lipid extrusion as manufacturing techniques. Eur J Pharm Biopharm 2015; 97:173-84. [DOI: 10.1016/j.ejpb.2015.09.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Revised: 07/30/2015] [Accepted: 09/21/2015] [Indexed: 11/22/2022]
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6
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Becker K, Salar-Behzadi S, Zimmer A. Solvent-free melting techniques for the preparation of lipid-based solid oral formulations. Pharm Res 2015; 32:1519-45. [PMID: 25788447 PMCID: PMC4381087 DOI: 10.1007/s11095-015-1661-y] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Accepted: 02/19/2015] [Indexed: 01/08/2023]
Abstract
Lipid excipients are applied for numerous purposes such as taste masking, controlled release, improvement of swallowability and moisture protection. Several melting techniques have evolved in the last decades. Common examples are melt coating, melt granulation and melt extrusion. The required equipment ranges from ordinary glass beakers for lab scale up to large machines such as fluid bed coaters, spray dryers or extruders. This allows for upscaling to pilot or production scale. Solvent free melt processing provides a cost-effective, time-saving and eco-friendly method for the food and pharmaceutical industries. This review intends to give a critical overview of the published literature on experiences, formulations and challenges and to show possibilities for future developments in this promising field. Moreover, it should serve as a guide for selecting the best excipients and manufacturing techniques for the development of a product with specific properties using solvent free melt processing.
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Affiliation(s)
- Karin Becker
- Institute of Pharmaceutical Sciences, Department of Pharmaceutical Technology, Karl-Franzens-University Graz, Member of BioTechMed, Universitätplatz 1, 8010 Graz, Austria
| | | | - Andreas Zimmer
- Institute of Pharmaceutical Sciences, Department of Pharmaceutical Technology, Karl-Franzens-University Graz, Member of BioTechMed, Universitätplatz 1, 8010 Graz, Austria
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7
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Paus R, Prudic A, Ji Y. Influence of excipients on solubility and dissolution of pharmaceuticals. Int J Pharm 2015; 485:277-87. [PMID: 25749073 DOI: 10.1016/j.ijpharm.2015.03.004] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 02/27/2015] [Accepted: 03/02/2015] [Indexed: 11/15/2022]
Abstract
In this work, solubilities and dissolution profiles of the active pharmaceutical ingredients (APIs) indomethacin and naproxen were measured in water in the presence of one excipient out of polyethylene glycol (PEG) 2000, 6000 and 12000, polyvinylpyrrolidone (PVP) K 25 and mannitol. It was found that the solubility of indomethacin and naproxen was increased with an addition of the selected excipients, which was also predicted by the perturbed-chain statistical associating fluid theory (PC-SAFT). The two-step chemical-potential-gradient model was applied to investigate the dissolution mechanism of indomethacin and naproxen in water in the presence of the excipient. It was found that the dissolution mechanisms of indomethacin and naproxen were changed by the presence of excipients. Although the solubility of the API was increased by the addition of excipients, the dissolution rate of the API was decreased in some cases. This was mainly due to the combination of the molecular interactions between the API and the polymer with the influence of the excipients on the kinetic part (rate constant of the surface reaction or diffusion of the API or both) of API dissolution as function of PEG molar mass as well as of the API type. Based upon the determined rate constants, the dissolution profiles were modeled with a high accuracy compared with the experimental data.
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Affiliation(s)
- Raphael Paus
- TU Dortmund, Department of Biochemical and Chemical Engineering, Laboratory of Thermodynamics, Emil-Figge Str. 70, D-44227 Dortmund, Germany
| | - Anke Prudic
- TU Dortmund, Department of Biochemical and Chemical Engineering, Laboratory of Thermodynamics, Emil-Figge Str. 70, D-44227 Dortmund, Germany
| | - Yuanhui Ji
- TU Dortmund, Department of Biochemical and Chemical Engineering, Laboratory of Thermodynamics, Emil-Figge Str. 70, D-44227 Dortmund, Germany.
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Thermoplastic polyurethanes for the manufacturing of highly dosed oral sustained release matrices via hot melt extrusion and injection molding. Eur J Pharm Biopharm 2015; 90:44-52. [DOI: 10.1016/j.ejpb.2014.11.003] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Revised: 11/04/2014] [Accepted: 11/07/2014] [Indexed: 11/24/2022]
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9
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Prilling of fatty acids as a continuous process for the development of controlled release multiparticulate dosage forms. Eur J Pharm Biopharm 2013; 85:587-96. [DOI: 10.1016/j.ejpb.2013.02.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Revised: 12/13/2012] [Accepted: 02/10/2013] [Indexed: 11/20/2022]
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10
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11
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Yan X, He H, Meng J, Zhang C, Hong M, Tang X. Preparation of lipid aspirin sustained-release pellets by solvent-free extrusion/spheronization and an investigation of their stability. Drug Dev Ind Pharm 2012; 38:1221-9. [PMID: 22713120 DOI: 10.3109/03639045.2011.645829] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
A novel solvent-free extrusion/spheronization technique was investigated for preparing stable aspirin sustained-release pellets. Lipids as binders and the matrix in this technique were extruded below their melting points, and spheronized in a thermomechanical process. Four types of lipids (adeps solidus, Compritol(®) 888 ATO, Precirol(®) ATO5 and Compritol(®) HD5 ATO) and their admixture in different ratios were used to obtain spherical and extended-release pellets. Pellets containing 80% aspirin, 15% adeps solidus and 5% Compritol(®) 888 ATO had the best spherical geometry and met the dissolution requirements of aspirin extended-release tablets in USP 31. Storage stability studies showed that the content of free salicylic acid increased sharply in the traditional pellets produced by wet extrusion/spheronization, from 1.91 to 7.84%, whereas there was little increase in the lipid pellets (from 0.48 to 1.08%). The dissolution rate from the optimal pellets (F11) stored at 26°C did not change, but became faster at 40°C/RH75% after 5 months. Powder X-ray diffraction, scanning electron microscopy (SEM) and differential scanning calorimetry were used to investigate the physical properties of the pellets during stability testing. The increase in the rate of drug release from aged pellets (40°C/RH75%) may result from the partially melted adeps solidus observed in SEM photographs. This study suggests that it is possible to prepare sustained-release pellets by solvent-free extrusion/spheronization using an appropriate mixture of lipids with high stability. In particular, this novel technique is excellent for hygroscopic drugs.
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Affiliation(s)
- Xiaonan Yan
- College of Pharmacy, Shenyang Pharmaceutical University, Shenyang, PR China
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12
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Vaassen J, Bartscher K, Breitkreutz J. Taste masked lipid pellets with enhanced release of hydrophobic active ingredient. Int J Pharm 2012; 429:99-103. [DOI: 10.1016/j.ijpharm.2012.03.013] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Revised: 03/06/2012] [Accepted: 03/07/2012] [Indexed: 11/26/2022]
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13
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Güres S, Siepmann F, Siepmann J, Kleinebudde P. Drug release from extruded solid lipid matrices: Theoretical predictions and independent experiments. Eur J Pharm Biopharm 2012; 80:122-9. [DOI: 10.1016/j.ejpb.2011.10.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Revised: 09/28/2011] [Accepted: 10/03/2011] [Indexed: 11/28/2022]
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14
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Liu KL, Widjaja E, Huang Y, Ng XW, Loo SCJ, Boey FYC, Venkatraman SS. A New Insight for an Old System: Protein-PEG Colocalization in Relation to Protein Release from PCL/PEG Blends. Mol Pharm 2011; 8:2173-82. [DOI: 10.1021/mp200513b] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Kerh Lin Liu
- School of Materials Science and Engineering, Nanyang Technological University, Block N4.1-02-06,
Nanyang Avenue, Singapore 639798
| | - Effendi Widjaja
- Institute of Chemical and Engineering Sciences, 1 Pesek Road, Jurong Island, Singapore 627833
| | - Yingying Huang
- School of Materials Science and Engineering, Nanyang Technological University, Block N4.1-02-06,
Nanyang Avenue, Singapore 639798
| | - Xu Wen Ng
- School of Materials Science and Engineering, Nanyang Technological University, Block N4.1-02-06,
Nanyang Avenue, Singapore 639798
| | - Say Chye Joachim Loo
- School of Materials Science and Engineering, Nanyang Technological University, Block N4.1-02-06,
Nanyang Avenue, Singapore 639798
| | - Freddy Yin Chiang Boey
- School of Materials Science and Engineering, Nanyang Technological University, Block N4.1-02-06,
Nanyang Avenue, Singapore 639798
| | - Subbu S. Venkatraman
- School of Materials Science and Engineering, Nanyang Technological University, Block N4.1-02-06,
Nanyang Avenue, Singapore 639798
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15
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Haaser M, Windbergs M, McGoverin CM, Kleinebudde P, Rades T, Gordon KC, Strachan CJ. Analysis of matrix dosage forms during dissolution testing using raman microscopy. J Pharm Sci 2011; 100:4452-9. [DOI: 10.1002/jps.22609] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Revised: 04/06/2011] [Accepted: 04/19/2011] [Indexed: 11/08/2022]
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16
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Hasa D, Perissutti B, Grassi M, Zacchigna M, Pagotto M, Lenaz D, Kleinebudde P, Voinovich D. Melt extruded helical waxy matrices as a new sustained drug delivery system. Eur J Pharm Biopharm 2011; 79:592-600. [PMID: 21827851 DOI: 10.1016/j.ejpb.2011.07.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Revised: 07/21/2011] [Accepted: 07/25/2011] [Indexed: 11/15/2022]
Abstract
The aim of this research was to prepare helical and cylindrical extrudates by melt extrusion and to evaluate their potential as sustained release dosage form. The systems contained theophylline as water-soluble model drug and microcrystalline wax as thermoplastic binder. The temperature suitable to ensure a successful extrusion process of formulations containing the wax in three different percentages was found to be below the melting point of the excipient. After the production of the extrudates in three different helical shapes (having 2, 3 and 4 blades) and a classical cylindrical shape, the systems were studied by means of X-ray powder diffraction and differential scanning calorimetry to check possible variations of the solid state of the drug during the thermal process. The morphology and chemical composition of the surface of the extrudates were examined by Scanning Electron Microscopy/Energy Dispersive X-ray Microanalysis to evaluate the presence of the drug on the surface of the extrudates and to monitor changes on the aspect of the waxy matrix during dissolution. Then, the different systems were analysed from the in vitro dissolution point of view to study the influence of the shape and of the composition on the drug release. An in vivo pilot study on the best performing system (helix with 3 blades) was carried out on five healthy volunteers and monitoring the intestinal transit by X-ray images. The resulting plasma profiles were analysed by means of a suitable pharmacokinetic analysis. Finally, an ad hoc mathematical model was developed to perform an accurate description of the in vitro release and in vivo performance of the 3-blades helical system.
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Affiliation(s)
- Dritan Hasa
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, Trieste, Italy
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17
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Gao Y, Zhu CL, Zhang XX, Gan L, Gan Y. Lipid–polymer composite microspheres for colon-specific drug delivery prepared using an ultrasonic spray freeze-drying technique. J Microencapsul 2011; 28:549-56. [DOI: 10.3109/02652048.2011.599442] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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18
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Güres S, Kleinebudde P. Dissolution from solid lipid extrudates containing release modifiers. Int J Pharm 2011; 412:77-84. [DOI: 10.1016/j.ijpharm.2011.04.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Revised: 04/04/2011] [Accepted: 04/06/2011] [Indexed: 10/18/2022]
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19
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Kleinebudde P. Pharmazeutisches Produktdesign: Gezielte Freisetzung von Wirkstoffen durch unterschiedliche Extrusionstechniken. CHEM-ING-TECH 2011. [DOI: 10.1002/cite.201000162] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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20
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Witzleb R, Kanikanti VR, Hamann HJ, Kleinebudde P. Solid lipid extrusion with small die diameters – Electrostatic charging, taste masking and continuous production. Eur J Pharm Biopharm 2011; 77:170-7. [DOI: 10.1016/j.ejpb.2010.10.002] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2010] [Revised: 10/04/2010] [Accepted: 10/06/2010] [Indexed: 11/27/2022]
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21
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Windbergs M, Haaser M, McGoverin CM, Gordon KC, Kleinebudde P, Strachan CJ. Investigating the relationship between drug distribution in solid lipid matrices and dissolution behaviour using raman spectroscopy and mapping**Maike Windbergs and Miriam Haaser contributed equally to this work. J Pharm Sci 2010; 99:1464-75. [DOI: 10.1002/jps.21894] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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22
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Windbergs M, Gueres S, Strachan CJ, Kleinebudde P. Two-step solid lipid extrusion as a process to modify dissolution behavior. AAPS PharmSciTech 2010; 11:2-8. [PMID: 20309654 DOI: 10.1208/s12249-010-9395-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2009] [Accepted: 02/16/2010] [Indexed: 11/30/2022] Open
Abstract
Extrudates based on varying ratios of the triglyceride tripalmitin and the hydrophilic polymer polyethylene glycol as matrix formers were produced as oral dosage forms with controlled release characteristics. The extrudates were processed below the melting points of the excipients and contained the hydrophobic model drug chloramphenicol. The influence of the ratio of the matrix formers on drug dissolution was investigated, with an increase in the water-soluble polymer content increasing the drug release rate. In addition, the effect of varying the extrusion process on the extrudate structure and drug dissolution was investigated. Two-step extrusion was performed, which comprised an initial extrusion step of drug and one matrix component followed by milling these extrudates and a second extrusion step for the milled extrudates mixed with the second matrix component. Initial extrusion with polyethylene glycol led to increased dissolution rates, while initial extrusion with tripalmitin led to decreased dissolution rates compared to the dissolution characteristics of extrudates containing the same composition produced by one-step extrusion. Thus, two-step solid lipid extrusion can successfully be used as a process to modify the dissolution behavior of extrudates.
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23
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Windbergs M, Strachan CJ, Kleinebudde P. Influence of structural variations on drug release from lipid/polyethylene glycol matrices. Eur J Pharm Sci 2009; 37:555-62. [DOI: 10.1016/j.ejps.2009.04.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2009] [Revised: 04/14/2009] [Accepted: 04/17/2009] [Indexed: 11/26/2022]
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