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Abdelhamid M, Koutsamanis I, Corzo C, Maisriemler M, Ocampo AB, Slama E, Alva C, Lochmann D, Reyer S, Freichel T, Salar-Behzadi S, Spoerk M. Filament-based 3D-printing of placebo dosage forms using brittle lipid-based excipients. Int J Pharm 2022; 624:122013. [PMID: 35839981 DOI: 10.1016/j.ijpharm.2022.122013] [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: 04/14/2022] [Revised: 07/04/2022] [Accepted: 07/08/2022] [Indexed: 11/28/2022]
Abstract
In order to expand the limited portfolio of available polymer-based excipients for fabricating three-dimensional (3D) printed pharmaceutical products, Lipid-based excipients (LBEs) have yet to be thoroughly investigated. The technical obstacle of LBEs application is, however their crystalline nature that renders them very brittle and challenging for processing via 3D-printing. In this work, we evaluated the functionality of LBEs for filament-based 3D-printing of oral dosage forms. Polyglycerol partial ester of palmitic acid and polyethylene glycols monostearate were selected as LBEs, based on their chemical structure, possessing polar groups for providing hydrogen-bonding sites. A fundamental understanding of structure-function relationship was built to screen the critical material attributes relevant for both extrusion and 3D-printing processes. The thermal behavior of lipids, including the degree of their supercooling, was the critical attribute for their processing. The extrudability of materials was improved through different feeding approaches, including the common powder feeding and a devised liquid feeding setup. Liquid feeding was found to be more efficient, allowing the production of filaments with high flexibility and improved printability. Filaments with superior performance were produced using polyglycerol ester of palmitic acid. In-house designed modifications of the utilized 3D-printer were essential for a flawless processing of the filaments.
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Affiliation(s)
- Moaaz Abdelhamid
- Research Center Pharmaceutical Engineering GmbH, Graz, Austria; Institute for Process and Particle Engineering, Graz University of Technology, Graz, Austria
| | | | - Carolina Corzo
- Research Center Pharmaceutical Engineering GmbH, Graz, Austria
| | | | | | - Eyke Slama
- Research Center Pharmaceutical Engineering GmbH, Graz, Austria
| | - Carolina Alva
- Research Center Pharmaceutical Engineering GmbH, Graz, Austria
| | | | | | | | - Sharareh Salar-Behzadi
- Research Center Pharmaceutical Engineering GmbH, Graz, Austria; University of Graz, Institute of Pharmaceutical Sciences, Department of Pharmaceutical Technology and Biopharmacy, Graz, Austria.
| | - Martin Spoerk
- Research Center Pharmaceutical Engineering GmbH, Graz, Austria
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Tang TO, Holmes S, Boyd BJ, Simon GP. Extrusion and 3D printing of novel lipid-polymer blends for oral drug applications. BIOMATERIALS ADVANCES 2022; 137:212818. [PMID: 35929236 DOI: 10.1016/j.bioadv.2022.212818] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 04/06/2022] [Accepted: 04/18/2022] [Indexed: 11/24/2022]
Abstract
Lipids are interesting biological materials that can offer a number of pharmaceutical benefits when used as carriers for drug delivery. However, 3D printing of lipids alone by fused deposition processing techniques is very difficult as they have very poor mechanical properties that cause their filaments to fail when they are loaded into a fused deposition 3D printer. If this problem could be overcome, then lipids could be 3D printed into bespoke tablets and assist progress towards such personalised medicines. This work aims to improve the mechanical properties of lipid filaments by developing novel lipid-EVA (ethylene vinyl acetate) blends suitable for 3D printing. Different types of lipids in varying proportions were melt blended with EVA and extruded using a micro compounder. The ultimate printability of the materials was tested by feeding the filaments into a material extrusion 3D printer. Flexural testing of the extruded blends demonstrates that a good balance between the strength and flexibility is required for a material to be printable and it was found that a filament has to have a modulus/strength ratio between 8 and 25 in order to be printable. SEM analysis of the fracture surface shows a network structure within the lipid matrix that could be playing a role in the improved properties of the best performing blends. DSC thermograms show a shift in thermal transitions, suggesting some level of miscibility of the components that could have contributed to a more robust structure. The TGA results show an onset of degradation of the blends greater than 200 °C, indicating that the materials can readily withstand the extrusion and printing temperatures. This study demonstrates the successful extrusion and 3D printing of novel EVA-lipid blends with lipid contents of up to 90%.
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Affiliation(s)
- Tiffany O Tang
- Department of Materials Science and Engineering, Faculty of Engineering, Monash University, Clayton, VIC 3800, Australia; Manufacturing, Commonwealth Scientific and Industrial Research Organisation, Research Way, Clayton, VIC 3168, Australia.
| | - Susan Holmes
- Manufacturing, Commonwealth Scientific and Industrial Research Organisation, Research Way, Clayton, VIC 3168, Australia.
| | - Ben J Boyd
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Pde, Parkville, 3052 Victoria, Australia.
| | - George P Simon
- Department of Materials Science and Engineering, Faculty of Engineering, Monash University, Clayton, VIC 3800, Australia.
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Vollrath M, Engert J, Winter G. New insights into process understanding of solid lipid extrusion (SLE) of extruded lipid implants for sustained protein delivery. Eur J Pharm Biopharm 2018; 130:11-21. [PMID: 29913270 DOI: 10.1016/j.ejpb.2018.06.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2017] [Revised: 05/23/2018] [Accepted: 06/13/2018] [Indexed: 11/24/2022]
Abstract
The aim of this work is a better understanding of solid lipid extrusion (SLE) for protein depot production using a lab-scale twin-screw (tsc)-extruder. In this context, little is known about the relationship of process parameters such as extrusion temperature, screw speed, or formulation on implant characteristics. It is difficult to attribute release characteristics to only one parameter, since the release will always be influenced by a combination of parameters. In this study, we describe the use of an online pressure measurement tool which allows to characterize pressure profiles during an extrusion run. We systematically investigated the impact of various process parameters on implant properties as well as release patterns using a monoclonal antibody (mAb). Solid lipid implants (SLIs) were produced by tsc-extrusion using the low melting triglyceride H12 and the high melting triglyceride Dynasan® D118. A mAb available in a freeze-dried matrix containing hydroxypropyl-β-cyclodextrine (HP-β-CD) was used as incorporated active pharmaceutical ingredient. Extrusion temperature (33-37 °C), screw speed (40-80 rpm) and the lipid composition (30-70% of each triglyceride) were modified. Additionally, freshly extruded SLIs were ground and extruded again as a preparation technique to optimize properties of SLIs. Using the pressure monitoring tool, four characteristic phases were defined for an extrusion run. We found that both, sufficient pressure and adequately molten material, is needed to form a suitable implant. Using the double extrusion technique, release rates could substantially be slowed down without changing formulation.
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Affiliation(s)
- Moritz Vollrath
- Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Ludwig-Maximilians-University, Butenandtstrasse 5-13, D-81377 Munich, Germany.
| | - Julia Engert
- Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Ludwig-Maximilians-University, Butenandtstrasse 5-13, D-81377 Munich, Germany
| | - Gerhard Winter
- Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Ludwig-Maximilians-University, Butenandtstrasse 5-13, D-81377 Munich, Germany
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Jensen MB, Slots C, Ditzel N, Albrektsen O, Borg S, Thygesen T, Kassem M, Andersen MØ. Composites of fatty acids and ceramic powders are versatile biomaterials for personalized implants and controlled release of pharmaceuticals. ACTA ACUST UNITED AC 2018. [DOI: 10.1016/j.bprint.2018.e00027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Vollrath M, Engert J, Winter G. Long-term release and stability of pharmaceutical proteins delivered from solid lipid implants. Eur J Pharm Biopharm 2017; 117:244-255. [PMID: 28442372 DOI: 10.1016/j.ejpb.2017.04.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 03/19/2017] [Accepted: 04/13/2017] [Indexed: 01/13/2023]
Abstract
Solid lipid implants (SLIs) prepared by twin-screw (tsc) extrusion represent a promising technology platform for the sustained release of pharmaceutical proteins. In this work, we report on two aspects, long-term release and stability of released protein. First, SLIs were produced by tsc-extrusion containing the low melting triglyceride H12 and the high melting triglyceride Dynasan D118. Two different proteins available in a freeze-dried matrix containing hydroxypropyl-β-cyclodextrine (HP-β-CD) were incorporated into the lipid matrix: a monoclonal antibody (mAb) from the IgG1 class and the fab-fragment Ranibizumab (Lucentis®). SLIs, composed of 10% protein lyophilizate and both triglycerides, were extruded at 35°C and 40rpm. Sustained release of both proteins was observed in a sustained manner for approximately 120days. Protein load per implant was increased by three different approaches resulting in a protein load of 3.00mg per implant without affecting the release profiles. The incubation medium containing the released protein was collected, concentrated and analyzed including liquid chromatography (SE-HPLC, IEX, HIC), electrophoresis (SDS-PAGE, on-chip gel electrophoresis) and FT-IR spectroscopy. The mAb showed a monomer loss of up to 7% (SE-HPLC) and IEX analysis revealed the formation of 16% acidic subspecies after 18weeks. FT-IR spectra of mAb indicated the formation of random coil structures towards the end of the release study. Ranibizumab was mainly released in its monomeric form (>95%), and approximately 5% hydrophobic subspecies were formed after 18weeks of release. FT-IR analysis revealed no changes in secondary structure. The release and stability profiles of both proteins underline the potential of SLIs as a delivery system. SLIs provide a promising platform for applications where really long-term release is needed, for example for intraocular delivery of anti-vascular endothelial growth factor (VEGF) drugs for age related macular degeneration (AMD).
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Affiliation(s)
- Moritz Vollrath
- Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Ludwig-Maximilians-University, Butenandtstrasse 5-13, Munich D-81377, Germany
| | - Julia Engert
- Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Ludwig-Maximilians-University, Butenandtstrasse 5-13, Munich D-81377, Germany
| | - Gerhard Winter
- Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Ludwig-Maximilians-University, Butenandtstrasse 5-13, Munich D-81377, Germany.
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Aleksovski A, Van Bockstal PJ, Roškar R, Sovány T, Regdon G, De Beer T, Vervaet C, Dreu R. Comparison of metoprolol tartrate multiple-unit lipid matrix systems produced by different technologies. Eur J Pharm Sci 2016; 88:233-45. [PMID: 26980237 DOI: 10.1016/j.ejps.2016.03.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 02/14/2016] [Accepted: 03/10/2016] [Indexed: 10/22/2022]
Abstract
The aim of this study was to develop, evaluate and compare extended release mini-matrices based on metoprolol tartrate (MPT) and either glyceryl behenate (GB) or glyceryl palmitostearate (GPS). Mini-matrices were produced by three different techniques: hot melt extrusion, compression of melt granulates and prilling. Hot-melt extrusion and compression of granules obtained from melted material proved to be reliable, robust and reproducible techniques with aim of obtaining extended release matrices. Prilling tended to be susceptible to increased melt viscosity. Direct compression was not applicable for mini-matrix production due to poor powder flow. In general MPT release from all matrices was affected by its loading and the size of the units/particles. Processing of GB-MPT mixtures by different techniques did not lead to different drug release rates and patterns, while in case of GPS differently obtained matrices provided diverse MPT release outcomes. Matrices based on GB tended to have higher porosity compared to ones composed of GPS and thus most of the GB-based formulations showed faster drug delivery. FT-IR analysis revealed no interactions between primary components used for matrix production and Raman mapping outlined uniform MPT distribution throughout the units. DSC and X-ray studies revealed significant changes in the crystallinity of glycerides after storage under room conditions (GPS samples) and at increased temperature (GB and GPS samples), which was correlated to the changes seen in drug release rate and pattern after storage. Media composition in general tended to insignificantly affect GB matrices, while in case of GPS matrices increasing the pH and presence of biorelevant compounds induced faster drug release.
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Affiliation(s)
- Aleksandar Aleksovski
- Laboratory of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium; Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Ljubljana, Aškerčeva 7, 1000 Ljubljana, Slovenia
| | - Pieter-Jan Van Bockstal
- Laboratory of Pharmaceutical Process Analytical Technology, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
| | - Robert Roškar
- Department of Biopharmacy and Pharmacokinetics, Faculty of Pharmacy, University of Ljubljana, Aškerčeva 7, 1000 Ljubljana, Slovenia
| | - Tamás Sovány
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Szeged, Eötvös 6, 6720 Szeged, Hungary
| | - Géza Regdon
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Szeged, Eötvös 6, 6720 Szeged, Hungary
| | - Thomas De Beer
- Laboratory of Pharmaceutical Process Analytical Technology, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
| | - Chris Vervaet
- Laboratory of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
| | - Rok Dreu
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Ljubljana, Aškerčeva 7, 1000 Ljubljana, Slovenia.
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Petrovick GF, Breitkreutz J, Pein-Hackelbusch M. Taste-masking properties of solid lipid based micropellets obtained by cold extrusion-spheronization. Int J Pharm 2016; 506:361-70. [DOI: 10.1016/j.ijpharm.2016.04.058] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 04/20/2016] [Accepted: 04/21/2016] [Indexed: 11/16/2022]
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Alcohol dose dumping: The influence of ethanol on hot-melt extruded pellets comprising solid lipids. Eur J Pharm Biopharm 2015; 92:83-95. [DOI: 10.1016/j.ejpb.2015.02.022] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 02/18/2015] [Accepted: 02/22/2015] [Indexed: 11/20/2022]
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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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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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Liu T, Dan N, Dan W. The effect of crosslinking agent on sustained release of bFGF–collagen microspheres. RSC Adv 2015. [DOI: 10.1039/c5ra00991j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Initial burst release and loss of bioactivity of drugs are the shortcomings of drug delivery systems (DDSs) used for in vivo treatment.
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Affiliation(s)
- Ting Liu
- Department of Biomass Chemistry and Engineering
- Sichuan University
- Chengdu
- China
- Research Center of Biomedical Engineering
| | - Nianhua Dan
- Department of Biomass Chemistry and Engineering
- Sichuan University
- Chengdu
- China
- Research Center of Biomedical Engineering
| | - Weihua Dan
- Department of Biomass Chemistry and Engineering
- Sichuan University
- Chengdu
- China
- Research Center of Biomedical Engineering
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El-Refaie WM, El-Massik MA, Abdallah OY, Khalafallah NM. Formulation and evaluation of taste-masked paracetamol-lipid sachets and chewable tablets. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2014. [DOI: 10.1007/s40005-014-0137-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
Melt extrusion (ME) over recent years has found widespread application as a viable drug delivery option in the drug development process. ME applications include taste masking, solid-state stability enhancement, sustained drug release and solubility enhancement. While ME can result in amorphous or crystalline solid dispersions depending upon several factors, solubility enhancement applications are centered around generating amorphous dispersions, primarily because of the free energy benefits they offer. In line with the purview of the current issue, this review assesses the utility of ME as a means of enhancing solubility of poorly soluble drugs/chemicals. The review describes major processing aspects of ME technology, definition and understanding of the amorphous state, manufacturability, analytical characterization and biopharmaceutical performance testing to better understand the strength and weakness of this formulation strategy for poorly soluble drugs. In addition, this paper highlights the potential advantages of employing a fusion of techniques, including pharmaceutical co-crystals and spray drying/solvent evaporation, facilitating the design of formulations of API exhibiting specific physico-chemical characteristics. Finally, the review presents some successful case studies of commercialized ME based products.
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Affiliation(s)
- Sejal Shah
- Department of Pharmaceutics, Pii Center for Pharmaceutical Technology, School of Pharmacy, The University of Mississippi, University, MS 38677-1848, United States
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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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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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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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18
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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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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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Taylor M, Elhissi AMA. Predicting the physical properties of tablets from ATR-FTIR spectra using partial least squares regression. Pharm Dev Technol 2010; 16:110-7. [PMID: 20100067 DOI: 10.3109/10837450903499374] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
CONTEXT The formulation of a new tablet is a time-consuming activity involving the preparation and testing of many different formulations with the aim of identifying one with the desired properties. In complex formulations it may not be clear which excipient is responsible for eliciting a particular property. OBJECTIVE To investigate partial least squares (PLS) regression analysis of ATR-FTIR spectra of tablets as a predictive and investigative tool in the formulation of novel tablet formulations. MATERIALS Magnesium stearate, lactose, acetylsalicylic acid and Ac-Di-Sol. RESULTS AND DISCUSSION ATR-FTIR spectra of a simple aspirin tablet formulation with varying amounts of the lubricant magnesium stearate were obtained. PLS models were built using the spectral data as the multivariate variable and various physical properties of the tablets as the univariate variables. PLS models that allowed good predications to be made for samples not included in the training set were obtained for tablet hardness and disintegration time. It was clear from PLS model regression coefficients that magnesium stearate was responsible for the variation in the tablets' physical properties. CONCLUSION PLS regression in combination with ATR-FTIR spectroscopy has been shown to be a useful approach for the prediction of the physical properties of tablets.
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Affiliation(s)
- Michael Taylor
- School of Pharmacy and Pharmaceutical Sciences, University of Central Lancashire, Preston, Lancashire, UK.
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Windbergs M, Jurna M, Offerhaus HL, Herek JL, Kleinebudde P, Strachan CJ. Chemical Imaging of Oral Solid Dosage Forms and Changes upon Dissolution Using Coherent Anti-Stokes Raman Scattering Microscopy. Anal Chem 2009; 81:2085-91. [DOI: 10.1021/ac8020856] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Maike Windbergs
- Institute of Pharmaceutics and Biopharmaceutics, Heinrich-Heine University, Düsseldorf, Germany, Centre for Drug Research, University of Helsinki, Finland, Optical Sciences Group, MESA+Institute for Nanotechnology, University of Twente, The Netherlands, and School of Pharmacy, University of Otago, New Zealand
| | - Martin Jurna
- Institute of Pharmaceutics and Biopharmaceutics, Heinrich-Heine University, Düsseldorf, Germany, Centre for Drug Research, University of Helsinki, Finland, Optical Sciences Group, MESA+Institute for Nanotechnology, University of Twente, The Netherlands, and School of Pharmacy, University of Otago, New Zealand
| | - Herman L. Offerhaus
- Institute of Pharmaceutics and Biopharmaceutics, Heinrich-Heine University, Düsseldorf, Germany, Centre for Drug Research, University of Helsinki, Finland, Optical Sciences Group, MESA+Institute for Nanotechnology, University of Twente, The Netherlands, and School of Pharmacy, University of Otago, New Zealand
| | - Jennifer L. Herek
- Institute of Pharmaceutics and Biopharmaceutics, Heinrich-Heine University, Düsseldorf, Germany, Centre for Drug Research, University of Helsinki, Finland, Optical Sciences Group, MESA+Institute for Nanotechnology, University of Twente, The Netherlands, and School of Pharmacy, University of Otago, New Zealand
| | - Peter Kleinebudde
- Institute of Pharmaceutics and Biopharmaceutics, Heinrich-Heine University, Düsseldorf, Germany, Centre for Drug Research, University of Helsinki, Finland, Optical Sciences Group, MESA+Institute for Nanotechnology, University of Twente, The Netherlands, and School of Pharmacy, University of Otago, New Zealand
| | - Clare J. Strachan
- Institute of Pharmaceutics and Biopharmaceutics, Heinrich-Heine University, Düsseldorf, Germany, Centre for Drug Research, University of Helsinki, Finland, Optical Sciences Group, MESA+Institute for Nanotechnology, University of Twente, The Netherlands, and School of Pharmacy, University of Otago, New Zealand
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