1
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Simonsson A, Bramer T, Wimbush A, Alderborn G. Effect of drug load on the aerosolisation propensity of binary adhesive mixtures for inhalation. Int J Pharm 2024; 657:124122. [PMID: 38621619 DOI: 10.1016/j.ijpharm.2024.124122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 04/12/2024] [Accepted: 04/12/2024] [Indexed: 04/17/2024]
Abstract
The aim of this study was to investigate how the propensity for aerosolisation in binary adhesive mixtures was affected by the drug load, and to determine whether these findings could be linked to different blend states. Binary blends of two different lactose carriers, each with varying size and morphology, were prepared together with budesonide. In vitro aerosolisation studies were conducted at four different pressure drops, ranging from 0.5 to 4 kPa, utilising a Next Generation Impactor. Several dispersion parameters were derived from the relationship between the quantity of dispersed API and the pressure drop. The evolution of the parameters with drug load was complex, especially at low drug loads. While similar responses were observed for both carriers, the range of drug load that could be used varied significantly. The choice of carrier not only influenced the capacity for drug loading but also affected the spatial distribution of the API within the mixture, which, in turn, affected its aerosolisation propensity. Thus, the drug dispersion process could be linked to different configurations of the lactose carrier and budesonide in the blends, i.e. blend states. In conclusion, the study suggests that the concept of blend states can provide an explanation for the complex dispersion process observed in adhesive blends.
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Affiliation(s)
- Anna Simonsson
- Department of Pharmaceutical Biosciences and the Swedish Drug Delivery Center (SweDeliver), Uppsala University, Box 591, SE-751 24 Uppsala, Sweden.
| | - Tobias Bramer
- Inhalation Product Development, Pharmaceutical Technology & Development, AstraZeneca Gothenburg, Sweden
| | - Alex Wimbush
- Inhalation Product Development, Pharmaceutical Technology & Development, AstraZeneca Gothenburg, Sweden
| | - Göran Alderborn
- Department of Pharmaceutical Biosciences and the Swedish Drug Delivery Center (SweDeliver), Uppsala University, Box 591, SE-751 24 Uppsala, Sweden
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2
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Bier R, Eder C, Schiele SA, Briesen H. Selective anomer crystallization from aqueous solution: Monitoring lactose recovery under mutarotation limitation via attenuated total reflection Fourier-transform spectroscopy and theoretical rate analysis. J Dairy Sci 2024; 107:790-812. [PMID: 37769945 DOI: 10.3168/jds.2023-23487] [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: 03/14/2023] [Accepted: 09/02/2023] [Indexed: 10/03/2023]
Abstract
Lactose is typically produced via cooling crystallization either from whey or whey permeate (edible grade) or from aqueous solution (pharmaceutical grade). While in solution, lactose is present in 2 anomeric forms, α- and β-lactose. During cooling crystallization under standard process conditions, only α-lactose crystallizes, depleting the solution of α-anomer. In practice, mutarotation kinetics are often assumed to be much faster than crystallization. However, some literature reports limitation of crystallization by mutarotation. In the present research, we investigate the influence of operating conditions on mutarotation in lactose crystallization and explore the existence of an operation regimen where mutarotation can be disregarded in the crystallization process. Therefore, we study crystallization from aqueous lactose solutions by inline monitoring of concentrations of α- and β-lactose via attenuated total reflection Fourier-transform spectroscopy. By implementing a linear cooling profile of 9 K/h to a minimum temperature of 10°C, we measured a remarkable increase in β/α ratio, reaching a maximum of 2.19. This ratio exceeds the equilibrium level by 36%. However, when the same cooling profile was applied to a minimum temperature of 25°C, the deviation was significantly lower, with a maximum β/α ratio of 1.72, representing only an 8% deviation from equilibrium. We also performed a theoretical assessment of the influence of process parameters on crystallization kinetics. We conclude that mutarotation needs to be taken into consideration for efficient crystallization control if the crystal surface area and supersaturation are sufficiently high.
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Affiliation(s)
- Ramona Bier
- Process Systems Engineering, School of Life Sciences, Technical University of Munich, 85354, Freising, Germany
| | - Cornelia Eder
- Process Systems Engineering, School of Life Sciences, Technical University of Munich, 85354, Freising, Germany
| | - Simon A Schiele
- Process Systems Engineering, School of Life Sciences, Technical University of Munich, 85354, Freising, Germany
| | - Heiko Briesen
- Process Systems Engineering, School of Life Sciences, Technical University of Munich, 85354, Freising, Germany.
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3
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Tanprasert S, Kampeewichean C, Shiratori S, Piemjaiswang R, Chalermsinsuwan B. Non-spherical drug particle deposition in human airway using computational fluid dynamics and discrete element method. Int J Pharm 2023; 639:122979. [PMID: 37100258 DOI: 10.1016/j.ijpharm.2023.122979] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Revised: 04/05/2023] [Accepted: 04/19/2023] [Indexed: 04/28/2023]
Abstract
Currently, the air pollution and the respiratory disease problems that affect human health are increasing rapidly. Hence, there is attention for trend prediction of the located deposition of inhaled particles. In this study, Weibel's based human airway model (G0-G5) was employed. The computational fluid dynamics and discrete element method (CFD-DEM) simulation was successfully validated by comparison to the previous research studies. The CFD-DEM achieves a better balance between numerical accuracy and computational requirement when comparing with the other methods. Then, the model was used to analyze the non-spherical drug transport with different drug particle sizes, shapes, density, and concentrations. The results found that all the studied factors affected the drug deposition and particle out-mass percentage except the drug concentration. The drug deposition was increased with the increasing of particle size and particle density due to the influence of particle inertia. The Tomahawk-shaped drug deposited easier than the cylindrical drug shape because of the different drag behavior. For the effect of airway geometries, G0 was the maximum deposited zone and G3 was the minimum deposited zone. The boundary layer was found around bifurcation due to the shear force at the wall. Finally, the knowledge can give an essential recommendation for curing patients with pharmaceutical aerosol. The design suggestion of a proper drug delivery device can be summarized.
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Affiliation(s)
- Sorathan Tanprasert
- Fuels Research Center, Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand
| | - Chanida Kampeewichean
- Fuels Research Center, Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand
| | - Shuichi Shiratori
- Division of Nuclear Medicine, Department of Radiology, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, 10700, Thailand
| | - Ratchanon Piemjaiswang
- Environmental Research Institute, Chulalongkorn University, Institute Building 2, 254 Phayathai Road, Wangmai, Pathumwan, Bangkok, 10330, Thailand
| | - Benjapon Chalermsinsuwan
- Fuels Research Center, Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand; Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, 254 Phayathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand; Advanced Computational Fluid Dynamics Research Unit, Chulalongkorn University, 254 Phayathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand.
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4
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Mahar R, Chakraborty A, Nainwal N. The influence of carrier type, physical characteristics, and blending techniques on the performance of dry powder inhalers. J Drug Deliv Sci Technol 2022. [DOI: 10.1016/j.jddst.2022.103759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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5
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Spherical agglomerates of lactose as potential carriers for inhalation. Eur J Pharm Biopharm 2020; 159:11-20. [PMID: 33358941 DOI: 10.1016/j.ejpb.2020.12.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 12/02/2020] [Accepted: 12/15/2020] [Indexed: 11/21/2022]
Abstract
We report here on spherical lactose agglomerates as potential carriers for inhalation applications. Micromeritic properties of three spherical lactose agglomerates (SA-A, SA-B, SA-C) and a standard lactose inhalation grade carrier (Lactohale 100; LH100) were evaluated and compared. Ordered mixtures with micronized salbutamol sulfate as the model active pharmaceutical ingredient (API) and lactose carriers at two drug loadings (2 wt%, 5 wt%) were prepared, and in-vitro aerosolization performance was assessed. The spherical crystallization process led to particles with tailored micromeritic properties. These had larger specific surface area and greater fine fraction < 10 µm, compared to LH100, due to their coarse morphology. Their properties were reflected in the flowability parameters, where two types of spherical agglomerates of lactose showed more cohesive behavior compared to the other lactose grades. Blend uniformity showed improved homogeneous distribution of the API at higher drug load. In-vitro aerosolization tests showed that the spherical agglomerates of lactose enhanced the dose of API, compared to LH100. SA-B and SA-C showed significantly higher fine particle fractions at low drug load compared to the others, whereas overall, the largest fine particle fraction was for SA-B at high drug load. The carrier material attributes related to particle size, specific surface area, compressibility, flowability (cohesion, flow function), and air permeability were critical for aerosolization performance.
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6
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Batghare AH, Roy K, Moholkar VS. Investigations in physical mechanism of ultrasound-assisted antisolvent batch crystallization of lactose monohydrate from aqueous solutions. ULTRASONICS SONOCHEMISTRY 2020; 67:105127. [PMID: 32334378 DOI: 10.1016/j.ultsonch.2020.105127] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 03/21/2020] [Accepted: 04/07/2020] [Indexed: 05/28/2023]
Abstract
Sonication is known to enhance crystallization of lactose from aqueous solutions. This study has attempted to reveal the mechanistic features of antisolvent crystallization of lactose monohydrate from aqueous solutions. Experiments were conducted in three protocols, viz. mechanical stirring, mechanical stirring with sonication and sonication at elevated static pressure. Mechanical stirring provided macroconvection while sonication induced microconvection in the system. Other experimental parameters were initial lactose concentration and rate of antisolvent (ethanol) addition. Kinetic parameters of crystallization were coupled with simulations of bubble dynamics. The growth rate of crystals, rate of nucleation, average size of crystal crop and total lactose yield in different protocols were related to nature of convection in the medium. Macroconvection assisted nucleation but could not give high growth rate. Microconvection comprised of microstreaming due to ultrasound and acoustic (or shock) waves due to transient cavitation. Sonication at atmospheric static pressure enhanced growth rate but reduced nucleation. However, with elimination of cavitation at elevated static pressure, sonication enhanced both nucleation and growth rate resulting in almost complete lactose recovery.
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Affiliation(s)
- Amit H Batghare
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
| | - Kuldeep Roy
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
| | - Vijayanand S Moholkar
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India.
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7
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Cavalli G, Bosi R, Ghiretti A, Cottini C, Benassi A, Gaspari R. A shear cell study on oral and inhalation grade lactose powders. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2020.05.041] [Citation(s) in RCA: 1] [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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8
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Crosslinked poly(Lactose) microgels and nanogels for biomedical applications. J Colloid Interface Sci 2019; 553:805-812. [DOI: 10.1016/j.jcis.2019.06.078] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 06/21/2019] [Accepted: 06/24/2019] [Indexed: 01/29/2023]
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9
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Influence of lactic, citric and phosphoric acids on the properties of concentrated lactose solutions. Food Chem 2019; 293:247-253. [PMID: 31151608 DOI: 10.1016/j.foodchem.2019.04.065] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 04/16/2019] [Accepted: 04/17/2019] [Indexed: 11/23/2022]
Abstract
Physicochemical and thermal characteristics of concentrated lactose solutions containing 0.05, 1, or 4% (w/w) of three acids commonly used in the food industry, i.e., lactic, citric, and phosphoric acid, were studied. Properties of both lactose and water were affected by all acids studied. Thermographic analysis showed that interactions between water and acids hindered evaporation of water from most of lactose solutions. This effect was mostly related to the formation of a strong hydration layer around lactose molecules by hydrogen bonds. Acid-induced hydrolysis of lactose into glucose and galactose varied depending on the concentration, hydrolytic power of acids and molecular interactions in the system. The study concluded that the varying physical, chemical, structural and thermal characteristics of lactose as affected by the presence of different acids was mainly due to the manipulation of water-lactose interactions, whereas the hydrolysis of lactose by the acids plays a smaller role.
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10
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Zellnitz S, Roblegg E, Pinto J, Fröhlich E. Delivery of Dry Powders to the Lungs: Influence of Particle Attributes from a Biological and Technological Point of View. Curr Drug Deliv 2019; 16:180-194. [PMID: 30360739 DOI: 10.2174/1567201815666181024143249] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 09/21/2018] [Accepted: 10/18/2018] [Indexed: 12/19/2022]
Abstract
Dry powder inhalers are medical devices used to deliver powder formulations of active pharmaceutical ingredients via oral inhalation to the lungs. Drug particles, from a biological perspective, should reach the targeted site, dissolve and permeate through the epithelial cell layer in order to deliver a therapeutic effect. However, drug particle attributes that lead to a biological activity are not always consistent with the technical requirements necessary for formulation design. For example, small cohesive drug particles may interact with neighbouring particles, resulting in large aggregates or even agglomerates that show poor flowability, solubility and permeability. To circumvent these hurdles, most dry powder inhalers currently on the market are carrier-based formulations. These formulations comprise drug particles, which are blended with larger carrier particles that need to detach again from the carrier during inhalation. Apart from blending process parameters, inhaler type used and patient's inspiratory force, drug detachment strongly depends on the drug and carrier particle characteristics such as size, shape, solid-state and morphology as well as their interdependency. This review discusses critical particle characteristics. We consider size of the drug (1-5 µm in order to reach the lung), solid-state (crystalline to guarantee stability versus amorphous to improve dissolution), shape (spherical drug particles to avoid macrophage clearance) and surface morphology of the carrier (regular shaped smooth or nano-rough carrier surfaces for improved drug detachment.) that need to be considered in dry powder inhaler development taking into account the lung as biological barrier.
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Affiliation(s)
- Sarah Zellnitz
- Research Center Pharmaceutical Engineering GmbH, Graz, Austria
| | - Eva Roblegg
- Research Center Pharmaceutical Engineering GmbH, Graz, Austria.,Department of Pharmaceutical Technology and Biopharmacy, Institute of Pharmaceutical Sciences, University of Graz, Graz, Austria
| | - Joana Pinto
- Research Center Pharmaceutical Engineering GmbH, Graz, Austria.,Department of Pharmaceutical Technology and Biopharmacy, Institute of Pharmaceutical Sciences, University of Graz, Graz, Austria
| | - Eleonore Fröhlich
- Research Center Pharmaceutical Engineering GmbH, Graz, Austria.,Center for Medical Research, Medical University of Graz, Graz, Austria
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11
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Tay JYS, Kok BWT, Liew CV, Heng PWS. Effects of Particle Surface Roughness on In-Die Flow and Tableting Behavior of Lactose. J Pharm Sci 2019; 108:3011-3019. [PMID: 31054886 DOI: 10.1016/j.xphs.2019.04.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2019] [Revised: 04/11/2019] [Accepted: 04/23/2019] [Indexed: 10/26/2022]
Abstract
Particle rearrangement takes place during the initial phase of tablet compaction. In this study, rough lactose particles were prepared by roller compaction, and their surface roughness modified by partial surface dissolution using a fluidized bed processor. Flow characteristics of the particles were determined using various flow methods, and their compaction characteristics studied using a compaction simulator with punches of different geometry and compaction pressure. Rougher particles demonstrated poorer compressibility and powder flow due to the higher interparticulate frictional forces required for particle movement. Rearrangement energy during tablet compaction was found to be correlated with compressibility (R2 = 0.92) and increased with surface roughness of the particles. Particle rearrangement was found to be dependent on interparticulate frictional forces, which could be measured using FT4 powder rheometer variable flow rate test and compressibility test. Plastic energy decreased as a result of the increased rearrangement energy requirements. Decrease in tensile strength as a result of decrease in plastic energy was not significantly different. Roller-compacted lactose particles produced tablets of higher tensile strength than crystalline lactose because of prefragmentation of the crystalline structure during roller compaction.
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Affiliation(s)
- Justin Yong Soon Tay
- GEA-NUS Pharmaceutical Processing Research Laboratory, Department of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore 117543, Singapore
| | - Berlinda Wen Ting Kok
- GEA-NUS Pharmaceutical Processing Research Laboratory, Department of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore 117543, Singapore
| | - Celine Valeria Liew
- GEA-NUS Pharmaceutical Processing Research Laboratory, Department of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore 117543, Singapore
| | - Paul Wan Sia Heng
- GEA-NUS Pharmaceutical Processing Research Laboratory, Department of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore 117543, Singapore.
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12
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Simone E, Tyler AII, Kuah D, Bao X, Ries ME, Baker D. Optimal Design of Crystallization Processes for the Recovery of a Slow-Nucleating Sugar with a Complex Chemical Equilibrium in Aqueous Solution: The Case of Lactose. Org Process Res Dev 2019. [DOI: 10.1021/acs.oprd.8b00323] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Elena Simone
- Food Colloids and Processing Group, School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, U.K
| | - Arwen I. I. Tyler
- Food Colloids and Processing Group, School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, U.K
| | - Daniel Kuah
- Food Colloids and Processing Group, School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, U.K
| | - Xiaofan Bao
- Food Colloids and Processing Group, School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, U.K
| | - Michael E. Ries
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, U.K
| | - Daniel Baker
- School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, U.K
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13
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Adhikari BM, Truong T, Bansal N, Bhandari B. Influence of gas addition on crystallisation behaviour of lactose from supersaturated solution. FOOD AND BIOPRODUCTS PROCESSING 2018. [DOI: 10.1016/j.fbp.2018.03.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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14
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Patil S, Mahadik A, Nalawade P, More P. Crystal engineering of lactose using electrospray technology: carrier for pulmonary drug delivery. Drug Dev Ind Pharm 2017; 43:2085-2091. [DOI: 10.1080/03639045.2017.1371733] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Sharvil Patil
- Department of Pharmaceutics, Poona College of Pharmacy, Bharati Vidyapeeth University, Pune, India
| | - Abhijeet Mahadik
- Department of Pharmaceutics, Poona College of Pharmacy, Bharati Vidyapeeth University, Pune, India
| | - Pradeep Nalawade
- Department of Pharmaceutics, Poona College of Pharmacy, Bharati Vidyapeeth University, Pune, India
| | - Priyesh More
- Department of Applied Chemistry, Defense Institute of Advanced Technology, Pune, India
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15
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Della Bella A, Salomi E, Buttini F, Bettini R. The role of the solid state and physical properties of the carrier in adhesive mixtures for lung delivery. Expert Opin Drug Deliv 2017; 15:665-674. [DOI: 10.1080/17425247.2017.1371132] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
| | - Enrico Salomi
- Food and Drug Department, University of Parma, Parma, Italy
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16
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Peng T, Zhang X, Huang Y, Zhao Z, Liao Q, Xu J, Huang Z, Zhang J, Wu CY, Pan X, Wu C. Nanoporous mannitol carrier prepared by non-organic solvent spray drying technique to enhance the aerosolization performance for dry powder inhalation. Sci Rep 2017; 7:46517. [PMID: 28462948 PMCID: PMC5411962 DOI: 10.1038/srep46517] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Accepted: 03/17/2017] [Indexed: 12/01/2022] Open
Abstract
An optimum carrier rugosity is essential to achieve a satisfying drug deposition efficiency for the carrier based dry powder inhalation (DPI). Therefore, a non-organic spray drying technique was firstly used to prepare nanoporous mannitol with small asperities to enhance the DPI aerosolization performance. Ammonium carbonate was used as a pore-forming agent since it decomposed with volatile during preparation. It was found that only the porous structure, and hence the specific surface area and carrier density were changed at different ammonium carbonate concentration. Furthermore, the carrier density was used as an indication of porosity to correlate with drug aerosolization. A good correlation between the carrier density and fine particle fraction (FPF) (r2 = 0.9579) was established, suggesting that the deposition efficiency increased with the decreased carrier density. Nanoporous mannitol with a mean pore size of about 6 nm exhibited 0.24-fold carrier density while 2.16-fold FPF value of the non-porous mannitol. The enhanced deposition efficiency was further confirmed from the pharmacokinetic studies since the nanoporous mannitol exhibited a significantly higher AUC0-8h value than the non-porous mannitol and commercial product Pulmicort. Therefore, surface modification by preparing nanoporous carrier through non-organic spray drying showed to be a facile approach to enhance the DPI aerosolization performance.
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Affiliation(s)
- Tingting Peng
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Xuejuan Zhang
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Ying Huang
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Ziyu Zhao
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Qiuying Liao
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Jing Xu
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Zhengwei Huang
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Jiwen Zhang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Chuan-Yu Wu
- Department of Chemical and Process Engineering, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
| | - Xin Pan
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China.,Zhongshan WanYuan New Drug R&D Co., Ltd., Zhongshan City 528451, China
| | - Chuanbin Wu
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China.,Guangdong Research Center for Drug Delivery Systems, Guangzhou 510006, China
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17
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Effect of Carbonation of Supersaturated Lactose Solution on Crystallisation Behaviour of Alpha-Lactose Monohydrate. FOOD BIOPHYS 2016. [DOI: 10.1007/s11483-016-9462-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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18
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Wu S, Zellnitz S, Mercuri A, Salar-Behzadi S, Bresciani M, Fröhlich E. An in vitro and in silico study of the impact of engineered surface modifications on drug detachment from model carriers. Int J Pharm 2016; 513:109-117. [DOI: 10.1016/j.ijpharm.2016.08.064] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 08/17/2016] [Accepted: 08/30/2016] [Indexed: 11/28/2022]
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19
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Peng T, Lin S, Niu B, Wang X, Huang Y, Zhang X, Li G, Pan X, Wu C. Influence of physical properties of carrier on the performance of dry powder inhalers. Acta Pharm Sin B 2016; 6:308-18. [PMID: 27471671 PMCID: PMC4951591 DOI: 10.1016/j.apsb.2016.03.011] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Revised: 02/09/2016] [Accepted: 03/02/2016] [Indexed: 11/28/2022] Open
Abstract
Dry powder inhalers (DPIs) offer distinct advantages as a means of pulmonary drug delivery and have attracted much attention in the field of pharmaceutical science. DPIs commonly contain micronized drug particles which, because of their cohesiveness and strong propensity to aggregate, have poor aerosolization performance. Thus carriers with a larger particle size are added to address this problem. However, the performance of DPIs is profoundly influenced by the physical properties of the carrier, particularly their particle size, morphology/shape and surface roughness. Because these factors are interdependent, it is difficult to completely understand how they individually influence DPI performance. The purpose of this review is to summarize and illuminate how these factors affect drug–carrier interaction and influence the performance of DPIs.
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Key Words
- API, active pharmaceutical ingredient
- CLF, coarse lactose fines
- Carrier
- DPI, dry powder inhaler
- Dry powder inhaler
- ED, emission dose
- ER, elongation ratio
- FLF, fine lactose fines
- FPF, fine particle fraction
- FR, flatness ratio
- Fshape, shape factor
- Fsurface, surface factor
- MFV, minimum fluidization velocity
- Morphology
- PDD, pulmonary drug delivery
- Particle size
- Performance
- RO, roundness
- Surface roughness
- dae, aerodynamic diameter
- pMDI, pressurized metered-dose inhaler
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Affiliation(s)
- Tingting Peng
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Shiqi Lin
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Boyi Niu
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Xinyi Wang
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Ying Huang
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Xuejuan Zhang
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
| | - Ge Li
- Guangzhou Neworld Pharm. Co. Ltd., Guangzhou 51006, China
| | - Xin Pan
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
- Corresponding authors at: School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China. Tel.: +86 20 39943427/+86 20 39943117; fax: +86 20 39943115.School of Pharmaceutical Sciences, Sun Yat-Sen UniversityGuangzhou510006China
| | - Chuanbin Wu
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China
- Guangdong Research Center for Drug Delivery Systems, Guangzhou 510006, China
- Corresponding authors at: School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, China. Tel.: +86 20 39943427/+86 20 39943117; fax: +86 20 39943115.School of Pharmaceutical Sciences, Sun Yat-Sen UniversityGuangzhou510006China
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Kaialy W, Khan U, Mawlud S. Influence of mannitol concentration on the physicochemical, mechanical and pharmaceutical properties of lyophilised mannitol. Int J Pharm 2016; 510:73-85. [PMID: 27242312 DOI: 10.1016/j.ijpharm.2016.05.052] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Revised: 05/23/2016] [Accepted: 05/26/2016] [Indexed: 02/06/2023]
Abstract
Mannitol is a pharmaceutical excipient that is receiving increased popularity in solid dosage forms. The aim of this study was to provide comparative evaluation on the effect of mannitol concentration on the physicochemical, mechanical, and pharmaceutical properties of lyophilised mannitol. The results showed that the physicochemical, mechanical and pharmaceutical properties of lyophilised mannitol powders are strong functions of mannitol concentration. By decreasing mannitol concentration, the true density, bulk density, cohesivity, flowability, netcharge-to-mass ratio, and relative degree of crystallinity of LM were decreased, whereas the breakability, size distribution, and size homogeneity of lyophilised mannitol particles were increased. The mechanical properties of lyophilised mannitol tablets improved with decreasing mannitol concentration. The use of lyophilised mannitol has profoundly improved the dissolution rate of indomethacin from tablets in comparison to commercial mannitol. This improvement exhibited an increasing trend with decreasing mannitol concentration. In conclusion, mannitols lyophilised from lower concentrations are more desirable in tableting than mannitols from higher concentrations due to their better mechanical and dissolution properties.
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Affiliation(s)
- Waseem Kaialy
- School of Pharmacy, Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton, WV1 1LY, UK.
| | - Usman Khan
- School of Pharmacy, Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton, WV1 1LY, UK
| | - Shadan Mawlud
- School of Pharmacy, Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton, WV1 1LY, UK
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Tan BMJ, Chan LW, Heng PWS. Improving Dry Powder Inhaler Performance by Surface Roughening of Lactose Carrier Particles. Pharm Res 2016; 33:1923-35. [PMID: 27091033 DOI: 10.1007/s11095-016-1928-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 04/13/2016] [Indexed: 11/29/2022]
Abstract
PURPOSE This study investigated the impact of macro-scale carrier surface roughness on the performance of dry powder inhaler (DPI) formulations. METHODS Fluid-bed processing and roller compaction were explored as processing methods to increase the surface roughness (Ra) of lactose carrier particles. DPI formulations containing either (a) different concentrations of fine lactose at a fixed concentration of micronized drug (isoniazid) or (b) various concentrations of drug in the absence of fine lactose were prepared. The fine particle fraction (FPF) and aerodynamic particle size of micronized drug of all formulations were determined using the Next Generation Impactor. RESULTS Fluid-bed processing resulted in a modest increase in the Ra from 562 to 907 nm while roller compaction led to significant increases in Ra > 1300 nm. The roller compacted carriers exhibited FPF > 35%, which were twice that of the smoothest carriers. The addition of up to 5%, w/w of fine lactose improved the FPF of smoother carriers by 60-200% whereas only < 30% increase was observed in the rough carriers. Analysis of the FPF in tandem with shifts in the mass median aerodynamic diameter of dispersed drug suggested that the finest drug particles were entrapped on rougher surfaces while larger drug particles were dispersed in the air. CONCLUSIONS The results showed that the processing of lactose carrier particles by roller compaction was immensely beneficial to improving DPI performance, primarily due to increased surface roughness at the macro-scale.
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Affiliation(s)
- Bernice Mei Jin Tan
- GEA-NUS Pharmaceutical Processing Research Laboratory, Department of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore, 117543, Singapore
| | - Lai Wah Chan
- GEA-NUS Pharmaceutical Processing Research Laboratory, Department of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore, 117543, Singapore
| | - Paul Wan Sia Heng
- GEA-NUS Pharmaceutical Processing Research Laboratory, Department of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore, 117543, Singapore.
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23
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Zellnitz S, Schroettner H, Urbanetz NA. Influence of surface characteristics of modified glass beads as model carriers in dry powder inhalers (DPIs) on the aerosolization performance. Drug Dev Ind Pharm 2015; 41:1710-7. [PMID: 25632978 DOI: 10.3109/03639045.2014.997246] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The aim of this work is to investigate the effect of surface characteristics (surface roughness and specific surface area) of surface-modified glass beads as model carriers in dry powder inhalers (DPIs) on the aerosolization, and thus, the in vitro respirable fraction often referred to as fine particle fraction (FPF). By processing glass beads in a ball mill with different grinding materials (quartz and tungsten carbide) and varying grinding time (4 h and 8 h), and by plasma etching for 1 min, glass beads with different shades of surface roughness and increased surface area were prepared. Compared with untreated glass beads, the surface-modified rough glass beads show increased FPFs. The drug detachment from the modified glass beads is also more reproducible than from untreated glass beads indicated by lower standard deviations for the FPFs of the modified glass beads. Moreover, the FPF of the modified glass beads correlates with their surface characteristics. The higher the surface roughness and the higher the specific surface area of the glass beads the higher is the FPF. Thus, surface-modified glass beads make an ideal carrier for tailoring the performance of DPIs in the therapy of asthma and chronically obstructive pulmonary diseases.
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Affiliation(s)
- Sarah Zellnitz
- a Research Center Pharmaceutical Engineering GmbH , Graz , Austria and
| | - Hartmuth Schroettner
- b Austrian Centre for Electron Microscopy and Nanoanalysis, TU Graz , Graz , Austria
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Zellnitz S, Schroettner H, Urbanetz NA. Surface modified glass beads as model carriers in dry powder inhalers—Influence of drug load on the fine particle fraction. POWDER TECHNOL 2014. [DOI: 10.1016/j.powtec.2014.08.059] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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25
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Du P, Du J, Smyth HDC. Evaluation of granulated lactose as a carrier for DPI formulations 1: effect of granule size. AAPS PharmSciTech 2014; 15:1417-28. [PMID: 24962007 DOI: 10.1208/s12249-014-0166-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Accepted: 05/28/2014] [Indexed: 11/30/2022] Open
Abstract
The objective of this study was to investigate the effect of large granulated lactose carrier particle systems on aerosol performance of dry powder inhaler formulations. Granulated lactose carriers with average sizes ranging from 200 to 1,000 μm were prepared and subsequently fractionated into separate narrow size powders. The fractionated granulated lactose (GL) samples were characterized in terms of size, specific surface area, surface roughness, morphology, density, flowability, and solid-state. The in vitro aerosolization performance was performed on the different size fractions of GL samples from a commercial inhaler device (Aerolizer®) with a model formulation (2% w/w salbutamol sulfate). The cascade impaction parameters employed were 60 or 90 L/min with standard (aperture size, 0.6 mm) or modified piercing holes (aperture size, 1.2 mm) of the inhaler loaded capsules. It was shown that the largest size fraction formulation (850-1000 μm) had a slight improvement in the fine particle fraction (FPF) compared to immediately preceding size fractions, explained by a smaller adhesive force between drug and carrier. Compared to commercial piercing holes, enlarged piercing holes generated a slight decreasing trend of FPF as the lactose powder sizes increased from 200-250 μm to 600-850 μm, perhaps due to the reduced detachment force by flow forces. The size, surface roughness, density, and flowability of lactose carrier as well as device design all contributed to the aerosol dispersion performance of granulated lactose-based adhesive mixtures. It was concluded that poorer or enhanced redispersion performance is not an inherent property to the significantly large size of granulated lactose carriers as previously contended.
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Liquid crystalline phase as a probe for crystal engineering of lactose: carrier for pulmonary drug delivery. Eur J Pharm Sci 2014; 68:43-50. [PMID: 25460546 DOI: 10.1016/j.ejps.2014.11.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 11/14/2014] [Accepted: 11/14/2014] [Indexed: 11/21/2022]
Abstract
The current work was undertaken to assess suitability of liquid crystalline phase for engineering of lactose crystals and their utility as a carrier in dry powder inhalation formulations. Saturated lactose solution was poured in molten glyceryl monooleate which subsequently transformed into gel. The gel microstructure was analyzed by PPL microscopy and SAXS. Lactose particles recovered from gels after 48 h were analyzed for polymorphism using techniques such as FTIR, XRD, DSC and TGA. Particle size, morphology and aerosolisation properties of prepared lactose were analyzed using Anderson cascade impactor. In situ seeding followed by growth of lactose crystals took place in gels with cubic microstructure as revealed by PPL microscopy and SAXS. Elongated (size ∼ 71 μm) lactose particles with smooth surface containing mixture of α and β-lactose was recovered from gel, however percentage of α-lactose was more as compared to β-lactose. The aerosolisation parameters such as RD, ED, %FPF and % recovery of lactose recovered from gel (LPL) were found to be comparable to Respitose® ML001. Thus LC phase (cubic) can be used for engineering of lactose crystals so as to obtain particles with smooth surface, high elongation ratio and further they can be used as carrier in DPI formulations.
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27
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Wong SY, Hartel RW. Crystallization in lactose refining-a review. J Food Sci 2014; 79:R257-72. [PMID: 24517206 DOI: 10.1111/1750-3841.12349] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 12/02/2013] [Indexed: 11/30/2022]
Abstract
In the dairy industry, crystallization is an important separation process used in the refining of lactose from whey solutions. In the refining operation, lactose crystals are separated from the whey solution through nucleation, growth, and/or aggregation. The rate of crystallization is determined by the combined effect of crystallizer design, processing parameters, and impurities on the kinetics of the process. This review summarizes studies on lactose crystallization, including the mechanism, theory of crystallization, and the impact of various factors affecting the crystallization kinetics. In addition, an overview of the industrial crystallization operation highlights the problems faced by the lactose manufacturer. The approaches that are beneficial to the lactose manufacturer for process optimization or improvement are summarized in this review. Over the years, much knowledge has been acquired through extensive research. However, the industrial crystallization process is still far from optimized. Therefore, future effort should focus on transferring the new knowledge and technology to the dairy industry.
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Affiliation(s)
- Shin Yee Wong
- Dept. of Biological Systems Engineering, Univ. of Wisconsin, Madison, WI, 53706
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28
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Smith KB, Bridson RH, Leeke GA. Crystallisation control of paracetamol from ionic liquids. CrystEngComm 2014. [DOI: 10.1039/c4ce01796j] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The use of ionic liquids as a novel media for crystallisation and potential suitability for particle habit manipulation of paracetamol.
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Affiliation(s)
- K. B. Smith
- GlaxoSmithKline
- Gunnels Wood Road
- Stevenage
- Hertfordshire
- UK
| | - R. H. Bridson
- School of Chemical Engineering
- University of Birmingham
- Edgbaston
- Birmingham, UK
| | - G. A. Leeke
- School of Chemical Engineering
- University of Birmingham
- Edgbaston
- Birmingham, UK
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29
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Littringer EM, Noisternig MF, Mescher A, Schroettner H, Walzel P, Griesser UJ, Urbanetz NA. The morphology and various densities of spray dried mannitol. POWDER TECHNOL 2013. [DOI: 10.1016/j.powtec.2013.05.004] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Preparation and characterization of physically modified glass beads used as model carriers in dry powder inhalers. Int J Pharm 2013; 447:132-8. [DOI: 10.1016/j.ijpharm.2013.02.044] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 02/18/2013] [Accepted: 02/19/2013] [Indexed: 11/23/2022]
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Rahimpour Y, Hamishehkar H. Lactose engineering for better performance in dry powder inhalers. Adv Pharm Bull 2012; 2:183-7. [PMID: 24312791 DOI: 10.5681/apb.2012.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2012] [Accepted: 07/30/2012] [Indexed: 11/17/2022] Open
Abstract
Dry powder inhaler (DPI) is generally formulated as a powder mixture of coarse carrier particles and micronized drug with aerodynamic diameters of 1-5 μm. Carrier particles are used to improve drug particle flowability, thus improving dosing accuracy, minimizing the dose variability compared with drug alone and making them easier to handle during manufacturing operations. Lactose is the most common and frequently used carrier in DPIs formulations and nowadays various inhalation grades of lactose with different physico-chemical properties are available on the market. Therefore, the purpose of this manuscript is to review evolution of lactose as a carrier in inhalable formulations, their production and the impact of its physico-chemical properties on drug dispersion. This review offers a perspective on the current reported studies to modify lactose for better performance in DPIs.
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Affiliation(s)
- Yahya Rahimpour
- Biotechnology Research Center and Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
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32
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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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Maas SG, Schaldach G, Littringer EM, Mescher A, Griesser UJ, Braun DE, Walzel PE, Urbanetz NA. The impact of spray drying outlet temperature on the particle morphology of mannitol. POWDER TECHNOL 2011. [DOI: 10.1016/j.powtec.2011.06.024] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Crisp JL, Dann SE, Blatchford CG. Antisolvent crystallization of pharmaceutical excipients from aqueous solutions and the use of preferred orientation in phase identification by powder X-ray diffraction. Eur J Pharm Sci 2011; 42:568-77. [PMID: 21382490 DOI: 10.1016/j.ejps.2011.02.010] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2010] [Revised: 02/03/2011] [Accepted: 02/23/2011] [Indexed: 12/01/2022]
Abstract
Crystallization of lactose from 10% (w/v) aqueous solutions was investigated with the use of polar antisolvents. Crystal growth was observed at 50-65% antisolvent content and showed a morphological transition from a polyhedral to needle-like habit with increasing antisolvent content, which coincided with a polymorphic transition from alpha lactose monohydrate (Lα·H(2)O) to beta lactose (Lβ). Where dehydrating antisolvents were employed such as methanol and ethanol, evidence of Lα·H(2)O dehydration to form Lα(S) was also observed at 95% antisolvent content. Powder X-ray diffraction (PXRD) analysis of the crystals highlighted the preferred orientation effects exhibited by large crystals of this kind, indicating the difficulties experienced by the non-specialist when performing phase identification of lactose polymorphs. The same studies were applied to raffinose pentahydrate, trehalose dihydrate and mannitol to assess the effects of crystallization conditions on other pharmaceutical excipients.
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Affiliation(s)
- J L Crisp
- Department of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
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35
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Genina N, Räikkönen H, Heinämäki J, Antikainen O, Siiriä S, Veski P, Yliruusi J. Effective modification of particle surface properties using ultrasonic water mist. AAPS PharmSciTech 2009; 10:282-8. [PMID: 19288203 DOI: 10.1208/s12249-009-9208-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2008] [Accepted: 02/11/2009] [Indexed: 11/30/2022] Open
Abstract
The goal of the present study was to design a new technique to modify particle surface properties and, through that, to improve flowability of poorly flowing drug thiamine hydrochloride and pharmaceutical sugar lactose monohydrate of two different grades. The powdered particles were supplied by a vibratory feeder and exposed to an instantaneous effect of water mist generated from an ultrasound nebulizer. The processed and original powders were evaluated with respect to morphology (scanning electron microscopy, atomic force microscopy, and spatial filtering technique), flow, and solid state properties. It was found that rapid exposition of pharmaceutical materials by water mist resulted in the improvement of powder technical properties. The evident changes in flowability of coarser lactose were obviously due to smoothing of particle surface and decreasing in the level of fines with very slight increment in particle size. The changes in thiamine powder flow were mainly due to narrowing in particle size distribution where the tendency for better flow of finer lactose was related to surface and size modifications. The aqueous mist application did not cause any alteration of the crystal structures of the studied materials. The proposed water mist treatment technique appears to be a robust, rapid, and promising tool for the improvement of the technological properties of pharmaceutical powders.
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Packhaeuser CB, Lahnstein K, Sitterberg J, Schmehl T, Gessler T, Bakowsky U, Seeger W, Kissel T. Stabilization of Aerosolizable Nano-carriers by Freeze-Drying. Pharm Res 2008; 26:129-38. [DOI: 10.1007/s11095-008-9714-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2008] [Accepted: 08/19/2008] [Indexed: 11/28/2022]
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Dhumal RS, Biradar SV, Paradkar AR, York P. Ultrasound assisted engineering of lactose crystals. Pharm Res 2008; 25:2835-44. [PMID: 18592354 DOI: 10.1007/s11095-008-9653-9] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2008] [Accepted: 06/04/2008] [Indexed: 11/27/2022]
Abstract
PURPOSE To engineer lactose crystals of desired size, shape, surface and particle size distribution (PSD) as a carrier for dry powder inhalers (DPI) by ultrasound assisted in-situ seeding. METHODS Lactose crystals were obtained from solution by ultrasound assisted in-situ seeding, followed by growth in viscous glycerin solution. The crystals were characterized for physical properties and 63-90 mum size fractions of different batches were mixed with salbutamol sulphate (SS) and compared for in-vitro deposition. RESULTS Cooling crystallization with stirring for 10-20 h resulted in crystals with wide PSD and varied shape. Application of ultrasound resulted in rapid and complete crystallization in 5 min with rod-shaped fine crystals (15-30 microm) and narrow PSD. In-situ seeded batches yielded micro-fine rod-shaped seed crystals. Seeding followed by growth in glycerin showed desirable size, high elongation ratio, smooth surface and narrow PSD, while growth under stirring showed high elongation ratio with rough surface. Crystals grown in glycerin showed highest dispersibility and fine particle fraction (FPF) of SS. CONCLUSIONS Ultrasound assisted in-situ seeding, followed by ordered growth in glycerin offers rapid technique for separation of nuclei induction from crystal growth yielding desirable characteristics for better dispersion and in-vitro deposition when employed as DPI carrier.
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Affiliation(s)
- Ravindra S Dhumal
- Department of Pharmaceutics, Bharati Vidyapeeth University, Poona College of Pharmacy and Research Centre, Erandawane, Pune, Maharashtra, India
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Dickhoff B, de Boer A, Lambregts D, Frijlink H. The interaction between carrier rugosity and carrier payload, and its effect on drug particle redispersion from adhesive mixtures during inhalation. Eur J Pharm Biopharm 2005; 59:197-205. [DOI: 10.1016/j.ejpb.2004.07.005] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2004] [Accepted: 07/08/2004] [Indexed: 11/29/2022]
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Price R, Young PM, Edge S, Staniforth JN. The influence of relative humidity on particulate interactions in carrier-based dry powder inhaler formulations. Int J Pharm 2002; 246:47-59. [PMID: 12270608 DOI: 10.1016/s0378-5173(02)00359-9] [Citation(s) in RCA: 122] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An atomic force microscope (AFM) colloid probe technique has been used to investigate the effect of relative humidity (RH) on the adhesion properties of pharmaceutical powder surfaces. The adhesion between a model substrate, alpha-lactose monohydrate, and model particulate drugs, salbutamol sulphate and budesonide, was investigated between RHs of 15 and 75%. The surface topography of the model alpha-lactose monohydrate was produced by controlling the supersaturation conditions during crystal growth to produce sub-nanometre scale roughness. The adhesion interactions between lactose and drug probes of salbutamol sulphate and budesonide were shown to be significantly increased with each incremental rise in humidity. Capillary forces were significantly more dominant for the adhesion in the budesonide-lactose system up to 60% RH but were more dominant for salbutamol sulphate-lactose above 60% RH. These studies suggested that non-surface-specific capillary forces play a dominant role in the adhesion between drug and carrier, which may significantly reduce the deaggregation and dispersion properties of a dry powder formulation.
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Affiliation(s)
- R Price
- Pharmaceutical Technology Research Group, Department of Pharmacy and Pharmacology, University of Bath, UK.
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41
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Zeng XM, Martin GP, Marriott C, Pritchard J. The effects of carrier size and morphology on the dispersion of salbutamol sulphate after aerosolization at different flow rates. J Pharm Pharmacol 2000; 52:1211-21. [PMID: 11092565 DOI: 10.1211/0022357001777342] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
We have investigated the interdependence of various factors (particle size, surface smoothness, carrier particle shape, inhalation flow rate) on the deposition of a model drug (salbutamol sulphate) after aerosolization from a model inhaler device (Rotahaler). Different batches of alpha-lactose monohydrate were prepared to have different particle size, particle shape and surface smoothness. Each batch of lactose was then mixed separately with salbutamol sulphate in a ratio of 67.5 : 1 (w/w), under similar conditions. Drug deposition from each formulation was investigated using a 4-stage liquid impinger after aerosolization at 28.3, 60.0 and 96.0 L min(-1) via a Rotahaler. At a flow rate of 28.3 L min(-1), a large portion of drug particles was not emitted from the inhaler, the % emission varying from 29.6% to 66.6% for all formulations investigated. Drug emission tended to increase with particle size of the carrier whilst fine particle fraction, fine particle dose and dispersibility appeared to increase with decreasing particle size but increasing elongation ratio of the carrier particles. Increasing the flow rate to 60.0 L min(-1) was shown to increase drug emission since > 75% total dose was found to be emitted from the inhaler. Again, smaller or more elongated lactose particles resulted in a higher fine particle dose or fine particle fraction of salbutamol sulphate than the coarser carrier, although they produced a similar (analysis of variance P > 0.05) drug emission. Increasing the flow rate to 96.0 L min(-1) did not increase drug emission. Increasing the flow rate resulted in an increase in the fine particle fraction and fine particle dose of salbutamol sulphate from all formulations. The flow rate of the airstream appeared to play the most important role, followed by particle size and elongation ratio of the carrier particles, with the surface smoothness relatively less significant in determining the deposition of salbutamol sulphate from the Rotahaler.
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Affiliation(s)
- X M Zeng
- Department of Pharmacy, King's College London, UK
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