1
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Jolliffe HG, Prostredny M, Mendez Torrecillas C, Bordos E, Tierney C, Ojo E, Elkes R, Reynolds G, Li Song Y, Meir B, Fathollahi S, Robertson J. A modified Kushner-Moore approach to characterising small-scale blender performance impact on tablet compaction. Int J Pharm 2024; 659:124232. [PMID: 38759740 DOI: 10.1016/j.ijpharm.2024.124232] [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: 01/30/2024] [Revised: 05/02/2024] [Accepted: 05/14/2024] [Indexed: 05/19/2024]
Abstract
Continuous Direct Compaction (CDC) has emerged as a promising route towards producing solid dosage forms while reducing material, development time and energy consumption. Understanding the response of powder processing unit operations, especially blenders, is crucial. There is a substantial body of work around how lubrication via batch blender operation affects tablet critical quality attributes such as hardness and tensile strength. But, aside from being batch operations, the design of these blenders is such that they operate with low-shear, low-intensity mixing at Froude number values significantly below 0.4 (Froude number Fr being the dimensionless ratio of inertial to gravitational forces). The present work explores the performance of a mini-blender which has a fundamentally different mode of operation (static vessel with rotating blades around a mixing shaft as opposed to rotating vessel with no mixing shaft). This difference allows a substantially wider operating range in terms of speed and shear (and Fr values). The present work evaluates how its performance compares to other blenders studied in the literature. Tablet compaction data from blends produced at various intensities and regimes of mixing in the mini-blender follow a common trajectory. Model equations from literature are suitably modified by inclusion of the Froude number Fr, but only for situations where the Froude number was sufficiently high (1 < Fr). The results suggest that although a similar lubrication extent plateau is eventually reached it is the intensity of mixing (i.e. captured using the Froude number as a surrogate) which is important for the lubrication dynamics in the mini-blender, next to the number of revolutions. The degree of fill or headspace, on the other hand, is only crucial to the performance of common batch blenders. Testing using alternative formulations shows the same common trend across mixing intensities, suggesting the validity of the approach to capture lubrication dynamics for this system.
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Affiliation(s)
- Hikaru G Jolliffe
- CMAC, Technology and Innovation Centre, 99 George Street, Glasgow G1 1RD, UK
| | - Martin Prostredny
- CMAC, Technology and Innovation Centre, 99 George Street, Glasgow G1 1RD, UK
| | | | - Ecaterina Bordos
- CMAC, Technology and Innovation Centre, 99 George Street, Glasgow G1 1RD, UK
| | - Collette Tierney
- CMAC, Technology and Innovation Centre, 99 George Street, Glasgow G1 1RD, UK
| | - Ebenezer Ojo
- CMAC, Technology and Innovation Centre, 99 George Street, Glasgow G1 1RD, UK
| | - Richard Elkes
- GSK Ware R&D, Harris's Lane, Ware, Hertfordshire SG12 0GX, UK
| | - Gavin Reynolds
- Oral Product Development, PT&D, Operations, AstraZeneca UK Limited, Charter Way, Macclesfield SK10 2NA, UK
| | - Yunfei Li Song
- GSK Ware R&D, Harris's Lane, Ware, Hertfordshire SG12 0GX, UK
| | - Bernhard Meir
- Gericke AG, Althardstrasse 120, CH-8105 Regensdorf, Switzerland
| | - Sara Fathollahi
- DFE Pharma GmbH & Co. KG, Kleverstrasse 187, 47568 Goch, Germany
| | - John Robertson
- CMAC, Technology and Innovation Centre, 99 George Street, Glasgow G1 1RD, UK.
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2
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Polak P, Sinka IC, Reynolds GK, Roberts RJ. Successful Formulation Window for the design of pharmaceutical tablets with required mechanical properties. Int J Pharm 2024; 650:123705. [PMID: 38110016 DOI: 10.1016/j.ijpharm.2023.123705] [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: 10/10/2023] [Accepted: 12/11/2023] [Indexed: 12/20/2023]
Abstract
Pharmaceutical tablet formulations combine the active ingredient with processing aids and functional components. This paper evaluates compressibility based predictive models for binary and ternary formulations to establish an acceptable range of tablet compression parameters that satisfy prescribed quality target criteria for tablets including minimum tablet strength and processing constraints such as maximum ejection stress and maximum compaction pressure. The concept of Successful Formulation Window (SFW) is introduced. A methodology is proposed to determine the SFW for a given formulation based on compaction simulator data collected for individual formulation components. The methodology is validated for binary and ternary mixtures and lubricated formulations. The SFW analysis was developed to support tablet formulation design to meet mechanical requirements.
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Affiliation(s)
- P Polak
- School of Engineering, University of Leicester, UK
| | - I C Sinka
- School of Engineering, University of Leicester, UK.
| | - G K Reynolds
- Oral Product Development, Pharmaceutical Technology and Development, Operations, AstraZeneca, Macclesfield, UK
| | - R J Roberts
- Oral Product Development, Pharmaceutical Technology and Development, Operations, AstraZeneca, Macclesfield, UK
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3
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Puckhaber D, Voges AL, Rane S, David S, Gururajan B, Henrik Finke J, Kwade A. Enhanced multi-component model to consider the lubricant effect on compressibility and compactibility. Eur J Pharm Biopharm 2023; 187:24-33. [PMID: 37037386 DOI: 10.1016/j.ejpb.2023.04.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 03/27/2023] [Accepted: 04/04/2023] [Indexed: 04/12/2023]
Abstract
Modeling of structural and mechanical tablet properties consisting of multiple components, based on a minimum of experimental data is of high interest, in order to minimize time- and cost-intensive experimental trials in the development of new tablet formulations. The majority of commonly available models use the compressibility and compactibility of constituent components and establish mixing rules between those components, in order to predict the tablet properties of formulations containing multiple components. However, their applicability is limited to single materials, which form intact tablets (e.g. lactose, cellulose) and therefore, they cannot be applied for lubricants. Lubricants are required in the majority of industrial tablet formulations and usually influence the mechanical strength of tablets. This study combines the multi-component compaction model of Reynolds et al. (2017) with a recently published lubrication model (Puckhaber et al. 2020) to describe the impact of multiple components on a formulation consisting of two diluents and a lubricant. By that, this model combination displays a meaningful extension of existing compaction models and allows the systematic prediction of properties of lubricated multi-component tablets.
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Affiliation(s)
- Daniel Puckhaber
- Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Straße 5, 38104 Braunschweig, Germany; Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany.
| | - Anna-Lena Voges
- Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Straße 5, 38104 Braunschweig, Germany; Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany
| | | | | | | | - Jan Henrik Finke
- Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Straße 5, 38104 Braunschweig, Germany; Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany.
| | - Arno Kwade
- Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Straße 5, 38104 Braunschweig, Germany; Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany.
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4
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Wünsch I, Henrik Finke J, John E, Juhnke M, Kwade A. Influence of the drug deformation behaviour on the predictability of compressibility and compactibility of binary mixtures. Int J Pharm 2022; 626:122117. [PMID: 35985527 DOI: 10.1016/j.ijpharm.2022.122117] [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: 04/16/2022] [Revised: 08/06/2022] [Accepted: 08/11/2022] [Indexed: 10/15/2022]
Abstract
Various studies investigate the predictability of the compressibility and compactibility of tablet formulations based on the behaviour of the pure materials. However, these studies are limited to a few materials so far probably because of the complexity of the powder compaction process. One approach preventing the excessive increase in complexity is the extension of the investigations from pure materials to binary powder mixtures. The focus of this study is on the predictability of the compressibility and compactibility of binary mixtures consisting of an active pharmaceutical ingredient (API) and the excipient microcrystalline cellulose. Three APIs with markedly different deformation behaviour were used. The API concentration and type are systematically varied. For all three material combinations it is found that the in-die compressibility of the binary mixtures can be precisely predicted based on the characteristic compression parameters of the raw materials using the extended in-die compression function in combination with a volume-based linear mixing rule. Since the tablet porosity (out-of-die) also follows a linear mixing rule, the predictability can be further extended using the method of Katz et al. In contrast, the influence of the API concentration on compactibility or rather on tablet tensile strength is non-linear and strongly dependent on the deformation behaviour of the API, making the predictability more difficult. Neither the approach of Reynolds et al. nor this of Kuentz and Leuenberger are able to predict the compactibility when clear deviations from a linear mixing rule appear.
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Affiliation(s)
- Isabell Wünsch
- Technische Universität Braunschweig, Institute for Particle Technology, Volkmaroder Straße 5, 38104, Braunschweig, Germany; Technische Universität Braunschweig, Center of Pharmaceutical Engineering (PVZ), Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany
| | - Jan Henrik Finke
- Technische Universität Braunschweig, Institute for Particle Technology, Volkmaroder Straße 5, 38104, Braunschweig, Germany; Technische Universität Braunschweig, Center of Pharmaceutical Engineering (PVZ), Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany
| | | | | | - Arno Kwade
- Technische Universität Braunschweig, Institute for Particle Technology, Volkmaroder Straße 5, 38104, Braunschweig, Germany; Technische Universität Braunschweig, Center of Pharmaceutical Engineering (PVZ), Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany
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5
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Widodo RT, Hassan A, Liew KB, Ming LC. A Directly Compressible Pregelatinised Sago Starch: A New Excipient in the Pharmaceutical Tablet Formulations. Polymers (Basel) 2022; 14:polym14153050. [PMID: 35956565 PMCID: PMC9370636 DOI: 10.3390/polym14153050] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 06/30/2022] [Accepted: 07/25/2022] [Indexed: 12/10/2022] Open
Abstract
An excipient intended for direct compression in pharmaceutical tableting must show important features of flowability and compactibility. This study investigated pregelatinised sago starch as an excipient for direct compression tablets. Pregelatinised sago starch was prepared and characterised. Its powder bulk properties and performance in the tablet formulations with paracetamol as a model drug were compared against two commercial, directly compressible excipients, namely Avicel® PH 101 and Spress® B820. The results showed that pregelatinisation did not affect the chemical structure of sago starch, but its degree of crystallinity reduced, and X-ray diffraction pattern changed from C-type to A-type. Powder bulk properties of pregelatinised sago starch and Spress® B820 were comparable, exhibiting better flowability but lower compactibility than Avicel® PH 101. In the formulation of paracetamol tablets, pregelatinised sago starch and Spress® B820 performed equally well, followed by Avicel® PH 101 as indicated in Formulations 3, 2 and 1, respectively.
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Affiliation(s)
- Riyanto Teguh Widodo
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Universiti Malaya, Kuala Lumpur 50603, Malaysia
- Correspondence: (R.T.W.); (L.C.M.)
| | - Aziz Hassan
- Department of Chemistry, Faculty of Science, Universiti Malaya, Kuala Lumpur 50603, Malaysia;
| | - Kai Bin Liew
- Department of Pharmaceutical Technology and Industry, Faculty of Pharmacy, University of Cyberjaya, Cyberjaya 63000, Malaysia;
| | - Long Chiau Ming
- PAP Rashidah Sa’adatul Bolkiah Institute of Health Sciences, Universiti Brunei Darussalam, Gadong BE1410, Brunei
- Correspondence: (R.T.W.); (L.C.M.)
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6
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The effect of granules characters on mechanical properties of press-coated tablets: A comparative study. Int J Pharm 2022; 624:121986. [PMID: 35820516 DOI: 10.1016/j.ijpharm.2022.121986] [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: 02/22/2022] [Revised: 07/02/2022] [Accepted: 07/02/2022] [Indexed: 11/20/2022]
Abstract
The aim of this study was to investigate the correlation between critical granules characters (including particle size, surface roughness, and apparent porosity) and mechanical properties of press-coated tablets. Granules of a model formulation were prepared through Roll Compaction Granulation (RCG), High Shear Granulation (HSG), and Fluidized Bed Granulation (FBG) to prepare granules with different surface roughness and apparent porosity. The surface roughness and porosity of granules had a significantly greater effect on mechanical properties than the particle size of granules. Whether for brittle or plastic materials, FBG granules with the roughest surface and the greatest apparent porosity exhibited the best compression properties. The elastic recovery test, the interlayer adhesion forces study, the break pattern test, and the X-ray microcomputed tomography investigation suggested that granules with great apparent porosity and rough surfaces could contribute to the production of stable press-coated structures. Moreover, for press-coated tablets prepared using granules, the proper granules in the coat layer could eliminate the side effect of the rigid core on the mechanical strength. The above understandings will be conducive to the selection of compatible and appropriate granules characters, which can enhance mechanical properties and extend the application of press-coated tablets.
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7
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Rashid I, Haddadin RR, Alkafaween AA, Alkaraki RN, Alkasasbeh RM. Understanding the implication of Kawakita model parameters using in-die force-displacement curve analysis for compacted and non-compacted API powders. AAPS OPEN 2022. [DOI: 10.1186/s41120-022-00053-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
AbstractThe aim of this study was to investigate powder mechanics upon compression using data obtained from force-displacement (F-D) curves. The Kawakita model of powder compression analysis was adopted in order to compare the pressure-volume reduction relationship of the drug powders in relation to the F-D curves. Experiments were carried out on six model drugs (metronidazole, metformin, secnidazole, ciprofloxacin, norfloxacin, and mebeverine). The drugs were compressed at different pressures in the non-processed or processed (using a roller compactor) forms. Results indicate the similarity between the F-D curves and a rearranged form of the Kawakita model. The foregoing enables the calculation of two important powder parameters, “a” (maximum powder volume reduction) and “Pk” (pressure required to achieve half of the maximum volume reduction) from the F-D curves without the need, as in the case of the conventional Kawakita model, to compress powders into tablets at different compression forces.
Graphical abstract
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8
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Puckhaber D, Finke JH, David S, Serratoni M, Zafar U, John E, Juhnke M, Kwade A. Prediction of the impact of lubrication on tablet compactibility. Int J Pharm 2022; 617:121557. [PMID: 35134481 DOI: 10.1016/j.ijpharm.2022.121557] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 01/28/2022] [Accepted: 02/02/2022] [Indexed: 11/18/2022]
Abstract
The tableting of most pharmaceutical formulations requires the addition of lubricants to reduce ejection forces, prevent tooling damage and tablet defects. The internal addition of lubricants is known to reduce tablet tensile strength, especially of mainly plastically deforming materials. To date, available models show only limited quantitative predictive accuracy for the influence of lubricant concentration on the mechanical strength of tablets. This study aims to fill this gap and present a model based on the Ryshkewitch-Duckworth equation that can estimate the compactibility profiles of lubricated formulations. Binary mixtures of different diluents (microcrystalline cellulose and lactose) were prepared with common lubricants (magnesium stearate and sodium stearyl fumarate) and subsequently tableted. The resulting compactibility profiles were fitted using the Ryshkewitch-Duckworth equation and the derived fit parameters (kb and σ0) were correlated with the lubricant concentration. Subsequently, an empirical model was established which requires a minimum of experimental data and is able to predict the tensile strength of lubricated diluent tablets. Consequently, the developed empirical model is an interesting and valuable addition to the existing multi-component compacting models available and offers the opportunity to accelerate experimentation in the development of new tablet formulations.
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Affiliation(s)
- Daniel Puckhaber
- Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Straße 5, 38104 Braunschweig, Germany; Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany.
| | - Jan Henrik Finke
- Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Straße 5, 38104 Braunschweig, Germany; Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany.
| | - Sarah David
- Novartis Pharma AG, Basel 4002, Switzerland.
| | | | - Umair Zafar
- Novartis Pharma AG, Basel 4002, Switzerland.
| | - Edgar John
- Novartis Pharma AG, Basel 4002, Switzerland.
| | | | - Arno Kwade
- Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Straße 5, 38104 Braunschweig, Germany; Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany.
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9
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Vreeman G, Sun CC. Mean yield pressure from the in-die Heckel analysis is a reliable plasticity parameter. Int J Pharm X 2021; 3:100094. [PMID: 34458719 PMCID: PMC8379284 DOI: 10.1016/j.ijpx.2021.100094] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2021] [Revised: 07/23/2021] [Accepted: 08/10/2021] [Indexed: 11/17/2022] Open
Abstract
Despite the ability to characterize the plasticity of powders in a material-sparing and expedited manner, the in-die Heckel analysis has been widely criticized for its sensitivity to several factors, such as particle elastic deformation, tooling size, lubrication, and speed. Using materials exhibiting a wide range of mechanical properties, we show that the in-die Py correlates strongly with three established plasticity parameters obtained from the out-of-die Heckel analysis, Kuentz-Leuenberger analysis, and macroindentation. Thus, the in-die Py is a reliable parameter for quantifying powder plasticity in a material-sparing and expedited manner.
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Affiliation(s)
| | - Changquan Calvin Sun
- Corresponding author at: 9-127B Weaver-Densford Hall, 308 Harvard Street S.E., Minneapolis, MN 55455, United States.
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10
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A compression behavior classification system of pharmaceutical powders for accelerating direct compression tablet formulation design. Int J Pharm 2019; 572:118742. [PMID: 31648016 DOI: 10.1016/j.ijpharm.2019.118742] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 08/26/2019] [Accepted: 09/26/2019] [Indexed: 02/06/2023]
Abstract
In this paper, a compression behavior classification system (CBCS) for direct compression (DC) pharmaceutical powders is presented. Seven descriptors from a series of compression models for powder compressibility, compactibility and tabletability analysis were included in the CBCS. A new tabletability index d was proposed to differentiate three categories of tensile strength (TS) vs. pressure relationships, and its physical meaning was explained thoroughly. 130 materials containing diverse pharmaceutical excipients and natural product powders (NPPs) were fully characterized and were compiled into an in-house developed material library, in which 70 materials with potential DC applications were used to justify the effectiveness of the CBCS. Principle component analysis (PCA) was used to uncover the latent structure of compression variables. Moreover, partial least squares (PLS) regression models are established in prediction of both tablet TS and solid fraction (SF) based on the raw materials' physical characteristics, the compression behavior indices and the compression force. The obtained scores and loadings are used to group the materials and the compression variables, respectively. Different categories of tabletability for DC powders were clearly clustered along two orthogonal directions pointing to the index d and the compression force. Finally, a multi-objective design space was identified under the latent variable space, summarizing the operationally possible region for both material properties and compression pressure required in DC tablet formulation design.
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11
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Tanner T, Antikainen O, Pollet A, Räikkönen H, Ehlers H, Juppo A, Yliruusi J. Predicting tablet tensile strength with a model derived from the gravitation-based high-velocity compaction analysis data. Int J Pharm 2019; 566:194-202. [PMID: 31100384 DOI: 10.1016/j.ijpharm.2019.05.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 05/05/2019] [Accepted: 05/10/2019] [Indexed: 11/26/2022]
Abstract
In the present study, a model was developed to estimate tablet tensile strength utilizing the gravitation-based high-velocity (G-HVC) method introduced earlier. Three different formulations consisting of microcrystalline cellulose (MCC), dicalcium phosphate dihydrate (DCP), hydroxypropyl methylcellulose (HPMC), theophylline and magnesium stearate were prepared. The formulations were granulated using fluid bed granulation and the granules were compacted with the G-HVC method and an eccentric tableting machine. Compaction energy values defined from G-HVC data predicted tensile strength of the tablets surprisingly well. It was also shown, that fluid bed granulation improved the compaction energy intake of the granules in comparison to respective physical mixtures. In addition, general mechanical properties and elastic recovery were also examined for all samples. In this study it was finally concluded, that the data obtained by the method was of practical relevance in pharmaceutical formulation development.
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Affiliation(s)
- Timo Tanner
- Faculty of Pharmacy, Division of Pharmaceutical Chemistry and Technology, University of Helsinki, Finland.
| | - Osmo Antikainen
- Faculty of Pharmacy, Division of Pharmaceutical Chemistry and Technology, University of Helsinki, Finland
| | - Arne Pollet
- Faculty of Pharmaceutical Sciences, Ghent University, Belgium
| | - Heikki Räikkönen
- Faculty of Pharmacy, Division of Pharmaceutical Chemistry and Technology, University of Helsinki, Finland
| | - Henrik Ehlers
- Faculty of Pharmacy, Division of Pharmaceutical Chemistry and Technology, University of Helsinki, Finland
| | - Anne Juppo
- Faculty of Pharmacy, Division of Pharmaceutical Chemistry and Technology, University of Helsinki, Finland
| | - Jouko Yliruusi
- Faculty of Pharmacy, Division of Pharmaceutical Chemistry and Technology, University of Helsinki, Finland
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12
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Nordström J, Alderborn G, Frenning G. Compressibility and tablet forming ability of bimodal granule mixtures: Experiments and DEM simulations. Int J Pharm 2018; 540:120-131. [DOI: 10.1016/j.ijpharm.2018.02.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 01/31/2018] [Accepted: 02/04/2018] [Indexed: 10/18/2022]
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13
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Chomto P, Nunthanid J. Physicochemical and powder characteristics of various citrus pectins and their application for oral pharmaceutical tablets. Carbohydr Polym 2017; 174:25-31. [DOI: 10.1016/j.carbpol.2017.06.049] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 05/16/2017] [Accepted: 06/13/2017] [Indexed: 10/19/2022]
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14
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On Identification of Critical Material Attributes for Compression Behaviour of Pharmaceutical Diluent Powders. MATERIALS 2017; 10:ma10070845. [PMID: 28773204 PMCID: PMC5551887 DOI: 10.3390/ma10070845] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 06/14/2017] [Accepted: 07/20/2017] [Indexed: 11/16/2022]
Abstract
As one of the commonly-used solid dosage forms, pharmaceutical tablets have been widely used to deliver active drugs into the human body, satisfying patient's therapeutic requirements. To manufacture tablets of good quality, diluent powders are generally used in formulation development to increase the bulk of formulations and to bind other inactive ingredients with the active pharmaceutical ingredients (APIs). For formulations of a low API dose, the drug products generally consist of a large fraction of diluent powders. Hence, the attributes of diluents become extremely important and can significantly influence the final product property. Therefore, it is essential to accurately characterise the mechanical properties of the diluents and to thoroughly understand how their mechanical properties affect the manufacturing performance and properties of the final products, which will build a sound scientific basis for formulation design and product development. In this study, a comprehensive evaluation of the mechanical properties of the widely-used pharmaceutical diluent powders, including microcrystalline cellulose (MCC) powders with different grades (i.e., Avicel PH 101, Avicel PH 102, and DG), mannitol SD 100, lactose monohydrate, and dibasic calcium phosphate, were performed. The powder compressibility was assessed with Heckel and Kawakita analyses. The material elastic recovery during decompression and in storage was investigated through monitoring the change in the dimensions of the compressed tablets over time. The powder hygroscopicity was also evaluated to examine the water absorption ability of powders from the surroundings. It was shown that the MCC tablets exhibited continuous volume expansion after ejection, which is believed to be induced by (1) water absorption from the surrounding, and (2) elastic recovery. However, mannitol tablets showed volume expansion immediately after ejection, followed by the material shrinkage in storage. It is anticipated that the expansion was induced by elastic recovery to a limited extent, while the shrinkage was primarily due to the solidification during storage. It was also found that, for all powders considered, the powder compressibility and the elastic recovery depended significantly on the particle breakage tendency: a decrease in the particle breakage tendency led to a slight decrease in the powder compressibility and a significant drop in immediate elastic recovery. This implies that the particle breakage tendency is a critical material attribute in controlling the compression behaviour of pharmaceutical powders.
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15
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Radojevic J, Zavaliangos A. On the Post-Compaction Evolution of Tensile Strength of Sodium Chloride-Starch Mixture Tablets. J Pharm Sci 2017; 106:2088-2096. [PMID: 28495565 DOI: 10.1016/j.xphs.2017.04.079] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Revised: 04/21/2017] [Accepted: 04/26/2017] [Indexed: 11/19/2022]
Abstract
This study focuses on the evolution of mechanical behavior of starch and sodium chloride (NaCl) mixture tablets after compaction. This type of mixture has attracted attention in the past because such tablets exhibit lower tensile strengths than the ones of its individual components. Here we demonstrate that the strengths of NaCl-starch mixtures and NaCl tablets evolve after compaction in an opposite way. When stored at relative humidity of 60%, NaCl tablets strengthen with time, whereas NaCl-starch mixtures weaken. To explain this behavior, we propose that in the NaCl-starch mixture, the presence of 2 materials with significantly different elastic moduli leads to creation of tensile stresses at the stiffer NaCl-NaCl contacts. Such tensile stresses lead to a reduction in strength of the compacted mixtures by negating a local dissolution-reprecipitation mechanism, which strengthens the NaCl-NaCl in pure NaCl tablet. This effect is proven by experimental results from NaCl specimens diametrically loaded during storage.
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Affiliation(s)
- Jovana Radojevic
- Department of Materials Science & Engineering, Drexel University, Philadelphia, Pennsylvania 19104
| | - Antonios Zavaliangos
- Department of Materials Science & Engineering, Drexel University, Philadelphia, Pennsylvania 19104.
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16
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17
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Spray-dried composite particles of erythritol and porous silica for orally disintegrating tablets prepared by direct tableting. POWDER TECHNOL 2015. [DOI: 10.1016/j.powtec.2015.08.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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18
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Arifvianto B, Leeflang M, Zhou J. The compression behaviors of titanium/carbamide powder mixtures in the preparation of biomedical titanium scaffolds with the space holder method. POWDER TECHNOL 2015. [DOI: 10.1016/j.powtec.2015.06.033] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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19
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Widodo RT, Hassan A. Compression and mechanical properties of directly compressible pregelatinized sago starches. POWDER TECHNOL 2015. [DOI: 10.1016/j.powtec.2014.08.039] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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20
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Gala U, Chauhan H. Principles and applications of Raman spectroscopy in pharmaceutical drug discovery and development. Expert Opin Drug Discov 2014; 10:187-206. [DOI: 10.1517/17460441.2015.981522] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Urvi Gala
- 1Creighton University, School of Pharmacy and Health Professions, 2500 California Plaza, Omaha, NE 68178, USA
| | - Harsh Chauhan
- 2Creighton University, School of Pharmacy and Health Professions, Department of Pharmacy Sciences, 2500 California Plaza, Omaha, NE 68178, USA ;
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Al-khattawi A, Alyami H, Townsend B, Ma X, Mohammed AR. Evidence-based nanoscopic and molecular framework for excipient functionality in compressed orally disintegrating tablets. PLoS One 2014; 9:e101369. [PMID: 25025427 PMCID: PMC4098910 DOI: 10.1371/journal.pone.0101369] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 06/06/2014] [Indexed: 11/18/2022] Open
Abstract
The work investigates the adhesive/cohesive molecular and physical interactions together with nanoscopic features of commonly used orally disintegrating tablet (ODT) excipients microcrystalline cellulose (MCC) and D-mannitol. This helps to elucidate the underlying physico-chemical and mechanical mechanisms responsible for powder densification and optimum product functionality. Atomic force microscopy (AFM) contact mode analysis was performed to measure nano-adhesion forces and surface energies between excipient-drug particles (6-10 different particles per each pair). Moreover, surface topography images (100 nm2-10 µm2) and roughness data were acquired from AFM tapping mode. AFM data were related to ODT macro/microscopic properties obtained from SEM, FTIR, XRD, thermal analysis using DSC and TGA, disintegration testing, Heckel and tabletability profiles. The study results showed a good association between the adhesive molecular and physical forces of paired particles and the resultant densification mechanisms responsible for mechanical strength of tablets. MCC micro roughness was 3 times that of D-mannitol which explains the high hardness of MCC ODTs due to mechanical interlocking. Hydrogen bonding between MCC particles could not be established from both AFM and FTIR solid state investigation. On the contrary, D-mannitol produced fragile ODTs due to fragmentation of surface crystallites during compression attained from its weak crystal structure. Furthermore, AFM analysis has shown the presence of extensive micro fibril structures inhabiting nano pores which further supports the use of MCC as a disintegrant. Overall, excipients (and model drugs) showed mechanistic behaviour on the nano/micro scale that could be related to the functionality of materials on the macro scale.
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Affiliation(s)
- Ali Al-khattawi
- Aston School of Pharmacy, Aston University, Birmingham, United Kingdom
- Aston Research Centre for Healthy Ageing, Aston University, Birmingham, United Kingdom
| | - Hamad Alyami
- Aston School of Pharmacy, Aston University, Birmingham, United Kingdom
| | - Bill Townsend
- School of Engineering and Applied Science, Aston University, Birmingham, United Kingdom
- Aston Research Centre for Healthy Ageing, Aston University, Birmingham, United Kingdom
| | - Xianghong Ma
- School of Engineering and Applied Science, Aston University, Birmingham, United Kingdom
- Aston Research Centre for Healthy Ageing, Aston University, Birmingham, United Kingdom
| | - Afzal R. Mohammed
- Aston School of Pharmacy, Aston University, Birmingham, United Kingdom
- Aston Research Centre for Healthy Ageing, Aston University, Birmingham, United Kingdom
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22
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Mazel V, Busignies V, Diarra H, Tchoreloff P. On the Links Between Elastic Constants and Effective Elastic Behavior of Pharmaceutical Compacts: Importance of Poisson’s Ratio and Use of Bulk Modulus. J Pharm Sci 2013; 102:4009-14. [DOI: 10.1002/jps.23710] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Revised: 07/12/2013] [Accepted: 07/31/2013] [Indexed: 11/07/2022]
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23
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Iyer RM, Hegde S, DiNunzio J, Singhal D, Malick W. The impact of roller compaction and tablet compression on physicomechanical properties of pharmaceutical excipients. Pharm Dev Technol 2013; 19:583-92. [DOI: 10.3109/10837450.2013.813541] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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24
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Effects of particle size disparity on the compaction behavior of binary mixtures of pharmaceutical powders. POWDER TECHNOL 2013. [DOI: 10.1016/j.powtec.2012.07.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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25
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Gao L, Liu G, Ma J, Wang X, Zhou L, Li X, Wang F. Application of drug nanocrystal technologies on oral drug delivery of poorly soluble drugs. Pharm Res 2012; 30:307-24. [PMID: 23073665 DOI: 10.1007/s11095-012-0889-z] [Citation(s) in RCA: 124] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2012] [Accepted: 09/12/2012] [Indexed: 12/31/2022]
Abstract
The limited solubility and dissolution rate exhibited by poorly soluble drugs is major challenges in the pharmaceutical process. Following oral administration, the poorly soluble drugs generally show a low and erratic bioavailability which may lead to therapeutic failure. Pure drug nanocrystals, generated by "bottom up" or "top down" technologies, facilitate a significant improvement on dissolution behavior of poorly soluble drugs due to their enormous surface area, which in turn lead to substantial improvement in oral absorption. This is the most distinguished achievement of drug nanocrystals among their performances in various administration routes, reflected by the fact that most of the marketed products based on the nanocrystals technology are for oral application. After detailed investigations on various technologies associated with production of drug nanocrystals and their in vitro physicochemical properties, during the last decade more attentions have been paid into their in vivo behaviors. This review mainly describes the in vivo performances of oral drug nanocrystals exhibited in animals related to the pharmacokinetic, efficacy and safety characteristics. The technologies and evaluation associated with the solidification process of the drug nanocrystals suspensions were also discussed in detail.
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Affiliation(s)
- Lei Gao
- Department of Pharmacy, The First Affiliated Hospital of General Hospital of PLA, No. 51 Fucheng Road, Beijing, 100048, China.
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26
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Govedarica B, Ilić I, Šibanc R, Dreu R, Srčič S. The use of single particle mechanical properties for predicting the compressibility of pharmaceutical materials. POWDER TECHNOL 2012. [DOI: 10.1016/j.powtec.2012.03.030] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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27
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Busignies V, Mazel V, Diarra H, Tchoreloff P. Prediction of the compressibility of complex mixtures of pharmaceutical powders. Int J Pharm 2012; 436:862-8. [PMID: 22759643 DOI: 10.1016/j.ijpharm.2012.06.051] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Revised: 06/18/2012] [Accepted: 06/20/2012] [Indexed: 11/17/2022]
Abstract
The development of predictive models for the pharmaceutical compaction process is of great interest for not only the formulation step but also in the context of the quality by design development. This paper deals with the prediction of the compressibility, i.e. the prediction of the evolution of the density and the porosity of the compact along with the compaction pressure, both "in-die" (during the compaction) and "out-of-die (after the ejection of the compact). For this purpose, four different mixtures composed of five different pharmaceutical products were studied using a rotative press simulator. The excipients and formulations were chosen to be as near as possible to real industrial formulations. Using the volume as an additive property and a reformulation of the Kawakita equation as a function of the density, it was possible to predict the density of the compact both "in-die" and "out-of-die" with a good accuracy (residuals <3.5%). In most of the cases, for the pressure levels used in the pharmaceutical industry, the absolute error on the prediction of the porosity was below 2%. This study demonstrates that this approach could be well suited to predict the compressibility of real pharmaceutical formulations in the industrial context.
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Affiliation(s)
- V Busignies
- Univ Paris-Sud, UFR de Pharmacie, EA 401, Matériaux et Santé, 5 rue Jean-Baptiste Clément, Châtenay-Malabry, F-92296, France.
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28
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Tho I, Bauer-Brandl A. Quality by design (QbD) approaches for the compression step of tableting. Expert Opin Drug Deliv 2011; 8:1631-44. [DOI: 10.1517/17425247.2011.633506] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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29
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Choi DH, Jeong SH. Multi-Layered Matrix Tablets with Various Tablet Designs and Release Profiles. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2011. [DOI: 10.4333/kps.2011.41.5.263] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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30
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Original predictive approach to the compressibility of pharmaceutical powder mixtures based on the Kawakita equation. Int J Pharm 2011; 410:92-8. [DOI: 10.1016/j.ijpharm.2011.03.027] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2010] [Revised: 03/08/2011] [Accepted: 03/13/2011] [Indexed: 11/23/2022]
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31
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Ruangchayajatuporn J, Amornsakchai T, Sinchaipanid N, Mitrevej A. Compaction behavior and optimization of spray-dried lactose with various amorphous content. J Drug Deliv Sci Technol 2011. [DOI: 10.1016/s1773-2247(11)50019-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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32
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Critical factors in manufacturing multi-layer tablets—Assessing material attributes, in-process controls, manufacturing process and product performance. Int J Pharm 2010; 398:9-13. [DOI: 10.1016/j.ijpharm.2010.07.025] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2010] [Revised: 07/13/2010] [Accepted: 07/17/2010] [Indexed: 11/20/2022]
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33
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Sucrose esters with various hydrophilic-lipophilic properties: novel controlled release agents for oral drug delivery matrix tablets prepared by direct compaction. Acta Biomater 2010; 6:3101-9. [PMID: 20132913 DOI: 10.1016/j.actbio.2010.01.044] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2009] [Revised: 01/18/2010] [Accepted: 01/28/2010] [Indexed: 11/20/2022]
Abstract
Sucrose esters (SE) are esters of sucrose and fatty acids with various hydrophilic-lipophilic properties which have attracted interest from being used in pharmaceutical applications. This study aimed to gain insight into the use of SE as controlled release agents for direct compacted matrix tablets. The study focused on the effect of hydrophilic-lipophilic properties on tableting properties and drug release. Sucrose stearate with hydrophilic-lipophilic balance (HLB) values ranging from 0 to 16 was systematically tested. Tablet formulations contained SE, metoprolol tartrate as a highly soluble model drug and dibasic calcium phosphate dihydrate as a tablet formulation filler in the ratio 1:1:2. The compaction behaviour of matrix tablets was compared with the compacts of individual starting materials as reference. SE incorporation improved the plasticity, compressibility and lubricating property of powder mixtures. The hydrophilic-lipophilic properties of SE affected tableting properties, drug release rate and release mechanism. Increasing hydrophilicity corresponding to the increased monoesters in SE composition increased the relative porosity, elastic recovery and tensile strength of the tablets due to the increased hydrogen bonding between the monoesters. This also facilitated the swelling behaviour of SE, which sustained the drug release rate. A sustained release effect prevailed in tablets containing SE with HLB values of 3-16. The ability to improve the tableting properties as well as sustain the drug release rate of the highly soluble model drug via gelation of SE highlights SE as promising controlled release regulators for direct compacted matrix tablets comprising drugs with various solubilities according to the Biopharmaceutics Classification System.
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34
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Busignies V, Leclerc B, Truchon S, Tchoreloff P. Changes in the specific surface area of tablets composed of pharmaceutical materials with various deformation behaviors. Drug Dev Ind Pharm 2010; 37:225-33. [DOI: 10.3109/03639045.2010.504925] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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35
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Michaut F, Busignies V, Fouquereau C, Huet de Barochez B, Leclerc B, Tchoreloff P. Evaluation of a Rotary Tablet Press Simulator as a Tool for the Characterization of Compaction Properties of Pharmaceutical Products. J Pharm Sci 2010; 99:2874-85. [DOI: 10.1002/jps.22032] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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36
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Patel S, Kaushal AM, Bansal AK. Mechanistic investigation on pressure dependency of Heckel parameter. Int J Pharm 2010; 389:66-73. [DOI: 10.1016/j.ijpharm.2010.01.020] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2009] [Revised: 12/31/2009] [Accepted: 01/10/2010] [Indexed: 10/20/2022]
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37
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Tableting process optimisation with the application of fuzzy models. Int J Pharm 2010; 389:86-93. [DOI: 10.1016/j.ijpharm.2010.01.023] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2009] [Revised: 01/08/2010] [Accepted: 01/12/2010] [Indexed: 11/21/2022]
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38
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Synchrotron X-ray microtomographic study of tablet swelling. Eur J Pharm Biopharm 2010; 75:263-76. [PMID: 20172028 DOI: 10.1016/j.ejpb.2010.02.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2009] [Revised: 01/20/2010] [Accepted: 02/15/2010] [Indexed: 11/23/2022]
Abstract
Tablet swelling behaviour was investigated by following the movements of embedded glass microsphere tracers, using X-ray microtomography (XmicroT) with intense illumination from a synchrotron. Specimens were prepared using combinations of hydroxypropyl-methyl-cellulose (HPMC) and microcrystalline cellulose (MCC) or pre-gelatinised starch (PGS), three materials commonly used as excipients for compacted tablets. The results revealed significant differences in swelling behaviour due to excipient type and compaction conditions. In particular, a sudden change was observed from gel-forming behaviour of formulations containing PGS or high HPMC content, to more rapid expansion and disintegration for formulations above 70% MCC. Although some radial expansion was observable with the higher PGS formulations and during later stages of swelling, axial expansion (i.e. the reverse of the compaction process) appeared to dominate in most cases. This was most pronounced for the 10/90 HPMC/MCC specimens, which rapidly increased in thickness, while the diameter remained almost unchanged. The expansion appeared to be initiated by hydration and may be due to the relaxation of residual compaction stress. This occurred within 'expansion zones', which initially appeared as thin bands close to the compacted (upper and lower) faces, but gradually advanced towards the centre and spread around the sides of the tablets. These zones exhibited lower X-ray absorbance, probably because they contained significant amounts of bubbles, which were formed by air released from the swelling excipients. Although, in most cases, these bubbles were too small to be resolved (<60 microm), larger bubbles (diameter up to 1mm) were clearly evident in the rapidly swelling 10/90 HPMC/MCC specimens. It is suggested that the presence of these bubbles may affect subsequent water ingress, by increasing the tortuosity and occluding part of the gel, which may affect the apparent diffusion kinetics (i.e. Fickian or Case II). These observations also suggested that axial expansion, initiated by water ingress, may be an important mechanism during tablet swelling.
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39
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Cantor SL, Kothari S, Koo OM. Evaluation of the physical and mechanical properties of high drug load formulations: Wet granulation vs. novel foam granulation. POWDER TECHNOL 2009. [DOI: 10.1016/j.powtec.2009.05.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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40
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Belič A, Škrjanc I, Božič DZ, Karba R, Vrečer F. Minimisation of the capping tendency by tableting process optimisation with the application of artificial neural networks and fuzzy models. Eur J Pharm Biopharm 2009; 73:172-8. [DOI: 10.1016/j.ejpb.2009.05.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2008] [Revised: 05/13/2009] [Accepted: 05/15/2009] [Indexed: 10/20/2022]
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41
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42
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Hersen-Delesalle C, Leclerc B, Couarraze G, Busignies V, Tchoreloff P. The Effects of Relative Humidity and Super-Disintegrant Concentrations on the Mechanical Properties of Pharmaceutical Compacts. Drug Dev Ind Pharm 2008; 33:1297-307. [DOI: 10.1080/03639040701384918] [Citation(s) in RCA: 13] [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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43
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Wu YS, Frijlink HW, van Vliet LJ, van der Voort Maarschalk K. Pore shape in the sodium chloride matrix of tablets after the addition of starch as a second component. Eur J Pharm Biopharm 2008; 70:539-43. [PMID: 18582573 DOI: 10.1016/j.ejpb.2008.05.028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2008] [Revised: 05/13/2008] [Accepted: 05/19/2008] [Indexed: 10/22/2022]
Abstract
The present research aims to test the hypothesis that the addition of a minor component causes a change in pore shape in the matrix of the primary component, causing a decrease in mechanical strength. Tablets made of sodium chloride only and tablets made of a mixture of sodium chloride (97.5% v/v) and starch (2.5% v/v) were compared. Tablets were subjected to a heat treatment to remove the starch. The pore structure was evaluated with mercury porosimetry and image analysis on SEM images. At comparable porosities the tensile strength of the mixture tablets was significantly lower than that of the tablets made of NaCl only. Visual inspection of the images suggested a structure with less connectivity of the grains for the heat treated mixture tablets. This was confirmed by the results of the algorithm calculating the relative path length. Image analysis showed that the pore size distribution shifted towards larger pores after the addition of starch. It was thus concluded that the lower mechanical strength of the tablets made of the binary mixture was caused by the more open pore structure and more larger pores as could be detected with image analysis.
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Affiliation(s)
- Yu San Wu
- Department of Pharmaceutical Technology and Biopharmacy, University of Groningen, Groningen, The Netherlands.
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44
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Yap SF, Adams MJ, Seville JP, Zhang Z. Single and bulk compression of pharmaceutical excipients: Evaluation of mechanical properties. POWDER TECHNOL 2008. [DOI: 10.1016/j.powtec.2007.09.005] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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45
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Michrafy A, Michrafy M, Kadiri MS, Dodds JA. Predictions of tensile strength of binary tablets using linear and power law mixing rules. Int J Pharm 2007; 333:118-26. [PMID: 17097245 DOI: 10.1016/j.ijpharm.2006.10.008] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2005] [Revised: 10/03/2006] [Accepted: 10/06/2006] [Indexed: 11/29/2022]
Abstract
There has recently been an increased interest in predicting the tensile strength of binary tablets from the properties of the individual components. In this paper, measurements are reported for tensile strength of tablets compressed from single-component and binary powder mixtures of lactose with microcrystalline cellulose (MCC), and lactose with two types of silicified microcrystalline cellulose (SMCC and SMCC-HD), which are different in compressibility. Measurements show the tensile strength increases with the relative density for single powders, and both with the relative density and the mass fraction of cellulose in the mixtures. It was also observed, for binary mixtures compacted at 50 and 150 MPa, that there was a slight variation in porosity with the mass fraction of celluloses. The predictions of the tensile strength of binary tablets from the characteristics of the single-components was analysed with the extended Ryshkewitch-Duckworth model by assuming both linear and power law mixing rules for the determination of the parameters "tensile strength at zero porosity and bonding capacity constant". As consequence, four models were analysed and compared with measurements using criteria based on the standard deviation from the mean values. Results showed a good prediction using a linear mixing rule combined with the power law. However, as the predictions of these models depend on the powders and the porosity range for the characterization of single-components, none of them can be systematically considered as being the best to predict binary behaviour from data for individual powders.
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Affiliation(s)
- A Michrafy
- Chemical Engineering Laboratory for Particulate Solids, UMR CNRS 2392, Ecole des Mines d'Albi-Carmaux, Campus Jarlard, Albi, France.
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