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Bhattacharjee S, Pandit S, Seth D. Co-Solutes Induced Changes in the Properties of Polymeric Solution and Water Dynamics. Chemphyschem 2024; 25:e202400236. [PMID: 38517663 DOI: 10.1002/cphc.202400236] [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: 03/04/2024] [Revised: 03/21/2024] [Accepted: 03/22/2024] [Indexed: 03/24/2024]
Abstract
In this paper we are addressing the co-solute-induced changes in the properties of an aqueous solution of a block copolymer. Due to the preferential interaction of different co-solute with different regions of the block copolymer, the changes were observed in both the physical properties and water dynamics. The modulation of both the physical properties and water dynamics was monitored using different spectroscopic techniques. Different co-solutes affect micellar properties of copolymer to a different extent signifying their interactions with different regions within the copolymer. The solvent relaxation dynamics were also modulated with the additions of different co-solutes. The change in free-energy (ΔGbf) and rate constant for bound to free water interconversion (kbf) in a copolymeric micelle was calculated which gets affected by the addition of co-solutes. The calculated kbf suggests that betaine, sarcosine, TMAO, and GnHCl favor the ordering of water molecules around the micelle and are excluded from the micellar surface whereas, urea favors the formation of free-water molecules rather than the structurally ordered bound water molecules around the micelle by accumulating at the micellar surface. Among the added methylamines trimethylamine N-oxide affected the water dynamics and its kinetics most profoundly. The protective property of GnHCl was revealed.
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Affiliation(s)
- Sanyukta Bhattacharjee
- Department of Chemistry, Indian Institute of Technology Patna, Patna, 801103, Bihar, India
| | - Souvik Pandit
- Department of Chemistry, Indian Institute of Technology Patna, Patna, 801103, Bihar, India
| | - Debabrata Seth
- Department of Chemistry, Indian Institute of Technology Patna, Patna, 801103, Bihar, India
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Direct and Reverse Pluronic Micelles: Design and Characterization of Promising Drug Delivery Nanosystems. Pharmaceutics 2022; 14:pharmaceutics14122628. [PMID: 36559122 PMCID: PMC9787366 DOI: 10.3390/pharmaceutics14122628] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 11/19/2022] [Accepted: 11/22/2022] [Indexed: 11/29/2022] Open
Abstract
Pluronics are a family of amphiphilic block copolymers broadly explored in the pharmaceutical field. Under certain conditions, Pluronics self-assemble in different structures including nanosized direct and reverse micelles. This review provides an overview about the main parameters affecting the micellization process of Pluronics, such as polymer length, fragments distribution within the chain, solvents, additives and loading of cargo. Furthermore, it offers a guide about the most common techniques used to characterize the structure and properties of the micelles. Finally, it presents up-to-date approaches to improve the stability and drug loading of Pluronic micelles. Special attention is paid to reverse Pluronics and reverse micelles, currently underexplored in the literature. Pluronic micelles present a bright future as drug delivery agents. A smart design and thorough characterization will improve the transfer to clinical applications.
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Bhattacharjee S, Pandit S, Seth D. How Kosmotropic and Chaotropic Osmolytes Perturb the Properties of an Aqueous Solution of a Pluronic Block Copolymer? LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:9347-9362. [PMID: 35868256 DOI: 10.1021/acs.langmuir.2c01207] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Poloxamer 407 (P-407) composed of a poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) (PEG-PPG-PEG) unit has two distinct microenvironments: the interior core formed by the PPG unit and the exterior shell formed by the PEG unit. In this work, we have used two fluorescent molecules coumarin-153 and 8-anilino-1-naphthalene sulfonic acid (ANS) of contrasting natures to characterize and probe the water dynamics in the core and corona regions of the copolymer by means of spectroscopic techniques, namely, absorption, fluorescence, and time-resolved fluorescence emission spectroscopy and Fourier transform infrared (FTIR) spectroscopy. Changes in the surface morphologies were characterized by using microscopic techniques. Further, two classes of osmolytes kosmotropic (betaine and sarcosine) and chaotropic (urea) known to perturb the water structure were added to aqueous solutions of P-407. Our studies reveal that the addition of kosmotropes decreases the critical micelle temperature (CMT) of the copolymer, whereas the chaotropic osmolyte increases the CMT. Steady-state studies reveal that the addition of the osmolytes to the copolymer increases the polarity of the micelle formed and hence results in the red shift in the ANS absorbance maximum. FTIR spectroscopy reveals that kosmotropes interact with the PEG moiety of the copolymer, whereas the chaotrope interacts with both the PEG and PPG moieties of the copolymer. Solvent relaxation studies produced less changes upon the addition of the kosmotropes, whereas a greater change in the relaxation time was observed in the presence of the chaotrope.
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Affiliation(s)
- Sanyukta Bhattacharjee
- Department of Chemistry, Indian Institute of Technology Patna, Patna, Bihar 801103, India
| | - Souvik Pandit
- Department of Chemistry, Indian Institute of Technology Patna, Patna, Bihar 801103, India
| | - Debabrata Seth
- Department of Chemistry, Indian Institute of Technology Patna, Patna, Bihar 801103, India
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Pittol V, Veras KS, Kaiser S, Danielli LJ, Fuentefria AM, Ortega GG. Poloxamer-enhanced solubility of griseofulvin and its related antifungal activity against Trichophyton spp. BRAZ J PHARM SCI 2022. [DOI: 10.1590/s2175-97902022e19731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Veeravalli V, Cheruvu HS, Srivastava P, Vamsi Madgula LM. Three-dimensional aspects of formulation excipients in drug discovery: a critical assessment on orphan excipients, matrix effects and drug interactions. J Pharm Anal 2020; 10:522-531. [PMID: 33425449 PMCID: PMC7775846 DOI: 10.1016/j.jpha.2020.02.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Revised: 02/02/2020] [Accepted: 02/17/2020] [Indexed: 11/22/2022] Open
Abstract
Formulation/pharmaceutical excipients play a major role in formulating drug candidates, with the objectives of ease of administration, targeted delivery and complete availability. Many excipients used in pharmaceutical formulations are orphanized in preclinical drug discovery. These orphan excipients could enhance formulatability of highly lipophilic compounds. Additionally, they are safe in preclinical species when used below the LD50 values. However, when the excipients are used in formulating compounds with diverse physico-chemical properties, they pose challenges by modulating study results through their bioanalytical matrix effects. Excipients invariably present in study samples and not in the calibration curve standards cause over-/under- estimation of exposures. Thus, the mechanism by which excipients cause matrix effects and strategies to nullify these effects needs to be revisited. Furthermore, formulation excipients cause drug interactions by moderating the pathways of drug metabolizing enzymes and drug transport proteins. Although it is not possible to get rid of excipient driven interactions, it is always advised to be aware of these interactions and apply the knowledge to draw meaningful conclusions from study results. In this review, we will comprehensively discuss a) orphan excipients that have wider applications in preclinical formulations, b) bioanalytical matrix effects and possible approaches to mitigating these effects, and c) excipient driven drug interactions and strategies to alleviate the impacts of drug interactions.
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Affiliation(s)
- Vijayabhaskar Veeravalli
- Syngene International Limited, Biocon Park, SEZ, Bommasandra Industrial Area - Phase-IV Bommasandra-Jigani Link Road, Bangalore, 560099, India
| | - Hanumanth Srikanth Cheruvu
- Syngene International Limited, Biocon Park, SEZ, Bommasandra Industrial Area - Phase-IV Bommasandra-Jigani Link Road, Bangalore, 560099, India
| | | | - Lakshmi Mohan Vamsi Madgula
- Syngene International Limited, Biocon Park, SEZ, Bommasandra Industrial Area - Phase-IV Bommasandra-Jigani Link Road, Bangalore, 560099, India
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Thompson SW, Guimarães TR, Zetterlund PB. RAFT Emulsion Polymerization: MacroRAFT Agent Self-Assembly Investigated Using a Solvachromatic Dye. Biomacromolecules 2020; 21:4577-4590. [DOI: 10.1021/acs.biomac.0c00685] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Steven W. Thompson
- Centre for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Thiago R. Guimarães
- Centre for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Per B. Zetterlund
- Centre for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia
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Rikiyama K, Sanada Y, Watanabe K, Aida M, Katsumoto Y. Unimer Structure and Micellization of Poly(ethylene oxide)-Stereocontrolled Poly( N-isopropylacrylamide) Alternating Multiblock Copolymers in Aqueous Solution. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01172] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Kazuaki Rikiyama
- Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-hiroshima 739-8526, Japan
| | - Yusuke Sanada
- Department of Chemistry, Faculty of Science, Fukuoka University, Nanakuma 8-19-1, Jonan-ku, Fukuoka 814-0180, Japan
| | - Keisuke Watanabe
- Department of Chemistry, Faculty of Science, Fukuoka University, Nanakuma 8-19-1, Jonan-ku, Fukuoka 814-0180, Japan
| | - Misako Aida
- Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-hiroshima 739-8526, Japan
| | - Yukiteru Katsumoto
- Department of Chemistry, Faculty of Science, Fukuoka University, Nanakuma 8-19-1, Jonan-ku, Fukuoka 814-0180, Japan
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Rikiyama K, Horiuchi T, Koga N, Sanada Y, Watanabe K, Aida M, Katsumoto Y. Micellization of poly(ethylene oxide)-poly(propylene oxide) alternating multiblock copolymers in water. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.09.047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Szafraniec J, Antosik A, Knapik-Kowalczuk J, Chmiel K, Kurek M, Gawlak K, Paluch M, Jachowicz R. Enhanced dissolution of solid dispersions containing bicalutamide subjected to mechanical stress. Int J Pharm 2018; 542:18-26. [PMID: 29481948 DOI: 10.1016/j.ijpharm.2018.02.040] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Revised: 02/21/2018] [Accepted: 02/22/2018] [Indexed: 11/16/2022]
Abstract
The anticancer drug bicalutamide was co-milled with either Macrogol 6000 or Poloxamer 407, and the physicochemical parameters that drive the phase transition of binary systems and influence the dissolution modification of bicalutamide were studied. Milled binary systems with reduced particle size were assessed by scanning electron microscopy and laser diffraction measurements. The results of thermal analysis supported by X-ray diffractometry confirmed the reduction of the crystallinity of bicalutamide co-milled with Macrogol 6000. Infrared spectroscopy was used to determine the molecular structure of the samples and indicated weak interactions between drug and polymer molecules. Two mechanisms were identified and were involved in up to 11-fold enhanced dissolution. The first one was based on improved wettability due to a decreased contact angle in samples containing Macrogol 6000. The second one relied on the solubilization of bicalutamide within nanoaggregates formed by Poloxamer 407 that resulted from its surface activity. This finding was confirmed with fluorescence spectroscopy, dynamic light scattering and cryogenic transmission electron microscopy assays. Given the dissolution rate-limited absorption combined with the reduced bioavailability of bicalutamide as a BCS class II drug, the assessment of the mechanisms driving the increase in drug dissolution is of particular importance in drug development.
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Affiliation(s)
- Joanna Szafraniec
- Department of Pharmaceutical Technology and Biopharmaceutics, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland; Department of Physical Chemistry and Electrochemistry, Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland.
| | - Agata Antosik
- Department of Pharmaceutical Technology and Biopharmaceutics, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland
| | - Justyna Knapik-Kowalczuk
- Division of Biophysics and Molecular Physics, Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland; Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - Krzysztof Chmiel
- Division of Biophysics and Molecular Physics, Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland; Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - Mateusz Kurek
- Department of Pharmaceutical Technology and Biopharmaceutics, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland
| | - Karolina Gawlak
- Department of Physical Chemistry and Electrochemistry, Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Marian Paluch
- Division of Biophysics and Molecular Physics, Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland; Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1a, 41-500 Chorzow, Poland
| | - Renata Jachowicz
- Department of Pharmaceutical Technology and Biopharmaceutics, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland
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Sharma D, Singh J. Synthesis and Characterization of Fatty Acid Grafted Chitosan Polymer and Their Nanomicelles for Nonviral Gene Delivery Applications. Bioconjug Chem 2017; 28:2772-2783. [PMID: 29040803 DOI: 10.1021/acs.bioconjchem.7b00505] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The aim of this study was to synthesize and characterize fatty acid-grafted-chitosan (fatty acid-g-CS) polymer and their nanomicelles for use as carriers for gene delivery. CS was hydrophobically modified using saturated fatty acids of increasing fatty acyl chain length. Carbodiimide along with N-hydroxysuccinimide was used for coupling carboxyl group of fatty acids with amine groups of CS. Proton nuclear magnetic resonance and Fourier transform infrared spectroscopy were used to quantify fatty acyl substitution onto CS backbone. The molecular weight distribution of the synthesized polymers was determined using size exclusion high performance liquid chromatography and was found to be in range of the parent CS polymer (∼50 kDa). The critical micelle concentration (cmc) of the polymers was determined using pyrene as a fluorescent probe. The cmc was found to decrease with an increase in fatty acyl chain length. The amphiphilic fatty acid-g-CS polymers self-assembled in an aqueous environment to form nanomicelles of ∼200 nm particle size and slightly positive net charge due to the cationic nature of free primary amino groups on CS molecule. These polymeric nanomicelles exhibited excellent hemo- and cytocompatibility, as evaluated by in vitro hemolysis and MTT cell viability assay, respectively, and showed superior transfection efficiency compared to unmodified chitosan and naked DNA. The surface of these nanomicelles can be further modified with ligands allowing for selective targeting, enhanced cell binding, and internalization. These nanomicelles can thus be exploited as potential nonviral gene delivery vectors for safe and efficient gene therapy.
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Affiliation(s)
- Divya Sharma
- Department of Pharmaceutical Sciences, School of Pharmacy, College of Health Professions, North Dakota State University , Fargo, North Dakota 58105, United States
| | - Jagdish Singh
- Department of Pharmaceutical Sciences, School of Pharmacy, College of Health Professions, North Dakota State University , Fargo, North Dakota 58105, United States
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Aydin F, Chu X, Uppaladadium G, Devore D, Goyal R, Murthy NS, Zhang Z, Kohn J, Dutt M. Self-Assembly and Critical Aggregation Concentration Measurements of ABA Triblock Copolymers with Varying B Block Types: Model Development, Prediction, and Validation. J Phys Chem B 2016; 120:3666-76. [PMID: 27031284 DOI: 10.1021/acs.jpcb.5b12594] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The dissipative particle dynamics (DPD) simulation technique is a coarse-grained (CG) molecular dynamics-based approach that can effectively capture the hydrodynamics of complex systems while retaining essential information about the structural properties of the molecular species. An advantageous feature of DPD is that it utilizes soft repulsive interactions between the beads, which are CG representation of groups of atoms or molecules. In this study, we used the DPD simulation technique to study the aggregation characteristics of ABA triblock copolymers in aqueous medium. Pluronic polymers (PEG-PPO-PEG) were modeled as two segments of hydrophilic beads and one segment of hydrophobic beads. Tyrosine-derived PEG5K-b-oligo(desaminotyrosyl tyrosine octyl ester-suberate)-b-PEG5K (PEG5K-oligo(DTO-SA)-PEG5K) block copolymers possess alternate rigid and flexible components along the hydrophobic oligo(DTO-SA) chain, and were modeled as two segments of hydrophilic beads and one segment of hydrophobic, alternate soft and hard beads. The formation, structure, and morphology of the initial aggregation of the polymer molecules in aqueous medium were investigated by following the aggregation dynamics. The dimensions of the aggregates predicted by the computational approach were in good agreement with corresponding results from experiments, for the Pluronic and PEG5K-oligo(DTO-SA)-PEG5K block copolymers. In addition, DPD simulations were utilized to determine the critical aggregation concentration (CAC), which was compared with corresponding results from an experimental approach. For Pluronic polymers F68, F88, F108, and F127, the computational results agreed well with experimental measurements of the CAC measurements. For PEG5K-b-oligo(DTO-SA)-b-PEG5K block polymers, the complexity in polymer structure made it difficult to directly determine their CAC values via the CG scheme. Therefore, we determined CAC values of a series of triblock copolymers with 3-8 DTO-SA units using DPD simulations, and used these results to predict the CAC values of triblock copolymers with higher molecular weights by extrapolation. In parallel, a PEG5K-b-oligo(DTO-SA)-b-PEG5K block copolymer was synthesized, and the CAC value was determined experimentally using the pyrene method. The experimental CAC value agreed well with the CAC value predicted by simulation. These results validate our CG models, and demonstrate an avenue to simulate and predict aggregation characteristics of ABA amphiphilic triblock copolymers with complex structures.
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Affiliation(s)
- Fikret Aydin
- Department of Chemical Engineering and ‡New Jersey Center for Biomaterials, Rutgers, The State University of New Jersey , Piscataway 08854, New Jersey, United States
| | - Xiaolei Chu
- Department of Chemical Engineering and ‡New Jersey Center for Biomaterials, Rutgers, The State University of New Jersey , Piscataway 08854, New Jersey, United States
| | - Geetartha Uppaladadium
- Department of Chemical Engineering and ‡New Jersey Center for Biomaterials, Rutgers, The State University of New Jersey , Piscataway 08854, New Jersey, United States
| | - David Devore
- Department of Chemical Engineering and ‡New Jersey Center for Biomaterials, Rutgers, The State University of New Jersey , Piscataway 08854, New Jersey, United States
| | - Ritu Goyal
- Department of Chemical Engineering and ‡New Jersey Center for Biomaterials, Rutgers, The State University of New Jersey , Piscataway 08854, New Jersey, United States
| | - N Sanjeeva Murthy
- Department of Chemical Engineering and ‡New Jersey Center for Biomaterials, Rutgers, The State University of New Jersey , Piscataway 08854, New Jersey, United States
| | - Zheng Zhang
- Department of Chemical Engineering and ‡New Jersey Center for Biomaterials, Rutgers, The State University of New Jersey , Piscataway 08854, New Jersey, United States
| | - Joachim Kohn
- Department of Chemical Engineering and ‡New Jersey Center for Biomaterials, Rutgers, The State University of New Jersey , Piscataway 08854, New Jersey, United States
| | - Meenakshi Dutt
- Department of Chemical Engineering and ‡New Jersey Center for Biomaterials, Rutgers, The State University of New Jersey , Piscataway 08854, New Jersey, United States
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Soliman GM, Redon R, Sharma A, Mejía D, Maysinger D, Kakkar A. Miktoarm Star Polymer Based Multifunctional Traceable Nanocarriers for Efficient Delivery of Poorly Water Soluble Pharmacological Agents. Macromol Biosci 2014; 14:1312-24. [DOI: 10.1002/mabi.201400123] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Revised: 04/16/2014] [Indexed: 12/21/2022]
Affiliation(s)
- Ghareb M. Soliman
- Department of Chemistry; McGill University; 801 Sherbrooke St. West Montreal Quebec, Canada H3A 0B8
- Department of Pharmacology and Therapeutics; McGill University; 3655 Promenade Sir-William-Osler Montreal Quebec, Canada H3G 1Y6
- Department of Pharmaceutics, Faculty of Pharmacy; Assiut University; 71526 Assiut Egypt
| | - Rocio Redon
- Department of Chemistry; McGill University; 801 Sherbrooke St. West Montreal Quebec, Canada H3A 0B8
- Centro de Ciencias Aplicadas y Desarrollo Tecnológico; Universidad Nacional Autónoma de México; Cd. Universitaria A.P. 70-186, C.P. 04510 Coyoacan México D. F., México
| | - Anjali Sharma
- Department of Chemistry; McGill University; 801 Sherbrooke St. West Montreal Quebec, Canada H3A 0B8
| | - Diana Mejía
- Department of Pharmacology and Therapeutics; McGill University; 3655 Promenade Sir-William-Osler Montreal Quebec, Canada H3G 1Y6
| | - Dusica Maysinger
- Department of Pharmacology and Therapeutics; McGill University; 3655 Promenade Sir-William-Osler Montreal Quebec, Canada H3G 1Y6
| | - Ashok Kakkar
- Department of Chemistry; McGill University; 801 Sherbrooke St. West Montreal Quebec, Canada H3A 0B8
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Cambón A, Barbosa S, Rey-Rico A, Figueroa-Ochoa EB, Soltero JF, Yeates SG, Alvarez-Lorenzo C, Concheiro A, Taboada P, Mosquera V. Poly(ethylene oxide)–poly(styrene oxide)–poly(ethylene oxide) copolymers: Micellization, drug solubilization, and gelling features. J Colloid Interface Sci 2012; 387:275-84. [DOI: 10.1016/j.jcis.2012.06.090] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Revised: 06/26/2012] [Accepted: 06/27/2012] [Indexed: 11/27/2022]
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Filip D, Macocinschi D, Vlad S. Micellar behavior of some amphiphilic block polyurethanes in aqueous/nonaqueous media. Eur Polym J 2012. [DOI: 10.1016/j.eurpolymj.2011.12.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Cambón A, Alatorre-Meda M, Juárez J, Topete A, Mistry D, Attwood D, Barbosa S, Taboada P, Mosquera V. Micellisation of triblock copolymers of ethylene oxide and 1,2-butylene oxide: Effect of B-block length. J Colloid Interface Sci 2011; 361:154-8. [DOI: 10.1016/j.jcis.2011.05.059] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2011] [Revised: 05/16/2011] [Accepted: 05/17/2011] [Indexed: 01/04/2023]
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Wiggan O, Livengood JA, Silengo SJ, Kinney RM, Osorio JE, Huang CYH, Stinchcomb DT. Novel formulations enhance the thermal stability of live-attenuated flavivirus vaccines. Vaccine 2011; 29:7456-62. [PMID: 21803103 DOI: 10.1016/j.vaccine.2011.07.054] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2011] [Revised: 06/29/2011] [Accepted: 07/17/2011] [Indexed: 11/16/2022]
Abstract
Thermal stability is important for the manufacture, distribution and administration of vaccines, especially in tropical developing countries, where particularly adverse field conditions exist. Current live-attenuated flavivirus vaccines exhibit relatively poor liquid stability in clinical settings, and clinicians are instructed to discard the yellow fever vaccine 1h after reconstitution. We have identified novel combinations of excipients that greatly enhance the thermal stability of live-attenuated DEN-2 PDK-53-based flavivirus vaccine candidates. Liquid formulations comprising a sugar, albumin and a pluronic polymer minimized the loss of flavivirus infectious titer to less than 0.5 log(10)pfu after storage for at least 8h at 37°C, 7 days at room temperature or at least 11 weeks at 4°C. Additionally, these formulations prevented reduction of viral infectivity after two freeze-thaw cycles of virus. Formulated candidate vaccines were readily lyophilized and reconstituted with minimal loss of viral titers. In mice, the formulations were safe and did not hinder the ability of the vaccine virus to generate a potent, protective immune response. These formulations provided significantly greater liquid-phase stability than has been reported previously for other flavivirus vaccine formulations. The enhanced thermal stability provided by the formulations described here will facilitate the effective distribution of flavivirus vaccines worldwide.
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Affiliation(s)
- O'Neil Wiggan
- Inviragen Inc., Fort Collins, Colorado 80525,United States
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Uchiyama H, Tozuka Y, Asamoto F, Takeuchi H. Fluorescence investigation of a specific structure formed by aggregation of transglycosylated stevias: Solubilizing effect of poorly water-soluble drugs. Eur J Pharm Sci 2011; 43:71-7. [DOI: 10.1016/j.ejps.2011.03.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2011] [Revised: 03/18/2011] [Accepted: 03/26/2011] [Indexed: 11/15/2022]
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18
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Aliaga C, Briones L, Rezende MC, Tirapegui C. The thermochromism of the ET(30) betaine in a micro-heterogeneous medium: A spectral and dynamics simulation study. J Colloid Interface Sci 2010; 349:565-70. [DOI: 10.1016/j.jcis.2010.05.088] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2010] [Revised: 05/25/2010] [Accepted: 05/27/2010] [Indexed: 10/19/2022]
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19
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Kim IS, Oh IJ. Preparation and characterization of stearic acid-pullulan nanoparticles. Arch Pharm Res 2010; 33:761-7. [PMID: 20512475 DOI: 10.1007/s12272-010-0516-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2009] [Revised: 03/08/2010] [Accepted: 03/08/2010] [Indexed: 11/28/2022]
Abstract
For a new anticancer drug carrier, we synthesized 4 compositions of amphiphilic stearic acidconjugated pullulan (SAP) and characterized them with FT-IR spectroscopy. Crystalline changes were verified by x-ray diffraction patterns before and after synthesis of the SAP conjugate. SAP nanoparticles were prepared by a diafiltration method, and the fluorescence spectroscopy using pyrene showed particle self-assembly in water. SAP nanoparticles were spherical in TEM photos, and particle size ranged between 200 approximately 500 nm in photon correlation spectroscopy. Release of all-trans-retinoic acid from the SAP nanoparticles was maintained over 5 weeks. For further study in vivo, we tested the cytotoxicity of SAP nanoparticles using an MTT assay, and cytotoxicity was augmented as the molar mass of stearic acid increased in human liver carcinoma HepG2 cells. Therefore, SAP nanoparticles might be a promising longterm delivery carrier for hydrophobic therapeutic molecules with the appropriate composition.
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Affiliation(s)
- In-Sook Kim
- Research Institute of Drug Development, Chonnam National University, Gwangju, Korea
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Hawe A, Filipe V, Jiskoot W. Fluorescent molecular rotors as dyes to characterize polysorbate-containing IgG formulations. Pharm Res 2009; 27:314-26. [PMID: 20041280 PMCID: PMC2812426 DOI: 10.1007/s11095-009-0020-2] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2009] [Accepted: 11/24/2009] [Indexed: 11/26/2022]
Abstract
PURPOSE The aim was to evaluate fluorescent molecular rotors (DCVJ and CCVJ), which are mainly sensitive to viscosity, for the characterization of polysorbate-containing IgG formulations and compare them to the polarity-sensitive dyes ANS, Bis-ANS and Nile Red. METHODS IgG formulations with polysorbate 20 or 80 were stressed below the aggregation temperature and analyzed by steady-state and time-resolved fluorescence and by HP-SEC with UV and fluorescent dye detection (Bis-ANS and CCVJ). Furthermore, commercial protein preparations of therapeutic proteins (Enbrel 50 mg, Humira 40 mg and MabThera 100 mg) were aggregated accordingly and analyzed with CCVJ fluorescence and HP-SEC. RESULTS Contrarily to (Bis-)ANS and Nile Red, the molecular rotors DCVJ and CCVJ showed low background fluorescence in polysorbate-containing buffers. Time-resolved fluorescence experiments confirmed the steady-state fluorescence data. Both DCVJ and CCVJ showed enhanced fluorescence intensity for aggregated IgG formulations and were suitable for the characterization of polysorbate-containing IgG formulations in steady-state fluorescence and HP-SEC with dye detection (CCVJ). CCVJ was capable of detecting thermally induced aggregation in the commercial polysorbate-containing products Enbrel 50 mg, Humira 40 mg and MabThera 100 mg. CONCLUSION Fluorescent molecular rotors are suitable probes to detect aggregation in polysorbate-containing IgG formulations.
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Affiliation(s)
- Andrea Hawe
- Division of Drug Delivery Technology, Leiden/Amsterdam Center for Drug Research, Leiden University, P.O. Box 9502, 2300 RA, Leiden, The Netherlands.
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