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Hu C, Yan Q, Zhang Y, Yan H. Influence Mechanism of Drug-Polymer Compatibility on Humidity Stability of Crystalline Solid Dispersion. Pharmaceuticals (Basel) 2023; 16:1640. [PMID: 38139767 PMCID: PMC10747292 DOI: 10.3390/ph16121640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 11/17/2023] [Accepted: 11/19/2023] [Indexed: 12/24/2023] Open
Abstract
This study investigates the influence of humidity on the dissolution behavior and microstructure of drugs in crystalline solid dispersions (CSDs). Using Bifonazole (BFZ) as a model drug, CSDs were prepared through spray drying with carriers such as Poloxamer 188 (P188), Poloxamer 407 (P407), and polyethylene glycol 8000 (PEG8000). The solubilization effect and mechanism were initially evaluated, followed by an examination of the impact of humidity (RH10%) on the dissolution behavior of CSDs. Furthermore, the influence of humidity on the microstructure of CSDs was investigated, and factors affecting the humidity stability of CSDs were summarized. Significant enhancements in the intrinsic dissolution rate (IDR) of BFZ in CSDs were observed due to changes in crystalline size and crystallinity, with the CSD-P188 system exhibiting the best performance. Following humidity treatment, the CSD-P407 system demonstrated the least change in the IDR of BFZ, indicating superior stability. The CSD-P407 system was followed by the CSD-P188 system, with the CSD-PEG8000 system exhibiting the least stability. Further analysis of the microstructure revealed that while humidity had negligible effects on the crystalline size and crystallinity of BFZ in CSDs, it had a significant impact on the distribution of BFZ on the CSD surface. This can be attributed to the water's potent plasticizing effect, which significantly alters the molecular mobility of BFZ. Additionally, the compatibility of the three polymers with BFZ differs, with CSD-P407 > CSD-P188 > CSD-PEG8000. Under the continuous influence of water, stronger compatibility leads to lower molecular mobility and more uniform drug distribution on the CSD surface. Enhancing the compatibility of drugs with polymers can effectively reduce the mobility of BFZ in CSDs, thereby mitigating changes caused by water and ultimately stabilizing the surface composition and dissolution behavior of drugs in CSDs.
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Affiliation(s)
- Chunhui Hu
- State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810001, China
| | - Qiuli Yan
- Medical College, Qinghai University, Xining 810001, China; (Q.Y.); (Y.Z.); (H.Y.)
| | - Yong Zhang
- Medical College, Qinghai University, Xining 810001, China; (Q.Y.); (Y.Z.); (H.Y.)
| | - Haiying Yan
- Medical College, Qinghai University, Xining 810001, China; (Q.Y.); (Y.Z.); (H.Y.)
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2
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Jain A, King D, Pontrelli G, McGinty S. Controlling release from encapsulated drug-loaded devices: insights from modeling the dissolution front propagation. J Control Release 2023; 360:225-235. [PMID: 37328006 DOI: 10.1016/j.jconrel.2023.06.019] [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: 02/14/2023] [Revised: 06/12/2023] [Accepted: 06/13/2023] [Indexed: 06/18/2023]
Abstract
Dissolution of drug from its solid form to a dissolved form is an important consideration in the design and optimization of drug delivery devices, particularly owing to the abundance of emerging compounds that are extremely poorly soluble. When the solid dosage form is encapsulated, for example by the porous walls of an implant, the impact of the encapsulant drug transport properties is a further confounding issue. In such a case, dissolution and diffusion work in tandem to control the release of drug. However, the interplay between these two competing processes in the context of drug delivery is not as well understood as it is for other mass transfer problems, particularly for practical controlled-release considerations such as an encapsulant layer around the drug delivery device. To address this gap, this work presents a mathematical model that describes controlled release from a drug-loaded device surrounded by a passive porous layer. A solution for the drug concentration distribution is derived using the method of eigenfunction expansion. The model is able to track the dissolution front propagation, and predict the drug release curve during the dissolution process. The utility of the model is demonstrated through comparison against experimental data representing drug release from a cylindrical drug-loaded orthopedic fixation pin, where the model is shown to capture the data very well. Analysis presented here reveals how the various geometrical and physicochemical parameters influence drug dissolution and, ultimately, the drug release profile. It is found that the non-dimensional initial concentration plays a key role in determining whether the problem is diffusion-limited or dissolution-limited, whereas the nature of the problem is largely independent of other parameters including diffusion coefficient and encapsulant thickness. We expect the model will prove to be a useful tool for those designing encapsulated drug delivery devices, in terms of optimizing the design of the device to achieve a desired drug release profile.
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Affiliation(s)
- Ankur Jain
- Mechanical and Aerospace Engineering Department, University of Texas at Arlington, Arlington, TX, USA.
| | - David King
- School of Mathematics & Statistics, University of Glasgow, Glasgow, UK
| | - Giuseppe Pontrelli
- Istituto per le Applicazioni del Calcolo - CNR Via dei Taurini 19, Rome 00185, Italy
| | - Sean McGinty
- Division of Biomedical Engineering, University of Glasgow, Glasgow, UK; Glasgow Computational Engineering Centre, University of Glasgow, Glasgow, UK.
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3
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Bertoni S, Albertini B, Passerini N. Investigating the physicochemical properties of solid dispersions based on semicrystalline carriers: A case study with ketoprofen. Int J Pharm 2023; 632:122576. [PMID: 36596317 DOI: 10.1016/j.ijpharm.2022.122576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 12/28/2022] [Accepted: 12/29/2022] [Indexed: 01/01/2023]
Abstract
Hydrophilic semicrystalline carriers represent an alternative to amorphous polymers due to their low melting temperature, useful for the production of solid dispersions (SDs) by melting-based technologies. This research aims to compare SDs of ketoprofen (KET) and three different semicrystalline carriers (PEG, Poloxamer and Gelucire) regarding miscibility, phase behavior, molecular interactions and stability. KET was chosen owing to its low solubility and high glass forming ability. Estimation of drug-excipient miscibility was performed by Flory-Huggins theory. Negative Gibbs free energy indicated a spontaneous mixing of KET with the three carriers and miscibility in the order PEG > Poloxamer > Gelucire. SDs up to 40 % w/w of drug were produced by melting process at a temperature below KET melting point. Characterization of SDs was performed by differential scanning calorimetry, polarized light microscopy and powder X-ray diffraction. In case of PEG and Poloxamer, the drug incorporation did not affect carrier crystallinity, while KET was in the amorphous state. Differently, KET retarded the crystallization of Gelucire and at high drug loadings the SDs were amorphous and semisolid. FT-IR analysis revealed a strong interaction between KET and the three carriers. Finally, PEG-based SDs above 20 % KET loading displayed drug crystallization after 6 months of storage; while Poloxamer and Gelucire-based SDs showed KET crystallization only at 40 % KET. Due to its less hydrophilic character and limited water uptake, Gelucire showed the best stability among the three excipients.
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Affiliation(s)
- Serena Bertoni
- Department of Pharmacy and BioTechnology, PharmTech Lab, Alma Mater Studiorum-University of Bologna, Via S. Donato 19/2, 40127 Bologna, Italy
| | - Beatrice Albertini
- Department of Pharmacy and BioTechnology, PharmTech Lab, Alma Mater Studiorum-University of Bologna, Via S. Donato 19/2, 40127 Bologna, Italy
| | - Nadia Passerini
- Department of Pharmacy and BioTechnology, PharmTech Lab, Alma Mater Studiorum-University of Bologna, Via S. Donato 19/2, 40127 Bologna, Italy.
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4
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Gao D, Zhu D, Zhou X, Dong S, Chen Y. Inhomogeneous Phase Significantly Reduces Oral Bioavailability of Felodipine/PVPVA Amorphous Solid Dispersion. Mol Pharm 2023; 20:409-418. [PMID: 36529939 DOI: 10.1021/acs.molpharmaceut.2c00695] [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: 12/23/2022]
Abstract
Inhomogeneity is a key factor that significantly influences the dissolution behavior of amorphous solid dispersion (ASD). However, the underlying mechanisms of the effects of inhomogeneous phase on the dissolution characteristics as well as the bioavailability of ASDs are still unclear. In this study, two types of felodipine/PVPVA based ASDs with 30 wt % drug loading but different homogeneity were prepared: homogeneous "30 wt % ASD" prepared by spray drying, as well as inhomogeneous "30 wt % PM" prepared by physically mixing the sprayed dried 70 wt % ASD with PVPVA. We aimed to investigate (1) drug-polymer interaction mechanism and "apparent" interaction strength within the two ASDs and (2) dissolution mechanism as well as in vivo performance of the two ASDs. DSC thermogram revealing a single Tg in 30 wt % ASD confirmed its homogeneous phase. 1H NMR, FT-IR, and DVS studies collectively proved that strong hydrogen bonding interactions formed between felodipine and PVPVA in ASDs. Moreover, homogeneous "30 wt % ASD" has more numbers of interacting drug-polymer pairs, and thus exhibits stronger "apparent" interaction strength comparing with that of inhomogeneous "30 wt % PM". Unexpectedly,in the in vitro dissolution studies, inhomogeneous "30 wt % PM" showed much faster dissolution and also generated drug concentration ∼4.4 times higher than that of homogeneous "30 wt % ASD". However, drug precipitate recrystallized much slower in homogeneous "30 wt % ASD", presumably because much more polymer coprecipitated with amorphous drug in this system, which helps inhibiting drug crystallization. Surprisingly, homogeneous "30 wt % ASD" showed a significantly higher bioavailability in the in vivo pharmacokinetic studies, with the maximum plasma concentrations (Cmax) and the area under the curve (AUC) values of about 2.7 and 2.3 times higher than those of inhomogeneous "30 wt % PM". The above findings indicated that the amorphous state of drug precipitate contributes significantly to increase bioavailability of ASDs, while traditional in vitro dissolution studies, for instance, if we only compare the dissolved drug in solution or the capability of an ASD to generate supersaturation, are inadequate to predict in vivo performance of ASDs. In conclusion, the phase behavior of ASDs directly impact the formation of drug-polymer interaction, which controls not only drug supersaturation in solution but also drug crystallization in precipitate, and ultimately affect the in vivo performance of ASDs.
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Affiliation(s)
- Di Gao
- School of Pharmacy, Minzu University of China, 100081 Beijing, China
| | - Dan Zhu
- School of Pharmacy, Minzu University of China, 100081 Beijing, China
| | - Xue Zhou
- Chengdu Institute of Biology, Chinese Academy of Sciences, 610000 Chengdu, China
| | - Shuai Dong
- School of Pharmacy, Minzu University of China, 100081 Beijing, China
| | - Yuejie Chen
- School of Pharmacy, Minzu University of China, 100081 Beijing, China.,Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), State Ethnic Affairs Commission, 100081 Beijing, China
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5
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Selective Impact of MTMS-Based Xerogel Morphology on Boosted Proliferation and Enhanced Naphthoquinone Production in Cultures of Rindera graeca Transgenic Roots. Int J Mol Sci 2022; 23:ijms232213669. [PMID: 36430149 PMCID: PMC9691030 DOI: 10.3390/ijms232213669] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 11/02/2022] [Accepted: 11/03/2022] [Indexed: 11/09/2022] Open
Abstract
In situ extraction is a method for separating plant secondary metabolites from in vitro systems of plant biomass cultures. The study aimed to investigate the MTMS-based xerogels morphology effect on the growth kinetics and deoxyshikonin productivity in xerogel-supported in vitro culture systems of Rindera graeca hairy root. Cultures were supplemented with three types of xerogel, i.e., mesoporous gel, microporous gel, and agglomerated precipitate, in the disintegrated or monolithic form. Structure, oil sorption capacity, and SEM analyses for xerogel-based additives were performed. Application of monolithic macroporous xerogel resulted in the highest biomass proliferation, i.e., 5.11-fold fresh biomass increase after four weeks of the screening culture. The highest deoxyshikonin production (i.e., 105.03 µg) was noted when hairy roots were maintained with particles of disintegrated mesoporous xerogel. The detailed kinetics investigations (6-week culture) revealed the highest growth of hairy root biomass and secondary metabolite production, equaling 9.46-fold fresh weight biomass and 204.08 µg deoxyshikonin, respectively. MTMS-based xerogels have been recognized as selective biocompatible scaffolds for boosting the proliferation of transgenic roots or for productivity enhancement of naphthoquinones without detrimental effects on biomass growth, and their successful applicability in in situ removal of secondary plant metabolites has been experimentally confirmed.
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6
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Anane-Adjei AB, Jacobs E, Nash SC, Askin S, Soundararajan R, Kyobula M, Booth J, Campbell A. Amorphous Solid Dispersions: Utilization and Challenges in Preclinical Drug Development within AstraZeneca. Int J Pharm 2021; 614:121387. [PMID: 34933082 DOI: 10.1016/j.ijpharm.2021.121387] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 11/23/2021] [Accepted: 12/12/2021] [Indexed: 01/04/2023]
Abstract
The poor aqueous solubility of many active pharmaceutical ingredients (APIs) dominates much of the early drug development portfolio and poses a major challenge in pharmaceutical development. Polymer-based amorphous solid dispersions (ASDs) are becoming increasingly common and offer a promising formulation strategy to tackle the solubility and oral absorption issues of these APIs. This review discusses the design, manufacture, and utilisation of ASD formulations in preclinical drug development, with a key focus on the pre-formulation assessments and workflows employed at AstraZeneca.
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Affiliation(s)
- Akosua B Anane-Adjei
- Advanced Drug Delivery, Pharmaceutical Sciences, R&D AstraZeneca, Granta Park, Cambridge, CB21 6GH, UK
| | - Esther Jacobs
- Advanced Drug Delivery, Pharmaceutical Sciences, R&D AstraZeneca, Granta Park, Cambridge, CB21 6GH, UK
| | - Samuel C Nash
- Advanced Drug Delivery, Pharmaceutical Sciences, R&D AstraZeneca, Granta Park, Cambridge, CB21 6GH, UK
| | - Sean Askin
- Advanced Drug Delivery, Pharmaceutical Sciences, R&D AstraZeneca, Granta Park, Cambridge, CB21 6GH, UK
| | - Ramesh Soundararajan
- Advanced Drug Delivery, Pharmaceutical Sciences, R&D AstraZeneca, Granta Park, Cambridge, CB21 6GH, UK
| | - Mary Kyobula
- Advanced Drug Delivery, Pharmaceutical Sciences, R&D AstraZeneca, Granta Park, Cambridge, CB21 6GH, UK
| | - Jonathan Booth
- Pharmaceutical Technology & Development, AstraZeneca, Charter Way, Macclesfield, SK10 2NA, UK
| | - Andrew Campbell
- Advanced Drug Delivery, Pharmaceutical Sciences, R&D AstraZeneca, Granta Park, Cambridge, CB21 6GH, UK.
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7
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Kapourani A, Palamidi A, Kontogiannopoulos KN, Bikiaris ND, Barmpalexis P. Drug Amorphous Solid Dispersions Based on Poly(vinyl Alcohol): Evaluating the Effect of Poly(propylene Succinate) as Plasticizer. Polymers (Basel) 2021; 13:polym13172922. [PMID: 34502962 PMCID: PMC8434550 DOI: 10.3390/polym13172922] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 08/24/2021] [Accepted: 08/27/2021] [Indexed: 02/03/2023] Open
Abstract
Although significant actions have been taken towards the utilization of poly(vinyl alcohol) (PVA) in the preparation of drug amorphous solid dispersions (ASDs) using fusion-based techniques (such as melt-quench cooling and hot-melt extrusion), several drawbacks regarding its rather high melting temperature and its thermal degradation profile make the use of the polymer extremely challenging. This is especially important when the active pharmaceutical ingredient (API) has a lower melting temperature (than PVA) or when it is thermally labile. In this vein, a previous study showed that newly synthesized polyester-based plasticizers may improve the processability and the thermal properties of PVA. However, the effects of such polyester-based plasticizers on the drug’s physicochemical and pharmaco-technical properties are yet unknown. Hence, the aim of the present study is to extend our previous findings and evaluate the use of poly(propylene succinate) (PPSu, i.e., the most promising plasticizer in regard to PVA) in the preparation of drug-loaded PVA-based ASDs. Dronedarone (DRN), a poorly water-soluble API, was selected as a model drug, and drug ASDs (using either neat PVA or PVA-PPSu) were prepared using the melt-mixing/quench cooling approach at low melting temperatures (i.e., 170 °C). DSC and pXRD analysis showed that a portion of the API remained crystalline in the ASDs prepared only with the use of neat PVA, while the samples having PPSu as a plasticizer were completely amorphous. Further evaluation with ATR-FTIR spectroscopy revealed the formation of significant intermolecular interactions between the API and the PVA-PPSu matrix, which could explain the system’s physical stability during storage. Finally, dissolution studies, conducted under nonsink conditions, revealed that the use of PVA-PPSu is able to maintain DRN’s sustained supersaturation for up to 8 h.
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Affiliation(s)
- Afroditi Kapourani
- Department of Pharmaceutical Technology, School of Pharmacy, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (A.K.); (A.P.); (K.N.K.)
| | - Artemis Palamidi
- Department of Pharmaceutical Technology, School of Pharmacy, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (A.K.); (A.P.); (K.N.K.)
- Laboratory of Polymer Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;
| | - Konstantinos N. Kontogiannopoulos
- Department of Pharmaceutical Technology, School of Pharmacy, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (A.K.); (A.P.); (K.N.K.)
| | - Nikolaos D. Bikiaris
- Laboratory of Polymer Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;
| | - Panagiotis Barmpalexis
- Department of Pharmaceutical Technology, School of Pharmacy, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (A.K.); (A.P.); (K.N.K.)
- Natural Products Research Centre of Excellence-AUTH (NatPro-AUTH), Center for Interdisciplinary Research and Innovation (CIRI-AUTH), 57001 Thessaloniki, Greece
- Correspondence:
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8
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Ordoubadi M, Gregson FKA, Wang H, Carrigy NB, Nicholas M, Gracin S, Lechuga-Ballesteros D, Reid JP, Finlay WH, Vehring R. Trileucine as a dispersibility enhancer of spray-dried inhalable microparticles. J Control Release 2021; 336:522-536. [PMID: 34229002 DOI: 10.1016/j.jconrel.2021.06.045] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Accepted: 06/28/2021] [Indexed: 11/16/2022]
Abstract
The formation of trileucine-containing spray-dried microparticles intended for pulmonary delivery was studied in depth. A single-particle method was employed to study the shell formation characteristics of trileucine in the presence of trehalose as a glass former, and an empirical correlation was proposed to predict the instance of shell formation. A droplet chain instrument was used to produce and collect monodisperse particles to examine morphology and calculate particle density for different levels of trileucine. It was observed that the addition of only 0.5 mg/mL (10% w/w) trileucine to a trehalose system could lower dried particle densities by approximately 1 g/cm3. In addition, a laboratory-scale spray dryer was used to produce batches of trileucine/trehalose powders in the respirable range. Raman spectroscopy demonstrated that both components were completely amorphous. Scanning electron microscopy and time-of-flight secondary ion mass spectrometry were used to study the particle morphologies and surface compositions. For all cases with trileucine, highly rugose particles with trileucine coverages of more than 60% by mass were observed with trileucine feed fractions of as little as 2% w/w. Moreover, it was seen that at lower trileucine content, smaller and larger particles of a polydisperse powder had slightly different surface compositions. The surface activity of trileucine was also modeled via a modified form of the diffusion equation inside an evaporating droplet that took into account initial surface adsorption and eventual surface desorption due to droplet shrinkage. Finally, using the Flory-Huggins theory, it was estimated that at room temperature, liquid-liquid phase separation would start when the trileucine reached an aqueous concentration of about 18 mg/mL. Besides the surface activity of trileucine, this low concentration was assumed to explain the substantial effect of trileucine on the morphology of spray-dried particles due to early phase separation. The methodology proposed in this study can be used in the rational design of trileucine-containing microparticles.
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Affiliation(s)
- Mani Ordoubadi
- Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada
| | | | - Hui Wang
- Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada
| | - Nicholas B Carrigy
- Inhalation Product Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, South San Francisco, California, USA
| | - Mark Nicholas
- Inhalation Product Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Gothenburg, Sweden
| | - Sandra Gracin
- Inhalation Product Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Gothenburg, Sweden
| | - David Lechuga-Ballesteros
- Inhalation Product Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, South San Francisco, California, USA
| | - Jonathan P Reid
- School of Chemistry, University of Bristol, Bristol, United Kingdom
| | - Warren H Finlay
- Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada
| | - Reinhard Vehring
- Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada.
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9
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Qian K, Stella L, Jones DS, Andrews GP, Du H, Tian Y. Drug-Rich Phases Induced by Amorphous Solid Dispersion: Arbitrary or Intentional Goal in Oral Drug Delivery? Pharmaceutics 2021; 13:889. [PMID: 34203969 PMCID: PMC8232734 DOI: 10.3390/pharmaceutics13060889] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 06/08/2021] [Accepted: 06/10/2021] [Indexed: 12/19/2022] Open
Abstract
Among many methods to mitigate the solubility limitations of drug compounds, amorphous solid dispersion (ASD) is considered to be one of the most promising strategies to enhance the dissolution and bioavailability of poorly water-soluble drugs. The enhancement of ASD in the oral absorption of drugs has been mainly attributed to the high apparent drug solubility during the dissolution. In the last decade, with the implementations of new knowledge and advanced analytical techniques, a drug-rich transient metastable phase was frequently highlighted within the supersaturation stage of the ASD dissolution. The extended drug absorption and bioavailability enhancement may be attributed to the metastability of such drug-rich phases. In this paper, we have reviewed (i) the possible theory behind the formation and stabilization of such metastable drug-rich phases, with a focus on non-classical nucleation; (ii) the additional benefits of the ASD-induced drug-rich phases for bioavailability enhancements. It is envisaged that a greater understanding of the non-classical nucleation theory and its application on the ASD design might accelerate the drug product development process in the future.
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Affiliation(s)
- Kaijie Qian
- Pharmaceutical Engineering Group, School of Pharmacy, Queen’s University Belfast, 97 Lisburn Road, Belfast BT9 7BL, UK; (K.Q.); (D.S.J.); (G.P.A.)
| | - Lorenzo Stella
- Atomistic Simulation Centre, School of Mathematics and Physics, Queen’s University Belfast, 7–9 College Park E, Belfast BT7 1PS, UK;
- David Keir Building, School of Chemistry and Chemical Engineering, Queen’s University Belfast, Stranmillis Road, Belfast BT9 5AG, UK
| | - David S. Jones
- Pharmaceutical Engineering Group, School of Pharmacy, Queen’s University Belfast, 97 Lisburn Road, Belfast BT9 7BL, UK; (K.Q.); (D.S.J.); (G.P.A.)
| | - Gavin P. Andrews
- Pharmaceutical Engineering Group, School of Pharmacy, Queen’s University Belfast, 97 Lisburn Road, Belfast BT9 7BL, UK; (K.Q.); (D.S.J.); (G.P.A.)
- School of Pharmacy, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang 110122, China
| | - Huachuan Du
- Laboratory of Applied Mechanobiology, Department of Health Sciences and Technology, ETH Zurich, Vladimir-Prelog-Weg 4, 8093 Zurich, Switzerland
- Simpson Querrey Institute, Northwestern University, 303 East Superior Street, 11th floor, Chicago, IL 60611, USA
| | - Yiwei Tian
- Pharmaceutical Engineering Group, School of Pharmacy, Queen’s University Belfast, 97 Lisburn Road, Belfast BT9 7BL, UK; (K.Q.); (D.S.J.); (G.P.A.)
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10
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Kapourani A, Eleftheriadou K, Kontogiannopoulos KN, Barmpalexis P. Evaluation of rivaroxaban amorphous solid dispersions physical stability via molecular mobility studies and molecular simulations. Eur J Pharm Sci 2021; 157:105642. [PMID: 33189903 DOI: 10.1016/j.ejps.2020.105642] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 11/08/2020] [Accepted: 11/09/2020] [Indexed: 11/30/2022]
Abstract
The present study evaluates the effect of molecular mobility and molecular interactions in the physical stability of rivaroxaban (RIV) - soluplus® (SOL) amorphous solid dispersions (ASDs). Initially, the use of Adam-Gibbs approach revealed that RIV's molecular mobility (below its glass transition temperature) is significantly reduced in the presence of SOL, while the use of ATR-FTIR spectroscopy showed the formation of hydrogen bonds (HBs) between the two ASD components, indicating that these two mechanisms can be considered as responsible for system's physical stability. Contrary to previously published reports, the utilization of ATR-FTIR spectroscopy in the present study was able to clarify, for the first time, the type of intermolecular interactions formed within the examined ASD system, while the presence of a separate drug-rich amorphous phase (significantly increasing as the content of the drug increases) was also identified. Furthermore, in order to gain an insight into the intermolecular interactions responsible for drug's amorphous phase separation, molecular dynamics (MD) simulation models were utilized as realistic representations of the actual systems. Analysis of the obtained trajectories showed that the formation of strong intermolecular HBs between RIV's secondary amide proton and its three carbonyl oxygens (originating from the οxazolidone, oxomorpholin and carboxamide part of the drug molecule) as well as the significant reduction of the available HB acceptors in SOL due to copolymer's chain shrinkage, were responsible for the formation of a separate drug-rich amorphous phase within the ASD.
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Affiliation(s)
- Afroditi Kapourani
- Department of Pharmaceutical Technology, School of Pharmacy, Aristotle University of Thessaloniki, Thessaloniki 54124 (Greece)
| | - Kalliopi Eleftheriadou
- Department of Pharmaceutical Technology, School of Pharmacy, Aristotle University of Thessaloniki, Thessaloniki 54124 (Greece)
| | - Konstantinos N Kontogiannopoulos
- Department of Pharmaceutical Technology, School of Pharmacy, Aristotle University of Thessaloniki, Thessaloniki 54124 (Greece); Ecoresources P.C., 15-17 Giannitson-Santaroza Str., Thessaloniki 54627 (Greece)
| | - Panagiotis Barmpalexis
- Department of Pharmaceutical Technology, School of Pharmacy, Aristotle University of Thessaloniki, Thessaloniki 54124 (Greece).
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11
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Zhang Z, Dong L, Guo J, Li L, Tian B, Zhao Q, Yang J. Prediction of the physical stability of amorphous solid dispersions: relationship of aging and phase separation with the thermodynamic and kinetic models along with characterization techniques. Expert Opin Drug Deliv 2020; 18:249-264. [PMID: 33112679 DOI: 10.1080/17425247.2021.1844181] [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] [Indexed: 12/23/2022]
Abstract
Introduction: Solid dispersion has been considered to be one of the most promising methods for improving the solubility and bioavailability of insoluble drugs. However, the physical stability of solid dispersions (SDs), including its aging and recrystallization, or phase separation, has always been one of the most challenging problems in the process of formulation development and storage.Areas covered: The high energy state of SDs is one of the primary reasons for the poor physical stability. The factors affecting the physical stability of SDs have been described from the perspective of thermodynamics and kinetics, and the corresponding theoretical model is put forward. We briefly summarize several commonly used techniques to characterize the thermodynamic and kinetic properties of SDs. Specific measures to improve the physical stability of SDs have been proposed from the perspective of prescription screening, process parameters, and storage conditions.Expert opinion: The separation of the drug from the polymer, the formation, and migration of drug crystals will cause the SDs to shift toward the direction of energy reduction, which is the intrinsic cause of instability. Furthermore, computational simulation can be used for efficient and rapid screening suitable for the excipients to improve the physical stability of SDs.
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Affiliation(s)
- Zhaoyang Zhang
- Department of Pharmaceutics, School of Pharmacy, Ningxia Medical University, Yinchuan, People's Republic of China
| | - Luning Dong
- Department of Pharmaceutics, School of Pharmacy, Ningxia Medical University, Yinchuan, People's Republic of China
| | - Jueshuo Guo
- Department of Pharmaceutics, School of Pharmacy, Ningxia Medical University, Yinchuan, People's Republic of China
| | - Li Li
- Department of Pharmaceutics, School of Pharmacy, Ningxia Medical University, Yinchuan, People's Republic of China
| | - Bin Tian
- Department of Pharmaceutical Sciences, School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an, People's Republic of China
| | - Qipeng Zhao
- Department of Pharmacology, School of Pharmacy, Ningxia Medical University, Yinchuan, People's Republic of China
| | - Jianhong Yang
- Department of Pharmaceutics, School of Pharmacy, Ningxia Medical University, Yinchuan, People's Republic of China
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Tran PH, Tran TT. Dosage form designs for the controlled drug release of solid dispersions. Int J Pharm 2020; 581:119274. [DOI: 10.1016/j.ijpharm.2020.119274] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 03/01/2020] [Accepted: 03/25/2020] [Indexed: 12/20/2022]
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Katopodis K, Kapourani A, Vardaka E, Karagianni A, Chorianopoulou C, Kontogiannopoulos KN, Bikiaris DN, Kachrimanis K, Barmpalexis P. Partially hydrolyzed polyvinyl alcohol for fusion-based pharmaceutical formulation processes: Evaluation of suitable plasticizers. Int J Pharm 2020; 578:119121. [DOI: 10.1016/j.ijpharm.2020.119121] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2019] [Revised: 02/02/2020] [Accepted: 02/04/2020] [Indexed: 01/12/2023]
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Ricarte RG, Van Zee NJ, Li Z, Johnson LM, Lodge TP, Hillmyer MA. Recent Advances in Understanding the Micro- and Nanoscale Phenomena of Amorphous Solid Dispersions. Mol Pharm 2019; 16:4089-4103. [PMID: 31487183 DOI: 10.1021/acs.molpharmaceut.9b00601] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Many pharmaceutical drugs in the marketplace and discovery pipeline suffer from poor aqueous solubility, thereby limiting their effectiveness for oral delivery. The use of an amorphous solid dispersion (ASD), a mixture of an active pharmaceutical ingredient and a polymer excipient, greatly enhances the aqueous dissolution performance of a drug without the need for chemical modification. Although this method is versatile and scalable, deficient understanding of the interactions between drugs and polymers inhibits ASD rational design. This current Review details recent progress in understanding the mechanisms that control ASD performance. In the solid-state, the use of high-resolution theoretical, computational, and experimental tools resolved the influence of drug/polymer phase behavior and dynamics on stability during storage. During dissolution in aqueous media, novel characterization methods revealed that ASDs can form complex nanostructures, which maintain and improve supersaturation of the drug. The studies discussed here illustrate that nanoscale phenomena, which have been directly observed and quantified, strongly affect the stability and bioavailability of ASD systems, and provide a promising direction for optimizing drug/polymer formulations.
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Affiliation(s)
- Ralm G Ricarte
- Molecular, Macromolecular Chemistry, and Materials Laboratory, CNRS, ESPCI-Paris , PSL Research University , 10 Rue Vauquelin , 75005 Paris , France
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Tian Y, Qian K, Jacobs E, Amstad E, Jones DS, Stella L, Andrews GP. The Investigation of Flory-Huggins Interaction Parameters for Amorphous Solid Dispersion Across the Entire Temperature and Composition Range. Pharmaceutics 2019; 11:pharmaceutics11080420. [PMID: 31430958 PMCID: PMC6722828 DOI: 10.3390/pharmaceutics11080420] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 08/11/2019] [Accepted: 08/13/2019] [Indexed: 02/06/2023] Open
Abstract
Amorphous solid dispersion (ASD) is one of the most promising enabling formulations featuring significant water solubility and bioavailability enhancements for biopharmaceutical classification system (BCS) class II and IV drugs. An accurate thermodynamic understanding of the ASD should be established for the ease of development of stable formulation with desired product performances. In this study, we report a first experimental approach combined with classic Flory–Huggins (F–H) modelling to understand the performances of ASD across the entire temperature and drug composition range. At low temperature and drug loading, water (moisture) was induced into the system to increase the mobility and accelerate the amorphous drug-amorphous polymer phase separation (AAPS). The binodal line indicating the boundary between one phase and AAPS of felodipine, PVPK15 and water ternary system was successfully measured, and the corresponding F–H interaction parameters (χ) for FD-PVPK15 binary system were derived. By combining dissolution/melting depression with AAPS approach, the relationship between temperature and drug loading with χ (Φ, T) for FD-PVPK15 system was modelled across the entire range as χ = 1.72 − 852/T + 5.17·Φ − 7.85·Φ2. This empirical equation can provide better understanding and prediction for the miscibility and stability of drug-polymer ASD at all conditions.
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Affiliation(s)
- Yiwei Tian
- Pharmaceutical Engineering Group, School of Pharmacy, Queen's University Belfast, 97 Lisburn Road, Belfast BT9 7BL, UK.
| | - Kaijie Qian
- Pharmaceutical Engineering Group, School of Pharmacy, Queen's University Belfast, 97 Lisburn Road, Belfast BT9 7BL, UK
| | - Esther Jacobs
- Pharmaceutical Engineering Group, School of Pharmacy, Queen's University Belfast, 97 Lisburn Road, Belfast BT9 7BL, UK
| | - Esther Amstad
- Soft Materials Laboratory, Institute of Materials, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - David S Jones
- Pharmaceutical Engineering Group, School of Pharmacy, Queen's University Belfast, 97 Lisburn Road, Belfast BT9 7BL, UK
| | - Lorenzo Stella
- Atomistic Simulation Centre, School of Mathematics and Physics, Queen's University Belfast, 7-9 College Park E, Belfast BT7 1PS, UK
- School of Chemistry and Chemical Engineering, Queen's University Belfast, David Keir Building, Stranmillis Road, Belfast BT9 5AG, UK
| | - Gavin P Andrews
- Pharmaceutical Engineering Group, School of Pharmacy, Queen's University Belfast, 97 Lisburn Road, Belfast BT9 7BL, UK
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