1
|
Najib M, Hammond RB, Mahmud T, Izumi T. Impact of Inequivalent Wetting on the Face-Specific Dissolution Rates for Single Faceted-Crystals Predicted from Solid-State Binding Energies. CRYSTAL GROWTH & DESIGN 2024; 24:4894-4905. [PMID: 38911133 PMCID: PMC11191405 DOI: 10.1021/acs.cgd.2c00043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 05/16/2024] [Accepted: 05/17/2024] [Indexed: 06/25/2024]
Abstract
A methodology for the prediction of face-specific relative dissolution rates for single-faceted crystals accounting for inequivalent wetting by the solvent is presented. This method is an extended form of a recent binding energy model developed by the authors (Najib et al., Cryst. Growth & Des. 2021, 21(3), 1482-1495) for predicting the face-specific dissolution rates for single-faceted crystals from the solid-state intermolecular binding energies in a vacuum. The principal modification is that the equivalent wetting of the crystal surfaces is no longer assumed, since interactions between the crystal surfaces and the solution-state molecules are incorporated. These surface interactions have been investigated by using a grid-based systematic search method. The face-specific dissolution rates predicted by the extended binding energy model for ibuprofen in a 95% v/v ethanol-water solution and furosemide in an aqueous medium have been validated against the published experimental results and are in excellent agreement. This model is a step forward toward accurate predictions of the relative face-specific dissolution rates for a wide variety of faceted crystals in any dissolution medium.
Collapse
Affiliation(s)
- Muhammad Najib
- Centre
for Doctoral Training in Complex Particulate Products and Processes
(CDT CP3), School of Chemical and Process Engineering, The University of Leeds, Leeds LS2 9JT, U.K.
| | - Robert B. Hammond
- School
of Chemical and Process Engineering, The
University of Leeds, Leeds LS2 9JT, U.K.
| | - Tariq Mahmud
- School
of Chemical and Process Engineering, The
University of Leeds, Leeds LS2 9JT, U.K.
| | - Toshiko Izumi
- Pfizer
Research & Development U.K., Ramsgate Road, Sandwich, Kent CT13 9NJ, U.K.
| |
Collapse
|
2
|
Ma CY, Nguyen TTH, Gajjar P, Styliari ID, Hammond RB, Withers PJ, Murnane D, Roberts KJ. Predicting the Strength of Cohesive and Adhesive Interparticle Interactions for Dry Powder Inhalation Blends of Terbutaline Sulfate with α-Lactose Monohydrate. Mol Pharm 2023; 20:5019-5031. [PMID: 37682633 PMCID: PMC10548469 DOI: 10.1021/acs.molpharmaceut.3c00292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 08/17/2023] [Accepted: 08/17/2023] [Indexed: 09/10/2023]
Abstract
Grid-based systematic search methods are used to investigate molecule-molecule, molecule-surface, and surface-surface contributions to interparticle interactions in order to identify the crystal faces that most strongly affect particle behavior during powder blend formulation and delivery processes. The model system comprises terbutaline sulfate (TBS) as an active pharmaceutical ingredient (API) and α-form lactose monohydrate (LMH). A combination of systematic molecular modeling and X-ray computed tomography (XCT) is used to determine not only the adhesive and cohesive interparticle energies but, also the agglomeration behavior during manufacturing and de-agglomeration behavior during delivery after inhalation. This is achieved through a detailed examination of the balance between the adhesive and cohesive energies with the XCT results confirming the blend segregation tendencies, through the particle-particle de-agglomeration process. The results reveal that the cohesive interaction energies of TBS-TBS are higher than the adhesive energies between TBS and LMH, but that the cohesive energies of LMH-LMH are the smallest between molecule and molecule, molecule and surface, and surface and surface. This shows how systematic grid-search molecular modeling along with XCT can guide the digital formulation design of inhalation powders in order to achieve optimum aerosolization and efficacy for inhaled medicines. This will lead to faster pharmaceutical design with less variability, higher quality, and enhanced performance.
Collapse
Affiliation(s)
- Cai Y. Ma
- Centre
for the Digital Design of Drug Products, School of Chemical and Process
Engineering, University of Leeds, Leeds, LS2 9JT, U.K.
| | - Thai T. H. Nguyen
- Centre
for the Digital Design of Drug Products, School of Chemical and Process
Engineering, University of Leeds, Leeds, LS2 9JT, U.K.
| | - Parmesh Gajjar
- School
of Materials, Henry Royce Institute, University
of Manchester, Oxford
Road, Manchester, M13 9PL, U.K.
| | - Ioanna D. Styliari
- School
of Life and Medical Sciences, University
of Hertfordshire, College Lane, Hatfield, AL10 9AB, U.K.
| | - Robert B. Hammond
- Centre
for the Digital Design of Drug Products, School of Chemical and Process
Engineering, University of Leeds, Leeds, LS2 9JT, U.K.
| | - Philip J. Withers
- School
of Materials, Henry Royce Institute, University
of Manchester, Oxford
Road, Manchester, M13 9PL, U.K.
| | - Darragh Murnane
- School
of Life and Medical Sciences, University
of Hertfordshire, College Lane, Hatfield, AL10 9AB, U.K.
| | - Kevin J. Roberts
- Centre
for the Digital Design of Drug Products, School of Chemical and Process
Engineering, University of Leeds, Leeds, LS2 9JT, U.K.
| |
Collapse
|
3
|
Gajjar P, Styliari ID, Legh-Land V, Bale H, Tordoff B, Withers PJ, Murnane D. Microstructural insight into inhalation powder blends through correlative multi-scale X-ray computed tomography. Eur J Pharm Biopharm 2023; 191:265-275. [PMID: 37657613 DOI: 10.1016/j.ejpb.2023.08.016] [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: 04/17/2023] [Revised: 08/09/2023] [Accepted: 08/25/2023] [Indexed: 09/03/2023]
Abstract
Dry powder inhalers (DPI) are important for topical drug delivery to the lungs, but characterising the pre-aerosolised powder microstructure is a key initial step in understanding the post-aerosolised blend performance. In this work, we characterise the pre-aerosolised 3D microstructure of an inhalation blend using correlative multi-scale X-ray Computed Tomography (XCT), identifying lactose and drug-rich phases at multiple length scales on the same sample. The drug-rich phase distribution across the sample is shown to be homogeneous on a bulk scale but heterogeneous on a particulate scale, with individual clusters containing different amounts of drug-rich phase, and different parts of a carrier particle coated with different amounts of drug-rich phase. Simple scalings of the drug-rich phase thickness with carrier particle size are used to derive the drug-proportion to carrier particle size relationship. This work opens new doors to micro-structural assessment of inhalation powders that could be invaluable for bioequivalence assessment of dry powder inhalers.
Collapse
Affiliation(s)
- Parmesh Gajjar
- Henry Moseley X-ray Imaging Facility, Department of Materials, The University of Manchester, Manchester M13 9PL, UK; National Facility for Laboratory X-ray Computed Tomography, The University of Manchester, Manchester M13 9PL, UK; Henry Royce Institute for Advanced Materials, Oxford Road, Manchester M13 9PL, UK; Seda Pharmaceutical Development Services, Unit D, Oakfield Road, Cheadle Royal Business Park, Stockport SK8 3GX, UK.
| | - Ioanna Danai Styliari
- School of Life and Medical Sciences, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
| | - Victoria Legh-Land
- School of Life and Medical Sciences, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
| | - Hrishikesh Bale
- Carl Zeiss X-ray Microscopy, 5300 Central Parkway, Dublin, CA 94568, USA
| | - Benjamin Tordoff
- Carl Zeiss Microscopy GmbH, Carl-Zeiss-Straße 22, 73447 Oberkochen, Germany
| | - Philip J Withers
- Henry Moseley X-ray Imaging Facility, Department of Materials, The University of Manchester, Manchester M13 9PL, UK; National Facility for Laboratory X-ray Computed Tomography, The University of Manchester, Manchester M13 9PL, UK; Henry Royce Institute for Advanced Materials, Oxford Road, Manchester M13 9PL, UK
| | - Darragh Murnane
- School of Life and Medical Sciences, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK.
| |
Collapse
|
4
|
Zellnitz-Neugebauer S, Lanzinger M, Schroettner H, Naderi M, Guo M, Paudel A, Gruber-Woelfler H, Neugebauer P. Temperature cycling-induced formation of crystalline coatings. Int J Pharm 2023; 632:122577. [PMID: 36596318 DOI: 10.1016/j.ijpharm.2022.122577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 12/28/2022] [Accepted: 12/29/2022] [Indexed: 01/01/2023]
Abstract
The surface of particles is the hotspot of interaction with their environment and is therefore a major target for particle engineering. Particles with tailored coatings are greatly desired for a range of different applications. Amorphous coatings applied via film coating or microencapsulation have frequently been described in the pharmaceutical context and usually result in homogeneous surfaces. In the present study we have been exploring the feasibility of coating core particles with crystalline substances, a matter that has rarely been investigated. The expansion of the range of possible coating materials to include small organic molecules enables completely new product properties to be achieved. We present an approach based on temperature cycles performed in a tubular crystallizer to result in engineered crystalline coatings on excipient core particles. By manipulating the process settings and by the choice of coating substance we are able to tailor surface roughness, topography as well as surface chemistry. Benefits of our approach are demonstrated by using resulting particles as carriers in dry-powder-inhaler formulations. Depending on the resulting surface chemistry and surface roughness, coated carrier particles show varying fitness for delivering the model API salbutamol sulphate to the lung.
Collapse
Affiliation(s)
| | - Magdalena Lanzinger
- Institute of Process and Particle Engineering, Graz University of Technology, Graz 8010, Austria
| | - Hartmuth Schroettner
- Institute of Electron Microscopy and Nanoanalysis (FELMI), Graz University of Technology, Graz 8010, Austria; Graz Centre for Electron Microscopy (ZFE), Graz 8010, Austria
| | - Majid Naderi
- Surface Measurement Systems Ltd., London HA0 4PE, United Kingdom
| | - Meishan Guo
- Surface Measurement Systems Ltd., London HA0 4PE, United Kingdom
| | - Amrit Paudel
- Research Center Pharmaceutical Engineering GmbH, Graz 8010, Austria; Institute of Process and Particle Engineering, Graz University of Technology, Graz 8010, Austria
| | - Heidrun Gruber-Woelfler
- Research Center Pharmaceutical Engineering GmbH, Graz 8010, Austria; Institute of Process and Particle Engineering, Graz University of Technology, Graz 8010, Austria
| | - Peter Neugebauer
- Research Center Pharmaceutical Engineering GmbH, Graz 8010, Austria; Institute of Process and Particle Engineering, Graz University of Technology, Graz 8010, Austria.
| |
Collapse
|
5
|
Ma CY, Moldovan AA, Maloney AGP, Roberts KJ. Exploring the CSD Drug Subset: An Analysis of Lattice Energies and Constituent Intermolecular Interactions for the Crystal Structures of Pharmaceuticals. J Pharm Sci 2023; 112:435-445. [PMID: 36462705 DOI: 10.1016/j.xphs.2022.11.027] [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: 06/14/2022] [Revised: 11/25/2022] [Accepted: 11/25/2022] [Indexed: 12/02/2022]
Abstract
Intermolecular (synthonic) modelling is used for a statistical analysis of crystal lattice energies, together with their contributing intermolecular interactions for the crystallographic structures selected from the CCDC's Drug Subset (https://doi.org/10.1016/j.xphs.2018.12.011). Analysis of this selected subset reveal similarities in packing compared to other organic crystals in the CSD with linear relationships between molecular weight and unit cell volume, void space, and packing coefficient. Crystal lattice energy calculations converge within a 30 Å intermolecular radius characterised by a mean lattice energy of ca. -36 kcal mol-1 with ca. 85% and 15% due to dispersive and electrostatic interactions, respectively. The distribution of the strongest synthons within the individual structures reveals an average strength of -5.79 kcal mol-1. The diversity of chemical space within the drug molecules is in agreement with the analysis of atom types across the selected subset with phenyl groups being found to contribute the highest mean energy of -11.28 kcal mol-1, highlighting the importance of aromatic interactions within pharmaceutical compounds. Despite an initial focus on Z' = 1 structures, this automated approach enables rapid and consistent quantitative analysis of lattice energy, synthon strength and functional group contributions, providing solid-form informatics for pharmaceutical R&D and a helpful basis for further investigations.
Collapse
Affiliation(s)
- Cai Y Ma
- Centre for the Digital Design of Drug Products, School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK.
| | - Alexandru A Moldovan
- The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge, CB2 1EZ, UK
| | - Andrew G P Maloney
- The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge, CB2 1EZ, UK
| | - Kevin J Roberts
- Centre for the Digital Design of Drug Products, School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK
| |
Collapse
|
6
|
Ren A, Koleng JJ, Costello M, Spahn JE, Smyth HDC, Zhang F. Twin-Screw Continuous Mixing Can Produce Dry Powder Inhalation Mixtures for Pulmonary Delivery. J Pharm Sci 2023; 112:272-281. [PMID: 36228755 DOI: 10.1016/j.xphs.2022.10.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 10/05/2022] [Accepted: 10/05/2022] [Indexed: 12/23/2022]
Abstract
The feasibility of twin-screw corotating extruder as a continuous process mixer to prepare dry powder inhalation (DPI) powders was investigated. Interactive mixtures of 1% micronized budesonide, 0.3% magnesium stearate and 98.7% alpha-lactose monohydrate were manufactured using a Leistritz Nano-16 extruder at various processing conditions. One set of GFM (grooved mixing) elements were included in the screw profile to provide distributive mixing of conveyed powders with the goal of resulting in a homogeneous mixture. Residence time in the twin-screw mixer was modelled to quantify mixing efficiency. Comparative powders were also prepared using either low or high-shear batch mixing to compare the effect of mixing methods on the properties of the budesonide dry powder inhalation formulation. Twin screw mixing results in homogeneous mixtures with aerosol performance comparable to that of high-shear batch mixing. Scanning electron microscopy confirmed that twin screw mixing produces particles with morphology like that of low and high-shear batch mixing. X-ray diffraction (XRD) analysis verified that there was no form change of the drug due to twin-screw processing. Statistical regression was used to probe the relationship between twin screw mixing process parameters such as screw speed and feed rate and aerosol performance. The twin screw mixing process was found to be robust, as no significant differences in aerosol performance were found for various processing parameters.
Collapse
Affiliation(s)
- Angela Ren
- Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, 2409 University Ave, Austin TX, 78712, USA
| | - John J Koleng
- Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, 2409 University Ave, Austin TX, 78712, USA
| | - Mark Costello
- Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, 2409 University Ave, Austin TX, 78712, USA
| | - Jamie E Spahn
- Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, 2409 University Ave, Austin TX, 78712, USA
| | - Hugh D C Smyth
- Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, 2409 University Ave, Austin TX, 78712, USA
| | - Feng Zhang
- Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, 2409 University Ave, Austin TX, 78712, USA.
| |
Collapse
|
7
|
Anuar N, Yusop SN, Roberts KJ. Crystallisation of organic materials from the solution phase: a molecular, synthonic and crystallographic perspective. CRYSTALLOGR REV 2022. [DOI: 10.1080/0889311x.2022.2123916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Affiliation(s)
- Nornizar Anuar
- School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam, Malaysia
- Centre for the Digital Design of Drug Products, School of Chemical and Process Engineering, University of Leeds, Leeds, UK
| | - Siti Nurul’ain Yusop
- School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam, Malaysia
| | - Kevin J. Roberts
- Centre for the Digital Design of Drug Products, School of Chemical and Process Engineering, University of Leeds, Leeds, UK
| |
Collapse
|
8
|
Klitou P, Rosbottom I, Karde V, Heng JY, Simone E. Relating Crystal Structure to Surface Properties: A Study on Quercetin Solid Forms. CRYSTAL GROWTH & DESIGN 2022; 22:6103-6113. [PMID: 36217418 PMCID: PMC9542717 DOI: 10.1021/acs.cgd.2c00707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 09/05/2022] [Indexed: 06/16/2023]
Abstract
The surface energy and surface chemistry of a crystal are of great importance when designing particles for a specific application, as these will impact both downstream manufacturing processes as well as final product quality. In this work, the surface properties of two different quercetin solvates (quercetin dihydrate and quercetin DMSO solvate) were studied using molecular (synthonic) modeling and experimental techniques, including inverse gas chromatography (IGC) and contact angle measurements, to establish a relationship between crystal structure and surface properties. The attachment energy model was used to predict morphologies and calculate surface properties through the study of their growth synthons. The modeling results confirmed the surface chemistry anisotropy for the two forms. For quercetin dihydrate, the {010} facets were found to grow mainly by nonpolar offset quercetin-quercetin stacking interactions, thus being hydrophobic, while the {100} facets were expected to be hydrophilic, growing by a polar quercetin-water hydrogen bond. For QDMSO, the dominant facet {002} grows by a strong polar quercetin-quercetin hydrogen bonding interaction, while the second most dominant facet {011} grows by nonpolar π-π stacking interactions. Water contact angle measurements and IGC confirmed a greater overall surface hydrophilicity for QDMSO compared to QDH and demonstrated surface energy heterogeneity for both structures. This work shows how synthonic modeling can help in the prediction of the surface nature of crystalline particles and guide the choice of parameters that will determine the optimal crystal form and final morphology for targeted surface properties, for example, the choice of crystallization conditions, choice of solvent, or presence of additives or impurities, which can direct the crystallization of a specific crystal form or crystal shape.
Collapse
Affiliation(s)
- Panayiotis Klitou
- School
of Food Science and Nutrition, Food Colloids and Bioprocessing Group, University of Leeds, Woodhouse Ln., Woodhouse, LeedsLS2 9JT, United Kingdom
| | - Ian Rosbottom
- Department
of Chemical Engineering, Imperial College
London, Imperial College Rd, South Kensington, LondonSW7 2AZ, United Kingdom
| | - Vikram Karde
- Department
of Chemical Engineering, Imperial College
London, Imperial College Rd, South Kensington, LondonSW7 2AZ, United Kingdom
| | - Jerry Y.Y. Heng
- Department
of Chemical Engineering, Imperial College
London, Imperial College Rd, South Kensington, LondonSW7 2AZ, United Kingdom
| | - Elena Simone
- School
of Food Science and Nutrition, Food Colloids and Bioprocessing Group, University of Leeds, Woodhouse Ln., Woodhouse, LeedsLS2 9JT, United Kingdom
- Department
of Applied Science and Technology, Politecnico
di Torino, Corso Duca degli Abruzzi, 24, 10129TorinoTO, Italy
| |
Collapse
|
9
|
Turner TD, Dawson N, Edwards M, Pickering JH, Hammond RB, Docherty R, Roberts KJ. A Digital Mechanistic Workflow for Predicting Solvent-Mediated Crystal Morphology: The α and β Forms of l-Glutamic Acid. CRYSTAL GROWTH & DESIGN 2022; 22:3042-3059. [PMID: 35529067 PMCID: PMC9073950 DOI: 10.1021/acs.cgd.1c01490] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 03/31/2022] [Indexed: 06/13/2023]
Abstract
The solvent-mediated crystal morphologies of the α and β polymorphic forms of l-glutamic acid are presented. This work applies a digital mechanistically based workflow that encompasses calculation of the crystal lattice energy and its constituent intermolecular synthons, their interaction energies, and their key role in understanding and predicting crystal morphology as well as assessing the surface chemistry, topology, and solvent binding on crystal habit growth surfaces. Through a comparison between the contrasting morphologies of the conformational polymorphs of l-glutamic acid, this approach highlights how the interfacial chemistry of organic crystalline materials and their inherent anisotropic interactions with their solvation environments direct their crystal habit with potential impact on their further downstream processing behavior.
Collapse
Affiliation(s)
- Thomas D. Turner
- Centre
for the Digital Design of Drug Products, School of Chemical and Process
Engineering, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, U.K.
| | - Neil Dawson
- Pfizer
R&D Ltd, Ramsgate
Road, Sandwich, Kent CT13 9NJ, U.K.
| | - Martin Edwards
- Britest
Limited, Keckwick Lane, Daresbury, Warrington WA4 4FS, U.K.
| | - Jonathan H. Pickering
- Centre
for the Digital Design of Drug Products, School of Chemical and Process
Engineering, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, U.K.
| | - Robert B. Hammond
- Centre
for the Digital Design of Drug Products, School of Chemical and Process
Engineering, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, U.K.
| | - Robert Docherty
- Pfizer
R&D Ltd, Ramsgate
Road, Sandwich, Kent CT13 9NJ, U.K.
| | - Kevin J. Roberts
- Centre
for the Digital Design of Drug Products, School of Chemical and Process
Engineering, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, U.K.
| |
Collapse
|
10
|
Varun N, Dutta A, Ghoroi C. Influence of surface interaction between drug and excipient in binary mixture for dry powder inhaler applications. ADV POWDER TECHNOL 2022. [DOI: 10.1016/j.apt.2022.103443] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
11
|
Rosbottom I, Turner TD, Ma CY, Hammond R, Roberts KJ, Yong C, Todorov I. The Structural Pathway from its Solvated Molecular State to the Solution Crystallisation of the α- and β-Polymorphic Forms of Para Amino Benzoic Acid. Faraday Discuss 2022; 235:467-489. [DOI: 10.1039/d1fd00112d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Para amino benzoic acid has two well-characterised polymorphic forms and, whilst both crystallise in the monoclinic space group, they have quite different crystal chemistry and crystallisability behaviour. The molecular conformation...
Collapse
|
12
|
Rizvi AK, Roberts KJ, Izumi T. The Influence of Supersaturation and the Presence of Biuret on the Nucleation, Growth and Morphology of Urea Crystallised from Ethanolic Solutions. Isr J Chem 2021. [DOI: 10.1002/ijch.202100089] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Aatika K. Rizvi
- EPSRC Centre for Doctoral Training in Biopharmaceutical Bioprocessing School of Engineering Newcastle University Newcastle Upon Tyne NE1 7RU UK
- EPSRC Centre for Doctoral Training in Complex Particulate Products and Processes School of Process and Chemical Engineering University of Leeds Leeds LS2 9JT UK
- Pfizer Global Research and Development Ramsgate Road Sandwich Kent CT13 9NJ UK
- Syngenta, Jealott's Hill International Research Centre Warfield Bracknell RG42 6EY UK
| | - Kevin J. Roberts
- EPSRC Centre for Doctoral Training in Complex Particulate Products and Processes School of Process and Chemical Engineering University of Leeds Leeds LS2 9JT UK
| | - Toshiko Izumi
- Pfizer Global Research and Development Ramsgate Road Sandwich Kent CT13 9NJ UK
| |
Collapse
|
13
|
Molecular, Solid-State and Surface Structures of the Conformational Polymorphic Forms of Ritonavir in Relation to their Physicochemical Properties. Pharm Res 2021; 38:971-990. [PMID: 34009625 PMCID: PMC8217055 DOI: 10.1007/s11095-021-03048-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 04/26/2021] [Indexed: 02/03/2023]
Abstract
Purpose Application of multi-scale modelling workflows to characterise polymorphism in ritonavir with regard to its stability, bioavailability and processing. Methods Molecular conformation, polarizability and stability are examined using quantum mechanics (QM). Intermolecular synthons, hydrogen bonding, crystal morphology and surface chemistry are modelled using empirical force fields. Results The form I conformation is more stable and polarized with more efficient intermolecular packing, lower void space and higher density, however its shielded hydroxyl is only a hydrogen bond donor. In contrast, the hydroxyl in the more open but less stable and polarized form II conformation is both a donor and acceptor resulting in stronger hydrogen bonding and a more stable crystal structure but one that is less dense. Both forms have strong 1D networks of hydrogen bonds and the differences in packing energies are partially offset in form II by its conformational deformation energy difference with respect to form I. The lattice energies converge at shorter distances for form I, consistent with its preferential crystallization at high supersaturation. Both forms exhibit a needle/lath-like crystal habit with slower growing hydrophobic side and faster growing hydrophilic capping habit faces with aspect ratios increasing from polar-protic, polar-aprotic and non-polar solvents, respectively. Surface energies are higher for form II than form I and increase with solvent polarity. The higher deformation, lattice and surface energies of form II are consistent with its lower solubility and hence bioavailability. Conclusion Inter-relationship between molecular, solid-state and surface structures of the polymorphic forms of ritonavir are quantified in relation to their physical-chemical properties. Supplementary Information The online version contains supplementary material available at 10.1007/s11095-021-03048-2.
Collapse
|
14
|
Liu H, Nie J, Stephen Chan HC, Zhang H, Li L, Lin H, Tong HHY, Ma A, Zhou Z. Phase solubility diagrams and energy surface calculations support the solubility enhancement with low hygroscopicity of Bergenin: 4-Aminobenzamide (1: 1) cocrystal. Int J Pharm 2021; 601:120537. [PMID: 33781883 DOI: 10.1016/j.ijpharm.2021.120537] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 03/08/2021] [Accepted: 03/22/2021] [Indexed: 01/22/2023]
Abstract
Herein, we reported a new bergenin: 4-aminobenzamide (BGN-4AM) cocrystal with significantly enhanced solubility and low hygroscopicity probed from two aspects such as phase solubility diagrams and theoretical calculations. Compared with anhydrous BGN, BGN-4AM solubilities in water and different buffer solutions (pH = 1.2, 4.5, 6.8) increase significantly. It is noted that BGN-4AM solubility in pH = 6.8 buffer solution presents 32.7 times higher than anhydrous BGN. Interestingly, BGN-4AM (0.31 ± 0.07%) showcases lower hygroscopicity than anhydrous BGN (9.31 ± 0.16%). The predicted and experimental solubilities agree with each other when considering solubility product (Ksp) and solution binding constant (K11) in phase solubility diagrams, indicating the solution complexes formation occurs. Further crystal surface-water interactions and Bravais, Friedel, Donnay-Harker (BFDH) analyses based on Density Functional Theory with dispersion correction (DFT-d) methods support the enhanced solubility. The water probe demonstrates an average interaction energy of -6.48 kcal/mol on the 002 plane of BGN-4AM, and only -5.47 kcal/mol on the 011 plane of BGN monohydrate. The lower lattice energy of BGN-4AM guarantees its lower hygroscopicity than BGN monohydrate. BGN-4AM with enhanced solubility and low hygroscopicity can be a potential candidate for further formulation development.
Collapse
Affiliation(s)
- Hongji Liu
- Department of Hygiene Inspection & Quarantine Science, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong 510515, China
| | - Jinju Nie
- Yantai Key Laboratory of Nanomedicine & Advanced Preparations, Yantai Institute of Materia Medica, Shandong, 264000, China
| | - H C Stephen Chan
- Research Center for Computer-Aided Drug Discovery, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Hailu Zhang
- Laboratory of Magnetic Resonance Spectroscopy and Imaging, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
| | - Liang Li
- Department of Forensic Toxicological Analysis, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, Guangdong 510080, China
| | - Hongqing Lin
- Department of Hygiene Inspection & Quarantine Science, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong 510515, China
| | - Henry H Y Tong
- School of Health Sciences, Macao Polytechnic Institute, Macao, China
| | - Ande Ma
- Department of Hygiene Inspection & Quarantine Science, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong 510515, China
| | - Zhengzheng Zhou
- Department of Hygiene Inspection & Quarantine Science, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, Guangdong 510515, China.
| |
Collapse
|
15
|
Effect of USP induction ports and modified glass sampling apparatus on aerosolization performance of lactose carrier-based fluticasone propionate dry powder inhaler. J Drug Deliv Sci Technol 2020. [DOI: 10.1016/j.jddst.2020.101794] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
16
|
Exploring the impact of extrinsic lactose fines, a USP modified sampling device and modified centrifuge tube on the delivered dose uniformity and drug detachment performance of a fluticasone propionate dry powder inhaler. J Drug Deliv Sci Technol 2020. [DOI: 10.1016/j.jddst.2020.101681] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
17
|
Rosbottom I, Pickering JH, Hammond RB, Roberts KJ. A Digital Workflow Supporting the Selection of Solvents for Optimizing the Crystallizability of p-Aminobenzoic Acid. Org Process Res Dev 2020. [DOI: 10.1021/acs.oprd.9b00261] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ian Rosbottom
- Centre for the Digital Design of Drug Products, School of Chemical and Process Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K
| | - Jonathan H. Pickering
- Centre for the Digital Design of Drug Products, School of Chemical and Process Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K
| | - Robert B. Hammond
- Centre for the Digital Design of Drug Products, School of Chemical and Process Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K
| | - Kevin J. Roberts
- Centre for the Digital Design of Drug Products, School of Chemical and Process Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K
| |
Collapse
|
18
|
|
19
|
Nguyen TTH, Hammond RB, Styliari ID, Murnane D, Roberts KJ. A digital workflow from crystallographic structure to single crystal particle attributes for predicting the formulation properties of terbutaline sulfate. CrystEngComm 2020. [DOI: 10.1039/d0ce00026d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A detailed inter-molecular (synthonic) analysis of terbutaline sulfate, an ionic addition salt for inhalation drug formulation, is related to its crystal morphology, the surface chemistry of the habit faces and hence to its crystal surface energy.
Collapse
Affiliation(s)
- Thai T. H. Nguyen
- Centre for the Digital Design of Drug Products
- School of Chemical and Process Engineering
- University of Leeds
- Leeds
- UK
| | - Robert B. Hammond
- Centre for the Digital Design of Drug Products
- School of Chemical and Process Engineering
- University of Leeds
- Leeds
- UK
| | | | - Darragh Murnane
- School of Life and Medical Sciences
- University of Hertfordshire
- UK
| | - Kevin J. Roberts
- Centre for the Digital Design of Drug Products
- School of Chemical and Process Engineering
- University of Leeds
- Leeds
- UK
| |
Collapse
|
20
|
Mohylyuk V, Styliari ID, Novykov D, Pikett R, Dattani R. Assessment of the effect of Cellets’ particle size on the flow in a Wurster fluid-bed coater via powder rheology. J Drug Deliv Sci Technol 2019. [DOI: 10.1016/j.jddst.2019.101320] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
21
|
Maretti E, Costantino L, Buttini F, Rustichelli C, Leo E, Truzzi E, Iannuccelli V. Newly synthesized surfactants for surface mannosylation of respirable SLN assemblies to target macrophages in tuberculosis therapy. Drug Deliv Transl Res 2019; 9:298-310. [PMID: 30484257 DOI: 10.1007/s13346-018-00607-w] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The present study reports about new solid lipid nanoparticle assemblies (SLNas) loaded with rifampicin (RIF) surface-decorated with novel mannose derivatives, designed for anti-tuberculosis (TB) inhaled therapy by dry powder inhaler (DPI). Mannose is considered a relevant ligand to achieve active drug targeting being mannose receptors (MR) overexpressed on membranes of infected alveolar macrophages (AM), which are the preferred site of Mycobacterium tuberculosis. Surface decoration of SLNas was obtained by means of newly synthesized functionalizing compounds used as surfactants in the preparation of carriers. SLNas were fully characterized in vitro determining size, morphology, drug loading, drug release, surface mannosylation, cytotoxicity, macrophage internalization extent and ability to bind MR, and intracellular RIF concentration. Moreover, the influence of these new surface functionalizing agents on SLNas aerodynamic performance was assessed by measuring particle respirability features using next generation impactor. SLNas exhibited suitable drug payload, in vitro release, and more efficient ability to enter macrophages (about 80%) compared to bare RIF (about 20%) and to non-functionalized SLNas (about 40%). The involvement of MR-specific binding has been demonstrated by saturating MR of J774 cells causing a decrease of RIF intracellular concentration of about 40%. Furthermore, it is noteworthy that the surface decoration of particles produced a poor cohesive powder with an adequate respirability (fine particle fraction ranging from about 30 to 50%). Therefore, the proposed SLNas may represent an encouraging opportunity in a perspective of an efficacious anti-TB inhaled therapy.
Collapse
Affiliation(s)
- Eleonora Maretti
- Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italy
| | - Luca Costantino
- Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italy
| | - Francesca Buttini
- Food and Drug Department, University of Parma, Parco Area delle Scienze 27/A, 43124, Parma, Italy
| | - Cecilia Rustichelli
- Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italy
| | - Eliana Leo
- Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italy
| | - Eleonora Truzzi
- Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italy
| | - Valentina Iannuccelli
- Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italy.
| |
Collapse
|
22
|
Rosbottom I, Yong CW, Geatches DL, Hammond RB, Todorov IT, Roberts KJ. The integrated DL_POLY/DL_FIELD/DL_ANALYSER software platform for molecular dynamics simulations for exploration of the synthonic interactions in saturated benzoic acid/hexane solutions. MOLECULAR SIMULATION 2019. [DOI: 10.1080/08927022.2018.1560441] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- I. Rosbottom
- Centre for Digital Design of Drug Products, School of Chemical and Process Engineering, University of Leeds, Leeds, UK
| | - C. W. Yong
- Scientific Computing Department, Science and Technology Facilities Council, Daresbury Laboratory, Warrington, UK
- Manchester Pharmacy School, Faculty of Medical and Human Sciences, University of Manchester, Manchester, UK
| | - D. L. Geatches
- Scientific Computing Department, Science and Technology Facilities Council, Daresbury Laboratory, Warrington, UK
| | - R. B. Hammond
- Centre for Digital Design of Drug Products, School of Chemical and Process Engineering, University of Leeds, Leeds, UK
| | - I. T. Todorov
- Scientific Computing Department, Science and Technology Facilities Council, Daresbury Laboratory, Warrington, UK
| | - K. J. Roberts
- Centre for Digital Design of Drug Products, School of Chemical and Process Engineering, University of Leeds, Leeds, UK
| |
Collapse
|
23
|
Habit Modification of the Active Pharmaceutical Ingredient Lovastatin Through a Predictive Solvent Selection Approach. J Pharm Sci 2018; 108:1779-1787. [PMID: 30590015 DOI: 10.1016/j.xphs.2018.12.012] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 11/28/2018] [Accepted: 12/13/2018] [Indexed: 01/11/2023]
Abstract
An analysis of the important intermolecular interactions of the active pharmaceutical ingredient lovastatin which contribute to the surface chemistry and attachment energy morphology is presented. The analysis is supported by a recent redetermination of the single-crystal structure (orthorhombic space group P212121) and targets the understanding and potential control of the morphology of lovastatin, which tends to crystallize in a needle-like morphology, where the aspect ratio varies depending on the nature of the solvent. The lattice energy was calculated to be -38.79 kcal mol-1 with a small contribution of -2.73 kcal mol-1 from electrostatic interactions. The lattice structure is significantly stabilized by the hexahydronaphthalene ring of the molecule, which contributes 43.39% of the lattice energy. Synthon analysis shows that the dominant intermolecular interaction within the lattice structure of lovastatin is found to be along the a crystallographic axis, associated with a dispersive stacking interaction due to the close packing of 2 hexahydronaphthalene rings resulting in a total interaction energy of -6.46 kcal mol-1. The attachment energy morphology correlates well with the observed crystal morphology which exhibits a needle-like habit dominated by {0 1 1}, {0 2 0}, {0 0 2}, and {1 0 1} crystal forms. The needle capping faces are found to contain the short stacks of hexahydronaphthalene rings where the strong intermolecular synthon is found to contribute positively to the attachment energy and hence growth at this surface. This dominant intermolecular synthon is concluded to be the major cause of enhanced growth along the crystallographic a axis leading to the formation of a needle-like morphology. A habit modification strategy is discussed which uses recrystallization from apolar solvents to reduce the effective growth rate at the needle-capping surfaces. This is supported through experimental data which shows that crystals obtained from crystallization in hexane and methyl-cyclohexane have significantly reduced aspect ratios in comparison to those grown from the more polar methanol and ethyl acetate solutions. Crystals obtained from nitromethane solutions were also found to have a very large reduction in aspect ratio to a prismatic morphology reflecting this solvent's propensity to interact with hydrophobic surfaces, critically with no polymorph change.
Collapse
|
24
|
Rosbottom I, Pickering JH, Etbon B, Hammond RB, Roberts KJ. Examination of inequivalent wetting on the crystal habit surfaces of RS-ibuprofen using grid-based molecular modelling. Phys Chem Chem Phys 2018; 20:11622-11633. [PMID: 29662981 DOI: 10.1039/c7cp08354h] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthonic engineering tools, including grid-based searching molecular modelling, are applied to investigate the wetting interactions of the solute and four crystallisation solvents (ethanol, ethyl acetate, acetonitrile and toluene) with the {100}, {001} and {011} forms of RS-ibuprofen. The grid-based methods, in particular the construction of a crystal slab parallel to a given plane in a coordinate system with one axis perpendicular to the surface, are defined in detail. The interaction strengths and nature (dispersive, hydrogen bonding (H-bonding) or coulombic forces) are related to the crystal growth rates and morphologies. The solute is found to interact strongest with the capping {011}, then the side {001} and weakest with the top {100} habit surfaces. The solute interactions with the {100} and {001} surfaces are found to be almost solely dominated by dispersive force contributions, whilst the same with the {011} surfaces are found to have a greater contribution from H-bonding and coulombic forces. The increased surface rugosity, at the molecular level of the {011} surfaces, results in a favourable docking site in a surface 'valley', not present in the {100} and {001} surfaces. The H-bonding solvents ethanol, acetonitrile and ethyl acetate are found to strongly interact with the {011} surfaces and weakly with the {001} surfaces, with the {011} interactions having a much greater contribution from H-bonding and coulombic forces. The interaction energies of the apolar and aprotic solvent toluene, with the {011} and {001} surfaces, are found to be very close. Toluene is found having slightly stronger interactions with the {001} than the {011} surfaces, which are all dominated by dispersive interactions. The ratio of the average energy of the top 100 solvent interactions with the {001} surface divided by the average energy of the top 100 interactions with the {011} surface is compared to the ratio of the experimentally measured growth rates of the same forms. In general, the interaction energy ratio is found to have an inverse ratio with the growth rates, implying that the solvents which are calculated to interact strongly with a particular surface are impeding the growth of that surface and reducing the growth rate, in turn impacting upon the final morphology of the material.
Collapse
Affiliation(s)
- I Rosbottom
- Centre for the Digital Design of Drug Products, School of Chemical and Process Engineering, University of Leeds, LS2 9JT, UK
| | | | | | | | | |
Collapse
|
25
|
|
26
|
Moldovan AA, Rosbottom I, Ramachandran V, Pask CM, Olomukhoro O, Roberts KJ. Crystallographic Structure, Intermolecular Packing Energetics, Crystal Morphology and Surface Chemistry of Salmeterol Xinafoate (Form I). J Pharm Sci 2017; 106:882-891. [DOI: 10.1016/j.xphs.2016.11.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Revised: 10/19/2016] [Accepted: 11/11/2016] [Indexed: 10/20/2022]
|
27
|
Synthonic Engineering Modelling Tools for Product and Process Design. ENGINEERING CRYSTALLOGRAPHY: FROM MOLECULE TO CRYSTAL TO FUNCTIONAL FORM 2017. [DOI: 10.1007/978-94-024-1117-1_10] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
28
|
Barata TS, Zhang C, Dalby PA, Brocchini S, Zloh M. Identification of Protein-Excipient Interaction Hotspots Using Computational Approaches. Int J Mol Sci 2016; 17:ijms17060853. [PMID: 27258262 PMCID: PMC4926387 DOI: 10.3390/ijms17060853] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 04/12/2016] [Accepted: 05/24/2016] [Indexed: 01/30/2023] Open
Abstract
Protein formulation development relies on the selection of excipients that inhibit protein–protein interactions preventing aggregation. Empirical strategies involve screening many excipient and buffer combinations using force degradation studies. Such methods do not readily provide information on intermolecular interactions responsible for the protective effects of excipients. This study describes a molecular docking approach to screen and rank interactions allowing for the identification of protein–excipient hotspots to aid in the selection of excipients to be experimentally screened. Previously published work with Drosophila Su(dx) was used to develop and validate the computational methodology, which was then used to determine the formulation hotspots for Fab A33. Commonly used excipients were examined and compared to the regions in Fab A33 prone to protein–protein interactions that could lead to aggregation. This approach could provide information on a molecular level about the protective interactions of excipients in protein formulations to aid the more rational development of future formulations.
Collapse
Affiliation(s)
- Teresa S Barata
- EPSRC Centre for Innovative Manufacturing in Emergent Macromolecular Therapies, University College London, Biochemical Engineering Department, Bernard Katz Building, Gordon Street, London WC1H 0AH, UK.
- UCL School of Pharmacy, Department of Pharmaceutics, 29-39 Brunswick Square, London WC1N 1AX, UK.
| | - Cheng Zhang
- EPSRC Centre for Innovative Manufacturing in Emergent Macromolecular Therapies, University College London, Biochemical Engineering Department, Bernard Katz Building, Gordon Street, London WC1H 0AH, UK.
| | - Paul A Dalby
- EPSRC Centre for Innovative Manufacturing in Emergent Macromolecular Therapies, University College London, Biochemical Engineering Department, Bernard Katz Building, Gordon Street, London WC1H 0AH, UK.
| | - Steve Brocchini
- EPSRC Centre for Innovative Manufacturing in Emergent Macromolecular Therapies, University College London, Biochemical Engineering Department, Bernard Katz Building, Gordon Street, London WC1H 0AH, UK.
- UCL School of Pharmacy, Department of Pharmaceutics, 29-39 Brunswick Square, London WC1N 1AX, UK.
| | - Mire Zloh
- Department of Pharmacy, Pharmacology and Postgraduate Medicine, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK.
| |
Collapse
|
29
|
Muddle J, Murnane D, Parisini I, Brown M, Page C, Forbes B. Interaction of Formulation and Device Factors Determine the In Vitro Performance of Salbutamol Sulphate Dry Powders for Inhalation. J Pharm Sci 2015. [DOI: 10.1002/jps.24599] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
30
|
Rosbottom I, Roberts KJ, Docherty R. The solid state, surface and morphological properties of p-aminobenzoic acid in terms of the strength and directionality of its intermolecular synthons. CrystEngComm 2015. [DOI: 10.1039/c5ce00302d] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The lattice energy and crystal morphologies of the α and β forms of p-aminobenzoic acid are correlated to experimentally grown crystals by calculating their strength, directionality and chemical state of their bulk (intrinsic) and surface (extrinsic) synthons.
Collapse
Affiliation(s)
- I. Rosbottom
- Institute of Particle Science and Engineering Institute for Process, Research and Development
- School of Chemical and Process Engineering
- University of Leeds
- Leeds, England
| | - K. J. Roberts
- Institute of Particle Science and Engineering Institute for Process, Research and Development
- School of Chemical and Process Engineering
- University of Leeds
- Leeds, England
| | - R. Docherty
- Pfizer Global Research & Development
- Pharmaceutical R & D (IPC 612)
- , England
| |
Collapse
|