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Libánská A, Špringer T, Peštová L, Kotalík K, Konefał R, Šimonová A, Křížek T, Homola J, Randárová E, Etrych T. Using surface plasmon resonance, capillary electrophoresis and diffusion-ordered NMR spectroscopy to study drug release kinetics. Commun Chem 2023; 6:180. [PMID: 37653020 PMCID: PMC10471694 DOI: 10.1038/s42004-023-00992-5] [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: 05/23/2023] [Accepted: 08/22/2023] [Indexed: 09/02/2023] Open
Abstract
Nanomedicines, including polymer nanocarriers with controlled drug release, are considered next-generation therapeutics with advanced therapeutic properties and reduced side effects. To develop safe and efficient nanomedicines, it is crucial to precisely determine the drug release kinetics. Herein, we present application of analytical methods, i.e., surface plasmon resonance biosensor technology (SPR), capillary electrophoresis, and 1H diffusion-ordered nuclear magnetic resonance spectroscopy, which were innovatively applied for drug release determination. The methods were optimised to quantify the pH-triggered release of three structurally different drugs from a polymer carrier. The suitability of these methods for drug release characterisation was evaluated and compared using several parameters including applicability for diverse samples, the biological relevance of the experimental setup, method complexity, and the analysis outcome. The SPR method was the most universal method for the evaluation of diverse drug molecule release allowing continuous observation in the flow-through setting and requiring a small amount of sample.
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Affiliation(s)
- Alena Libánská
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Prague, Czech Republic
| | - Tomáš Špringer
- Institute of Photonics and Electronics, Czech Academy of Sciences, Prague, Czech Republic
| | - Lucie Peštová
- Institute of Photonics and Electronics, Czech Academy of Sciences, Prague, Czech Republic
| | - Kevin Kotalík
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Prague, Czech Republic
| | - Rafał Konefał
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Prague, Czech Republic
| | - Alice Šimonová
- Department of Analytical Chemistry, Faculty of Science, Charles University, Prague, Czech Republic
| | - Tomáš Křížek
- Department of Analytical Chemistry, Faculty of Science, Charles University, Prague, Czech Republic
| | - Jiří Homola
- Institute of Photonics and Electronics, Czech Academy of Sciences, Prague, Czech Republic
| | - Eva Randárová
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Prague, Czech Republic
| | - Tomáš Etrych
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Prague, Czech Republic.
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Gupta S, Malgar Puttaiahgowda Y. N-vinylpyrrolidone antimicrobial polymers: Current trends and emerging perspectives. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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3
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Kasprów M, Lipowska-Kur D, Otulakowski Ł, Dworak A, Trzebicka B. HEMA in Polymers with Thermoresponsive Properties. POLYM REV 2021. [DOI: 10.1080/15583724.2021.1896542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Maciej Kasprów
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences, Zabrze, Poland
| | - Daria Lipowska-Kur
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences, Zabrze, Poland
| | - Łukasz Otulakowski
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences, Zabrze, Poland
| | - Andrzej Dworak
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences, Zabrze, Poland
| | - Barbara Trzebicka
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences, Zabrze, Poland
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4
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Lee JH, Youm JS, Ju HT, Kim JC. Influence of
N
‐vinyl‐2‐pyrrolidone and methacrylic acid on thermal curing process of 2‐hydroxyethyl methacrylate hydrogel. J Appl Polym Sci 2020. [DOI: 10.1002/app.48622] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Jung Hyun Lee
- Doosan Corporation Electro‐Materials, 10 Suji‐ro 112‐gil, Suji‐gu Yongin‐si Gyeonggi‐do 16858 Republic of Korea
| | - Je Sung Youm
- Korea Institute of Industrial Technology, 6 Cheomdangwagi‐ro 208‐gil, Buk‐gu Gwangju 61012 Republic of Korea
| | - Hyoung Tae Ju
- WINIS Co. Ltd, 19‐5 Cheomdanventureso‐ro 38‐gil, Buk‐gu Gwangju 61007 Republic of Korea
| | - Jeong Cheol Kim
- Korea Institute of Industrial Technology, 6 Cheomdangwagi‐ro 208‐gil, Buk‐gu Gwangju 61012 Republic of Korea
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Kasprów M, Machnik J, Otulakowski Ł, Dworak A, Trzebicka B. Thermoresponsive P(HEMA- co-OEGMA) copolymers: synthesis, characteristics and solution behavior. RSC Adv 2019; 9:40966-40974. [PMID: 35540067 PMCID: PMC9076357 DOI: 10.1039/c9ra09668j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 12/03/2019] [Indexed: 12/26/2022] Open
Abstract
Random, thermoresponsive copolymers of 2-hydroxyethyl methacrylate (HEMA) and oligo(ethylene glycol) methyl ether methacrylate M n = 300 (OEGMA) were synthesized via atom transfer radical polymerization (ATRP) in a DMSO/H2O solvent mixture. Reactivity ratios were determined by the extended Kelen-Tudos method and found to be close to 1. Studies confirmed the randomness of the obtained copolymers. The thermoresponsiveness in water and in phosphate buffer (PBS) solutions and the influence of copolymer composition and solution concentration on the cloud point temperature (T cp) were investigated. Phase transitions in water solutions were reversible and narrow. The response of P(HEMA-co-OEGMA) to temperature could be adjusted in the range from 66.5 °C to 21.5 °C by changing the HEMA content. In PBS solutions, significant differences in the heating/cooling cycle were observed for all investigated concentrations. The presence of kosmotropic salts in PBS decreased the T cp value and caused thermal aggregation of chains to form a macroscopic aggregate at temperatures above the T cp.
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Affiliation(s)
- Maciej Kasprów
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences M. Curie-Skłodowskiej 34 Zabrze 41-819 Poland
| | - Justyna Machnik
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences M. Curie-Skłodowskiej 34 Zabrze 41-819 Poland
| | - Łukasz Otulakowski
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences M. Curie-Skłodowskiej 34 Zabrze 41-819 Poland
| | - Andrzej Dworak
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences M. Curie-Skłodowskiej 34 Zabrze 41-819 Poland
| | - Barbara Trzebicka
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences M. Curie-Skłodowskiej 34 Zabrze 41-819 Poland
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6
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Gorbunova M, Lemkina L, Eroshenko D, Gileva K. N
-vinylpyrrolidone copolymers decorated with silver nanoparticles for biomedical applications. POLYM ADVAN TECHNOL 2019. [DOI: 10.1002/pat.4470] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Marina Gorbunova
- Institute of Technical Chemistry; Ural Branch of Russian Academy of Sciences; Perm 614013 Russia
| | - Larisa Lemkina
- Institute of Ecology and Genetics of Microorganisms; Ural Branch of Russian Academy of Sciences; Perm 614090 Russia
| | - Daria Eroshenko
- Institute of Technical Chemistry; Ural Branch of Russian Academy of Sciences; Perm 614013 Russia
| | - Ksenya Gileva
- Institute of Technical Chemistry; Ural Branch of Russian Academy of Sciences; Perm 614013 Russia
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7
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Oukacine F, Bernard S, Bobe I, Cottet H. Physico-chemical characterization of polymeric micelles loaded with platinum derivatives by capillary electrophoresis and related methods. J Control Release 2014; 196:139-45. [DOI: 10.1016/j.jconrel.2014.09.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Revised: 09/01/2014] [Accepted: 09/22/2014] [Indexed: 11/25/2022]
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8
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Effect of monomeric sequence on transport properties of d-glucose and ascorbic acid in poly(VP-co-HEMA) hydrogels with various water contents: molecular dynamics simulation approach. Theor Chem Acc 2012. [DOI: 10.1007/s00214-012-1206-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Wang JJ, Li XS. Improved oxygen permeability and mechanical strength of silicone hydrogels with interpenetrating network structure. CHINESE JOURNAL OF POLYMER SCIENCE 2010. [DOI: 10.1007/s10118-010-9142-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Xu J, Li X, Sun F. Preparation and evaluation of a contact lens vehicle for puerarin delivery. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2010; 21:271-88. [PMID: 20178685 DOI: 10.1163/156856209x415774] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The purpose of this study is to develop a soft contact lens vehicle for puerarin delivery to alleviate glaucoma. Poly(2-hydroxy-ethyl methacrylate-co-N-vinylpyrrolidone-co-methyl acrylate) (pHEMA-NVP-MA) contact lenses were prepared by UV irradiation of HEMA, NVP and MA, to which the cross-linker, a mixture of trimethylolpropane trimethacrylate (TMPTMA) and allyl methacrylate (AMA) (1:1, w/w) was added previously. The contact lenses were characterized by equilibrium swelling ratio (ESR) and tensile tester. The results showed that incorporation of poly-N-vinylpyrrolidone (PVP) component in the hydrogels caused increase of ESR and decrease of tensile strength. Co-polymerization of MA monomer in the hydrogel led to a slight drop of ESR and improved tensile strength of hydrogel. Four kinds of hydrated contact lenses with different PVP content were presoaked in PBS solution of puerarin and the in vitro drug release was measured. The contact lenses matrix incorporated with PVP had a remarkable loading capacity of puerarin. In rabbit eyes, the presoaked contact lenses extended the mean resident time of puerarin to 77.45 min from 12.88 min of 1% puerarin eye drops. Moreover, contact lens presoaked in puerarin solution at the concentration of 0.802 mg/ml showed about the same bioavailability (AUC(0-t)) in tear fluid as that of the puerarin eye drops. This kind of presoaked contact lens has potential application as vehicle of puerarin to alleviate glaucoma.
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Affiliation(s)
- Jinku Xu
- Biomaterials and Drug Delivery Laboratories, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P.R. China
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12
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He J, Li J, Zhang Y, He Y, Sun W. Simultaneous Determination of Four Major Conjugated Cholic Acids in Dry Bile of Sus scrofa domestica Brisson by MEKC. Chromatographia 2010. [DOI: 10.1365/s10337-010-1536-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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13
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Wang J, Li X. Preparation and characterization of interpenetrating polymer network silicone hydrogels with high oxygen permeability. J Appl Polym Sci 2010. [DOI: 10.1002/app.31902] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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14
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Lee SG, Brunello GF, Jang SS, Bucknall DG. Molecular dynamics simulation study of P (VP-co-HEMA) hydrogels: Effect of water content on equilibrium structures and mechanical properties. Biomaterials 2009; 30:6130-41. [DOI: 10.1016/j.biomaterials.2009.07.035] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2009] [Accepted: 07/19/2009] [Indexed: 11/30/2022]
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15
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Lee SG, Brunello GF, Jang SS, Lee JH, Bucknall DG. Effect of Monomeric Sequence on Mechanical Properties of P(VP-co-HEMA) Hydrogels at Low Hydration. J Phys Chem B 2009; 113:6604-12. [DOI: 10.1021/jp8058867] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Seung Geol Lee
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, and School of Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0295
| | - Giuseppe F. Brunello
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, and School of Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0295
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, and School of Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0295
| | - J. Hannah Lee
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, and School of Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0295
| | - David G. Bucknall
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, and School of Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0295
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16
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Aranaz I, Gutiérrez MC, Yuste L, Rojo F, Ferrer ML, del Monte F. Controlled formation of the anhydrous polymorph of ciprofloxacin crystals embedded within chitosan scaffolds: study of the kinetic release dependence on crystal size. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b813156b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Rodríguez-Lorenzo LM, García-Carrodeguas R, Rodríguez MA, De Aza S, Jiménez J, López-Bravo A, Fernandez M, Román JS. Synthesis, characterization, bioactivity and biocompatibility of nanostructured materials based on the wollastonite-poly(ethylmethacrylate-co-vinylpyrrolidone) system. J Biomed Mater Res A 2009; 88:53-64. [DOI: 10.1002/jbm.a.31867] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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18
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Rodríguez-Lorenzo LM, Carrodeguas RG, Rodríguez MA, De Aza S, Parra J, Román JS. Development of wollastonite-poly(ethylmethacrylate co-vinylpyrrolidone) based materials for multifunctional devices. J Biomed Mater Res A 2007; 81:603-10. [PMID: 17187391 DOI: 10.1002/jbm.a.30956] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The manufacturing of a composite made of a synthetic bioactive ceramic, pseudowollastonite (psW), and a bioresorbable copolymer ethylmethacrylate-vinylpyrrolidone (EMA/VP) is presented in this article. psW porous blocks were produced by dipping an open porous polyurethane foam in a psW containing slurry. A 40/60 wt % EMA/VP monomers mixture was poured on the blocks, and free radical polymerization initiated by azobis(isobutyronitrile) at 50 degrees C. Disks of 1 mm height were obtained by cutting the composite with a diamond saw, and bioresorption and bioactivity of the specimens were tested by immersion of the disks into SBF. A ceramic/polymer weight ratio of 72/28, greater than the usually achievable ratio by polymeric solidification of slurries of monomers charged with a powdered solid component, has been obtained. The system is bioactive and does not change the pH of the medium during the degradation test.
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19
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Vorobĩeva AI, Gorbunova MN, Kolesov SV, Monakov YB. Copolymerization of N-vinylpyrrolidone with 3-methacryloyloxytetrahydrothiophene 1,1′-dioxide. RUSS J APPL CHEM+ 2006. [DOI: 10.1134/s1070427206060231] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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Cottet H, Simó C, Vayaboury W, Cifuentes A. Nonaqueous and aqueous capillary electrophoresis of synthetic polymers. J Chromatogr A 2005; 1068:59-73. [PMID: 15844543 DOI: 10.1016/j.chroma.2004.09.074] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
In this work, the use of capillary electrophoresis (CE) to analyze synthetic polymers is reviewed including works published till February 2004. The revised works have been classified depending on the CE mode (e.g., free solution capillary electrophoresis, capillary gel electrophoresis, etc.) and type of buffer (i.e., nonaqueous, aqueous and hydro-organic background electrolytes) employed to separate synthetic macromolecules. Advantages and drawbacks of these different separation procedures for polymer analysis are discussed. Also, physicochemical studies of complex polymer systems by CE are reviewed, including drug release studies, synthetic polyampholytes, dendrimers, fullerenes, carbon nanotubes and associative copolymers.
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Affiliation(s)
- Hervé Cottet
- Organisation Moléculaire, Evolution et Matériaux Fluorés, UMR CNRS 5073, Université de Montpellier 2, Case Courrier 017, Place Eugène Bataillon, 34095 Montpellier, France
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21
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Simó C, Cifuentes A, Gallardo A. Drug delivery systems: polymers and drugs monitored by capillary electromigration methods. J Chromatogr B Analyt Technol Biomed Life Sci 2003; 797:37-49. [PMID: 14630142 DOI: 10.1016/s1570-0232(03)00430-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In this paper, different electromigration methods used to monitor drugs and polymers released from drug delivery systems are reviewed. First, an introduction to the most typical arrangements used as drug delivery systems (e.g., polymer-drug covalent conjugates, membrane or matrix-based devices) is presented. Next, the principles of different capillary electromigration procedures are discussed, followed by a revision on the different procedures employed to monitor the release of drugs and the degradation or solubilization of the polymeric matrices from drug delivery systems during both in vitro and in vivo assays. A critical comparison between these capillary electrophoretic methods and the more common chromatographic methods employed to analyze drugs and polymers from drug delivery systems is presented. Finally, future outlooks of these electromigration procedures in the controlled release field are discussed.
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Affiliation(s)
- Carolina Simó
- Institute of Industrial Fermentations (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain
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22
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Filmon R, Retailleau-Gaborit N, Grizon F, Galloyer M, Cincu C, Basle MF, Chappard D. Non-connected versus interconnected macroporosity in poly(2-hydroxyethyl methacrylate) polymers. An X-ray microtomographic and histomorphometric study. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2003; 13:1105-17. [PMID: 12484487 DOI: 10.1163/156856202320813828] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Poly(2-hydroxyethyl methacrylate) (pHEMA) has potentially broad biomedical applications: it is biocompatible and has a hardness comparable to bone when bulk polymerized. Porous biomaterials allow bone integration to be increased, especially when the pores are interconnected. In this study, three types of porogens (sugar fibers, sucrose crystals, and urea beads) have been used to prepare macroporous pHEMA. The pore volume and interconnectivity parameters of the porosity were measured by X-ray microtomography and image analysis. Sucrose crystals, having a high volumetric mass, gave large pores that were located on the block sides. Urea beads and sugar fibers provided pores with the same star volume (2.65 +/- 0.46 mm3 and 2.48 +/- 0.52 mm3, respectively) but which differed in interconnectivity index, fractal dimension, and Euler-Poincarés number. Urea beads caused non-connected porosity, while sugar fibers created a dense labyrinth within the polymer. Interconnectivity was proved by carrying out surface treatment of the pHEMA (carboxymethylation in water), followed by von Kossà staining, which detected the carboxylic groups. Carboxymethylated surfaces were observed on the sides of the blocks and on the opened or interconnected pores. The disconnected pores were unstained. Macroporous polymers can be prepared with water-soluble porogens. X-ray microtomography appears a useful tool to measure porosity and interconnectedness.
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Affiliation(s)
- R Filmon
- GEROM-LHEA Laboratoire d'Histologie-Embryologie, Faculté de Médecine & CHU d'Angers, 49045 Angers, France
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Simó C, Gallardo A, San RJ, Barbas C, Cifuentes A. Fast and sensitive capillary electrophoresis method to quantitatively monitor ibuprofen enantiomers released from polymeric drug delivery systems. J Chromatogr B Analyt Technol Biomed Life Sci 2002; 767:35-43. [PMID: 11863293 DOI: 10.1016/s0378-4347(01)00533-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
In this work, the capability of two polymeric drug delivery systems (DDS) containing racemic ibuprofen (IBU) for controlled release of IBU in different media was studied carrying out assays in-vitro. To quantitatively monitor the release of R(-)- and S(+)-IBU, a fast, sensitive and inexpensive capillary electrophoresis (CE) method was developed. To do this, different chiral selectors, temperatures, buffer compositions and pHs were tested. This new CE method uses bare silica columns together with a buffer containing 6% Dextrin in a 150 mM sodium tetraborate buffer at pH 9. Baseline separations of R(-)- and S(+)-IBU were achieved in less than 5 min at 20 degrees C. By using this method, both enantiomers can be determined at concentrations as low as 1 microg/ml, allowing the detection of enantiomeric percentages of 0.5% of R(-)-IBU in the presence of 99.5% of the optical antipode. Moreover, the method shows a high reproducibility for the same day and different days. The usefulness of this method to quantitatively monitor the release of R(-)- and S(+)-IBU from two different polymeric DDS is demonstrated. It is shown that the release rate of IBU depends on the spacer of the side residue used in the polymeric device. Also, it is demonstrated that the release of both enantiomers is enzymatically activated in rat plasma.
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Affiliation(s)
- C Simó
- Inst de Fermentaciones Industriales (CSIC), Madrid, Spain
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24
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Gallardo A, Fernández F, Cifuentes A, Díez-Masa JC, Bermejo P, Rebuelta M, López-Bravo A, San Román J. Modulated release of cyclosporine from soluble vinyl pyrrolidone--hydroxyethyl methacrylate copolymer hydrogels. A correlation of 'in vitro' and 'in vivo' experiments. J Control Release 2001; 72:1-11. [PMID: 11389980 DOI: 10.1016/s0168-3659(01)00257-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Soluble, uncrosslinked and high molecular weight copolymers of vinylpyrrolidone, VP, with 2-hydroxyethyl methacrylate, HEMA, prepared by free radical copolymerization, are proposed as supports for the modulated release of the immunosuppressor cyclosporine. Two copolymeric systems with copolymer compositions f(VP)=0.52 (namely VP--HEMA 60--40) and 0.42 (VP--HEMA 40--60) have been prepared and tested in vitro and in vivo using rats as animal model. Micellar electrokinetic capillary chromatography, MEKC, has been used for the simultaneous detection of the polymer reabsorption and the drug release for the in vitro experiments. The composition and microstructural distribution of the copolymer system controls the solubilization rate which modulates the in vitro release of the drug (with time profiles from a few days to several weeks for the VP--HEMA 60--40 and 40--60, respectively) and the in vivo response that correlates with the previous in vitro results: the more hydrophobic implant (VP--HEMA 40--60) reverts the immune response more slowly (2--4 weeks) compared to the more hydrophilic one (VP--HEMA 60--40, 1--2 weeks).
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Affiliation(s)
- A Gallardo
- Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
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25
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Cifuentes A, Diez-Masa JC, Montenegro C, Rebuelta M, Gallardo A, Elvira C, Román JS. Recombinant growth hormone delivery systems based on vinylpyrrolidone-hydroxyethyl methacrylate copolymer matrices: monitoring optimization by capillary zone electrophoresis. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2001; 11:993-1005. [PMID: 11211091 DOI: 10.1163/156856200744156] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Experimental conditions for the fabrication of two new polymeric devices (i.e. films and slabs) useful for the controlled release of recombinant growth hormone (GH) are given. The release rate is controlled by the resorption profile of the vinylpyrrolidone-hydroxyethyl methacrylate (VP-HEMA) tested systems which is related to the copolymer composition. The suitability of capillary electrophoresis (CE) for following the complete preparation of the different VP-HEMA devices is shown. Moreover, CE allows simultaneous monitoring of the controlled release of GH and dissolved polymer during in vitro experiments. From these results, guidelines are given for the fabrication of polymeric devices containing protein as active drug as well as for the correct selection of conditions during in vitro experiments.
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Affiliation(s)
- A Cifuentes
- Institute of Organic Chemistry (C.S.I.C.), Madrid, Spain
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26
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Vinyl pyrrolidone–methacrylic monomers bearing salicylic acid derivative moieties: copolymerization parameters and microstructure analysis. POLYMER 2000. [DOI: 10.1016/s0032-3861(00)00094-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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