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Tagad HD, Brito J, Marin A, Buckley C, Wang H, Sun J, Sukhishvili SA, Wang H, Andrianov AK. 4-Methylumbelliferone-Functionalized Polyphosphazene and Its Assembly into Biocompatible Fluorinated Nanocoatings with Selective Antiproliferative Activity. Biomacromolecules 2023; 24:2278-2290. [PMID: 37071718 DOI: 10.1021/acs.biomac.3c00153] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2023]
Abstract
Advanced multifunctional biomaterials are increasingly relying on clinically dictated patterns of selectivity against various biological targets. Integration of these frequently conflicting features into a single material surface may be best achieved by combining various complementary methodologies. Herein, a drug with a broad spectrum of activity, i.e., 4-methylumbelliferone (4-MU), is synthetically multimerized into water-soluble anionic macromolecules with the polyphosphazene backbone. The polymer structure, composition, and solution behavior are studied by 1H and 31P NMR spectroscopy, size-exclusion chromatography, dynamic light scattering, and UV and fluorescence spectrophotometry. To take advantage of the clinically proven hemocompatibility of fluorophosphazene surfaces, the drug-bearing macromolecule was then nanoassembled onto the surface of selected substrates in an aqueous solution with fluorinated polyphosphazene of the opposite charge using the layer-by-layer (LbL) technique. Nanostructured 4-MU-functionalized fluoro-coatings exhibited a strong antiproliferative effect on vascular smooth muscle cells (VSMCs) and fibroblasts with no cytotoxicity against endothelial cells. This selectivity pattern potentially provides the opportunity for highly desirable fast tissue healing while preventing the overgrowth of VSMCs and fibrosis. Taken together with the established in vitro hemocompatibility and anticoagulant activity, 4-MU-functionalized fluoro-coatings demonstrate potential for applications as restenosis-resistant coronary stents and artificial joints.
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Affiliation(s)
- Harichandra D Tagad
- Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, Maryland 20850, United States
| | - Jordan Brito
- Department of Materials Science & Engineering, Texas A&M University, College Station, Texas 77840, United States
| | - Alexander Marin
- Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, Maryland 20850, United States
| | - Christian Buckley
- Department of Biomedical Engineering, Department of Chemistry and Chemical Biology, Center for Healthcare Innovation, Stevens Institute of Technology, Hoboken, New Jersey 07030, United States
| | - Haoyu Wang
- Department of Biomedical Engineering, Department of Chemistry and Chemical Biology, Center for Healthcare Innovation, Stevens Institute of Technology, Hoboken, New Jersey 07030, United States
| | - Jingyu Sun
- Department of Biomedical Engineering, Department of Chemistry and Chemical Biology, Center for Healthcare Innovation, Stevens Institute of Technology, Hoboken, New Jersey 07030, United States
| | - Svetlana A Sukhishvili
- Department of Materials Science & Engineering, Texas A&M University, College Station, Texas 77840, United States
| | - Hongjun Wang
- Department of Biomedical Engineering, Department of Chemistry and Chemical Biology, Center for Healthcare Innovation, Stevens Institute of Technology, Hoboken, New Jersey 07030, United States
| | - Alexander K Andrianov
- Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, Maryland 20850, United States
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2
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Singh B, Devi K, Sharma D, Sharma P. Synthesis and characterization of modified bioactive arabinoxylan-psyllium: Evaluation of molecular interactions, physiochemical and biomedical properties. Int J Biol Macromol 2022; 221:1053-1064. [PMID: 36108744 DOI: 10.1016/j.ijbiomac.2022.09.064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 08/21/2022] [Accepted: 09/07/2022] [Indexed: 11/17/2022]
Abstract
Keeping in view the future prospectus of carbohydrate polymers, present research report is an elaboration, exploration and execution of the research expectancy in area of these polymers by researchers like John F. Kennedy. Herein, molecular interactions and physiochemical properties of modified bioactive arabinoxylan-psyllium have been evaluated for drug delivery applications. Arabinoxylan-psyllium was modified with sulphated and amide copolymers and co-polymers were characterized by SEMs, AFM, FTIR, XRD, solid state 13C NMR, TGA-DSC and water absorption studies. The 13C-NMR and FTIR confirmed grafted copolymers. The polymer-blood interactions revealed non-thrombogenic nature with thrombose percentage 63.17 ± 5.61 % and polymer-mucous membrane interactions showed detachment force 0.237 ± 0.078Nwith bio-membrane in mucoadhesion test. The pH responsible gels exhibited 44.49 ± 3.12 % inhibitions of free radicals in DPPH assay. The polymer-drug interactions demonstrated sustained diffusion of methotrexate with non-Fickian diffusion and Korsmeyer-Peppas kinetic model. Overall, co-polymeric network structure was found useful in colon specific drug delivery.
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Affiliation(s)
- Baljit Singh
- Department of Chemistry, Himachal Pradesh University, Shimla 171005, India.
| | - Kavita Devi
- Department of Chemistry, Himachal Pradesh University, Shimla 171005, India
| | - Diwanshi Sharma
- Department of Chemistry, Himachal Pradesh University, Shimla 171005, India
| | - Prerna Sharma
- Department of Chemistry, Himachal Pradesh University, Shimla 171005, India
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3
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Zhang Z, Chen S, Wen M, He H, Zhang Y, Yin T, Gou J, Tang X. Alleviating the Influence of Circadian Rhythms and Drug Properties to the Release of Paliperidone Gel Matrix Tablets with Compression Coating Technology and Microenvironment Shaping. AAPS PharmSciTech 2022; 23:228. [PMID: 35974217 DOI: 10.1208/s12249-022-02388-5] [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: 04/25/2022] [Accepted: 08/04/2022] [Indexed: 11/30/2022] Open
Abstract
The influence of circadian rhythms is an important content in oral dosage form study which is shown as different pH conditions and gastrointestinal dynamics in the gastrointestinal tract. The purpose of this study was to alleviate the influence of circadian rhythms and drug properties to the release of gel matrix tablets in vitro and in vivo. In this study, the compression coating technology and microenvironment shaping were utilized to achieve the alleviation of the influence of circadian rhythms and drug properties. The compression coating technology was used to alleviate the influence of gastrointestinal dynamics, and microenvironment shaping was used to alleviate the interference of different pH condition variations. The self-made compression coating tablet could maintain a consistent release rate in different pH conditions and different dynamic environments in vitro for 24 h. In vivo, the pharmacokinetic parameters Cmax and Tmax were 3701.675 ng/mL and 24 h, respectively, and the release effect in vivo was similar to the paliperidone osmotic pump tablet with the ability to alleviate the influence of circadian rhythms. The correlation coefficient R2 was 0.9914 for the self-made paliperidone compression coating tablet in vitro-in vivo correlation. The interference caused by circadian rhythms was alleviated so that the compression coating technology with microenvironment shaping could replace the osmotic pump technology with easier preparation process and cheaper costs in vitro and in vivo and achieve the effect of alleviating the interference of circadian rhythms.
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Affiliation(s)
- Zherui Zhang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, Liaoning, People's Republic of China
| | - Shumin Chen
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, Liaoning, People's Republic of China
| | - Man Wen
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, Liaoning, People's Republic of China
| | - Haibing He
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, Liaoning, People's Republic of China
| | - Yu Zhang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, Liaoning, People's Republic of China
| | - Tian Yin
- School of Functional Food and Wine, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, Liaoning, People's Republic of China
| | - Jingxin Gou
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, Liaoning, People's Republic of China
| | - Xing Tang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, Liaoning, People's Republic of China.
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4
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Cano-Vega MA, Deng M, Pinal R. Modular solid dosage form design - Application to pH-independent release of a weak-base API. Int J Pharm 2021; 601:120518. [PMID: 33775729 DOI: 10.1016/j.ijpharm.2021.120518] [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: 12/29/2020] [Revised: 03/19/2021] [Accepted: 03/21/2021] [Indexed: 11/25/2022]
Abstract
A novel approach to solid dosage form design is investigated, whereby instead of blending the ingredients and subsequently compacting the mixture, the dosage form is made by assembling prefabricated components, each with a specific function. The approach was used to formulate a weak-base API (active pharmaceutical ingredient), such that the modular dosage forms exhibited pH-independent drug release. Tablet-like dosage forms of ciprofloxacin (CPR), used as model weak-base drug, were prepared in order to generate dosage forms exhibiting pH-independent drug release. The dosage forms were made by assembling two types of prefabricated modules onto 3D stacks. The modules were hydroxypropyl methylcellulose circular film wafers, loaded with either CPR or citric acid (CA). CA-wafers served the function of pH-modifier modules in the microenvironment of the dosage form during the dissolution process. In vitro drug release from dosage forms consisting of CA- and CPR-wafers stacked in alternate sequence was compared with the release from assemblies containing CPR-wafers only, under pH = 1.2 and pH = 6.8 conditions. In the absence of CA-wafers, CPR release was ~25-fold slower at pH = 6.8 compared to pH = 1.2. Inclusion of CA-wafers in the dosage form assembly accelerated and decelerated drug release at pH = 6.8 and pH = 1.2, respectively, which resulted in overlapping drug release profiles under the two pH conditions. The two drug release profiles met the criteria for sameness as assessed by the f1 (difference) and f2 (similarity) factors. Modeling of drug release kinetics pointed toward polymer erosion as the primary mechanism of drug release for the overlapping pH = 1.2 and pH = 6.8 profiles. In terms of their drug release properties, the multi-modular dosage form assemblies exhibited the attributes and behavior of single bodies, rather than the combined contributions from multiple individually-operating modules. The initial geometry of the dosage form, characterized by the surface area (SA), volume (V) and SA/V ratio accounted for drug release kinetics in the same fashion as for traditional tablet compacts.
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Affiliation(s)
- Mario A Cano-Vega
- Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN, USA; Bindley Bioscience Center, Purdue University, West Lafayette, IN, USA
| | - Meng Deng
- Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN, USA; Bindley Bioscience Center, Purdue University, West Lafayette, IN, USA; School of Materials Engineering, Purdue University, West Lafayette, IN, USA; Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, USA
| | - Rodolfo Pinal
- Department of Industrial and Physical Pharmacy, Purdue University, West Lafayette, IN, USA.
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Hoppe Alvarez L, Rudov AA, Gumerov RA, Lenssen P, Simon U, Potemkin II, Wöll D. Controlling microgel deformation via deposition method and surface functionalization of solid supports. Phys Chem Chem Phys 2021; 23:4927-4934. [PMID: 33620358 DOI: 10.1039/d0cp06355j] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Soft matter at solid-liquid interfaces plays an important role in multiple scientific disciplines as well as in various technological fields. For microgels, representing highly interesting soft matter systems, we demonstrate that the preparation method, i.e. the way how the microgel is applied to the specific surface, plays a key role. Focusing on the three most common sample preparation methods (spin-coating, drop-casting and adsorption from solution), we performed a comparative study of the deformation behavior of microgels at the solid-liquid interface on three different surfaces with varying hydrophilicities. For in situ visualization of the deformation of pNIPMAM microgels, we conducted highly sensitive 3D super resolution fluorescence microscopy methods. We furthermore performed complementary molecular dynamics simulations to determine the driving force responsible for the deformation depending on the surface and the deposition method. The combination of experiments and simulations revealed that the simulated equilibrium structure obtained after simulation of the completely dry microgel after deposition is retained after rehydration and subsequent fluorescent imaging.
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Affiliation(s)
- Laura Hoppe Alvarez
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, D-52056 Aachen, Germany.
| | - Andrey A Rudov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation and DWI - Leibniz-Institute for Interactive Materials, Forckenbeckstraße 50, D-52056 Aachen, Germany
| | - Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation and DWI - Leibniz-Institute for Interactive Materials, Forckenbeckstraße 50, D-52056 Aachen, Germany
| | - Pia Lenssen
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, D-52056 Aachen, Germany.
| | - Ulrich Simon
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1 a, D-52056 Aachen, Germany
| | - Igor I Potemkin
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation and DWI - Leibniz-Institute for Interactive Materials, Forckenbeckstraße 50, D-52056 Aachen, Germany and National Research South Ural State University, Chelyabinsk 454080, Russian Federation
| | - Dominik Wöll
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, D-52056 Aachen, Germany.
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Bermejo M, Sanchez-Dengra B, Gonzalez-Alvarez M, Gonzalez-Alvarez I. Oral controlled release dosage forms: dissolution versus diffusion. Expert Opin Drug Deliv 2020; 17:791-803. [DOI: 10.1080/17425247.2020.1750593] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Marival Bermejo
- Department of Engineering, Pharmacokinetics and Pharmaceutical Technology Area, Miguel Hernandez University, Elche, Spain
| | - Barbara Sanchez-Dengra
- Department of Engineering, Pharmacokinetics and Pharmaceutical Technology Area, Miguel Hernandez University, Elche, Spain
| | - Marta Gonzalez-Alvarez
- Department of Engineering, Pharmacokinetics and Pharmaceutical Technology Area, Miguel Hernandez University, Elche, Spain
| | - Isabel Gonzalez-Alvarez
- Department of Engineering, Pharmacokinetics and Pharmaceutical Technology Area, Miguel Hernandez University, Elche, Spain
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7
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Hoppe Alvarez L, Eisold S, Gumerov RA, Strauch M, Rudov AA, Lenssen P, Merhof D, Potemkin II, Simon U, Wöll D. Deformation of Microgels at Solid-Liquid Interfaces Visualized in Three-Dimension. NANO LETTERS 2019; 19:8862-8867. [PMID: 31642321 DOI: 10.1021/acs.nanolett.9b03688] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Solid-liquid interfaces play an important role for functional devices. Hence, a detailed understanding of the interaction of soft matter objects with solid supports and of the often concomitant structural deformations is of great importance. We address this topic in a combined experimental and simulation approach. We investigated thermoresponsive poly(N-isopropylmethacrylamide) microgels (μGs) at different surfaces in an aqueous environment. As super-resolution fluorescence imaging method, three-dimensional direct stochastical optical reconstruction microscopy (dSTORM) allowed for visualizing μGs in their three-dimensional (3D) shape, for example, in a "fried-egg" conformation depending on the hydrophilicity of the surface (strength of adsorption). The 3D shape, as defined by point clouds obtained from single-molecule localizations, was analyzed. A new fitting algorithm yielded an isosurface of constant density which defines the deformation of μGs at the different surfaces. The presented methodology quantifies deformation of objects with fuzzy surfaces and allows for comparison of their structures, whereby it is completely independent from the data acquisition method. Finally, the experimental data are complemented with mesoscopic computer simulations in order to (i) rationalize the experimental results and (ii) to track the evolution of the shape with changing surface hydrophilicity; a good correlation of the shapes obtained experimentally and with computer simulations was found.
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Affiliation(s)
- Laura Hoppe Alvarez
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , D-52056 Aachen , Germany
| | - Sabine Eisold
- Institute of Inorganic Chemistry , RWTH Aachen University , Landoltweg 1 a , D-52056 Aachen , Germany
| | - Rustam A Gumerov
- Physics Department , Lomonosov Moscow State University , Leninskie Gory 1-2 , Moscow 119991 , Russian Federation
- DWI - Leibniz-Institute for Interactive Materials , Forckenbeckstraße 50 , D-52056 Aachen , Germany
| | - Martin Strauch
- Institute of Imaging and Computer Vision , RWTH Aachen University , Kopernikusstraße 16 , 52074 Aachen , Germany
| | - Andrey A Rudov
- Physics Department , Lomonosov Moscow State University , Leninskie Gory 1-2 , Moscow 119991 , Russian Federation
- DWI - Leibniz-Institute for Interactive Materials , Forckenbeckstraße 50 , D-52056 Aachen , Germany
| | - Pia Lenssen
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , D-52056 Aachen , Germany
| | - Dorit Merhof
- Institute of Imaging and Computer Vision , RWTH Aachen University , Kopernikusstraße 16 , 52074 Aachen , Germany
| | - Igor I Potemkin
- Physics Department , Lomonosov Moscow State University , Leninskie Gory 1-2 , Moscow 119991 , Russian Federation
- DWI - Leibniz-Institute for Interactive Materials , Forckenbeckstraße 50 , D-52056 Aachen , Germany
- National Research South Ural State University , Chelyabinsk 454080 , Russian Federation
| | - Ulrich Simon
- Institute of Inorganic Chemistry , RWTH Aachen University , Landoltweg 1 a , D-52056 Aachen , Germany
| | - Dominik Wöll
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , D-52056 Aachen , Germany
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8
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Xi Z, Sharma N, Paprikar A, Lin S. Development and evaluation of dipyridamole sustained release tablets containing micro-environmental pH modifiers. J Drug Deliv Sci Technol 2019. [DOI: 10.1016/j.jddst.2019.101231] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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9
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Panizzon GP, Giacomini Bueno F, Ueda-Nakamura T, Nakamura CV, Dias Filho BP. Manufacturing Different Types of Solid Dispersions of BCS Class IV Polyphenol (Daidzein) by Spray Drying: Formulation and Bioavailability. Pharmaceutics 2019; 11:E492. [PMID: 31557831 PMCID: PMC6835336 DOI: 10.3390/pharmaceutics11100492] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 09/13/2019] [Accepted: 09/16/2019] [Indexed: 12/22/2022] Open
Abstract
Daidzein (DZ) is a polyphenolic compound belonging to Biopharmaceutical Classification System class IV, which shows that it may have limited therapeutic effects due to its low solubility and poor bioavailability. This study aimed to obtain high-purity DZ and prepare and characterize different types of solid dispersions (SDs) in order to enhance aqueous solubility and bioavailability. Excipients were investigated in order to manufacture different types of solid dispersions (SDs). Second-generation solid dispersions (SG), third-generation solid dispersions (TG), and second- and third-generation pH-modulated solid dispersions (SD and TG pHM-SD) were produced via spray drying. The SDs were characterized and tested for in vitro DZ release and oral bioavailability. SDs have shown increased aqueous solubility and in vitro release rate. Solid-state characterization showed that DZ was in an amorphous state in most of the formulations. The enhanced aqueous solubility of TG-pHM SD was reflected by an increase in oral bioavailability, which significantly increased the maximum plasma concentration approximately 20-fold and decreased the time to reach the maximum plasma concentration. The production of pHM SDs that contain DZ via spray drying is a simple and effective approach for oral drug delivery, which has the potential to greatly reduce the dose and enhance therapeutics effects.
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Affiliation(s)
- Gean Pier Panizzon
- Post-graduate Program in Pharmaceutical Sciences, Laboratory of Technological Innovation in the Development of Drugs and Cosmetics, State University of Maringá, Maringá 87020-900, Paraná, Brazil.
| | - Fernanda Giacomini Bueno
- Medical and Pharmaceutical Sciences Center, Western Paraná State University, Cascavel 85819-110, Paraná, Brazil.
| | - Tânia Ueda-Nakamura
- Post-graduate Program in Pharmaceutical Sciences, Laboratory of Technological Innovation in the Development of Drugs and Cosmetics, State University of Maringá, Maringá 87020-900, Paraná, Brazil.
| | - Celso Vataru Nakamura
- Post-graduate Program in Pharmaceutical Sciences, Laboratory of Technological Innovation in the Development of Drugs and Cosmetics, State University of Maringá, Maringá 87020-900, Paraná, Brazil.
| | - Benedito Prado Dias Filho
- Post-graduate Program in Pharmaceutical Sciences, Laboratory of Technological Innovation in the Development of Drugs and Cosmetics, State University of Maringá, Maringá 87020-900, Paraná, Brazil.
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Fabrication of HPMC and Hibiscus esculentus (okra) gum based microspheres loaded with sulfasalazine and dexamethasone. JOURNAL OF POLYMER RESEARCH 2019. [DOI: 10.1007/s10965-019-1788-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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11
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Mergel O, Schneider S, Tiwari R, Kühn PT, Keskin D, Stuart MCA, Schöttner S, de Kanter M, Noyong M, Caumanns T, Mayer J, Janzen C, Simon U, Gallei M, Wöll D, van Rijn P, Plamper FA. Cargo shuttling by electrochemical switching of core-shell microgels obtained by a facile one-shot polymerization. Chem Sci 2019; 10:1844-1856. [PMID: 30842853 PMCID: PMC6371888 DOI: 10.1039/c8sc04369h] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 12/02/2018] [Indexed: 12/14/2022] Open
Abstract
Controlling and understanding the electrochemical properties of electroactive polymeric colloids is a highly topical but still a rather unexplored field of research. This is especially true when considering more complex particle architectures like stimuli-responsive microgels, which would entail different kinetic constraints for charge transport within one particle. We synthesize and electrochemically address dual stimuli responsive core-shell microgels, where the temperature-responsiveness modulates not only the internal structure, but also the microgel electroactivity both on an internal and on a global scale. In detail, a facile one-step precipitation polymerization results in architecturally advanced poly(N-isopropylacrylamide-co-vinylferrocene) P(NIPAM-co-VFc) microgels with a ferrocene (Fc)-enriched (collapsed/hard) core and a NIPAM-rich shell. While the remaining Fc units in the shell are electrochemically accessible, the electrochemical activity of Fc in the core is limited due to the restricted mobility of redox active sites and therefore restricted electron transfer in the compact core domain. Still, prolonged electrochemical action and/or chemical oxidation enable a reversible adjustment of the internal microgel structure from core-shell microgels with a dense core to completely oxidized microgels with a highly swollen core and a denser corona. The combination of thermo-sensitive and redox-responsive units being part of the network allows for efficient amplification of the redox response on the overall microgel dimension, which is mainly governed by the shell. Further, it allows for an electrochemical switching of polarity (hydrophilicity/hydrophobicity) of the microgel, enabling an electrochemically triggered uptake and release of active guest molecules. Hence, bactericidal drugs can be released to effectively kill bacteria. In addition, good biocompatibility of the microgels in cell tests suggests suitability of the new microgel system for future biomedical applications.
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Affiliation(s)
- Olga Mergel
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , 52056 Aachen , Germany
- Department of Biomedical Engineering-FB40 , University of Groningen , University Medical Center Groningen , A. Deusinglaan 1 , Groningen , 9713 AV , The Netherlands
| | - Sabine Schneider
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , 52056 Aachen , Germany
| | - Rahul Tiwari
- DWI - Leibniz Institute for Interactive Materials , RWTH Aachen University , Forckenbeckstraße 50 , 52056 Aachen , Germany
| | - Philipp T Kühn
- Department of Biomedical Engineering-FB40 , University of Groningen , University Medical Center Groningen , A. Deusinglaan 1 , Groningen , 9713 AV , The Netherlands
| | - Damla Keskin
- Department of Biomedical Engineering-FB40 , University of Groningen , University Medical Center Groningen , A. Deusinglaan 1 , Groningen , 9713 AV , The Netherlands
| | - Marc C A Stuart
- Groningen Biomolecular Sciences and Biotechnology Institute , Stratingh Institute for Chemistry , University of Groningen , Nijenborgh 7 , 9747 AG Groningen , The Netherlands
| | - Sebastian Schöttner
- Ernst-Berl-Institute for Chemical Engineering and Macromolecular Chemistry , Technische Universität Darmstadt , Alarich-Weiss-Straße 4 , D-64287 Darmstadt , Germany
| | - Martinus de Kanter
- Chair for Laser Technology LLT , RWTH Aachen University , Steinbachstr. 15 , 52074 Aachen , Germany
| | - Michael Noyong
- Institute of Inorganic Chemistry , JARA-SOFT , RWTH Aachen University , Landoltweg 1 , 52056 Aachen , Germany
| | - Tobias Caumanns
- GFE Central Facility for Electron Microscopy , RWTH Aachen University , Ahornstraße 55 , D-52074 Aachen , Germany
| | - Joachim Mayer
- GFE Central Facility for Electron Microscopy , RWTH Aachen University , Ahornstraße 55 , D-52074 Aachen , Germany
| | - Christoph Janzen
- Fraunhofer Institute for Laser Technology (ILT) , Steinbachstr. 15 , 52074 Aachen , Germany
| | - Ulrich Simon
- Institute of Inorganic Chemistry , JARA-SOFT , RWTH Aachen University , Landoltweg 1 , 52056 Aachen , Germany
| | - Markus Gallei
- Ernst-Berl-Institute for Chemical Engineering and Macromolecular Chemistry , Technische Universität Darmstadt , Alarich-Weiss-Straße 4 , D-64287 Darmstadt , Germany
| | - Dominik Wöll
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , 52056 Aachen , Germany
| | - Patrick van Rijn
- Department of Biomedical Engineering-FB40 , University of Groningen , University Medical Center Groningen , A. Deusinglaan 1 , Groningen , 9713 AV , The Netherlands
| | - Felix A Plamper
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , 52056 Aachen , Germany
- Institute of Physical Chemistry , TU Bergakademie Freiberg , Leipziger Straße 29 , 09599 Freiberg , Germany . ; ; Tel: +49-3731-39-2139
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12
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Comparing human peritoneal fluid and phosphate-buffered saline for drug delivery: do we need bio-relevant media? Drug Deliv Transl Res 2018; 8:708-718. [PMID: 29582351 DOI: 10.1007/s13346-018-0513-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
An understanding of biological fluids at the site of administration is important to predict the fate of drug delivery systems in vivo. Little is known about peritoneal fluid; therefore, we have investigated this biological fluid and compared it to phosphate-buffered saline, a synthetic media commonly used for in vitro evaluation of intraperitoneal drug delivery systems. Human peritoneal fluid samples were analysed for electrolyte, protein and lipid levels. In addition, physicochemical properties were measured alongside rheological parameters. Significant inter-patient variations were observed with regard to pH (p < 0.001), buffer capacity (p < 0.05), osmolality (p < 0.001) and surface tension (p < 0.05). All the investigated physicochemical properties of peritoneal fluid differed from phosphate-buffered saline (p < 0.001). Rheological examination of peritoneal fluid demonstrated non-Newtonian shear thinning behaviour and predominantly exhibited the characteristics of an entangled network. Inter-patient and inter-day variability in the viscosity of peritoneal fluid was observed. The solubility of the local anaesthetic lidocaine in peritoneal fluid was significantly higher (p < 0.05) when compared to phosphate-buffered saline. Interestingly, the dissolution rate of lidocaine was not significantly different between the synthetic and biological media. Importantly, and with relevance to intraperitoneal drug delivery systems, the sustained release of lidocaine from a thermosensitive gel formulation occurred at a significantly faster rate into peritoneal fluid. Collectively, these data demonstrate the variation between commonly used synthetic media and human peritoneal fluid. The differences in drug release rates observed illustrate the need for bio-relevant media, which ultimately would improve in vitro-in vivo correlation.
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Analysis of the Postoperative Periarticular Environment and Influence on Sustained Drug Delivery From a Gel Formulation. J Pharm Sci 2018; 107:2399-2403. [DOI: 10.1016/j.xphs.2018.05.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Revised: 05/07/2018] [Accepted: 05/09/2018] [Indexed: 11/16/2022]
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Huang J, Lin H, Peng B, Huang Q, Shuai F, Xie Y. Design and Evaluation of Hydrophilic Matrix System for pH-Independent Sustained Release of Weakly Acidic Poorly Soluble Drug. AAPS PharmSciTech 2018; 19:2144-2154. [PMID: 29714000 DOI: 10.1208/s12249-018-1008-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2018] [Accepted: 03/29/2018] [Indexed: 02/07/2023] Open
Abstract
The aim of this research was to design and evaluate a hydrophilic matrix system for sustained release of glipizide, a weakly acidic poor soluble drug. A combination of inclusion complexation and microenvironmental pH modification techniques was utilized to improve the dissolution and pH-independent release of glipizide. Hydroxypropyl-β-cyclodextrin (HP-β-CD) was used as the complexation agent while sodium citrate and magnesium oxide (MgO) were used as model pH modifiers. The hydrophilic matrix tablets were prepared by powder direct compression and evaluated by in vitro dissolution study respectively in pH 6.8 and pH 1.2 dissolution media. The formulations containing MgO exhibited increased cumulative drug release from less than 40% in the reference formulation to 90% within 24 h in acidic media (pH 1.2). The release profile in acidic media was similar to the alkaline media (pH 6.8) with a similarity factor (f2) of 55.0, suggesting the weakening of the effect of pH on the dissolution efficiency of glipizide. The release profile fitted well into the Higuchi model and the dominant mechanism of drug release was Fickian diffusion while case II transport/polymer relaxation occurred. In conclusion, combining inclusion complexation agents and pH modifiers had improved the dissolution of glipizide as well as achieved the pH-independent release profile.
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15
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Ibuprofen Release from Poly(ethyl cyanoacrylate) Nanoparticles Prepared by Semicontinuous Heterophase Polymerization. INT J POLYM SCI 2018. [DOI: 10.1155/2018/4527203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Ibuprofen-loaded poly(ethyl cyanoacrylate) nanoparticles were prepared by semicontinuous heterophase polymerization of ethyl cyanoacrylate in the presence of ibuprofen; different surfactant concentration, pH, and temperature were used. Particle size was measured by quasi-light scattering and transmission electron microscopy, while the amount of drug released was determined by UV spectroscopy. Nanoparticles with diameters between 10 and 58 nm, loaded with ibuprofen, were obtained. The smallest particles and the higher drug loading were obtained at the highest pH tested. The analysis of the release data showed that the drug release profiles correspond to the Weibull model. Moreover, it was found that most of the ibuprofen is released within the first 80–120 min; initially the release rate is slow, but then it increases to finally decrease. This behavior contrasts with the reported burst of drug concentration in the plasma after oral administration of IB.
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16
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Alves L, Lindman B, Klotz B, Böttcher A, Haake HM, Antunes FE. On the rheology of mixed systems of hydrophobically modified polyacrylate microgels and surfactants: Role of the surfactant architecture. J Colloid Interface Sci 2017; 513:489-496. [PMID: 29179089 DOI: 10.1016/j.jcis.2017.11.047] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 11/15/2017] [Accepted: 11/16/2017] [Indexed: 11/18/2022]
Abstract
HYPOTHESIS The rheological control of suspensions is of key interest in the formulation design. A chemically cross-linked hydrophobically modified poly(acrylic acid) (HMCL-PAA), used as rheology modifier, is pH sensitive and shows swelling behavior above a critical pH due to the ionization of the acrylic acid groups. At low pH, HMCL-PAA suspensions are liquid and turbid. The binding of surfactants to HMCL-PAA, at low pH conditions, can result in significant changes on rheology and transparency of the polymeric suspensions, due to the swelling of the microgel particles. EXPERIMENTS The influence of surfactants addition on the rheological properties and transparency of HMCL-PAA suspensions was determined. A systematic study was performed using different types of surfactants (ionic, non-ionic and zwitterionic). FINDINGS The gelation efficiency of HMCL-PAA suspensions at low pH is strongly dependent on surfactant architecture: ionic surfactants are found to be much more efficient than non-ionic or zwitterionic surfactants. Ionic surfactants lead to a liquid-to-gel transition accompanied by an increase of transparency of the suspensions. Among the ionic surfactants, anionics show stronger interactions with the polymer. Also the surfactant hydrophobicity is relevant; the more hydrophobic the surfactant, the stronger is the binding to the polymer and thus the larger the particle swelling.
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Affiliation(s)
- Luís Alves
- CQC, University of Coimbra, Department of Chemistry, 3004-535 Coimbra, Portugal.
| | - Björn Lindman
- CQC, University of Coimbra, Department of Chemistry, 3004-535 Coimbra, Portugal; Division of Physical Chemistry, Department of Chemistry, Center for Chemistry and Chemical Engineering, Lund University, SE-221 00 Lund, Sweden; FSCN, Fibre Science and Communication Network, Mid-Sweden University, Sundsvall, Sweden
| | - Björn Klotz
- BASF Personal Care and Nutrition GmbH, Düsseldorf, Germany
| | - Axel Böttcher
- BASF Personal Care and Nutrition GmbH, Düsseldorf, Germany
| | | | - Filipe E Antunes
- CQC, University of Coimbra, Department of Chemistry, 3004-535 Coimbra, Portugal.
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Rudov AA, Gelissen APH, Lotze G, Schmid A, Eckert T, Pich A, Richtering W, Potemkin II. Intramicrogel Complexation of Oppositely Charged Compartments As a Route to Quasi-Hollow Structures. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00553] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Andrey A. Rudov
- Physics
Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
- DWI—Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, Aachen 52056, Germany
| | | | - Gudrun Lotze
- High
Brilliance Beamline ID02, ESRF—The European Synchrotron, 71, Avenue des Martyrs, CS40220, 38043 Grenoble Cedex 9, France
| | - Andreas Schmid
- Institute of Physical Chemistry, RWTH Aachen University, Aachen 52056, Germany
| | - Thomas Eckert
- Institute of Physical Chemistry, RWTH Aachen University, Aachen 52056, Germany
| | - Andrij Pich
- DWI—Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, Aachen 52056, Germany
- Institute
of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen 52056, Germany
| | - Walter Richtering
- Institute of Physical Chemistry, RWTH Aachen University, Aachen 52056, Germany
| | - Igor I. Potemkin
- Physics
Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
- DWI—Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, Aachen 52056, Germany
- National Research South Ural State University, Chelyabinsk 454080, Russian Federation
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Mašková E, Kubová K, Vysloužil J, Pavloková S, Vetchý D. Influence of pH Modulation on Dynamic Behavior of Gel Layer and Release of Weakly Basic Drug from HPMC/Wax Matrices, Controlled by Acidic Modifiers Evaluated by Multivariate Data Analysis. AAPS PharmSciTech 2017; 18:1242-1253. [PMID: 27474035 DOI: 10.1208/s12249-016-0588-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 07/04/2016] [Indexed: 11/30/2022] Open
Abstract
The solubility of weakly basic drugs in passage through gastrointestinal tract leads to their pH-dependent release from extended release formulations and to lower drug absorption and bioavailability. The aim of this study was to modulate the micro-environmental pH of hypromellose/montanglycol wax matrices and to observe its influence on the release of weakly basic drug verapamil hydrochloride (VH) with a pH-dependent solubility with respect to gel layer formation and its dynamics. For this study, malic and succinic acids differing in their solubility and pKa were selected as pH modifiers. The dissolution studies were performed by the method of changing pH. Within the same conditions, pH, thickness, and penetration force of the gel layer were measured as well. From the PCA sub-model, it is evident that a higher acid concentration ensured lower gel pH and conditions for higher drug solubility, thus creating larger gel layer with smaller rigidity, resulting in higher VH release during the dissolution test. Incorporation of stronger and more soluble malic acid (100 mg/tablet) created the most acidic and the thickest gel layer through which a total of 74% of VH was released. Despite having lower strength and solubility, matrices containing succinic acid (100 mg/tablet) released a comparable 71% of VH in a manner close to zero-order kinetics. The thinner and less rigid gel layers of the succinic acid matrices allowed an even slightly faster VH release at pH 6.8 than from matrices containing malic acid. Thus acid solubility is more parametrically significant than acid pKa for drug release at pH 6.8.
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19
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Pygall S, Kujawinski S, Timmins P, Melia C. Extended release of flurbiprofen from tromethamine-buffered HPMC hydrophilic matrix tablets. Pharm Dev Technol 2017; 23:874-881. [PMID: 28298171 DOI: 10.1080/10837450.2017.1301470] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The pH-dependent solubility of a drug can lead to pH-dependent drug release from hydrophilic matrix tablets. Adding buffer salts to the formulation to attempt to mitigate this can impair matrix hydration and negatively impact drug release. An evaluation of the buffering of hydrophilic matrix tablets containing a pH-dependent solubility weak acid drug (flurbiprofen), identified as possessing a deleterious effect on hydroxypropyl methylcellulose (HPMC) solubility, swelling and gelation, with respect to drug dissolution and the characteristics of the hydrophilic matrix gel layer in the presence of tromethamine as a buffer was undertaken. The inclusion of tromethamine as an alkalizing agent afforded pH-independent flurbiprofen release from matrices based on both HPMC 2910 (E series) and 2208 (K series), while concomitantly decreasing the apparent critical effect on dissolution mediated by this drug with respect to the early pseudo-gel layer formation and functionality. Drug release profiles were unaffected by matrix pH-changes resulting from loss of tromethamine over time, suggesting that HPMC inhibited precipitation of drug from supersaturated solution in the hydrated matrix. We propose that facilitation of diffusion-based release of potentially deleterious drugs in hydrophilic matrices may be achieved through judicious selection of a buffering species.
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Affiliation(s)
- Samuel Pygall
- a Department of Pharmacy , University of Nottingham , Nottingham , UK.,b Commercial Trade Channels , Merck Sharp and Dohme Ltd , Hoddesdon , UK
| | - Sarah Kujawinski
- a Department of Pharmacy , University of Nottingham , Nottingham , UK.,c SarKon Ltd , Llanelli , UK
| | - Peter Timmins
- d Drug Product Science and Technology , Bristol-Myers Squibb Pharmaceuticals Ltd , Moreton , UK.,e Department of Pharmacy , University of Huddersfield , Huddersfield, UK
| | - Colin Melia
- a Department of Pharmacy , University of Nottingham , Nottingham , UK
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20
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Kasashima Y, Uchida S, Yoshihara K, Yasuji T, Sako K, Namiki N. Oral sustained-release suspension based on a lauryl sulfate salt/complex. Int J Pharm 2016; 515:677-683. [PMID: 27765725 DOI: 10.1016/j.ijpharm.2016.10.032] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Revised: 09/25/2016] [Accepted: 10/16/2016] [Indexed: 11/24/2022]
Abstract
The objective of this study was to evaluate the feasibility of lauryl sulfate (LS) salt/complex as a novel carrier in oral sustained-release suspensions. Mirabegron, which has a pH-dependent solubility, was selected as the model drug. Sodium lauryl sulfate (SLS) was bound to mirabegron in a stoichiometric manner to form an LS salt/complex. LS salt/complex formulation significantly reduced the solubility of mirabegron and helped mirabegron achieve sustained-release over a wide range of pH conditions. Microparticles containing the LS salt/complex were prepared by spray drying with the aqueous dispersion of ethylcellulose (Aquacoat® ECD). The diameter of the microparticles was less than 200μm, which will help avoid a gritty taste. In vitro results indicated the microparticles had slower dissolution profiles than the LS salt/complex. The dissolution rate could be controlled flexibly by changing the amount of Aquacoat® ECD. The microparticle suspension retained the desired sustained-release property and dissolution profile after being stored for 30days at 40°C. In addition, the suspension displayed sustained-release behavior in dogs without a pronounced Cmax peak, which will help prevent side effects. These results suggest that microparticles containing LS salt/complex may be useful as a novel sustained-release suspension for oral delivery.
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Affiliation(s)
- Yuuki Kasashima
- Pharmaceutical and Technology Labs, Astellas Pharma Inc., 180 Ozumi, Yaizu, Shizuoka 425-0072, Japan; Department of Pharmacy Practice and Science, School of Pharmaceutical Sciences University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Shinya Uchida
- Department of Pharmacy Practice and Science, School of Pharmaceutical Sciences University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
| | - Keiichi Yoshihara
- Pharmaceutical and Technology Labs, Astellas Pharma Inc., 180 Ozumi, Yaizu, Shizuoka 425-0072, Japan
| | - Takehiko Yasuji
- Pharmaceutical and Technology Labs, Astellas Pharma Inc., 180 Ozumi, Yaizu, Shizuoka 425-0072, Japan
| | - Kazuhiro Sako
- Pharmaceutical and Technology Labs, Astellas Pharma Inc., 180 Ozumi, Yaizu, Shizuoka 425-0072, Japan
| | - Noriyuki Namiki
- Department of Pharmacy Practice and Science, School of Pharmaceutical Sciences University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
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21
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Kasashima Y, Yoshihara K, Yasuji T, Sako K, Uchida S, Namiki N. Oral Sustained Release of a Hydrophilic Drug Using the Lauryl Sulfate Salt/Complex. Chem Pharm Bull (Tokyo) 2016; 64:1304-9. [DOI: 10.1248/cpb.c16-00271] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Yuuki Kasashima
- Pharmaceutical and Technology Labs, Astellas Pharma Inc
- Department of Pharmacy Practice and Science, School of Pharmaceutical Sciences University of Shizuoka
| | | | | | - Kazuhiro Sako
- Pharmaceutical and Technology Labs, Astellas Pharma Inc
| | - Shinya Uchida
- Department of Pharmacy Practice and Science, School of Pharmaceutical Sciences University of Shizuoka
| | - Noriyuki Namiki
- Department of Pharmacy Practice and Science, School of Pharmaceutical Sciences University of Shizuoka
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22
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Wulff R, Rappen GM, Koziolek M, Garbacz G, Leopold C. Controlled release of acidic drugs in compendial and physiological hydrogen carbonate buffer from polymer blend-coated oral solid dosage forms. Eur J Pharm Sci 2015; 77:246-53. [DOI: 10.1016/j.ejps.2015.06.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 06/10/2015] [Accepted: 06/16/2015] [Indexed: 01/16/2023]
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23
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Schroeder R, Rudov AA, Lyon LA, Richtering W, Pich A, Potemkin II. Electrostatic Interactions and Osmotic Pressure of Counterions Control the pH-Dependent Swelling and Collapse of Polyampholyte Microgels with Random Distribution of Ionizable Groups. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b01305] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ricarda Schroeder
- DWI−Leibniz Institute for Interactive Materials e.V., Aachen 52056, Germany
- Functional
and Interactive Polymers, Institute of Technical and Macromolecular
Chemistry, RWTH Aachen University, Aachen 52056, Germany
| | - Andrey A. Rudov
- DWI−Leibniz Institute for Interactive Materials e.V., Aachen 52056, Germany
- Physics
Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - L. Andrew Lyon
- Schmid
College of Science and Technology, Chapman University, Orange, California 92866, United States
| | - Walter Richtering
- Institute
of Physical Chemistry, RWTH Aachen University, Aachen 52056, Germany
| | - Andrij Pich
- DWI−Leibniz Institute for Interactive Materials e.V., Aachen 52056, Germany
- Functional
and Interactive Polymers, Institute of Technical and Macromolecular
Chemistry, RWTH Aachen University, Aachen 52056, Germany
| | - Igor I. Potemkin
- DWI−Leibniz Institute for Interactive Materials e.V., Aachen 52056, Germany
- Physics
Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
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25
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Phaechamud T, Darunkaisorn W. Drug release behavior of polymeric matrix filled in capsule. Saudi Pharm J 2015; 24:627-634. [PMID: 27829804 PMCID: PMC5094431 DOI: 10.1016/j.jsps.2015.04.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 04/27/2015] [Indexed: 11/08/2022] Open
Abstract
A single unit sustainable drug release system was developed using hydroxypropyl methylcellulose (HPMC)-based matrices filled in capsule as the drug delivery device. Release behavior of propranolol HCl from these capsules was investigated and least square fitting was performed for the dissolution data with the different mathematical expressions. Effect of diluent, polymer, pH and hydrodynamic force on the drug release from the developed systems was investigated. The utilization of HPMC as a matrix former extended the drug release longer than 8 h. HPMC viscosity grades affected the drug release, that is, increasing the amount of fillers such as lactose and dibasic calcium phosphate enhanced the drug release rate of HPMC matrices. The hydrodynamic force, type and amount of incorporated polymer apparently influenced the drug release. The physiochemical properties of polymers and interaction between HPMC and other polymers were important factors for prolongation of the drug release. The release mechanism from HPMC-based matrices in capsules was the non-Fickian transport in which the sustainable drug release of HPMC capsules could be achieved by the addition of polymeric matrix.
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Affiliation(s)
- Thawatchai Phaechamud
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Silpakorn University, Nakorn Pathom 73000, Thailand
| | - Wanwilai Darunkaisorn
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Silpakorn University, Nakorn Pathom 73000, Thailand
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26
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Bock DC, Takeuchi KJ, Marschilok AC, Takeuchi ES. Structural and silver/vanadium ratio effects on silver vanadium phosphorous oxide solution formation kinetics: Impact on battery electrochemistry. Phys Chem Chem Phys 2015; 17:2034-42. [DOI: 10.1039/c4cp04819a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This study contains the first kinetic analyses of silver and vanadium solution formation from Ag0.48VOPO4·1.9H2O and Ag2VP2O8, in a non-aqueous battery electrolyte. The results presented here provide a framework for the quantitative and kinetic analyses of the dissolution of cathode materials which will aid the broader community in more fully understanding this battery failure mechanism.
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Affiliation(s)
- David C. Bock
- Department of Chemistry
- Stony Brook University
- Stony Brook
- USA
| | - Kenneth J. Takeuchi
- Department of Chemistry
- Stony Brook University
- Stony Brook
- USA
- Department of Materials Science and Engineering
| | - Amy C. Marschilok
- Department of Chemistry
- Stony Brook University
- Stony Brook
- USA
- Department of Materials Science and Engineering
| | - Esther S. Takeuchi
- Department of Chemistry
- Stony Brook University
- Stony Brook
- USA
- Department of Materials Science and Engineering
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Mackiewicz M, Kaniewska K, Romanski J, Augustin E, Stojek Z, Karbarz M. Stable and degradable microgels linked with cystine for storing and environmentally triggered release of drugs. J Mater Chem B 2015; 3:7262-7270. [DOI: 10.1039/c5tb00907c] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Microgels crosslinked with a cysteine derivative, which has ability to control gel degradation and trigger drug release.
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Affiliation(s)
| | | | - Jan Romanski
- Faculty of Chemistry
- University of Warsaw
- PL 02-093 Warsaw
- Poland
| | - Ewa Augustin
- Department of Pharmaceutical Technology and Biochemistry
- Gdansk University of Technology
- 80-233 Gdansk
- Poland
| | - Zbigniew Stojek
- Faculty of Chemistry
- University of Warsaw
- PL 02-093 Warsaw
- Poland
| | - Marcin Karbarz
- Faculty of Chemistry
- University of Warsaw
- PL 02-093 Warsaw
- Poland
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28
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He W, Wu M, Huang S, Yin L. Matrix tablets for sustained release of repaglinide: Preparation, pharmacokinetics and hypoglycemic activity in beagle dogs. Int J Pharm 2015; 478:297-307. [DOI: 10.1016/j.ijpharm.2014.11.059] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Revised: 11/14/2014] [Accepted: 11/26/2014] [Indexed: 10/24/2022]
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Controlling the swelling and rheological properties of hydrophobically modified polyacrylic acid nanoparticles: Role of pH, anionic surfactant and electrolyte. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.07.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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30
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Mackiewicz M, Romanski J, Karbarz M. New ampholytic microgels based on N-isopropylacrylamide and α-amino acid: changes in swelling behavior as a function of temperature, pH and divalent cation concentration. RSC Adv 2014. [DOI: 10.1039/c4ra08924c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Aleksovski A, Dreu R, Gašperlin M, Planinšek O. Mini-tablets: a contemporary system for oral drug delivery in targeted patient groups. Expert Opin Drug Deliv 2014; 12:65-84. [DOI: 10.1517/17425247.2014.951633] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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32
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Mackiewicz M, Rapecki T, Stojek Z, Karbarz M. Environmentally sensitive, quickly responding microgels with lattice channels filled with polyaniline. J Mater Chem B 2014; 2:1483-1489. [DOI: 10.1039/c3tb21578d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Dvořáčková K, Doležel P, Mašková E, Muselík J, Kejdušová M, Vetchý D. The effect of acid pH modifiers on the release characteristics of weakly basic drug from hydrophlilic-lipophilic matrices. AAPS PharmSciTech 2013; 14:1341-8. [PMID: 23990076 DOI: 10.1208/s12249-013-0019-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Accepted: 07/31/2013] [Indexed: 11/30/2022] Open
Abstract
The solubility of weakly basic drugs within passage though GI tract leads to pH-dependent or even incomplete release of these drugs from extended release formulations and consequently to lower drug absorption and bioavailability. The aim of the study was to prepare and evaluate hydrophilic-lipophilic (hypromellose-montanglycol wax) matrix tablets ensuring the pH-independent delivery of the weakly basic drug verapamil-hydrochloride by an incorporation of three organic acidifiers (citric, fumaric, and itaconic acids) differing in their concentrations, pK a, and solubility. The dissolution studies were performed by the method of changing pH values, which better corresponded to the real conditions in the GI tract (2 h at pH 1.2 and then 10 h at pH 6.8). Within the same conditions, pH of matrix microenvironment was measured. To determine relationships between the above mentioned properties of acidifiers and the monitored effects (the amount of released drug and surface pH of gel layer in selected time intervals-360 and 480 min), the full factorial design method and partial least squares PLS-2 regression were used. The incorporation of the tested pH modifiers significantly increased the drug release rate from matrices. PLS-components explained 75% and 73% variation in the X- and Y-data, respectively. The obtained results indicated that the main crucial points (p < 0.01) were the concentration and strength of acidifier incorporated into the matrix. Contrary, the acid solubility surprisingly did not influence the selected effects except for the surface pH of gel layer in time 480 min.
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Tuğcu-Demiröz F, Acartürk F, Erdoğan D. Development of long-acting bioadhesive vaginal gels of oxybutynin: Formulation, in vitro and in vivo evaluations. Int J Pharm 2013; 457:25-39. [DOI: 10.1016/j.ijpharm.2013.09.003] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Revised: 08/28/2013] [Accepted: 09/04/2013] [Indexed: 10/26/2022]
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Jiang C, Zhang C, Bai X, Liu B, Mu J. Synthesis, pH sensitivity, and drug-release behavior of acrylic acid and polyhedral oligomeric silsesquioxane copolymer. J Appl Polym Sci 2013. [DOI: 10.1002/app.39040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Bock DC, Takeuchi KJ, Marschilok AC, Takeuchi ES. Silver vanadium oxide and silver vanadium phosphorous oxide dissolution kinetics: a mechanistic study with possible impact on future ICD battery lifetimes. Dalton Trans 2013; 42:13981-9. [DOI: 10.1039/c3dt51544c] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Santos SD, Medronho B, Santos TD, Antunes FE. Amphiphilic Molecules in Drug Delivery Systems. DRUG DELIVERY SYSTEMS: ADVANCED TECHNOLOGIES POTENTIALLY APPLICABLE IN PERSONALISED TREATMENT 2013. [DOI: 10.1007/978-94-007-6010-3_2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Nicholson SJ, Timmins P, Dockens RC, Connor A, Croop R, Ferrie P, Zeng J, Dennis AB, Wilding I. Development of oral extended release formulations of 6-hydroxybuspirone. Biopharm Drug Dispos 2012; 33:522-35. [DOI: 10.1002/bdd.1819] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2012] [Revised: 09/28/2012] [Accepted: 10/09/2012] [Indexed: 11/11/2022]
Affiliation(s)
- Sarah J. Nicholson
- Drug Product Science and Technology, Research and Development; Bristol-Myers Squibb; Moreton; Merseyside; CH46 1QW; UK
| | - Peter Timmins
- Drug Product Science and Technology, Research and Development; Bristol-Myers Squibb; Moreton; Merseyside; CH46 1QW; UK
| | - Randy C. Dockens
- Discovery Medicine and Clinical Pharmacology, Research and Development; Bristol-Myers Squibb; Princeton; NJ; 08543; USA
| | - Alyson Connor
- Quotient Clinical; Ruddington; Nottingham; NG11 6JS; UK
| | - Robert Croop
- Global Clinical Research, Research and Development; Bristol-Myers Squibb; Princeton; NJ; 08543; USA
| | - Peter Ferrie
- Drug Product Science and Technology, Research and Development; Bristol-Myers Squibb; Moreton; Merseyside; CH46 1QW; UK
| | - Jianing Zeng
- Analytical and Bioanalytical Development, Research and Development; Bristol-Myers Squibb; Princeton; NJ; 08543; USA
| | - Andrew B. Dennis
- Drug Product Science and Technology, Research and Development; Bristol-Myers Squibb; Moreton; Merseyside; CH46 1QW; UK
| | - Ian Wilding
- Quotient Clinical; Ruddington; Nottingham; NG11 6JS; UK
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Antunes FE, Alves L, Duarte C, Lindman B, Klotz B, Böttcher A, Haake HM. Ionization by pH and Anionic Surfactant Binding Gives the Same Thickening Effects of Crosslinked Polyacrylic Acid Derivatives. J DISPER SCI TECHNOL 2012. [DOI: 10.1080/01932691.2011.605339] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Aktas E, Eroglu H, Kockan U, Oner L. Systematic development of pH-independent controlled release tablets of carvedilol using central composite design and artificial neural networks. Drug Dev Ind Pharm 2012; 39:1207-16. [DOI: 10.3109/03639045.2012.705291] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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41
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Varum FJ, Veiga F, Sousa JS, Basit AW. Mucoadhesive platforms for targeted delivery to the colon. Int J Pharm 2011; 420:11-9. [DOI: 10.1016/j.ijpharm.2011.08.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Revised: 08/03/2011] [Accepted: 08/04/2011] [Indexed: 10/17/2022]
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Eisenächer F, Schädlich A, Mäder K. Monitoring of internal pH gradients within multi-layer tablets by optical methods and EPR imaging. Int J Pharm 2011; 417:204-15. [DOI: 10.1016/j.ijpharm.2010.10.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2010] [Revised: 10/01/2010] [Accepted: 10/01/2010] [Indexed: 11/15/2022]
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Kotagale NR, Patel CJ, Parkhe AP, Khandelwal HM, Taksande JB, Umekar MJ. Carbopol 934-Sodium Alginate-Gelatin Mucoadhesive Ondansetron Tablets for Buccal Delivery: Effect of pH Modifiers. Indian J Pharm Sci 2011; 72:471-9. [PMID: 21218058 PMCID: PMC3013565 DOI: 10.4103/0250-474x.73912] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2010] [Revised: 07/09/2010] [Accepted: 07/28/2010] [Indexed: 11/25/2022] Open
Abstract
The present work aims at developing mucoahesive tablets of ondansetron hydrochloride using bioadhesive polymers like carbopol-934, sodium alginate and gelatin. Tablets prepared by direct compression using different polymer with varying ratio were evaluated for hardness, friability, uniformity of weight, disintegration time, microenvironmental pH, bioadhesion and in vitro release. Hardness, friability disintegration time and drug release were found within pharmacopoeial limit. Microenvironmental pH decreased whereas bioadhesive strength, water uptake, and in vitro release increased with increase in carbopol-934. Increasing sodium alginate and gelatin increased the microenviromental pH and decreased bioadhesive strength, water uptake and in vitro release. With a view to investigate the modulation of drug release from formulation by addition of pH modifiers viz. citric acid and sodium bicarbonate, the tablets with carbopol-934 (2.0), sodium alginate (0.5) and gelatin (6.5) were used and the effect of pH modifiers on microenvironmental pH, bioadhesion, water uptake, in vitro permeation and in vitro release was studied. Microenvironmental pH, bioadhesive strength, water uptake, in vitro release and permeation decreased with increasing concentration of citric acid whereas microenvironmental pH, water uptake and release were enhanced and bioadhesive strength was lowered with increase in sodium bicarbonate. Present study demonstrates carbopol-934, sodium alginate, gelatin polymer system with added pH modifier can be successfully formulated for buccal delivery of ondansetron with desired release profile.
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Affiliation(s)
- N R Kotagale
- Smt. Kishoritai Bhoyar College of Pharmacy, Behind Railway Station, New Kamptee, Dist. Nagpur, Maharashtra - 441 002, India
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Acciaro R, Gilányi T, Varga I. Preparation of monodisperse poly(N-isopropylacrylamide) microgel particles with homogenous cross-link density distribution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:7917-25. [PMID: 21591700 DOI: 10.1021/la2010387] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Monodisperse microgel latex with homogeneous cross-link density distribution within the particles was prepared by feeding the monomer and cross-linker into the reaction mixture in a regulated way during the polymerization. To determine the appropriate monomer feeding parameters, the kinetics of the particle formation was investigated by HPLC. The swelling and optical characteristics of the prepared homogenously cross-linked microgel particles were compared to the properties of inhomogenously cross-linked microgels prepared by the normal precipitation polymerization method. The distribution of the cross-link density within the particles inserts a great influence on the characteristics of the system. The degree of swelling of the homogeneous particles is significantly higher than that of the heterogeneous microgel particles. Furthermore, at room temperature the pNIPAm latex containing the homogeneously cross-linked particles is transparent, while the heterogeneously cross-linked particles form a highly turbid system at the same 0.1 wt% concentration.
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Affiliation(s)
- Roberta Acciaro
- Institute of Chemistry, Eötvös University, 1117 Budapest, Pázmány s. 1/A, Hungary
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Tran PHL, Choe JS, Tran TTD, Park YM, Lee BJ. Design and mechanism of on-off pulsed drug release using nonenteric polymeric systems via pH modulation. AAPS PharmSciTech 2011; 12:46-55. [PMID: 21161457 DOI: 10.1208/s12249-010-9562-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2010] [Accepted: 11/30/2010] [Indexed: 11/30/2022] Open
Abstract
The aim was to design a pH-sensitive pulsatile drug delivery system that allows for an on-off pulsed release of a drug using polyacrylic acid (PAA) blended with ethyl cellulose (EC) in different ratios. PAA, a polyelectrolyte polymer, exhibits a highly coiled conformation at low pH but a highly extended structure at high pH. Fumaric acid, which is an internal acidifying agent, was incorporated into the hydroxypropyl methylcellulose-based core tablets to create an acidic microenvironmental pH (pH(M)). The concentration of fumaric acid inside the core tablet and the ratio of PAA/EC in the coating layer were very crucial in modulating drug release behaviors. When the fumaric acid was retained in the core tablet, it gave a more acidic pH(M), so that the PAA was kept in a highly coiled state in the coated film, which hindered drug release ("off" release pattern). Interestingly, the release profiles of the drug and fumaric acid from coated tablets showed the on-off pulsed pattern upon dissolution. Imaging analyses using scanning electron microscopy, near-infrared imaging, confocal laser scanning microscopy, and Fourier transform infrared spectroscopy confirmed this on-off release behavior of the drug and fumaric acid from coated tablets.
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Matharu AS, Motto MG, Patel MR, Simonelli AP, Dave RH. Evaluation of hydroxypropyl methylcellulose matrix systems as swellable gastro-retentive drug delivery systems (GRDDS). J Pharm Sci 2010; 100:150-63. [PMID: 20572054 DOI: 10.1002/jps.22252] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2009] [Revised: 04/21/2010] [Accepted: 04/22/2010] [Indexed: 11/06/2022]
Abstract
Utilizing gastro-retentive drug delivery systems (GRDDS) to increase absorption of weakly basic drugs by extending their transit time is a promising approach. Swellable systems were evaluated for this purpose. Such systems demonstrate dual mechanism of release-diffusion and erosion. GRDDS requires maintaining its dimensions, which demands diffusion as a predominant mechanism of release (Fickian). In this work, dypyridamole, a weakly basic drug, together with various grades of hydroxypropyl methylcellulose and different excipients were evaluated for release and swelling properties. Dissolution data were analyzed by curve fitting to various models to estimate predominant release mechanism. It was found that matrices containing a swellable diluent like microcrystalline cellulose demonstrated predominantly Fickian mechanism of release, whereas soluble diluents (lactose and mannitol) contributed to a mixed mechanism of release. Addition of copovidone increased the swelling and survivability, whereas sodium chloride altered the erosion behavior. A correlation between matrix weight loss and drug release was obtained, which further consolidated the analysis. Correlation for the soluble excipients was linear, whereas that for the swellable excipient was nonlinear, implying predominance of Fickian release mechanism for the latter. Hence, the selection of excipients can influence matrix survivability and release kinetics, which can be used for developing GRDDS.
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Affiliation(s)
- Amol S Matharu
- Division of Pharmaceutical Sciences, Arnold & Marie Schwartz College of Pharmacy and Health Sciences, Long Island University, Brooklyn, New York 11201, USA
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Bassi P, Kaur G. pH modulation: a mechanism to obtain pH-independent drug release. Expert Opin Drug Deliv 2010; 7:845-57. [DOI: 10.1517/17425247.2010.491508] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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48
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Pygall SR, Kujawinski S, Timmins P, Melia CD. The suitability of tris(hydroxylmethyl) aminomethane (THAM) as a buffering system for hydroxypropyl methylcellulose (HPMC) hydrophilic matrices containing a weak acid drug. Int J Pharm 2010; 387:93-102. [DOI: 10.1016/j.ijpharm.2009.12.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2009] [Accepted: 12/04/2009] [Indexed: 11/17/2022]
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Tran TTD, Tran PHL, Choi HG, Han HK, Lee BJ. The roles of acidifiers in solid dispersions and physical mixtures. Int J Pharm 2010; 384:60-6. [DOI: 10.1016/j.ijpharm.2009.09.039] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2009] [Revised: 09/16/2009] [Accepted: 09/19/2009] [Indexed: 11/30/2022]
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Population in vitro-in vivo correlation model for pramipexole slow-release oral formulations. Pharm Res 2009; 27:340-9. [PMID: 20039105 DOI: 10.1007/s11095-009-0027-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2009] [Accepted: 12/03/2009] [Indexed: 10/20/2022]
Abstract
PURPOSE To establish an in vitro-in vivo level A correlation (IVIVC) for pramipexole slow-release formulations. METHODS The IVIVC was developed based on data from an immediate-release (IR) and three slow-release (SR) formulations of pramipexole; a fourth SR formulation was used for validation purposes. In vitro dissolution profiles were obtained from all SR formulations. Fifteen volunteers received all pramipexole formulations in a randomized cross-over trial. Data were analyzed using the population modelling approach as implemented in NONMEM VI. RESULTS Dissolution profiles of the SR formulations were described by the Weibull model. The pharmacokinetics of the IR formulation were described by a two-compartment disposition model with first-order absorption. Difference between the in vivo and in vitro estimates of the release rate constants (k(d)) from the Weibull function suggests the release process occurs faster in vivo. Pharmacokinetic profiles for SR formulations were described based on the in vitro release model with k(d) increased in 0.058 h(-1) and the population pharmacokinetic model developed from the IR formulation. CONCLUSION A level A IVIVC was established and evaluated for the pramipexole SR formulations, which can be used in the future as a surrogate to avoid certain bioequivalence studies.
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