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Salústio PJ, Amaral MH, Costa PC. Different Carriers for Use in Dry Powder Inhalers: Characteristics of Their Particles. J Aerosol Med Pulm Drug Deliv 2024. [PMID: 39120712 DOI: 10.1089/jamp.2023.0029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/10/2024] Open
Abstract
In contemporary times, there has been a rise in the utilization of dry powder inhalers (DPIs) in the management of pulmonary and systemic diseases. These devices underwent a swift advancement in terms of both the equipment utilized and the formulation process. In this review, the carrier physicochemical characteristics that influence DPI performance are discussed, focusing its shape, morphology, size distribution, texture, aerodynamic diameter, density, moisture, adhesive and detachment forces between particles, fine carrier particles, and dry powder aerosolization. To promote the deposition of the active principal ingredient deep within the pulmonary system, advancements have been made in enhancing these factors and surface properties through the application of novel technologies that encompass particle engineering. So far, the most used carrier is lactose showing some advantages and disadvantages, but other substances and systems are being studied with the intention of replacing it. The final objective of this review is to analyze the physicochemical and mechanical characteristics of the different carriers or new delivery systems used in DPI formulations, whether already on the market or still under investigation. [Figure: see text].
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Affiliation(s)
- P J Salústio
- Research Institute for Medicines (iMed.UL), Faculty of Pharmacy, Universidade de Lisboa, Lisboa, Portugal
| | - M H Amaral
- UCIBIO-Applied Molecular Biosciences Unit, MedTech-Laboratory of Pharmaceutical Technology, Faculty of Pharmacy, University of Porto, Porto, Portugal
- Associate Laboratory i4HB-Institute for Health and Bioeconomy, Faculty of Pharmacy, University of Porto, Porto, Portugal
| | - P C Costa
- UCIBIO-Applied Molecular Biosciences Unit, MedTech-Laboratory of Pharmaceutical Technology, Faculty of Pharmacy, University of Porto, Porto, Portugal
- Associate Laboratory i4HB-Institute for Health and Bioeconomy, Faculty of Pharmacy, University of Porto, Porto, Portugal
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2
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Arevalo F, Tignor S, Brunskill A, Goodey A. Using Dry Dispersion Laser Diffraction to Assess Dispersibility in Spheronized Agglomerate Formulations. AAPS PharmSciTech 2024; 25:45. [PMID: 38396188 DOI: 10.1208/s12249-024-02743-8] [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: 10/20/2023] [Accepted: 01/08/2024] [Indexed: 02/25/2024] Open
Abstract
In this study, dry dispersion laser diffraction was used to study the dispersibility of spheronized agglomerate formulations and identify geometric particle size metrics that correlated well with aerodynamic particle size distribution (APSD). Eleven unique batches of agglomerates were prepared for both laser diffraction and cascade impaction testing. Correlations between the particle size distribution (PSD) and aerodynamic particle size distribution (APSD) metrics for the eleven agglomerate batches were determined in a semi-empirical manner. The strongest correlation between APSD and PSD was observed between the impactor-sized mass (%ISM) and the cumulative PSD fraction <14.5 µm. The strongest correlation with fine particle fraction (FPF) was observed with the cumulative PSD fraction <0.99 micron (R-squared = 0.974). In contrast to the other APSD metrics, good correlations were not found between the mass median aerodynamic diameter (MMAD) and the cumulative PSD fractions. Overall, the implementation of laser diffraction as a surrogate for cascade impaction has the potential to streamline product development. Laser diffraction measurements offer savings in labor and turnaround time compared to cascade impaction.
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Affiliation(s)
- Faustin Arevalo
- Merck & Co., Inc., Sterile and Specialty Products, Rahway, New Jersey, USA.
| | - Steven Tignor
- Merck & Co., Inc., Small Molecule Analytical Research and Development, Rahway, New Jersey, USA
| | - Andrew Brunskill
- Merck & Co., Inc., Materials & Biophysical Characterization, Rahway, New Jersey, USA
| | - Adrian Goodey
- Merck & Co., Inc., Small Molecule Analytical Research and Development, Rahway, New Jersey, USA
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4
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Park H, Ha ES, Kim MS. Physicochemical analysis techniques specialized in surface characterization of inhalable dry powders. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2021. [DOI: 10.1007/s40005-021-00526-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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5
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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.
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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
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6
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Hadiwinoto GD, Kwok PCL, Tong HHY, Wong SN, Chow SF, Lakerveld R. Integrated Continuous Plug-Flow Crystallization and Spray Drying of Pharmaceuticals for Dry Powder Inhalation. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b01730] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Gabriela Daisy Hadiwinoto
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Philip C. L. Kwok
- Sydney Pharmacy School, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Henry H. Y. Tong
- School of Health Sciences, Macao Polytechnic Institute, R. de Luis Gonzaga Gomes, Macau, China
| | - Si Nga Wong
- Department of Pharmacology and Pharmacy, The University of Hong Kong, 21 Sassoon Road, Pokfulam, Hong Kong
| | - Shing Fung Chow
- Department of Pharmacology and Pharmacy, The University of Hong Kong, 21 Sassoon Road, Pokfulam, Hong Kong
| | - Richard Lakerveld
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
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Školáková T, Souchová L, Patera J, Pultar M, Školáková A, Zámostný P. Prediction of drug-polymer interactions in binary mixtures using energy balance supported by inverse gas chromatography. Eur J Pharm Sci 2019; 130:247-259. [DOI: 10.1016/j.ejps.2019.01.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 01/17/2019] [Accepted: 01/20/2019] [Indexed: 11/30/2022]
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8
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Devalapalli MMR, Cheruvu HS, Yertha T, Veeravalli VB, Sampathi S, Shivakumar S. Hansen solubility parameters for assay method optimization of simvastatin, ramipril, atenolol, hydrochlorothiazide and aspirin in human plasma using liquid chromatography with tandem mass spectrometry. J Sep Sci 2017; 40:3662-3674. [PMID: 28722356 DOI: 10.1002/jssc.201700565] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2017] [Revised: 07/12/2017] [Accepted: 07/12/2017] [Indexed: 11/07/2022]
Abstract
A simple, specific, sensitive, validated method was developed using liquid chromatography with tandem mass spectrometry with electrospray ionization of human plasma for the simultaneous estimation of drugs (simvastatin, ramipril, atenolol, hydrochlorothiazide, and aspirin) of PolycapTM capsule used in cardiovascular therapy. The interaction of these actives including internal standards between the stationary and mobile phase were investigated using Hansen solubility parameters. Chromatographic separation was performed on Phenomenex Synergi Polar-RP (30 × 2 mm, 4 μm) column with a gradient mobile phase composition of acetonitrile and 5 mM ammonium formate for positive mode and 0.1% formic acid in both water and acetonitrile for negative mode. The flow rate and runtime were 1.0 mL/min and 3.5 min, respectively. Sample extraction was done by protein precipitation using acetonitrile, enabling a fast analysis. The calibration ranges from 0.1 to 100, 0.1 to 100, and 1 to 1000 ng/mL for simvastatin, ramipril, and atenolol using internal standard carbamazepine in positive mode, respectively, whereas it was 0.3-300 and 2-2000 ng/mL for hydrochlorothiazide and aspirin using internal standard 7-hydroxy coumarin in negative mode, respectively. Hansen solubility parameters can be used as a high-throughput optimizing tool for column and mobile phase selection in bioanalysis. This validated bioanalytical method has the potential for future fixed dose combination based preclinical and clinical studies that can save analysis time.
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Affiliation(s)
| | - Hanumanth Srikanth Cheruvu
- Biology Division, DMPK Laboratory, GVKBIO, Hyderabad, India.,Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research, Hyderabad, India
| | | | | | - Sunitha Sampathi
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research, Hyderabad, India
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9
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Sarkar S, Minatovicz B, Thalberg K, Chaudhuri B. Mechanistic investigation of mixing and segregation of ordered mixtures: experiments and numerical simulations. Drug Dev Ind Pharm 2017; 43:1677-1685. [PMID: 28574733 DOI: 10.1080/03639045.2017.1338719] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Pulmonary delivery of cohesive and micronized drugs through dry powder inhalers (DPIs) is traditionally achieved through the formation of ordered mixtures. In order to improve the mechanistic understanding of formation of ordered mixtures, the system consisting of micronized lactose (AZFL, representative of an active pharmaceutical ingredient) and a coarse particle carrier (LH100) is investigated as a function of different process and material variables in a high shear mixer (HSM) and in a low shear double cone (DCN) blender, using both experimental and numerical methods. Process insight is developed using a Discrete Element Method (DEM) based numerical model which could predict the formation of ordered mixtures in the two blenders and was verified against experimental determinations. Spatial and temporal evolution of granular flow are visualized and quantified in silico to reveal distinguishing features of both blenders to aid in rational selection of blenders and process parameters.
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Affiliation(s)
- Saurabh Sarkar
- a Department of Pharmaceutical Sciences , University of Connecticut , Storrs , CT , USA
| | - Bruna Minatovicz
- a Department of Pharmaceutical Sciences , University of Connecticut , Storrs , CT , USA
| | - Kyrre Thalberg
- b Astra Zeneca, Research & Development , Mölndal , Sweden
| | - Bodhisattwa Chaudhuri
- a Department of Pharmaceutical Sciences , University of Connecticut , Storrs , CT , USA.,c Institute of Materials Science, University of Connecticut , Storrs , CT , USA
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10
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Evaluation of Granulated Lactose as a Carrier for Dry Powder Inhaler Formulations 2: Effect of Drugs and Drug Loading. J Pharm Sci 2017; 106:366-376. [DOI: 10.1016/j.xphs.2016.09.035] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 08/06/2016] [Accepted: 09/01/2016] [Indexed: 11/22/2022]
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11
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Jones MD, Buckton G. Comparison of the cohesion-adhesion balance approach to colloidal probe atomic force microscopy and the measurement of Hansen partial solubility parameters by inverse gas chromatography for the prediction of dry powder inhalation performance. Int J Pharm 2016; 509:419-430. [PMID: 27265314 DOI: 10.1016/j.ijpharm.2016.06.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Revised: 05/20/2016] [Accepted: 06/01/2016] [Indexed: 10/21/2022]
Abstract
The abilities of the cohesive-adhesive balance approach to atomic force microscopy (AFM) and the measurement of Hansen partial solubility parameters by inverse gas chromatography (IGC) to predict the performance of carrier-based dry powder inhaler (DPI) formulations were compared. Five model drugs (beclometasone dipropionate, budesonide, salbutamol sulphate, terbutaline sulphate and triamcinolone acetonide) and three model carriers (erythritol, α-lactose monohydrate and d-mannitol) were chosen, giving fifteen drug-carrier combinations. Comparison of the AFM and IGC interparticulate adhesion data suggested that they did not produce equivalent results. Comparison of the AFM data with the in vitro fine particle delivery of appropriate DPI formulations normalised to account for particle size differences revealed a previously observed pattern for the AFM measurements, with a slightly cohesive AFM CAB ratio being associated with the highest fine particle fraction. However, no consistent relationship between formulation performance and the IGC data was observed. The results as a whole highlight the complexity of the many interacting variables that can affect the behaviour of DPIs and suggest that the prediction of their performance from a single measurement is unlikely to be successful in every case.
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Affiliation(s)
- Matthew D Jones
- Department of Pharmaceutics, UCL School of Pharmacy, 29-39 Brunswick Square, London, WC1N 1AX, United Kingdom; Department of Pharmacy and Pharmacology, University of Bath, Bath, BA2 7AY, United Kingdom.
| | - Graham Buckton
- Department of Pharmaceutics, UCL School of Pharmacy, 29-39 Brunswick Square, London, WC1N 1AX, United Kingdom.
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12
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Cares-Pacheco M, Calvet R, Vaca-Medina G, Rouilly A, Espitalier F. Inverse gas chromatography a tool to follow physicochemical modifications of pharmaceutical solids: Crystal habit and particles size surface effects. Int J Pharm 2015; 494:113-26. [DOI: 10.1016/j.ijpharm.2015.07.078] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 07/29/2015] [Accepted: 07/31/2015] [Indexed: 11/28/2022]
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13
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Evidence for the existence of powder sub-populations in micronized materials: aerodynamic size-fractions of aerosolized powders possess distinct physicochemical properties. Pharm Res 2015; 31:3251-64. [PMID: 25015552 PMCID: PMC4224749 DOI: 10.1007/s11095-014-1414-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Accepted: 05/06/2014] [Indexed: 11/29/2022]
Abstract
Purpose To investigate the agglomeration behaviour of the fine (<5.0 μm) and coarse (>12.8 μm) particle fractions of salmeterol xinafoate (SX) and fluticasone propionate (FP) by isolating aerodynamic size fractions and characterising their physicochemical and re-dispersal properties. Methods Aerodynamic fractionation was conducted using the Next Generation Impactor (NGI). Re-crystallized control particles, unfractionated and fractionated materials were characterized for particle size, morphology, crystallinity and surface energy. Re-dispersal of the particles was assessed using dry dispersion laser diffraction and NGI analysis. Results Aerosolized SX and FP particles deposited in the NGI as agglomerates of consistent particle/agglomerate morphology. SX particles depositing on Stages 3 and 5 had higher total surface energy than unfractionated SX, with Stage 5 particles showing the greatest surface energy heterogeneity. FP fractions had comparable surface energy distributions and bulk crystallinity but differences in surface chemistry. SX fractions demonstrated higher bulk disorder than unfractionated and re-crystallized particles. Upon aerosolization, the fractions differed in their intrinsic emission and dispersion into a fine particle fraction (<5.0 μm). Conclusions Micronized powders consisted of sub-populations of particles displaying distinct physicochemical and powder dispersal properties compared to the unfractionated bulk material. This may have implications for the efficiency of inhaled drug delivery.
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14
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Ticehurst MD, Marziano I. Integration of active pharmaceutical ingredient solid form selection and particle engineering into drug product design. J Pharm Pharmacol 2015; 67:782-802. [DOI: 10.1111/jphp.12375] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Accepted: 12/14/2014] [Indexed: 12/27/2022]
Abstract
Abstract
This review seeks to offer a broad perspective that encompasses an understanding of the drug product attributes affected by active pharmaceutical ingredient (API) physical properties, their link to solid form selection and the role of particle engineering. While the crucial role of active pharmaceutical ingredient (API) solid form selection is universally acknowledged in the pharmaceutical industry, the value of increasing effort to understanding the link between solid form, API physical properties and drug product formulation and manufacture is now also being recognised.
A truly holistic strategy for drug product development should focus on connecting solid form selection, particle engineering and formulation design to both exploit opportunities to access simpler manufacturing operations and prevent failures. Modelling and predictive tools that assist in establishing these links early in product development are discussed. In addition, the potential for differences between the ingoing API physical properties and those in the final product caused by drug product processing is considered. The focus of this review is on oral solid dosage forms and dry powder inhaler products for lung delivery.
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Affiliation(s)
- Martyn David Ticehurst
- Materials Science, Drug Product Design, Pharmaceutical Sciences, Worldwide R & D, Pfizer Ltd, Sandwich, Kent, UK
| | - Ivan Marziano
- Chemical R & D, Pharmaceutical Sciences, Worldwide R & D, Pfizer Ltd, Sandwich, Kent, UK
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15
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Ramachandran V, Murnane D, Hammond RB, Pickering J, Roberts KJ, Soufian M, Forbes B, Jaffari S, Martin GP, Collins E, Pencheva K. Formulation Pre-screening of Inhalation Powders Using Computational Atom–Atom Systematic Search Method. Mol Pharm 2014; 12:18-33. [DOI: 10.1021/mp500335w] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vasuki Ramachandran
- Institute
of Particle Science and Engineering, Institute of Process Research
and Development, School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, U.K
| | - Darragh Murnane
- School
of Life and Medical Sciences, University of Hertfordshire, Hertfordshire AL10 9AB, U.K
| | - Robert B. Hammond
- Institute
of Particle Science and Engineering, Institute of Process Research
and Development, School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, U.K
| | - Jonathan Pickering
- Institute
of Particle Science and Engineering, Institute of Process Research
and Development, School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, U.K
| | - Kevin J. Roberts
- Institute
of Particle Science and Engineering, Institute of Process Research
and Development, School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, U.K
| | - Majeed Soufian
- Institute
of Particle Science and Engineering, Institute of Process Research
and Development, School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, U.K
| | - Ben Forbes
- Institute
of Pharmaceutical Sciences, King’s College, London SE1 9NH, U.K
| | - Sara Jaffari
- Institute
of Pharmaceutical Sciences, King’s College, London SE1 9NH, U.K
| | - Gary P. Martin
- Institute
of Pharmaceutical Sciences, King’s College, London SE1 9NH, U.K
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Kawakami K, Hasegawa Y, Zhang S, Yoshihashi Y, Yonemochi E, Terada K. Low-density microparticles with petaloid surface structure for pulmonary drug delivery. J Pharm Sci 2014; 103:1309-13. [PMID: 24522880 DOI: 10.1002/jps.23899] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 01/20/2014] [Accepted: 01/22/2014] [Indexed: 01/24/2023]
Abstract
The morphology of spray-dried particles composed of psicose and hydroxypropyl methylcellulose was modified by adding ammonium bicarbonate (ABC) to the solution. The surface structure of the particles was altered by immediate transformation of ABC to gaseous components during the spray drying. As a result, low-density microparticles with a petaloid surface structure, which was controllable by changing the evaporation rate of ABC, was obtained. This technique should be useful for modifying characteristics of solid particles for pulmonary drug delivery.
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Affiliation(s)
- Kohsaku Kawakami
- Biomaterials Unit, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki, 305-0044, Japan
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17
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Alhalaweh A, Kaialy W, Buckton G, Gill H, Nokhodchi A, Velaga SP. Theophylline cocrystals prepared by spray drying: physicochemical properties and aerosolization performance. AAPS PharmSciTech 2013; 14:265-76. [PMID: 23297166 DOI: 10.1208/s12249-012-9883-3] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Accepted: 10/23/2012] [Indexed: 11/30/2022] Open
Abstract
The purpose of this work was to characterize theophylline (THF) cocrystals prepared by spray drying in terms of the physicochemical properties and inhalation performance when aerosolized from a dry powder inhaler. Cocrystals of theophylline with urea (THF-URE), saccharin (THF-SAC) and nicotinamide (THF-NIC) were prepared by spray drying. Milled THF and THF-SAC cocrystals were also used for comparison. The physical purity, particle size, particle morphology and surface energy of the materials were determined. The in vitro aerosol performance of the spray-dried cocrystals, drug-alone and a drug-carrier aerosol, was assessed. The spray-dried particles had different size distributions, morphologies and surface energies. The milled samples had higher surface energy than those prepared by spray drying. Good agreement was observed between multi-stage liquid impinger and next-generation impactor in terms of assessing spray-dried THF particles. The fine particle fractions of both formulations were similar for THF, but drug-alone formulations outperformed drug-carrier formulations for the THF cocrystals. The aerosolization performance of different THF cocrystals was within the following rank order as obtained from both drug-alone and drug-carrier formulations: THF-NIC>THF-URE>THF-SAC. It was proposed that micromeritic properties dominate over particle surface energy in terms of determining the aerosol performance of THF cocrystals. Spray drying could be a potential technique for preparing cocrystals with modified physical properties.
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18
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Rapid characterisation of the inherent dispersibility of respirable powders using dry dispersion laser diffraction. Int J Pharm 2013; 447:124-31. [PMID: 23434542 PMCID: PMC3636537 DOI: 10.1016/j.ijpharm.2013.02.034] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Revised: 02/07/2013] [Accepted: 02/08/2013] [Indexed: 11/22/2022]
Abstract
Understanding and controlling powder de-agglomeration is of great importance in the development of dry powder inhaler (DPI) products. Dry dispersion laser diffraction measures particle size readily under controlled dispersing conditions, but has not been exploited fully to characterise inherent powder dispersibility. The aim of the study was to utilise particle size-dispersing pressure titration curves to characterise powder cohesivity and ease of de-agglomeration. Seven inhaled drug/excipient powders (beclometasone dipropionate, budesonide, fluticasone propionate, lactohale 300, salbutamol base, salmeterol xinafoate and tofimilast) were subjected to a range of dispersing pressures (0.2-4.5 Bar) in the Sympatec HELOS/RODOS laser diffractometer and particle size measurements were recorded. Particle size-primary pressure data were used to determine the pressures required for complete de-agglomeration. The latter were employed as an index of the cohesive strength of the powder (critical primary pressure; CPP), and the curves were modelled empirically to derive the pressure required for 50% de-agglomeration (DA₅₀). The powders presented a range of CPP (1.0-3.5 Bar) and DA₅₀ (0.23-1.45 Bar) which appeared to be characteristic for different mechanisms of powder de-agglomeration. This approach has utility as a rapid pre-formulation tool to measure inherent powder dispersibility, in order to direct the development strategy of DPI products.
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Le V, Robins E, Flament M. Agglomerate behaviour of fluticasone propionate within dry powder inhaler formulations. Eur J Pharm Biopharm 2012; 80:596-603. [DOI: 10.1016/j.ejpb.2011.12.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Revised: 11/16/2011] [Accepted: 12/06/2011] [Indexed: 10/14/2022]
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20
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Kou X, Chan LW, Steckel H, Heng PW. Physico-chemical aspects of lactose for inhalation. Adv Drug Deliv Rev 2012; 64:220-32. [PMID: 22123598 DOI: 10.1016/j.addr.2011.11.004] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2010] [Revised: 06/11/2011] [Accepted: 11/09/2011] [Indexed: 10/15/2022]
Abstract
A dry powder inhaler (DPI) is a dosage form that consists of a powder formulation in a device which is designed to deliver an active ingredient to the respiratory tract. It has been extensively investigated over the past years and several aspects relating to device and particulate delivery mechanisms have been the focal points for debate. DPI formulations may or may not contain carrier particles but whenever a carrier is included in a commercial formulation, it is almost invariably lactose monohydrate. Many physicochemical properties of the lactose carrier particles have been reported to affect the efficiency of a DPI. A number of preparation methods have been developed which have been claimed to produce lactose carriers with characteristics which lead to improved deposition. Alongside these developments, a number of characterization methods have been developed which have been reported to be useful in the measurement of key properties of the particulate ingredients. This review describes the various physicochemical characteristics of lactose, methods of manufacturing lactose particulates and their characterization.
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Jones MD, Young P, Traini D. The use of inverse gas chromatography for the study of lactose and pharmaceutical materials used in dry powder inhalers. Adv Drug Deliv Rev 2012; 64:285-93. [PMID: 22265843 DOI: 10.1016/j.addr.2011.12.015] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2011] [Revised: 09/06/2011] [Accepted: 12/08/2011] [Indexed: 11/29/2022]
Abstract
Inverse gas chromatography (IGC) is a sensitive technique for the measurement of powder surface properties, especially surface energetics. Given the importance of these characteristics to the performance of dry powder inhaler formulations (DPIs), it is unsurprising that IGC has been applied to the study of these systems. Monitoring batch-to-batch variation and the effects of processing steps are established uses of IGC in this field and the relevant studies are discussed. A less established use of IGC is for the prediction of DPI performance. Although some groups have found a negative relationship between the dispersive surface energy of one formulation component and fine particle delivery, such studies often have a number of limitations. More complex approaches have failed to produce consistent results. Further, more carefully designed, studies are required in this area. In the final section of this article, some areas for on-going research are discussed, including the need to critically assess the best method for the calculation of the specific free energy of adsorption with pharmaceutical materials.
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Lactose characteristics and the generation of the aerosol. Adv Drug Deliv Rev 2012; 64:233-56. [PMID: 21616107 DOI: 10.1016/j.addr.2011.05.003] [Citation(s) in RCA: 151] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2010] [Revised: 04/27/2011] [Accepted: 05/06/2011] [Indexed: 11/23/2022]
Abstract
The delivery efficiency of dry-powder products for inhalation is dependent upon the drug formulation, the inhaler device, and the inhalation technique. Dry powder formulations are generally produced by mixing the micronised drug particles with larger carrier particles. These carrier particles are commonly lactose. The aerosol performance of a powder is highly dependent on the lactose characteristics, such as particle size distribution and shape and surface properties. Because lactose is the main component in these formulations, its selection is a crucial determinant of drug deposition into the lung, as interparticle forces may be affected by the carrier-particle properties. Therefore, the purpose of this article is to review the various grades of lactose, their production, and the methods of their characterisation. The origin of their adhesive and cohesive forces and their influence on aerosol generation are described, and the impact of the physicochemical properties of lactose on carrier-drug dispersion is discussed in detail.
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23
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Le V, Bierend H, Robins E, Steckel H, Flament M. Influence of the lactose grade within dry powder formulations of fluticasone propionate and terbutaline sulphate. Int J Pharm 2012; 422:75-82. [DOI: 10.1016/j.ijpharm.2011.10.030] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Revised: 09/19/2011] [Accepted: 10/17/2011] [Indexed: 10/16/2022]
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24
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Royall P, Woodhead B, Tang S, Martin G, Stockton B, Murnane D. Formation and measurement of process induced disorder during the manufacture of inhalation medicines. J Drug Deliv Sci Technol 2011. [DOI: 10.1016/s1773-2247(11)50048-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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25
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Investigation of the dynamic process during spray-drying to improve aerodynamic performance of inhalation particles. Int J Pharm 2010; 390:250-9. [DOI: 10.1016/j.ijpharm.2010.02.018] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2009] [Revised: 01/06/2010] [Accepted: 02/10/2010] [Indexed: 11/23/2022]
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26
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Tozuka Y, Miyazaki Y, Takeuchi H. A combinational supercritical CO2 system for nanoparticle preparation of indomethacin. Int J Pharm 2010; 386:243-8. [DOI: 10.1016/j.ijpharm.2009.10.044] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2009] [Revised: 10/07/2009] [Accepted: 10/25/2009] [Indexed: 10/20/2022]
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27
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Ho R, Muresan AS, Hebbink GA, Heng JYY. Influence of fines on the surface energy heterogeneity of lactose for pulmonary drug delivery. Int J Pharm 2009; 388:88-94. [PMID: 20038447 DOI: 10.1016/j.ijpharm.2009.12.037] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2009] [Revised: 12/10/2009] [Accepted: 12/18/2009] [Indexed: 12/01/2022]
Abstract
The effects of the blending of lactose fines to the overall adhesion property of coarse alpha-lactose monohydrate carrier particles were investigated. Five samples, three of them commercial samples from DOMO (Lactohale) LH100, LH210, and LH250) whilst the other two are blends of LH210 and LH250, were studied. Characterisation included particle sizing, SEM, PXRD and IGC. Dispersive surface energy gamma(SV)(d) was determined using a finite concentration IGC method to obtain a distribution profile. The gamma(SV)(d) distribution of lactose crystals was found to vary from 40 to 48mJ/m(2). The unmilled coarse crystalline lactose sample (LH100) gamma(SV)(d) was lowest and showed less heterogeneity than the milled sample (LH250). Fines (LH210) were found to have the highest gamma(SV)(d) value. The samples with loaded LH210 were found to have a higher energy than LH100. The amount of LH210 in Blend 1 was not able to decrease surface energy heterogeneity, whereas sample Blend 2 showed adequate loading of fines to obtain a relatively homogeneous surface. Addition of fines resulted in an increase in gamma(SV)(d), suggesting that coarse lactose surfaces were replaced by surfaces of the fines. Increasing the loading of fines may result in a more homogeneous surface energy of lactose particles.
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Affiliation(s)
- Raimundo Ho
- Surfaces and Particle Engineering Laboratory, Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
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28
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Surface energy changes and their relationship with the dispersibility of salmeterol xinafoate powders for inhalation after storage at high RH. Eur J Pharm Sci 2009; 38:347-54. [DOI: 10.1016/j.ejps.2009.08.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2009] [Revised: 08/20/2009] [Accepted: 08/27/2009] [Indexed: 11/24/2022]
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29
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Ragab DM, Rohani S. Particle Engineering Strategies via Crystallization for Pulmonary Drug Delivery. Org Process Res Dev 2009. [DOI: 10.1021/op900013a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Doaa M. Ragab
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, Canada N6A 5B9
| | - Sohrab Rohani
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, Canada N6A 5B9
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30
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Murnane D, Martin GP, Marriott C. Dry powder formulations for inhalation of fluticasone propionate and salmeterol xinafoate microcrystals. J Pharm Sci 2009; 98:503-15. [PMID: 18506819 DOI: 10.1002/jps.21450] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Direct crystallization of active pharmaceutical ingredient (API) particles in the inhalable size range of 1-6 microm may overcome surface energization resulting from micronization. The aerosolization of fluticasone propionate (FP) and salmeterol xinafoate (SX) microcrystals produced by aqueous crystallization from poly(ethylene glycol) solutions was investigated using a twin stage impinger following blending with lactose. Fine particle fractions from SX formulations ranged from 15.98 +/- 2.20% from SX crystallized from PEG 6000 to 26.26 +/- 1.51% for SX crystallized from PEG 400. The FPF of microcrystal formulations increased as the particle size of microcrystals was increased. The aerosolization of SX from DPI blends was equivalent for the microcrystals and the micronized material. FP microcrystals, which had a needlelike morphology, produced similar FPFs (PEG 400: 17.15 +/- 0.68% and PEG 6000: 15.46 +/- 0.97%) to micronized FP (mFP; 14.21 +/- 0.54). The highest FPF (25.66 +/- 1.51%) resulted from the formulation of FP microcrystals with the largest median diameter (FP PEG 400B: 6.14 +/- 0.17 microm). Microcrystallization of SX and FP from PEG solvents offers the potential for improving control of particulate solid state properties and was shown to represent a viable alternative to micronization for the production of particles for inclusion in dry powder inhalation formulations.
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Affiliation(s)
- Darragh Murnane
- King's College London, Drug Delivery Research Group, Pharmaceutical Science Division, London, United Kingdom
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31
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Polymorphic control of inhalation microparticles prepared by crystallization. Int J Pharm 2008; 361:141-9. [DOI: 10.1016/j.ijpharm.2008.05.033] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2008] [Revised: 05/09/2008] [Accepted: 05/23/2008] [Indexed: 11/22/2022]
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32
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James J, Crean B, Davies M, Toon R, Jinks P, Roberts CJ. The surface characterisation and comparison of two potential sub-micron, sugar bulking excipients for use in low-dose, suspension formulations in metered dose inhalers. Int J Pharm 2008; 361:209-21. [PMID: 18577435 DOI: 10.1016/j.ijpharm.2008.05.032] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2007] [Revised: 05/03/2008] [Accepted: 05/23/2008] [Indexed: 11/19/2022]
Abstract
PURPOSE This study compares the surface characteristics and surface energetics of two potential bulking excipients, anhydrous sub-micron alpha-lactose and sub-micron sucrose, for use with low-dose, suspension formulations in pressurised metered dose inhalers (pMDIs). Both sub-micron bulking excipients are processed from parent materials (alpha-lactose monohydrate/alpha-lactose monohydrate and silk grade sucrose, respectively) so the surface characteristics of each material were determined and compared. Additionally, the surface energetics and adhesive interactions between each sub-micron bulking excipient and some chosen active pharmaceutical ingredients (APIs) used in pMDI formulations were also determined. From this data, it was possible to predict the potential degree of interaction between the APIs and each sub-micron bulking excipient, thus determining suitable API-excipient combinations for pMDI formulation optimisation. Salmon calcitonin was also investigated as a potential API due to the current interest in, and the potential low-dose requirements for, the pulmonary delivery of proteins. METHODS The size and morphology of each sub-micron excipient (and parent materials) were determined using scanning electron microscopy (SEM) and the crystalline nature of each sub-micron excipient and parent material was assessed using X-ray diffraction (XRD). The surface chemistry of each sub-micron excipient was analysed using X-ray photoelectron spectroscopy (XPS). The surface energies of each sub-micron excipient, along with their respective parent materials and any intermediates, were determined using two techniques. The surface energies of these materials were determined via (a) single particle adhesive interactions using atomic force microscopy (AFM) and (b) 'bulk' material surface interactions using contact angle measurements (CA). From the CA data, it was possible to calculate the theoretical work of adhesion values for each API-excipient interaction using the surface component analysis (SCA). The Young's modulus for each sub-micron excipient and parent material was also determined using AFM. Finally, the adhesive interactions were determined between each sub-micron bulking excipient and five APIs (formoterol fumarate, salmeterol xinafoate, salbutamol sulphate, mometasone furoate and salmon calcitonin). RESULTS Both sub-micron sucrose and anhydrous sub-micron alpha-lactose exhibited a lower surface free energy than their respective parent materials/intermediates. In addition, both AFM and CA surface energy measurements also showed that sub-micron sucrose has a higher surface energy than anhydrous sub-micron alpha-lactose. Theoretical work of adhesion values between anhydrous sub-micron alpha-lactose and each API are considerably lower than those observed between micronised alpha-lactose monohydrate and each API. Corresponding theoretical work of adhesion values between sub-micron sucrose and each API were almost identical to those observed between silk grade sucrose and each API. Young's modulus determination revealed that sub-micron sucrose has a greater crystal hardness/elasticity ratio than anhydrous sub-micron alpha-lactose. With the exception of salmon calcitonin, sub-micron sucrose showed larger adhesive interactions to the selected APIs than anhydrous sub-micron alpha-lactose. CONCLUSIONS Anhydrous sub-micron alpha-lactose has been found to have lower adhesive interactions with a range of chosen, low-dose APIs compared to sub-micron sucrose. This could be related to the lower surface energy for anhydrous sub-micron alpha-lactose. Knowledge of the surface free energy and mechanical properties of potential sub-micron bulking excipients and API materials could provide useful information regarding the selection of suitable API-submicron bulking excipient combinations during the development and optimisation stages of suspension pMDI formulations.
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Affiliation(s)
- Jeff James
- Laboratory of Biophysics and Surface Analysis, School of Pharmacy, The University of Nottingham, Nottingham NG7 2RD, UK.
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33
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Murnane D, Marriott C, Martin GP. Developing an environmentally benign process for the production of microparticles: Amphiphilic crystallization. Eur J Pharm Biopharm 2008; 69:72-82. [DOI: 10.1016/j.ejpb.2007.10.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2007] [Revised: 10/19/2007] [Accepted: 10/24/2007] [Indexed: 11/24/2022]
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34
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Mishima K. Biodegradable particle formation for drug and gene delivery using supercritical fluid and dense gas. Adv Drug Deliv Rev 2008; 60:411-32. [PMID: 18061302 DOI: 10.1016/j.addr.2007.02.003] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2006] [Accepted: 02/26/2007] [Indexed: 10/22/2022]
Abstract
Recent developments in biodegradable particle formation using supercritical fluids and dense gases have been reviewed with an emphasis on studies of micronizing and encapsulating poorly-soluble pharmaceuticals and gene. General review articles published in previous years have then been provided. A brief description of the operating principles of some types of particle formation processes is given. These include the rapid expansion of supercritical solutions (RESS), the particles from gas-saturated solution (PGSS) processes, the gas antisolvent process (GAS), and the supercritical antisolvent process (SAS). The papers have been reviewed under two groups, one involving the production of particles from pure biodegradable substances, and the other involving coating, capsule, and impregnation that contain active components, especially those that relate to pharmaceuticals. This review is a comprehensive review specifically focused on the formation of biodegradable particles for drug and gene delivery system using supercritical fluid and dense gas.
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35
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Tong HHY, Shekunov BY, York P, Chow AHL. Influence of Operating Temperature and Pressure on the Polymorphic Transition of Salmeterol Xinafoate in Supercritical Fluids. J Pharm Sci 2008; 97:1025-9. [PMID: 17497727 DOI: 10.1002/jps.21011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Precipitation of pure polymorphic forms (I and II) of salmeterol xinafoate (SX) in supercritical fluids was investigated as a function of operating pressure and temperature. It has been shown that the formation of each polymorph is governed by both thermodynamic shift and kinetic effects, which are closely associated with the extent of miscibility between the supercritical CO(2) and methanol cosolvent. In addition, the surface energetics of SX exhibit a sharp discontinuity at the transition point in concordance with the particular polymorphic form generated, being essentially independent of the temperature or pressure below and above this point. The conditions of complete miscibility of the two solvent phases involved are critical for the formation of SX Form II.
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Affiliation(s)
- Henry H Y Tong
- School of Health Sciences, Macao Polytechnic Institute, Macao, China
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36
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Kumon M, Machida S, Suzuki M, Kusai A, Yonemochi E, Terada K. Application and Mechanism of Inhalation Profile Improvement of DPI Formulations by Mechanofusion with Magnesium Stearate. Chem Pharm Bull (Tokyo) 2008; 56:617-25. [DOI: 10.1248/cpb.56.617] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Michiko Kumon
- Formulation Technology Research Laboratories, Daiichi Sankyo Co., Ltd
| | | | - Masahiko Suzuki
- Formulation Technology Research Laboratories, Daiichi Sankyo Co., Ltd
| | - Akira Kusai
- Formulation Technology Research Laboratories, Daiichi Sankyo Co., Ltd
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37
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Chow AHL, Tong HHY, Chattopadhyay P, Shekunov BY. Particle Engineering for Pulmonary Drug Delivery. Pharm Res 2007; 24:411-37. [PMID: 17245651 DOI: 10.1007/s11095-006-9174-3] [Citation(s) in RCA: 419] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2006] [Accepted: 10/05/2006] [Indexed: 10/23/2022]
Abstract
With the rapidly growing popularity and sophistication of inhalation therapy, there is an increasing demand for tailor-made inhalable drug particles capable of affording the most efficient delivery to the lungs and the most optimal therapeutic outcomes. To cope with this formulation demand, a wide variety of novel particle technologies have emerged over the past decade. The present review is intended to provide a critical account of the current goals and technologies of particle engineering for the development of pulmonary drug delivery systems. These technologies cover traditional micronization and powder blending, controlled solvent crystallization, spray drying, spray freeze drying, particle formation from liquid dispersion systems, supercritical fluid processing and particle coating. The merits and limitations of these technologies are discussed with reference to their applications to specific drug and/or excipient materials. The regulatory requirements applicable to particulate inhalation products are also reviewed briefly.
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Affiliation(s)
- Albert H L Chow
- School of Pharmacy, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, SAR, China.
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38
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Jones MD, Price R. The Influence of Fine Excipient Particles on the Performance of Carrier-Based Dry Powder Inhalation Formulations. Pharm Res 2006; 23:1665-74. [PMID: 16845584 DOI: 10.1007/s11095-006-9012-7] [Citation(s) in RCA: 144] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2006] [Accepted: 03/17/2006] [Indexed: 10/24/2022]
Abstract
The inclusion of a small amount of fine particle excipient in a carrier-based dry powder inhalation system is a well researched technique to improve formulation performance and is employed in the pharmaceutical industry. The removal of intrinsic fines from a lactose carrier has been found to decrease formulation performance, whereas adding fines of many different materials into formulations increased performance. Changing the particle size of these fines, the amount added and the technique by which they were prepared also affected formulation behaviour. Despite this body of research, there is disagreement as to the mechanism by which fines improved formulation performance, with two main hypotheses presented in the literature. The first hypothesis suggested that fines prevent the drug from adhering to the strongest binding sites on the carrier, whilst the second proposed that fine particles of drug and excipient form mixed agglomerates that are more easily dispersed and deaggregated during aerosolisation. The evidence in support of each hypothesis is limited and it is clear that future research should aim to produce stronger mechanistic evidence. The investigation of interparticulate interactions using techniques such as atomic force microscopy and inverse gas chromatography may prove useful in achieving this aim.
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Affiliation(s)
- Matthew D Jones
- Pharmaceutical Surface Science Research Group, Department of Pharmacy and Pharmacology, University of Bath, Bath, BA2 7AY, UK
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