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Baran E, Birczyński A, Dorożyński P, Kulinowski P. Spatially resolved polymer mobilization revisited - Three-dimensional, UltraShort Echo Time (3D UTE) magnetic resonance imaging of sodium alginate matrix tablets. J Colloid Interface Sci 2023; 649:626-634. [PMID: 37364462 DOI: 10.1016/j.jcis.2023.06.139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 05/24/2023] [Accepted: 06/19/2023] [Indexed: 06/28/2023]
Abstract
HYPOTHESIS Three-dimensional 1H UltraShort Echo Time magnetic resonance imaging (1H 3D UTE MRI) of the matrix tablet made of hydrophilic polymer hydrated in heavy water (D2O) will allow investigation of the hydration-induced spatiotemporal evolution of the material originally included in the matrix tablet during manufacturing (i.e., polymer chains and bound water). EXPERIMENTS The oblong-shaped sodium alginate matrix tablets were used to verify the hypothesis. The matrix was measured before and during hydration in D2O for up to 2 h using the 1H 3D UTE MRI. Five echo times (first at 20 μs) were used, resulting in five three-dimensional images (one image for each echo time). In chosen cross-sections, two parametric images, i.e., amplitude and T2* relaxation time maps, were calculated using "pixel-by-pixel" mono-exponential fitting. FINDINGS The regions of the alginate matrix with T2* shorter than 600 μs were analyzed before (air-dry matrix) and during hydration (parametric, spatiotemporal analysis). During the study, only hydrogen nuclei (protons) pre-existing in the air-dry sample (polymer and bound water) were monitored because the hydration medium (D2O) was not visible. As a result, it was found that morphological changes in regions having T2* shorter than 300 μs were the effect of fast initial water ingress into the core of the matrix and subsequent polymer mobilization (early hydration providing additional 5% w/w hydration medium content relating to air-dry matrix). In particular, evolving layers in T2* maps were detected, and a fracture network was formed shortly after the matrix immersion in D2O. The current study presented a coherent picture of polymer mobilization accompanied by local polymer density decrease. We concluded, that the T2* mapping using 3D UTE MRI can effectively be applied as a polymer mobilization marker.
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Affiliation(s)
- Ewelina Baran
- Institute of Technology, The Pedagogical University of Kraków, Podchorążych 2, 30-084 Kraków, Poland.
| | - Artur Birczyński
- Institute of Technology, The Pedagogical University of Kraków, Podchorążych 2, 30-084 Kraków, Poland.
| | - Przemysław Dorożyński
- Department of Drug Technology and Pharmaceutical Biotechnology, Medical University of Warsaw, Banacha 1, 02-097 Warszawa, Poland.
| | - Piotr Kulinowski
- Institute of Technology, The Pedagogical University of Kraków, Podchorążych 2, 30-084 Kraków, Poland.
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van Haaren C, De Bock M, Kazarian SG. Advances in ATR-FTIR Spectroscopic Imaging for the Analysis of Tablet Dissolution and Drug Release. Molecules 2023; 28:4705. [PMID: 37375260 DOI: 10.3390/molecules28124705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 06/06/2023] [Accepted: 06/09/2023] [Indexed: 06/29/2023] Open
Abstract
One of the major challenges in the development of effective pharmaceutical formulations for oral administration is the poor solubility of active pharmaceutical ingredients. For this reason, the dissolution process and drug release from solid oral dosage forms, such as tablets, is usually thoroughly studied in order to understand the dissolution behaviour under various conditions and optimize the formulation accordingly. Standard dissolution tests used in the pharmaceutical industry provide information on the amount of drug released over time; however, these do not allow for a detailed analysis of the underlying chemical and physical mechanisms of tablet dissolution. FTIR spectroscopic imaging, by contrast, does offer the ability to study these processes with high spatial and chemical specificity. As such, the method allows us to see the chemical and physical processes which occur inside the tablet as it dissolves. In this review, the power of ATR-FTIR spectroscopic imaging is demonstrated by presenting a number of successful applications of this chemical imaging technique to dissolution and drug release studies for a range of different pharmaceutical formulations and study conditions. Understanding these processes is essential for the development of effective oral dosage forms and optimization of pharmaceutical formulations.
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Affiliation(s)
- Céline van Haaren
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK
| | - Marieke De Bock
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK
| | - Sergei G Kazarian
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK
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Low-field time-domain NMR relaxometry for studying polymer hydration and mobilization in sodium alginate matrix tablets. Carbohydr Polym 2023; 299:120215. [PMID: 36876817 DOI: 10.1016/j.carbpol.2022.120215] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 09/26/2022] [Accepted: 10/08/2022] [Indexed: 11/09/2022]
Abstract
Sodium alginate is used in various industries, including food, pharmaceutical, and agriculture. Matrix systems, e.g., tablets, and granules, are macro samples with incorporated active substances. During hydration, they are neither equilibrated nor homogenous. Phenomena occurring during hydration of such systems are complex, determine their functional properties and hence require multimodal analysis. Still, there's a lack of comprehensive view. The study aimed to obtain unique characteristics of the sodium alginate matrix during hydration, particularly considering polymer mobilization phenomena using low-field time-domain NMR relaxometry in H2O and D2O. An increase in total signal during 4 h of hydration in D2O of ca. 30 μV resulted from polymer/water mobilization. Modes in T1-T2 maps and changes in their amplitudes reflected physicochemical state of the polymer/water system: e.g. air-dry polymer mode (T1/T2 ~ 600) and two mobilized polymer/water modes (at T1/T2 ~ 40 and T1/T2 ~ 20). The study describes the approach to evaluating the hydration of the sodium alginate matrix in terms of the temporal evolution of proton pools: those existing in the matrix before hydration and those entering the matrix from the bulk water. It provides data complementary to spatially resolved methods like MRI and microCT.
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Jia XX, Li S, Han DP, Chen RP, Yao ZY, Ning BA, Gao ZX, Fan ZC. Development and perspectives of rapid detection technology in food and environment. Crit Rev Food Sci Nutr 2021; 62:4706-4725. [PMID: 33523717 DOI: 10.1080/10408398.2021.1878101] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Food safety become a hot issue currently with globalization of food trade and food supply chains. Chemical pollution, microbial contamination and adulteration in food have attracted more attention worldwide. Contamination with antibiotics, estrogens and heavy metals in water environment and soil environment have also turn into an enormous threat to food safety. Traditional small-scale, long-term detection technologies have been unable to meet the current needs. In the monitoring process, rapid, convenient, accurate analysis and detection technologies have become the future development trend. We critically synthesizing the current knowledge of various rapid detection technology, and briefly touched upon the problem which still exist in research process. The review showed that the application of novel materials promotes the development of rapid detection technology, high-throughput and portability would be popular study directions in the future. Of course, the ultimate aim of the research is how to industrialization these technologies and apply to the market.
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Affiliation(s)
- Xue-Xia Jia
- Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin, P.R. China.,State Key Laboratory of Food Nutrition and Safety, China International Scientific & Technological Cooperation Base for Health Biotechnology, College of Food Engineering and Biotechnology, Tianjin University of Science & Technology, Tianjin, P.R. China
| | - Shuang Li
- Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin, P.R. China
| | - Dian-Peng Han
- Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin, P.R. China
| | - Rui-Peng Chen
- Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin, P.R. China
| | - Zi-Yi Yao
- Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin, P.R. China
| | - Bao-An Ning
- Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin, P.R. China
| | - Zhi-Xian Gao
- Institute of Environmental and Operational Medicine, Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin, P.R. China
| | - Zhen-Chuan Fan
- State Key Laboratory of Food Nutrition and Safety, China International Scientific & Technological Cooperation Base for Health Biotechnology, College of Food Engineering and Biotechnology, Tianjin University of Science & Technology, Tianjin, P.R. China
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Bernin D, Marucci M, Boissier C, Hjärtstam J, Olsson U, Abrahmsén-Alami S. Real time MRI to elucidate the functionality of coating films intended for modified release. J Control Release 2019; 311-312:117-124. [PMID: 31454531 DOI: 10.1016/j.jconrel.2019.08.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2019] [Revised: 08/22/2019] [Accepted: 08/23/2019] [Indexed: 01/08/2023]
Abstract
Polymer films based on mixtures of ethyl cellulose (EC) and hydroxypropyl cellulose (HPC) have been widely used to coat pellets and tablets to modify the release profile of drugs. For three different EC/HPC films we used 1H and 19F MRI in combination with a designed release cell to monitor the drug, polymer and water in 5 dimensional (5D) datasets; three spatial, one diffusion or relaxation and a temporal dimension, in real time. We observed that the water inflow through the films correlated with the initiation of the dissolution of the drug in the tablet beneath the film. Leaching of the pore forming HPC further accelerated water penetration and resulted in a drug release onset after a hydrostatic pressure was generated below the film indicated by positional changes of the film. For the more permeable film, both water ingress and drug egress showed a large variability of release over the film surface indicating the heterogeneity of the system. Furthermore, the 1H diffusion dataset revealed the formation of a gel layer of HPC at the film surface. We conclude that the setup presented provides a significant level of details, which are not achieved with traditional methods.
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Affiliation(s)
- Diana Bernin
- Swedish NMR Centre, University of Gothenburg, SE-41390 Gothenburg, Sweden; Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.
| | - Mariagrazia Marucci
- Pharmaceutical Technology and Development, AstraZeneca Gothenburg, SE-43183 Mölndal, Sweden
| | - Catherine Boissier
- Pharmaceutical Technology and Development, AstraZeneca Gothenburg, SE-43183 Mölndal, Sweden; Biopharmaceuticals R & D, AstraZeneca, Gothenburg, SE-43183 Mölndal, Sweden
| | - Johan Hjärtstam
- Pharmaceutical Technology and Development, AstraZeneca Gothenburg, SE-43183 Mölndal, Sweden
| | - Ulf Olsson
- Physical Chemistry, Lund University, Box 124, SE-22100 Lund, Sweden
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Terenzi C, Sederman AJ, Mantle MD, Gladden LF. Spatially-resolved 1H NMR relaxation-exchange measurements in heterogeneous media. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2019; 299:101-108. [PMID: 30593999 DOI: 10.1016/j.jmr.2018.12.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 12/07/2018] [Accepted: 12/13/2018] [Indexed: 06/09/2023]
Abstract
In the last decades, the 1H NMR T2-T2 relaxation-exchange (REXSY) technique has become an essential tool for the molecular investigation of simple and complex fluids in heterogeneous porous solids and soft matter, where the mixing-time-evolution of cross-correlated T2-T2 peaks enables a quantitative study of diffusive exchange kinetics in multi-component systems. Here, we present a spatially-resolved implementation of the T2-T2 correlation technique, named z-T2-T2, based on one-dimensional spatial mapping along z using a rapid frequency-encode imaging scheme. Compared to other phase-encoding methods, the adopted MRI technique has two distinct advantages: (i) is has the same experimental duration of a standard (bulk) T2-T2 measurement, and (ii) it provides a high spatial resolution. The proposed z-T2-T2 method is first validated against bulk T2-T2 measurements on homogeneous phantom consisting of cyclohexane uniformly imbibed in finely-sized α-Al2O3 particles at a spatial resolution of 0.47 mm; thereafter, its performance is demonstrated, on a layered bed of multi-sized α-Al2O3 particles, for revealing spatially-dependent molecular exchange kinetics properties of intra- and inter-particle cyclohexane as a function of particle size. It is found that localised z-T2-T2 spectra provide well resolved cross peaks whilst such resolution is lost in standard bulk T2-T2 data. Future prospective applications of the method lie, in particular, in the local characterisation of mass transport phenomena in multi-component porous media, such as rock cores and heterogeneous catalysts.
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Affiliation(s)
- Camilla Terenzi
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, UK
| | - Andrew J Sederman
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, UK
| | - Michael D Mantle
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, UK.
| | - Lynn F Gladden
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, UK
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7
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Markl D, Strobel A, Schlossnikl R, Bøtker J, Bawuah P, Ridgway C, Rantanen J, Rades T, Gane P, Peiponen KE, Zeitler JA. Characterisation of pore structures of pharmaceutical tablets: A review. Int J Pharm 2018; 538:188-214. [PMID: 29341913 DOI: 10.1016/j.ijpharm.2018.01.017] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 01/03/2018] [Accepted: 01/05/2018] [Indexed: 10/18/2022]
Abstract
Traditionally, the development of a new solid dosage form is formulation-driven and less focus is put on the design of a specific microstructure for the drug delivery system. However, the compaction process particularly impacts the microstructure, or more precisely, the pore architecture in a pharmaceutical tablet. Besides the formulation, the pore structure is a major contributor to the overall performance of oral solid dosage forms as it directly affects the liquid uptake rate, which is the very first step of the dissolution process. In future, additive manufacturing is a potential game changer to design the inner structures and realise a tailor-made pore structure. In pharmaceutical development the pore structure is most commonly only described by the total porosity of the tablet matrix. Yet it is of great importance to consider other parameters to fully resolve the interplay between microstructure and dosage form performance. Specifically, tortuosity, connectivity, as well as pore shape, size and orientation all impact the flow paths and play an important role in describing the fluid flow in a pharmaceutical tablet. This review presents the key properties of the pore structures in solid dosage forms and it discusses how to measure these properties. In particular, the principles, advantages and limitations of helium pycnometry, mercury porosimetry, terahertz time-domain spectroscopy, nuclear magnetic resonance and X-ray computed microtomography are discussed.
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Affiliation(s)
- Daniel Markl
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, CB3 0AS Cambridge, UK.
| | - Alexa Strobel
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, CB3 0AS Cambridge, UK
| | - Rüdiger Schlossnikl
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, CB3 0AS Cambridge, UK
| | - Johan Bøtker
- Department of Pharmacy, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Prince Bawuah
- School of Pharmacy, Promis Centre, University of Eastern Finland, P.O. Box 1617, FI-70211 Kuopio, Finland
| | - Cathy Ridgway
- Omya International AG, CH-4665 Oftringen, Switzerland
| | - Jukka Rantanen
- Department of Pharmacy, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Thomas Rades
- Department of Pharmacy, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Patrick Gane
- Omya International AG, CH-4665 Oftringen, Switzerland; School of Chemical Technology, Department of Bioproducts and Biosystems, Aalto University, FI-00076 Aalto, Helsinki, Finland
| | - Kai-Erik Peiponen
- Institute of Photonics, University of Eastern Finland, P.O. Box 111, FI-80101 Joensuu, Finland
| | - J Axel Zeitler
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, CB3 0AS Cambridge, UK
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In Situ Chemically-Selective Monitoring of Multiphase Displacement Processes in a Carbonate Rock Using 3D Magnetic Resonance Imaging. Transp Porous Media 2018; 121:15-35. [PMID: 31983793 PMCID: PMC6954023 DOI: 10.1007/s11242-017-0945-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Accepted: 09/23/2017] [Indexed: 11/24/2022]
Abstract
Accurate monitoring of multiphase displacement processes is essential for the development, validation and benchmarking of numerical models used for reservoir simulation and for asset characterization. Here we demonstrate the first application of a chemically-selective 3D magnetic resonance imaging (MRI) technique which provides high-temporal resolution, quantitative, spatially resolved information of oil and water saturations during a dynamic imbibition core flood experiment in an Estaillades carbonate rock. Firstly, the relative saturations of dodecane (\documentclass[12pt]{minimal}
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\begin{document}$$S_{\mathrm{o}})$$\end{document}So) and water (\documentclass[12pt]{minimal}
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\begin{document}$$S_{\mathrm{w}})$$\end{document}Sw), as determined from the MRI measurements, have been benchmarked against those obtained from nuclear magnetic resonance (NMR) spectroscopy and volumetric analysis of the core flood effluent. Excellent agreement between both the NMR and MRI determinations of \documentclass[12pt]{minimal}
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\begin{document}$$S_{\mathrm{w}}$$\end{document}Sw was obtained. These values were in agreement to 4 and 9% of the values determined by volumetric analysis, with absolute errors in the measurement of saturation determined by NMR and MRI being 0.04 or less over the range of relative saturations investigated. The chemically-selective 3D MRI method was subsequently applied to monitor the displacement of dodecane in the core plug sample by water under continuous flow conditions at an interstitial velocity of \documentclass[12pt]{minimal}
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\begin{document}$$1.27\times 10^{-6}\,\hbox {m}\,\hbox {s}^{-1}$$\end{document}1.27×10-6ms-1 (\documentclass[12pt]{minimal}
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\begin{document}$$0.4\,\hbox {ft}\,\hbox {day}^{-1})$$\end{document}0.4ftday-1). During the core flood, independent images of water and oil distributions within the rock core plug at a spatial resolution of \documentclass[12pt]{minimal}
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\begin{document}$$0.31\,\hbox {mm}\times 0.39\,\hbox {mm} \times 0.39\,\hbox {mm}$$\end{document}0.31mm×0.39mm×0.39mm were acquired on a timescale of 16 min per image. Using this technique the spatial and temporal dynamics of the displacement process have been monitored. This MRI technique will provide insights to structure–transport relationships associated with multiphase displacement processes in complex porous materials, such as those encountered in petrophysics research.
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Pindelska E, Sokal A, Kolodziejski W. Pharmaceutical cocrystals, salts and polymorphs: Advanced characterization techniques. Adv Drug Deliv Rev 2017; 117:111-146. [PMID: 28931472 DOI: 10.1016/j.addr.2017.09.014] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 08/21/2017] [Accepted: 09/14/2017] [Indexed: 12/11/2022]
Abstract
The main goal of a novel drug development is to obtain it with optimal physiochemical, pharmaceutical and biological properties. Pharmaceutical companies and scientists modify active pharmaceutical ingredients (APIs), which often are cocrystals, salts or carefully selected polymorphs, to improve the properties of a parent drug. To find the best form of a drug, various advanced characterization methods should be used. In this review, we have described such analytical methods, dedicated to solid drug forms. Thus, diffraction, spectroscopic, thermal and also pharmaceutical characterization methods are discussed. They all are necessary to study a solid API in its intrinsic complexity from bulk down to the molecular level, gain information on its structure, properties, purity and possible transformations, and make the characterization efficient, comprehensive and complete. Furthermore, these methods can be used to monitor and investigate physical processes, involved in the drug development, in situ and in real time. The main aim of this paper is to gather information on the current advancements in the analytical methods and highlight their pharmaceutical relevance.
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Rondeau-Mouro C, Kovrlija R, Gambarota G, Saint-Jalmes H. μ-ViP: Customized virtual phantom for quantitative magnetic resonance micro-imaging at high magnetic field. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2017; 275:73-79. [PMID: 28024256 DOI: 10.1016/j.jmr.2016.12.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Revised: 12/08/2016] [Accepted: 12/09/2016] [Indexed: 06/06/2023]
Abstract
The applications of Magnetic Resonance micro-Imaging (MRμI) cover nowadays a wide range of fields. However few of them present quantitative measurements when the sample of interest changes over time or in case of a long acquisition time. In this domain, two challenges have to be overcome: the introduction of a phantom as a reference signal and the guarantee that this signal is stable over the experiment duration while some conditions such as temperature and/or the moisture are varied. The aim of the present study was to implement a dedicated experimental set-up to generate a virtual phantom (ViP) signal in a vertical-bore 11.7 T NMR spectrometer, equipped with a micro-imaging probe. This study shows that the generation of a micro-imaging-dedicated ViP (μ-ViP) signal is of great benefit for on-line quality control of the spectrometer performance during acquisition in the case of real-time experiments. Thus, μViP represents a step towards improvement of the magnetic resonance signal quantification in small samples.
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Affiliation(s)
- C Rondeau-Mouro
- Irstea, UR OPAALE, 17 avenue de Cucillé, CS 64427, F-35044 Rennes, France; Université Bretagne Loire, France.
| | - R Kovrlija
- Irstea, UR OPAALE, 17 avenue de Cucillé, CS 64427, F-35044 Rennes, France; Université Bretagne Loire, France
| | - G Gambarota
- INSERM, UMR 1099, Rennes, France; LTSI, Université de Rennes 1, 35000 Rennes, France
| | - H Saint-Jalmes
- INSERM, UMR 1099, Rennes, France; LTSI, Université de Rennes 1, 35000 Rennes, France; CRLCC, Centre Eugène Marquis, Rennes, France
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11
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Mantle MD. Magnetic Resonance Imaging and Its Applications to Solid Pharmaceutical Dosage Forms. ACTA ACUST UNITED AC 2016. [DOI: 10.1007/978-1-4939-4029-5_18] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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12
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Sonmez M, Verisan C, Voicu G, Ficai D, Ficai A, Oprea AE, Vlad M, Andronescu E. Extended release of vitamins from magnetite loaded polyanionic polymeric beads. Int J Pharm 2016; 510:457-64. [DOI: 10.1016/j.ijpharm.2015.11.041] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Revised: 11/23/2015] [Accepted: 11/24/2015] [Indexed: 10/22/2022]
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13
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Boyce CM, Rice NP, Sederman AJ, Dennis JS, Holland DJ. 11-interval PFG pulse sequence for improved measurement of fast velocities of fluids with high diffusivity in systems with short T2(∗). JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2016; 265:67-76. [PMID: 26867090 DOI: 10.1016/j.jmr.2016.01.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Revised: 01/13/2016] [Accepted: 01/19/2016] [Indexed: 06/05/2023]
Abstract
Magnetic resonance (MR) was used to measure SF6 gas velocities in beds filled with particles of 1.1 mm and 0.5 mm in diameter. Four pulse sequences were tested: a traditional spin echo pulse sequence, the 9-interval and 13-interval pulse sequence of Cotts et al. (1989) and a newly developed 11-interval pulse sequence. All pulse sequences measured gas velocity accurately in the region above the particles at the highest velocities that could be achieved (up to 0.1 ms(-1)). The spin echo pulse sequence was unable to measure gas velocity accurately in the bed of particles, due to effects of background gradients, diffusivity and acceleration in flow around particles. The 9- and 13-interval pulse sequence measured gas velocity accurately at low flow rates through the particles (expected velocity <0.06 ms(-1)), but could not measure velocity accurately at higher flow rates. The newly developed 11-interval pulse sequence was more accurate than the 9- and 13-interval pulse sequences at higher flow rates, but for velocities in excess of 0.1 ms(-1) the measured velocity was lower than the expected velocity. The increased accuracy arose from the smaller echo time that the new pulse sequence enabled, reducing selective attenuation of signal from faster moving nuclei.
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Affiliation(s)
- C M Boyce
- Department of Chemical Engineering and Biotechnology, University of Cambridge, New Museums Site, Pembroke Street, Cambridge CB2 3RA, UK.
| | - N P Rice
- Department of Chemical Engineering and Biotechnology, University of Cambridge, New Museums Site, Pembroke Street, Cambridge CB2 3RA, UK
| | - A J Sederman
- Department of Chemical Engineering and Biotechnology, University of Cambridge, New Museums Site, Pembroke Street, Cambridge CB2 3RA, UK
| | - J S Dennis
- Department of Chemical Engineering and Biotechnology, University of Cambridge, New Museums Site, Pembroke Street, Cambridge CB2 3RA, UK
| | - D J Holland
- Department of Chemical Engineering and Biotechnology, University of Cambridge, New Museums Site, Pembroke Street, Cambridge CB2 3RA, UK
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Gajdošová M, Pěček D, Sarvašová N, Grof Z, Štěpánek F. Effect of hydrophobic inclusions on polymer swelling kinetics studied by magnetic resonance imaging. Int J Pharm 2016; 500:136-43. [PMID: 26780121 DOI: 10.1016/j.ijpharm.2016.01.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 01/12/2016] [Accepted: 01/13/2016] [Indexed: 11/25/2022]
Abstract
The rate of drug release from polymer matrix-based sustained release formulations is often controlled by the thickness of a gel layer that forms upon contact with dissolution medium. The effect of formulation parameters on the kinetics of elementary rate processes that contribute to gel layer formation, such as water ingress, polymer swelling and erosion, is therefore of interest. In the present work, gel layer formation has been investigated by magnetic resonance imaging (MRI), which is a non-destructive method allowing direct visualization of effective water concentration inside the tablet and its surrounding. Using formulations with Levetiracetam as the active ingredient, HPMC as a hydrophilic matrix former and carnauba wax (CW) as a hydrophobic component in the matrix system, the effect of different ratios of these two ingredients on the kinetics of gel formation (MRI) and drug release (USP 4 like dissolution test) has been investigated and interpreted using a mathematical model.
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Affiliation(s)
- Michaela Gajdošová
- Department of Chemical Engineering, Institute of Chemical Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic
| | - Daniel Pěček
- Zentiva, k.s., U Kabelovny 130, Prague 10, Czech Republic
| | - Nina Sarvašová
- Department of Chemical Engineering, Institute of Chemical Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic
| | - Zdeněk Grof
- Department of Chemical Engineering, Institute of Chemical Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic
| | - František Štěpánek
- Department of Chemical Engineering, Institute of Chemical Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic.
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15
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Kulinowski P, Woyna-Orlewicz K, Rappen GM, Haznar-Garbacz D, Węglarz WP, Dorożyński PP. An understanding of modified release matrix tablets behavior during drug dissolution as the key for prediction of pharmaceutical product performance – case study of multimodal characterization of quetiapine fumarate tablets. Int J Pharm 2015; 484:235-45. [DOI: 10.1016/j.ijpharm.2015.02.040] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2014] [Revised: 02/11/2015] [Accepted: 02/16/2015] [Indexed: 10/24/2022]
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16
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Mitchell J, Chandrasekera TC. Understanding generalized inversions of nuclear magnetic resonance transverse relaxation time in porous media. J Chem Phys 2014; 141:224201. [DOI: 10.1063/1.4903311] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Paudel A, Geppi M, Mooter GVD. Structural and Dynamic Properties of Amorphous Solid Dispersions: The Role of Solid-State Nuclear Magnetic Resonance Spectroscopy and Relaxometry. J Pharm Sci 2014; 103:2635-2662. [DOI: 10.1002/jps.23966] [Citation(s) in RCA: 98] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 03/17/2014] [Accepted: 03/17/2014] [Indexed: 01/17/2023]
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18
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Kulinowski P, Młynarczyk A, Jasiński K, Talik P, Gruwel MLH, Tomanek B, Węglarz WP, Dorożyński P. Magnetic resonance microscopy for assessment of morphological changes in hydrating hydroxypropylmethylcellulose matrix tablets in situ-is it possible to detect phenomena related to drug dissolution within the hydrated matrices? Pharm Res 2014; 31:2383-92. [PMID: 24633415 PMCID: PMC4180912 DOI: 10.1007/s11095-014-1334-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2013] [Accepted: 02/08/2014] [Indexed: 11/06/2022]
Abstract
Purpose So far, the hydrated part of the HPMC matrix has commonly been denoted as a “gel” or “pseudogel” layer. No MRI-based results have been published regarding observation of internal phenomena related to drug dissolution inside swelling polymeric matrices during hydration. The purpose of the study was to detect such phenomena. Methods Multiparametric, spatially and temporally resolved T2 MR relaxometry, in situ, was applied to study formation of the hydration progress in HPMC matrix tablets loaded with L-dopa and ketoprofen using a 11.7 T MRI system. Two spin-echo based pulse sequences were used, one of them specifically designed to study short T2 signals. Results Two components in the T2 decay envelope were estimated and spatial distributions of their parameters, i.e. amplitudes and T2 values, were obtained. Based on the data, different region formation patterns (i.e. multilayer structure) were registered depending on drug presence and solubility. Inside the matrix with incorporated sparingly soluble drug a specific layer formation due to drug dissolution was detected, whereas a matrix with very slightly soluble drug does not form distinct external “gel-like” layer. Conclusions We have introduced a new paradigm in the characterization of hydrating matrices using 1H MRI methods. It reflects molecular mobility and concentration of water inside the hydrated matrix. For the first time, drug dissolution related phenomena, i.e. particular front and region formation, were observed by MRI methods.
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Affiliation(s)
- Piotr Kulinowski
- Department of Magnetic Resonance Imaging, Institute of Nuclear Physics PAN, ul. Radzikowskiego 152, 31-342, Kraków, Poland,
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Chen C, Gladden LF, Mantle MD. Direct Visualization of in Vitro Drug Mobilization from Lescol XL Tablets Using Two-Dimensional 19F and 1H Magnetic Resonance Imaging. Mol Pharm 2014; 11:630-7. [DOI: 10.1021/mp400407c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chen Chen
- Department of Chemical Engineering & Biotechnology, University of Cambridge, Cambridge, CB2 3RA, United Kingdom
| | - Lynn F. Gladden
- Department of Chemical Engineering & Biotechnology, University of Cambridge, Cambridge, CB2 3RA, United Kingdom
| | - Michael D. Mantle
- Department of Chemical Engineering & Biotechnology, University of Cambridge, Cambridge, CB2 3RA, United Kingdom
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20
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Mitchell J, Gladden LF, Chandrasekera TC, Fordham EJ. Low-field permanent magnets for industrial process and quality control. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2014; 76:1-60. [PMID: 24360243 DOI: 10.1016/j.pnmrs.2013.09.001] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Revised: 09/19/2013] [Accepted: 09/19/2013] [Indexed: 05/13/2023]
Abstract
In this review we focus on the technology associated with low-field NMR. We present the current state-of-the-art in low-field NMR hardware and experiments, considering general magnet designs, rf performance, data processing and interpretation. We provide guidance on obtaining the optimum results from these instruments, along with an introduction for those new to low-field NMR. The applications of lowfield NMR are now many and diverse. Furthermore, niche applications have spawned unique magnet designs to accommodate the extremes of operating environment or sample geometry. Trying to capture all the applications, methods, and hardware encompassed by low-field NMR would be a daunting task and likely of little interest to researchers or industrialists working in specific subject areas. Instead we discuss only a few applications to highlight uses of the hardware and experiments in an industrial environment. For details on more particular methods and applications, we provide citations to specialized review articles.
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Affiliation(s)
- J Mitchell
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Pembroke Street, Cambridge CB2 3RA, United Kingdom; Schlumberger Gould Research, High Cross, Madingley Road, Cambridge CB3 0EL, United Kingdom
| | - L F Gladden
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Pembroke Street, Cambridge CB2 3RA, United Kingdom.
| | - T C Chandrasekera
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Pembroke Street, Cambridge CB2 3RA, United Kingdom
| | - E J Fordham
- Schlumberger Gould Research, High Cross, Madingley Road, Cambridge CB3 0EL, United Kingdom
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Knöös P, Topgaard D, Wahlgren M, Ulvenlund S, Piculell L. Using NMR chemical shift imaging to monitor swelling and molecular transport in drug-loaded tablets of hydrophobically modified poly(acrylic acid): methodology and effects of polymer (in)solubility. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:13898-13908. [PMID: 24106807 DOI: 10.1021/la4024458] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A new technique has been developed using NMR chemical shift imaging (CSI) to monitor water penetration and molecular transport in initially dry polymer tablets that also contain small low-molecular weight compounds to be released from the tablets. Concentration profiles of components contained in the swelling tablets could be extracted via the intensities and chemical shift changes of peaks corresponding to protons of the components. The studied tablets contained hydrophobically modified poly(acrylic acid) (HMPAA) as the polymer component and griseofulvin and ethanol as hydrophobic and hydrophilic, respectively, low-molecular weight model compounds. The water solubility of HMPAA could be altered by titration with NaOH. In the pure acid form, HMPAA tablets only underwent a finite swelling until the maximum water content of the polymer-rich phase, as confirmed by independent phase studies, had been reached. By contrast, after partial neutralization with NaOH, the polyacid became fully miscible with water. The solubility of the polymer affected the water penetration, the polymer release, and the releases of both ethanol and griseofulvin. The detailed NMR CSI concentration profiles obtained highlighted the clear differences in the disintegration/dissolution/release behavior for the two types of tablet and provided insights into their molecular origin. The study illustrates the potential of the NMR CSI technique to give information of importance for the development of pharmaceutical tablets and, more broadly, for the general understanding of any operation that involves the immersion and ultimate disintegration of a dry polymer matrix in a solvent.
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Affiliation(s)
- Patrik Knöös
- Division of Physical Chemistry, Lund University , Box 124, SE-221 00 Lund, Sweden
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22
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Ramskill N, Gladden L, York A, Sederman A, Mitchell J, Hardstone K. Understanding the operation and preparation of diesel particulate filters using a multi-faceted nuclear magnetic resonance approach. Catal Today 2013. [DOI: 10.1016/j.cattod.2013.06.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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23
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Mitchell J, Chandrasekera TC, Gladden LF. Measurement of the true transverse nuclear magnetic resonance relaxation in the presence of field gradients. J Chem Phys 2013; 139:074205. [DOI: 10.1063/1.4818806] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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25
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Yin X, Li H, Liu R, Chen J, Ji J, Chen J, Shao Q, Xiao T, York P, He Y, Zhang J. Fractal structure determines controlled release kinetics of monolithic osmotic pump tablets. J Pharm Pharmacol 2013; 65:953-9. [PMID: 23738722 DOI: 10.1111/jphp.12056] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Accepted: 02/08/2013] [Indexed: 12/01/2022]
Abstract
Abstract
Objectives
To calculate the fractal dimension values of felodipine osmotic pump tablets during drug dissolution and to characterize the mechanism of the controlled drug release kinetics through three-dimensional fractal data.
Methods
Three-dimensional fractal values of volume (Df,volume) and surface (Df,surface) of the tablet core were calculated based on the box counting method.
Key findings
During the process of release of felodipine, both Df,volume and Df,surface were within the range of 2–3 and then changed markedly after a period of 3.0 h release, corresponding to extensive changes in entire shape, interior porous channels and surface structure of the tablet core. The curve of Df,volume mirrored that for tablet volume, however the curve of Df,surface was quite different from that of the surface area. Results showed that values of Df,surface correlated well with the drug release rate. Df,surface was found to be an efficient fractal parameter that could be used to characterize the complex changes to the tablet core that take place during drug release.
Conclusions
The fractal dimension can be used as a quantitative indicator reflecting the drug release performance and be regarded as a key indicator for the quality control of oral controlled drug delivery systems.
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Affiliation(s)
- Xianzhen Yin
- Center for Drug Delivery System, Shanghai Institute of Materia Medica, Shanghai, China
- Institute of Pharmaceutical Innovation, University of Bradford, Bradford, West Yorkshire, UK
| | - Haiyan Li
- Center for Drug Delivery System, Shanghai Institute of Materia Medica, Shanghai, China
| | - Ruihao Liu
- Center for Drug Delivery System, Shanghai Institute of Materia Medica, Shanghai, China
| | - Jing Chen
- Center for Drug Delivery System, Shanghai Institute of Materia Medica, Shanghai, China
| | - Junqiu Ji
- Hefei Lifeon Medication Group, Hefei, China
| | - Jun Chen
- Hefei Lifeon Medication Group, Hefei, China
| | - Qun Shao
- Institute of Pharmaceutical Innovation, University of Bradford, Bradford, West Yorkshire, UK
| | - Tiqiao Xiao
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China
| | - Peter York
- Institute of Pharmaceutical Innovation, University of Bradford, Bradford, West Yorkshire, UK
| | - You He
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China
| | - Jiwen Zhang
- Center for Drug Delivery System, Shanghai Institute of Materia Medica, Shanghai, China
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26
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Anghel I, Grumezescu AM. Hybrid nanostructured coating for increased resistance of prosthetic devices to staphylococcal colonization. NANOSCALE RESEARCH LETTERS 2013; 8:6. [PMID: 23281840 PMCID: PMC3599461 DOI: 10.1186/1556-276x-8-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Accepted: 12/16/2012] [Indexed: 05/10/2023]
Abstract
Prosthetic medical device-associated infections are responsible for significant morbidity and mortality rates. Novel improved materials and surfaces exhibiting inappropriate conditions for microbial development are urgently required in the medical environment. This study reveals the benefit of using natural Mentha piperita essential oil, combined with a 5 nm core/shell nanosystem-improved surface exhibiting anti-adherence and antibiofilm properties. This strategy reveals a dual role of the nano-oil system; on one hand, inhibiting bacterial adherence and, on the other hand, exhibiting bactericidal effect, the core/shell nanosystem is acting as a controlled releasing machine for the essential oil. Our results demonstrate that this dual nanobiosystem is very efficient also for inhibiting biofilm formation, being a good candidate for the design of novel material surfaces used for prosthetic devices.
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Affiliation(s)
- Ion Anghel
- ENT, “Carol Davila” University of Medicine and Pharmacy, Traian Vuia no.6, Bucharest 020956, Romania
- Doctor Anghel Medical Center, Theodor Sperantia Street, Bucharest, 30932, Romania
| | - Alexandru Mihai Grumezescu
- Department of Science and Engineering of Oxidic Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu Street no 1-7, Bucharest 011061, Romania
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27
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Anghel I, Holban AM, Grumezescu AM, Andronescu E, Ficai A, Anghel AG, Maganu M, Lazǎr V, Chifiriuc MC. Modified wound dressing with phyto-nanostructured coating to prevent staphylococcal and pseudomonal biofilm development. NANOSCALE RESEARCH LETTERS 2012; 7:690. [PMID: 23272823 PMCID: PMC3563570 DOI: 10.1186/1556-276x-7-690] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Accepted: 12/16/2012] [Indexed: 06/01/2023]
Abstract
This paper reports a newly fabricated nanophyto-modified wound dressing with microbicidal and anti-adherence properties. Nanofluid-based magnetite doped with eugenol or limonene was used to fabricate modified wound dressings. Nanostructure coated materials were characterized by TEM, XRD, and FT-IR. For the quantitative measurement of biofilm-embedded microbial cells, a culture-based method for viable cell count was used. The optimized textile dressing samples proved to be more resistant to staphylococcal and pseudomonal colonization and biofilm formation compared to the uncoated controls. The functionalized surfaces for wound dressing seems to be a very useful tool for the prevention of wound microbial contamination on viable tissues.
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Affiliation(s)
- Ion Anghel
- ENT (Otolaryngology) Department, Coltea Hospital, Carol Davila University of Medicine and Pharmacy, IC Bratianu No. 1, Bucharest, 030171, Romania
- Doctor Anghel Medical Center, Theodor Sperantia Street, Bucharest, 30932, Romania
| | - Alina Maria Holban
- Department of Microbiology, Faculty of Biology, Universtity of Bucharest, Aleea Portocalelor No. 1-3, Bucharest, 060101, Romania
| | - Alexandru Mihai Grumezescu
- Department of Science and Engineering of Oxidic Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu Street No. 1-7, Bucharest, 011061, Romania
| | - Ecaterina Andronescu
- Department of Science and Engineering of Oxidic Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu Street No. 1-7, Bucharest, 011061, Romania
| | - Anton Ficai
- Department of Science and Engineering of Oxidic Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu Street No. 1-7, Bucharest, 011061, Romania
| | - Alina Georgiana Anghel
- ENT (Otolaryngology) Department, Coltea Hospital, Carol Davila University of Medicine and Pharmacy, IC Bratianu no 1, 030171, Bucharest, Romania
| | - Maria Maganu
- Center of Organic Chemistry “Costin D. Nenitescu”, Romanian Academy, 202B Splaiul Independentei, Bucharest, 050461, Romania
| | - Veronica Lazǎr
- Department of Microbiology, Faculty of Biology, Universtity of Bucharest, Aleea Portocalelor No. 1-3, Bucharest, 060101, Romania
| | - Mariana Carmen Chifiriuc
- Department of Microbiology, Faculty of Biology, Universtity of Bucharest, Aleea Portocalelor No. 1-3, Bucharest, 060101, Romania
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28
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Gordon S, Naelapää K, Rantanen J, Selen A, Müllertz A, Østergaard J. Real-time dissolution behavior of furosemide in biorelevant media as determined by UV imaging. Pharm Dev Technol 2012; 18:1407-16. [PMID: 23136844 DOI: 10.3109/10837450.2012.737808] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The potential of UV imaging as a new small scale flow-through dissolution testing platform and its ability to incorporate biorelevant media was tested. Furosemide was utilized as a model poorly soluble drug, and dissolution media simulating conditions in the small intestine (5/1.25 mM and 40/10 mM bile salt/phospholipid, pH 6.5) together with corresponding blank buffer were employed. Dissolution rates as a function of flow rate (0.2-1.0 mL/min) were determined directly from UV images, and by analysis of collected effluent using UV spectrophotometry. A good agreement in dissolution rates was observed, however repeatability of data based on measurement of collected effluent was superior to that obtained by UV imaging in the utilized prototypic flow cell. Both methods indicated that biorelevant media did not markedly increase the dissolution rate of furosemide as compared to buffer. Qualitatively, UV images indicated that uncontrolled swelling/precipitation of furosemide on the compact surface was occurring in some samples. In situ Raman spectroscopy together with X-ray diffraction analysis confirmed that the observations were not due to a solid form transformation of furosemide. The presented results highlight the complementary features of the utilized techniques and, in particular, the detailed information related to dissolution behavior which can be achieved by UV imaging.
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Affiliation(s)
- Sarah Gordon
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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29
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Optimized anti-pathogenic agents based on core/shell nanostructures and 2-((4-ethylphenoxy)ethyl)-N-(substituted-phenylcarbamothioyl)-benzamides. Int J Mol Sci 2012. [PMID: 23202915 PMCID: PMC3497289 DOI: 10.3390/ijms131012584] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The purpose of this study was to design a new nanosystem for catheter surface functionalization with an improved resistance to Staphylococcus aureus ATCC 25923 and Pseudomonas aeruginosa ATCC 27853 colonization and subsequent biofilm development. New 2-((4 ethylphenoxy)methyl)-N-(substituted-phenylcarbamothioyl)-benzamides were synthesized and used for coating a core/shell nanostructure. Their chemical structures were elucidated by NMR, IR and elemental analysis, being in agreement with the proposed ones. Fe(3)O(4)/C(12 )of up to 5 nm size had been synthesized with lauric acid as a coating agent and characterized by XRD, FT-IR, TGA, TEM and biological assays. The catheter pieces were coated with the fabricated nanofluid in magnetic field. The microbial adherence ability was investigated in 6 multiwell plates by using culture based methods and Scanning Electron Microscopy (SEM). The nanoparticles coated with the obtained compounds 1a-c inhibited the adherence and biofilm development ability of the S. aureus and P. aeruginosa tested strains on the catheter functionalized surface, as shown by the reduction of viable cell counts and SEM examination of the biofilm architecture. Using the novel core/shell/adsorption-shell to inhibit the microbial adherence could be of a great interest for the biomedical field, opening new directions for the design of film-coated surfaces with improved anti-biofilm properties.
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30
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Anghel I, Limban C, Grumezescu AM, Anghel AG, Bleotu C, Chifiriuc MC. In vitro evaluation of anti-pathogenic surface coating nanofluid, obtained by combining Fe3O4/C12 nanostructures and 2-((4-ethylphenoxy)methyl)-N-(substituted-phenylcarbamothioyl)-benzamides. NANOSCALE RESEARCH LETTERS 2012; 7:513. [PMID: 22992217 PMCID: PMC3479039 DOI: 10.1186/1556-276x-7-513] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Accepted: 09/10/2012] [Indexed: 05/25/2023]
Abstract
In this paper, we report the design of a new nanofluid for anti-pathogenic surface coating. For this purpose, new 2-((4-ethylphenoxy)methyl)-N-(substituted-phenylcarbamothioyl)-benzamides were synthesized and used as an adsorption shell for Fe3O4/C12 core/shell nanosized material. The functionalized specimens were tested by in vitro assays for their anti-biofilm properties and biocompatibility. The optimized catheter sections showed an improved resistance to Staphylococcus aureus ATCC 25923 and Pseudomonas aeruginosa ATCC 27853 in vitro biofilm development, as demonstrated by the viable cell counts of biofilm-embedded bacterial cells and by scanning electron microscopy examination of the colonized surfaces. The nanofluid proved to be not cytotoxic and did not influence the eukaryotic cell cycle. These results could be of a great interest for the biomedical field, opening new directions for the design of film-coated surfaces with improved anti-biofilm properties.
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Affiliation(s)
- Ion Anghel
- ENT (Otolaryngology), Carol Davila University of Medicine and Pharmacy, Bucharest, 50474, Romania
| | - Carmen Limban
- Department of Pharmaceutical Chemistry, Carol Davila University of Medicine and Pharmacy, Bucharest, 020956, Romania
| | - Alexandru Mihai Grumezescu
- Department of Science and Engineering of Oxidic Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Bucharest, 011061, Romania
| | - Alina Georgiana Anghel
- ENT Clinic, Coltea Hospital, Carol Davila University of Medicine and Pharmacy, Bucharest, 030171, Romania
| | - Coralia Bleotu
- Stefan Nicolau Institute of Virology, Bucharest, 030304, Romania
| | - Mariana Carmen Chifiriuc
- Department of Microbiology, Faculty of Biology, University of Bucharest, Bucharest, 060101, Romania
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Magnetic resonance microscopy for assessment of morphological changes in hydrating hydroxypropylmethyl cellulose matrix tablets in situ. Pharm Res 2012; 29:3420-33. [PMID: 22923349 PMCID: PMC3497937 DOI: 10.1007/s11095-012-0837-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Accepted: 07/13/2012] [Indexed: 11/04/2022]
Abstract
Purpose To resolve contradictions found in morphology of hydrating hydroxypropylmethyl cellulose (HPMC) matrix as studied using Magnetic Resonance Imaging (MRI) techniques. Until now, two approaches were used in the literature: either two or three regions that differ in physicochemical properties were identified. Methods Multiparametric, spatially and temporally resolved T2 MR relaxometry in situ was applied to study the hydration progress in HPMC matrix tablets using a 11.7 T MRI system. Two spin-echo based pulse sequences—one of them designed to specifically study short T2 signals—were used. Results Two components in the T2 decay envelope were estimated and spatial distributions of their parameters, i.e. amplitudes and T2 values, were obtained. Based on the data, five different regions and their temporal evolution were identified: dry glassy, hydrated solid like, two interface layers and gel layer. The regions were found to be separated by four evolving fronts identified as penetration, full hydration, total gelification and apparent erosion. Conclusions The MRI results showed morphological details of the hydrating HPMC matrices matching compound theoretical models. The proposed method will allow for adequate evaluation of controlled release polymeric matrix systems loaded with drug substances of different solubility.
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Koptyug IV. MRI of mass transport in porous media: drying and sorption processes. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2012; 65:1-65. [PMID: 22781314 DOI: 10.1016/j.pnmrs.2011.12.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Accepted: 12/05/2011] [Indexed: 06/01/2023]
Affiliation(s)
- Igor V Koptyug
- International Tomography Center, SB RAS, 3A Institutskaya Str., Novosibirsk 630090, Russian Federation.
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33
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Zhang Q, Gladden L, Avalle P, Mantle M. In vitro quantitative 1H and 19F nuclear magnetic resonance spectroscopy and imaging studies of fluvastatin™ in Lescol® XL tablets in a USP-IV dissolution cell. J Control Release 2011; 156:345-54. [DOI: 10.1016/j.jconrel.2011.08.039] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Revised: 08/25/2011] [Accepted: 08/26/2011] [Indexed: 11/16/2022]
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34
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Dorożyński PP, Kulinowski P, Młynarczyk A, Stanisz GJ. MRI as a tool for evaluation of oral controlled release dosage forms. Drug Discov Today 2011; 17:110-23. [PMID: 22094243 DOI: 10.1016/j.drudis.2011.10.026] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2011] [Revised: 09/24/2011] [Accepted: 10/31/2011] [Indexed: 11/25/2022]
Abstract
The magnetic resonance imaging (MRI) studies of controlled-release (CR) dosage forms can be roughly divided into two groups. The first comprises studies performed in static conditions (small solvent volumes and ambient temperature). Such studies have provided insight into molecular phenomena in hydrating polymeric matrices. The second group covers research performed in dynamic conditions (medium flow or stirring) related to drug dissolution. An important issue is supplementation of the MRI results with data obtained by complementary techniques, such as X-ray microtomography (μCT). As we discuss here, an understanding of the mechanism underlying the release of the drug from the dosage form will lead to the development of detailed, molecularly defined, CR dosage forms.
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Affiliation(s)
- Przemysław P Dorożyński
- Department of Pharmaceutical Technology and Biopharmaceutics, Pharmaceutical Faculty, Jagiellonian University, Medical College, ul. Medyczna 9, 30-688 Kraków, Poland.
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Advanced characterisation techniques. Int J Pharm 2011; 417:1-2. [DOI: 10.1016/j.ijpharm.2011.03.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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