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de Dios-Pérez I, González-Garcinuño Á, Tabernero A, Blanco-López M, García-Esteban JA, Moreno-Rodilla V, Curto B, Pérez-Esteban P, Martín Del Valle EM. Development of a thermosensitive hydrogel based on Polaxamer 407 and gellan gum with inclusion complexes (Sulfobutylated-β-cyclodextrin-Farnesol) as a local drug delivery system. Eur J Pharm Sci 2023; 191:106618. [PMID: 37866674 DOI: 10.1016/j.ejps.2023.106618] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Revised: 09/12/2023] [Accepted: 10/17/2023] [Indexed: 10/24/2023]
Abstract
This work proposes the development of a thermosensitive local drug release system based on Polaxamer 407, also known as Pluronic® F-127 (PF-127), Gellan Gum (GG) and the inclusion complex Sulfobutylated-β-cyclodextrin (CD) with Farnesol (FOH). Rheological properties of the hydrogels and their degradation were studied. According to the rheological results, a solution of 20% w/v of PF-127 forms a strong gel with a gelling temperature of about 25 °C (storage modulus of 15,000 Pa). The addition of the GG increased the storage modulus (optimal concentration of 0.5 % w/v) twofold without modifying the gelling temperature. Moreover, including 0.5% w/v of GG also increased 6 times the degradation time of the hydrogel. Regarding the inclusion complex, the addition of free CD decreased the viscosity and the gel strength since polymer chains were included in CD cavity without affecting the gelling temperature. Contrarily, the inclusion complex CD-FOH did not significantly modify any property of the formulation because the FOH was hosted in the CD. Furthermore, a mathematical model was developed to adjust the degradation time. This model highlights that the addition of the GG decreases the number of released chains from the polymeric network (which coincides with an increase in the storage modulus) and that the free CD reduces the degradation rate, protecting the polymeric chains. Finally, FOH release was quantified with a specific device, that was designed and printed for this type of system, observing a sustainable drug release (similar to FOH aqueous solubility, 8 μM) dependent on polymer degradation.
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Affiliation(s)
| | - Álvaro González-Garcinuño
- Department of Chemical Engineering, University of Salamanca, Spain; Institute for Biomedical Research of Salamanca (IBSAL), Spain
| | - Antonio Tabernero
- Department of Chemical Engineering, University of Salamanca, Spain; Institute for Biomedical Research of Salamanca (IBSAL), Spain
| | | | | | | | - Belén Curto
- Department of Computer Science and Automation, University of Salamanca, Spain
| | - Patricia Pérez-Esteban
- Institute of Translational Medicine, Heritage Building, Mindelsohn Way, Birmingham, B15 2TH, England
| | - Eva M Martín Del Valle
- Department of Chemical Engineering, University of Salamanca, Spain; Institute for Biomedical Research of Salamanca (IBSAL), Spain.
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2
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Gu T, Huang J, Yan Y. New opportunities for cyclodextrins in supramolecular assembly: metal organic frameworks, crystalline self-assembly, and catalyzed assembly. Chem Commun (Camb) 2023. [PMID: 37997750 DOI: 10.1039/d3cc04048h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2023]
Abstract
Cyclodextrins (CDs) are widely used macrocycles in supramolecular assembly due to their easy availability, versatile functionality and excellent biocompatibility. Although they are well-known for forming host-guest complexes with a wide range of guests and this host-guest chemistry has long been utilized in industry and academia, new opportunities have arisen in recent years, particularly in supramolecular assembly. In the present review, we will first provide a basic introduction to CDs and then summarize their emerging roles in the fields of supramolecular chemistry and materials. This includes their involvement in hybrid frameworks with inorganic components such as metal ions and polyoxometalates, crystalline self-assembly with amphiphilic molecules, and their new possibility of "catassembly" and induced chiral supramolecular structures that have previously been overlooked. Finally, we will comment on the future perspectives of CDs to inspire more ideas and efforts, with the aim of promoting diverse applications of CDs in supramolecular materials.
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Affiliation(s)
- Ting Gu
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
| | - Jianbin Huang
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
| | - Yun Yan
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
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3
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Mixed micelles and gels of a hydrophilic poloxamine (Tetronic 1307) and miltefosine: Structural characterization by small-angle neutron scattering and in vitro evaluation for the treatment of leishmaniasis. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
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4
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Dos Santos Silva Araújo L, Watson L, Traore DAK, Lazzara G, Chiappisi L. Hierarchical assembly of pH-responsive surfactant-cyclodextrin complexes. SOFT MATTER 2022; 18:6529-6537. [PMID: 35894255 DOI: 10.1039/d2sm00807f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In this work, the inclusion complexes of alkyl ethoxy carboxylates with α-cyclodextrin (αCD) and β-cyclodextrin (βCD) were investigated. The thermodynamics of the complexation process was probed by isothermal titration calorimetry (ITC) and volumetry as a function of the degree of ionization of the surfactant. The complexation process was shown to be an enthalpically driven pH-independent process. For both types of cyclodextrins, the complexes were found to spontaneously self-assemble into highly-ordered supramolecular aggregates probed by small-angle neutron scattering and electron and optical microscopy. Herein, we report the formation of thin platelets for nonionized surfactant systems and equally spaced multilayered hollow cylinders for ionized systems in a hierarchical self-assembly process. In addition, the analysis allowed unveiling the effect of the number of ethylene oxides in the surfactants and the CD cavity size on the morphology of the aggregates. Finally, this study also highlights the importance of examining the tuning parameters' influence on the short and long-range interactions involved in the control of the assembly process.
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Affiliation(s)
- Larissa Dos Santos Silva Araújo
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze pad 17, 90128, Palermo, Italy
- Institut Max von Laue - Paul Langevin, 71 Avenue des Martyrs, 38042, Grenoble, France.
| | - Leah Watson
- Institut Max von Laue - Paul Langevin, 71 Avenue des Martyrs, 38042, Grenoble, France.
| | - Daouda A K Traore
- Institut Max von Laue - Paul Langevin, 71 Avenue des Martyrs, 38042, Grenoble, France.
- School of Life Sciences, Keele University, Staffordshire ST5 5BG, UK
| | - Giuseppe Lazzara
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze pad 17, 90128, Palermo, Italy
| | - Leonardo Chiappisi
- Institut Max von Laue - Paul Langevin, 71 Avenue des Martyrs, 38042, Grenoble, France.
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5
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Fang G, Wang Q, Yang X, Qian Y, Zhang G, Tang B. γ-Cyclodextrin-based polypseudorotaxane hydrogels for ophthalmic delivery of flurbiprofen to treat anterior uveitis. Carbohydr Polym 2022; 277:118889. [PMID: 34893291 DOI: 10.1016/j.carbpol.2021.118889] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 11/04/2021] [Accepted: 11/10/2021] [Indexed: 12/20/2022]
Abstract
Anterior uveitis is a sight-threatening inflammation inside the eyes. Conventional eye drops for anti-inflammatory therapy need to be administered frequently owing to the rapid elimination and corneal barrier. To address these issues, polypseudorotaxane hydrogels were developed by mixing Soluplus micelles (99.4 nm) and cyclodextrins solution. The optimized hydrogels exhibited shear-thinning and sustained release properties. The hydrogels exhibited higher transcorneal permeability coefficient (Papp, 1.84 folds) than that of drug solutions. Moreover, animal study indicated that the hydrogels significantly increased the precorneal retention (AUC, 21.2 folds) and intraocular bioavailability of flurbiprofen (AUCAqueous humor, 17.8 folds) in comparison with drug solutions. Importantly, the hydrogels obviously boosted anti-inflammatory efficacy in rabbit model of endotoxin-induced uveitis at a reduced administration frequency. Additionally, the safety of hydrogels was confirmed by cytotoxicity and ocular irritation studies. In all, the present study demonstrates a friendly non-invasive strategy based on γ-CD-based polypseudorotaxane hydrogels for ocular drug delivery.
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Affiliation(s)
- Guihua Fang
- School of Pharmacy, Jiangsu Key Laboratory of Inflammation and Molecular Drug Targets, Nantong University, Nantong, Jiangsu Province 226001, China
| | - Qiuxiang Wang
- School of Pharmacy, Jiangsu Key Laboratory of Inflammation and Molecular Drug Targets, Nantong University, Nantong, Jiangsu Province 226001, China
| | - Xuewen Yang
- School of Pharmacy, Jiangsu Key Laboratory of Inflammation and Molecular Drug Targets, Nantong University, Nantong, Jiangsu Province 226001, China
| | - Yu Qian
- School of Pharmacy, Jiangsu Key Laboratory of Inflammation and Molecular Drug Targets, Nantong University, Nantong, Jiangsu Province 226001, China
| | - Guowei Zhang
- Eye Institute, Affiliated Hospital of Nantong University, Nantong, Jiangsu Province 226001, China
| | - Bo Tang
- School of Pharmacy, Jiangsu Key Laboratory of Inflammation and Molecular Drug Targets, Nantong University, Nantong, Jiangsu Province 226001, China.
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6
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Shih KC, Su CY, Chang SY, Jensen G, Hua CC, Nieh MP, Lai HM. Correlation of the hierarchical structure with rheological behavior of polypseudorotaxane gel composed of pluronic and β-cyclodextrin. SOFT MATTER 2020; 16:4990-4998. [PMID: 32436559 DOI: 10.1039/d0sm00406e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We have identified the hierarchical (primary, secondary, tertiary and quaternary) structures of a polypseudorotaxane (PPR) gel composed of the Pluronic F108 and β-cyclodextrin system to be β-cyclodextrin crystalline, lamellar sheets, lamellar stacks and "grains", respectively. The correlation between the rheological properties and the proposed structures under shear flows was rationalized. Alignment of lamellar stacks and reorganization of grain boundaries under shear flows were investigated by rheo-SANS, small angle X-ray scattering and small-angle light scattering. The relaxation of highly aligned lamellar stacks is slow (>2 h) after flow cessation compared to that of the regrouped grains (a few minutes). The main contribution to thixotropic behavior is likely from the faster relaxation of the reorganized grains containing highly oriented lamellar stacks. The comprehensive understanding of structure-function relationship of the PPR gel will facilitate the rational design for its applications.
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Affiliation(s)
- Kuo-Chih Shih
- Department of Agricultural Chemistry, National Taiwan University, Taipei, 10617, Taiwan.
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7
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Kundu P, Das S, Chattopadhyay N. Managing efficacy and toxicity of drugs: Targeted delivery and excretion. Int J Pharm 2019; 565:378-390. [DOI: 10.1016/j.ijpharm.2019.04.058] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 04/17/2019] [Accepted: 04/19/2019] [Indexed: 01/03/2023]
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8
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Kundu P, Chattopadhyay N. Exogenous delivery of a pyrazole based bioactive probe to natural DNA through non-ionic TX-165 micellar carrier. J Drug Deliv Sci Technol 2019. [DOI: 10.1016/j.jddst.2018.12.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Valerón Bergh VJ, Johannessen E, Andersen T, Tønnesen HH. Evaluation of porphyrin loaded dry alginate foams containing poloxamer 407 and β-cyclodextrin-derivatives intended for wound treatment. Pharm Dev Technol 2017; 23:761-770. [DOI: 10.1080/10837450.2017.1314492] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
| | - Elin Johannessen
- School of Pharmacy, Department of Pharmaceutics, University of Oslo, Oslo, Norway
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10
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Valerón Bergh VJ, Tønnesen HH. Interactions and solubilization of 5, 10, 15, 20-tetrakis(4-hydroxyphenyl)porphyrin with poloxamer 407 and β-cyclodextrin-derivatives in binary and ternary systems. J Drug Deliv Sci Technol 2017. [DOI: 10.1016/j.jddst.2016.11.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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11
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Valero M, Castiglione F, Mele A, da Silva MA, Grillo I, González-Gaitano G, Dreiss CA. Competitive and Synergistic Interactions between Polymer Micelles, Drugs, and Cyclodextrins: The Importance of Drug Solubilization Locus. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:13174-13186. [PMID: 27951706 DOI: 10.1021/acs.langmuir.6b03367] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Polymeric micelles, in particular PEO-PPO-based Pluronic, have emerged as promising drug carriers, while cyclodextrins (CD), cyclic oligosaccharides with an apolar cavity, have long been used for their capacity to form inclusion complexes with drugs. Dimethylated β-cyclodextrin (DIMEB) has the capacity to fully breakup F127 Pluronic micelles, while this effect is substantially hindered if drugs are loaded within the micellar aggregates. Four drugs were studied at physiological temperature: lidocaine (LD), pentobarbital sodium salt (PB), sodium naproxen (NP), and sodium salicylate (SAL); higher temperatures shift the equilibrium toward higher drug partitioning and lower drug/CD binding compared to 25 °C ( Valero, M.; Dreiss, C. A. Growth, Shrinking, and Breaking of Pluronic Micelles in the Presence of Drugs and/or β-Cyclodextrin, a Study by Small-Angle Neutron Scattering and Fluorescence Spectroscopy . Langmuir 2010 , 26 , 10561 - 10571 ). The impact of drugs on micellar structure was characterized by small-angle neutron scattering (SANS), while their solubilization locus was revealed by 2D NOESY NMR. UV and fluorescence spectroscopy, Dynamic and Static Light Scattering were employed to measure a range of micellar properties and drug:CD interactions: binding constant, drug partitioning within the micelles, critical micellar concentration of the loaded micelles, aggregation number (Nagg). Critically, time-resolved SANS (TR-SANS) reveal that micellar breakup in the presence of drugs is substantially slower (100s of seconds) than for the free micelles (<100 ms) ( Valero, M.; Grillo, I.; Dreiss, C. A. Rupture of Pluronic Micelles by Di-Methylated β-Cyclodextrin Is Not Due to Polypseudorotaxane Formation . J. Phys. Chem. B 2012 , 116 , 1273 - 1281 ). These results combined together give new insights into the mechanisms of protection of the drugs against CD-induced micellar breakup. The outcomes are practical guidelines to improve the design of drug delivery systems as well as a better understanding of competitive assembly mechanisms leading to shape and function modulation.
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Affiliation(s)
- Margarita Valero
- Dpto. Química Física, Facultad de Farmacia, Universidad de Salamanca , Campus Miguel de Unamuno, s/n, 37007 Salamanca, Spain
| | - Franca Castiglione
- Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano , Piazza L. Da Vinci 32, I-20133 Milano, Italy
| | - Andrea Mele
- Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano , Piazza L. Da Vinci 32, I-20133 Milano, Italy
| | - Marcelo A da Silva
- Institute of Pharmaceutical Science, King's College London , Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, United Kingdom
| | - Isabelle Grillo
- Institut Laue Langevin , 71 avenue des martyrs, B.P. 156, 38042 Grenoble Cedex 9, France
| | | | - Cécile A Dreiss
- Institute of Pharmaceutical Science, King's College London , Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, United Kingdom
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12
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Das S, Chatterjee DP, Ghosh R, Das P, Nandi AK. Water soluble stimuli-responsive star copolymers with multiple encapsulation and release properties. RSC Adv 2016. [DOI: 10.1039/c5ra26144a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Stimuli-responsive, water soluble, nontoxic, star-copolymers showing reversible encapsulation and release of hydrophobic dye/drug molecule with increasing temperature and decreasing pH.
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Affiliation(s)
- Sandip Das
- Polymer Science Unit
- Indian Association for the Cultivation of Science
- Kolkata-700 032
- India
| | - Dhruba P. Chatterjee
- Polymer Science Unit
- Indian Association for the Cultivation of Science
- Kolkata-700 032
- India
| | - Radhakanta Ghosh
- Polymer Science Unit
- Indian Association for the Cultivation of Science
- Kolkata-700 032
- India
| | - Pradip Das
- Polymer Science Unit
- Indian Association for the Cultivation of Science
- Kolkata-700 032
- India
| | - Arun K. Nandi
- Polymer Science Unit
- Indian Association for the Cultivation of Science
- Kolkata-700 032
- India
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Kundu P, Ghosh S, Das S, Chattopadhyay N. Cyclodextrin induced controlled delivery of a biological photosensitizer from a nanocarrier to DNA. Phys Chem Chem Phys 2016; 18:3685-93. [DOI: 10.1039/c5cp06174a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Addition of β-cyclodextrin to the micelle bound phenosafranin in the presence of ctDNA leads to quantitative transfer of the fluorophore from the micelle to the DNA.
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Affiliation(s)
- Pronab Kundu
- Department of Chemistry
- Jadavpur University
- Kolkata-700032
- India
| | - Saptarshi Ghosh
- Department of Chemistry
- Jadavpur University
- Kolkata-700032
- India
| | - Sinjan Das
- Department of Chemistry
- Jadavpur University
- Kolkata-700032
- India
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14
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Mondjinou YA, Hyun SH, Xiong M, Thong PL, Thompson DH. Impact of Mixed β-Cyclodextrin Ratios on Pluronic Rotaxanation Efficiency and Product Solubility. ACS APPLIED MATERIALS & INTERFACES 2015; 7:23831-6. [PMID: 26502827 PMCID: PMC4683156 DOI: 10.1021/acsami.5b01016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Water-soluble polyrotaxanes have been prepared under heterogeneous conditions from mixtures of β-cyclodextrin (β-CD), 2-hydroxypropyl-β-cyclodextrin (HP-β-CD), methyl-β-cyclodextrin, or 6-monoazido-β-cyclodextrin with 4-sulfobutyl ether-β-cyclodextrin (SBE-β-CD) and Pluronic L81 copolymer modified with cholesterol end caps. Threading reactions gave polyrotaxane products in modest chemical yield that were reflective of the β-CD feed ratios in the reaction. Polyrotaxanes containing mixtures of HP-β-CD and SBE-β-CD were screened and found to be biologically active in an in vitro model of Niemann-Pick Type C disease where they mobilize aberrantly stored cholesterol similarly to monomeric cyclodextrin controls.
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Affiliation(s)
- Yawo A. Mondjinou
- Purdue University, Department of Chemistry, Bindley Bioscience Center, Multi-disciplinary Cancer Research Facility, 1203 W. State Street, West Lafayette, IN 47907, USA
| | - Seok-Hee Hyun
- Purdue University, Department of Chemistry, Bindley Bioscience Center, Multi-disciplinary Cancer Research Facility, 1203 W. State Street, West Lafayette, IN 47907, USA
| | - Manxi Xiong
- Purdue University, Department of Chemistry, Bindley Bioscience Center, Multi-disciplinary Cancer Research Facility, 1203 W. State Street, West Lafayette, IN 47907, USA
| | - Pooi Ling Thong
- Purdue University, Department of Chemistry, Bindley Bioscience Center, Multi-disciplinary Cancer Research Facility, 1203 W. State Street, West Lafayette, IN 47907, USA
| | - David H. Thompson
- Purdue University, Department of Chemistry, Bindley Bioscience Center, Multi-disciplinary Cancer Research Facility, 1203 W. State Street, West Lafayette, IN 47907, USA
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15
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González-Gaitano G, da Silva MA, Radulescu A, Dreiss CA. Selective tuning of the self-assembly and gelation of a hydrophilic poloxamine by cyclodextrins. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:5645-5655. [PMID: 25938931 DOI: 10.1021/acs.langmuir.5b01081] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Complexes formed between cyclodextrins (CDs) and polymers - pseudopolyrotaxanes (PPRs) - are the starting point of a multitude of supramolecular structures, which are proposed for a wide range of biomedical and technological applications. In this work, we investigate the complexation of a range of cyclodextrins with Tetronic T1307, a four-arm block copolymer of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) with a pH-responsive central ethylene diamine spacer, and its impact on micellization and the sol-gel transition. At low concentrations, small-angle neutron scattering (SANS) combined with dynamic light scattering (DLS) measurements show the presence of spherical micelles with a highly hydrated shell and a dehydrated core. Increasing the temperature leads to more compact micelles and larger aggregation numbers, whereas acidic conditions induce a shrinking of the micelles, with fewer unimers per micelle and a more hydrated corona. At high concentrations, T1307 undergoes a sol-gel transition, which is suppressed at pH below the pKa,1 (4.6). SANS data analysis reveals that the gels result from a random packing of the micelles, which have an increasing aggregation number and increasingly dehydrated shell and hydrated core with the temperature. Native CDs (α, β, γ-CD) can complex T1307, resulting in the precipitation of a PPR. Instead, modified CDs compete with micellization to an extent that is critically dependent on the nature of the substitution. (1)H and ROESY NMR combined with SANS demonstrate that dimethylated β-CD can thread onto the polymer, preferentially binding to the PO units, thus hindering self-aggregation by solubilizing the hydrophobic block. The various CDs are able to modulate the onset of gelation and the extent of the gel phase, and the effect correlates with the ability of the CDs to disrupt the micelles, with the exception of a sulfated sodium salt of β-CD, which, while not affecting the CMT, is able to fully suppress the gel phase.
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Affiliation(s)
| | - Marcelo A da Silva
- ‡Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
| | - Aurel Radulescu
- §Jülich Center for Neutron Science, JCNS Outstation at MLZ, Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, 85747 Garching, Germany
| | - Cécile A Dreiss
- ‡Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
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16
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González-Gaitano G, Müller C, Radulescu A, Dreiss CA. Modulating the self-assembly of amphiphilic X-shaped block copolymers with cyclodextrins: structure and mechanisms. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:4096-4105. [PMID: 25785814 DOI: 10.1021/acs.langmuir.5b00334] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Inclusion complexes between cyclodextrins and polymers-so-called pseudopolyrotaxanes (PPR)-are at the origin of fascinating supramolecular structures, which are finding increasing uses in biomedical and technological fields. Here we explore the impact of both native and a range of modified cyclodextrins (CD) on the self-assembly of X-shaped poly(ethylene oxide)-poly(propylene oxide) block copolymers, so-called Tetronics or poloxamines, by focusing on Tetronic 904 (T904, Mw 6700). The effects are markedly dependent on the type and arrangement of the substituents on the macrocycle. While native CDs drive the formation of a solid PPR, most substituted CDs induce micellar breakup, with dimethylated β-CD (DIMEB) having the strongest impact and randomly substituted CDs a much weaker disruptive effect. Using native α-CD as a "molecular trap", we perform competitive binding experiments-where two types of CDs thread together onto the polymer chains-to establish that DIMEB indeed has the highest propensity to form an inclusion complex with the polymer, while hydroxypropylated CDs do not thread. 1D (1)H NMR and ROESY experiments confirm the formation of a soluble PPR with DIMEB in which the CD binds preferentially to the PO units, thus providing the drive for the observed demicellization. A combination of dynamic light scattering (DLS) and small-angle neutron scattering (SANS) is used to extract detailed structural parameters on the micelles. A binding model is proposed, which exploits the chemical shifts of selected protons from the CD in conjunction with the Hill equation, to prove that the formation of the PPR is a negatively cooperative process, in which threaded DIMEBs hamper the entrance of subsequent macrocycles.
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Affiliation(s)
- Gustavo González-Gaitano
- †Departamento de Química y Edafología, Facultad de Ciencias, Universidad de Navarra, 31080 Pamplona, Spain
| | - Céline Müller
- ‡Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
| | - Aurel Radulescu
- §Jülich Center for Neutron Science, JCNS Outstation at MLZ, Forschungszentrum Jülich GmbH, Lichtenbergstraße 1,85747 Garching, Germany
| | - Cécile A Dreiss
- ‡Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K
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17
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Shih KC, Li CY, Li WH, Lai HM. Fine structures of self-assembled beta-cyclodextrin/Pluronic in dilute and dense systems: a small angle X-ray scattering study. SOFT MATTER 2014; 10:7606-7614. [PMID: 25121472 DOI: 10.1039/c4sm01147c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The evolution of the fine structures of self-assembled polypseudorotaxane (PPR) in Pluronic (PL F108) solutions containing dilute to dense beta-cyclodextrin (β-CD) was illustrated for the first time by small angle X-ray scattering (SAXS). Dense β-CD (∼19 w/v%) was found feasible to be dispersed in 24% citric acid solution. 5% of PL F108 formed cylindrical micelles of 1 nm in radius and 8 nm in length in the presence of 24% citric acid through the dehydration of citric acid and citrate. PPR was formed through host-guest interaction between PL F108 and β-CD. In dilute β-CD system (1%), the single chains of PPR with separated β-CD stacks on PL F108 were formed. The numbers of β-CD in each stack increased from 1 to 4 on increasing β-CD concentration to 9%. In a dense β-CD system, PPR condensed to correlated structures majorly composed of two unit blocks through the hydrogen bonds between PPRs. Two distinguishable correlated domains with correlation lengths of 50 nm (marked α-phase) and 46 nm (marked β-phase) along the chains, but without fine periodic structure within each individual domain, were identified in the 10% β-CD solution. Periodic stacking of β-CD in the domains developed in the 12% solution. As β-CD concentration increased from 12 to 19%, the correlated heights of α and β phases reduced from 41 and 32 nm to 30 and 10 nm, respectively. There were 48 β-CDs that stabilized on each PL F108 chain in the 19% β-CD system, which is in good agreement with stoichiometry.
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Affiliation(s)
- Kuo-Chih Shih
- Department of Agricultural Chemistry, National Taiwan University, No. 1, Roosevelt Rd., Sec. 4, Taipei 10617, Taiwan.
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Namgung R, Mi Lee Y, Kim J, Jang Y, Lee BH, Kim IS, Sokkar P, Rhee YM, Hoffman AS, Kim WJ. Poly-cyclodextrin and poly-paclitaxel nano-assembly for anticancer therapy. Nat Commun 2014; 5:3702. [DOI: 10.1038/ncomms4702] [Citation(s) in RCA: 157] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2013] [Accepted: 03/21/2014] [Indexed: 01/06/2023] Open
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Brenner H. Conduction-only transport phenomena in compressible bivelocity fluids: diffuse interfaces and Korteweg stresses. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2014; 89:043020. [PMID: 24827345 DOI: 10.1103/physreve.89.043020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Indexed: 06/03/2023]
Abstract
"Diffuse interface" theories for single-component fluids—dating back to van der Waals, Korteweg, Cahn-Hilliard, and many others—are currently based upon an ad hoc combination of thermodynamic principles (built largely upon Helmholtz's free-energy potential) and so-called “nonclassical” continuum-thermomechanical principles (built largely upon Newtonian mechanics), with the latter originating with the pioneering work of Dunn and Serrin [Arch. Ration. Mech. Anal. 88, 95 (1985)]. By introducing into the equation governing the transport of energy the notion of an interstitial work-flux contribution, above and beyond the usual Fourier heat-flux contribution, namely, jq = -k∇T, to the energy flux, Dunn and Serrin provided a rational continuum-thermomechanical basis for the presence of Korteweg stresses in the equation governing the transport of linear momentum in compressible fluids. Nevertheless, by their failing to recognize the existence and fundamental need for an independent volume transport equation [Brenner, Physica A 349, 11 (2005)]—especially for the roles played therein by the diffuse volume flux j v and the rate of production of volume πν at a point of the fluid continuum—we argue that diffuse interface theories for fluids stand today as being both ad hoc and incomplete owing to their failure to recognize the need for an independent volume transport equation for the case of compressible fluids. In contrast, we point out that bivelocity hydrodynamics, as it already exists [Brenner, Phys. Rev. E 86, 016307 (2012)], provides a rational, non-ad hoc, and comprehensive theory of diffuse interfaces, not only for single-component fluids, but also for certain classes of crystalline solids [Danielewski and Wierzba, J. Phase Equilib. Diffus. 26, 573 (2005)]. Furthermore, we provide not only what we believe to be the correct constitutive equation for the Korteweg stress in the class of fluids that are constitutively Newtonian in their rheological response to imposed stresses but, equally importantly, we establish the explicit functional forms of Korteweg's phenomenological thermocapillary coefficients appearing therein.
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Affiliation(s)
- Howard Brenner
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
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Micutz M, Matalon E, Staicu T, Angelescu D, Ariciu AM, Rogozea A, Turcu IM, Ionita G. The influence of hydroxy propyl β-cyclodextrin on the micellar to gel transition in F127 solutions investigated at macro and nanoscale levels. NEW J CHEM 2014. [DOI: 10.1039/c4nj00123k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Mondjinou YA, McCauliff LA, Kulkarni A, Paul L, Hyun SH, Zhang Z, Wu Z, Wirth M, Storch J, Thompson DH. Synthesis of 2-hydroxypropyl-β-cyclodextrin/pluronic-based polyrotaxanes via heterogeneous reaction as potential Niemann-Pick type C therapeutics. Biomacromolecules 2013; 14:4189-97. [PMID: 24180231 PMCID: PMC4314287 DOI: 10.1021/bm400922a] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Five polyrotaxanes were synthesized by threading 2-hydroxypropyl-β-cyclodextrin (HP-β-CD) onto a variety of α,ω-ditriethylenediamino-N-carbamoyl-poly-(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (Pluronic) triblock copolymers using a two-pot strategy under heterogeneous, nonaqueous conditions. The threaded HP-β-CD units were retained on the pseudopolyrotaxane precursors by end-capping the branched diamine termini with sodium 2,4,6-trinitrobenzene sulfonate. Inclusion of the Pluronic copolymers within the HP-β-CD cavities was more favorable in nonpolar solvents, such as diethyl ether and n-hexane, both of which gave better coverage ratios than polar solvents. (1)H NMR and MALDI-TOF were used to estimate the average molecular weights of the purified polyrotaxane products. A globular morphology of aggregated polyrotaxanes was observed by tapping-mode AFM imaging of dried samples. Treatment of Niemann-Pick C (NPC) type 2-deficient fibroblasts with the polyrotaxane derivatives produced substantial reductions in sterol accumulation, as seen by diminished filipin staining in these cells, suggesting that Pluronic-based polyrotaxanes may be promising vehicles for delivery of HP-β-CD to cells with abnormal cholesterol accumulation.
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Affiliation(s)
- Yawo A. Mondjinou
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Leslie A. McCauliff
- Department of Nutritional Sciences, Rutgers University, 96 Lipman Drive, New Brunswick, New Jersey 08901-8525, United States
| | - Aditya Kulkarni
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Lake Paul
- Discovery Park - Bindley Biosciences Center, Purdue University, 1203 West State Street, West Lafayette, Indiana 47907, United States
| | - Seok-Hee Hyun
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Zhaorui Zhang
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Zhen Wu
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Mary Wirth
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Judith Storch
- Department of Nutritional Sciences, Rutgers University, 96 Lipman Drive, New Brunswick, New Jersey 08901-8525, United States
| | - David H. Thompson
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
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Pradal C, Jack KS, Grøndahl L, Cooper-White. JJ. Gelation Kinetics and Viscoelastic Properties of Pluronic and α-Cyclodextrin-Based Pseudopolyrotaxane Hydrogels. Biomacromolecules 2013; 14:3780-92. [DOI: 10.1021/bm401168h] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Singh PK, Nath S. Molecular Recognition Controlled Delivery of a Small Molecule from a Nanocarrier to Natural DNA. J Phys Chem B 2013; 117:10370-5. [DOI: 10.1021/jp402902k] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Prabhat K. Singh
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Sukhendu Nath
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
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Bleta R, Machut C, Léger B, Monflier É, Ponchel A. Coassembly of Block Copolymer and Randomly Methylated β-Cyclodextrin: From Swollen Micelles to Mesoporous Alumina with Tunable Pore Size. Macromolecules 2013. [DOI: 10.1021/ma4008303] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rudina Bleta
- Université Lille Nord de France, F-59000 Lille, France
- UCCS, Faculté des Sciences
Jean Perrin, Université d'Artois, Rue Jean Souvraz, SP 18, F-62307 Lens, France
- CNRS, UMR 8181, F-59650
Villeneuve d’Ascq, France
| | - Cécile Machut
- Université Lille Nord de France, F-59000 Lille, France
- UCCS, Faculté des Sciences
Jean Perrin, Université d'Artois, Rue Jean Souvraz, SP 18, F-62307 Lens, France
- CNRS, UMR 8181, F-59650
Villeneuve d’Ascq, France
| | - Bastien Léger
- Université Lille Nord de France, F-59000 Lille, France
- UCCS, Faculté des Sciences
Jean Perrin, Université d'Artois, Rue Jean Souvraz, SP 18, F-62307 Lens, France
- CNRS, UMR 8181, F-59650
Villeneuve d’Ascq, France
| | - Éric Monflier
- Université Lille Nord de France, F-59000 Lille, France
- UCCS, Faculté des Sciences
Jean Perrin, Université d'Artois, Rue Jean Souvraz, SP 18, F-62307 Lens, France
- CNRS, UMR 8181, F-59650
Villeneuve d’Ascq, France
| | - Anne Ponchel
- Université Lille Nord de France, F-59000 Lille, France
- UCCS, Faculté des Sciences
Jean Perrin, Université d'Artois, Rue Jean Souvraz, SP 18, F-62307 Lens, France
- CNRS, UMR 8181, F-59650
Villeneuve d’Ascq, France
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Miller T, van Colen G, Sander B, Golas MM, Uezguen S, Weigandt M, Goepferich A. Drug Loading of Polymeric Micelles. Pharm Res 2012; 30:584-95. [DOI: 10.1007/s11095-012-0903-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Accepted: 10/08/2012] [Indexed: 11/28/2022]
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Liu Z, Gu J, Wu M, Jiang S, Wu D, Wang Q, Niu Z, Huang Y. Nonionic block copolymers assemble on the surface of protein bionanoparticle. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:11957-11961. [PMID: 22877605 DOI: 10.1021/la302588f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Efficient delivery of therapeutic proteins to a target site remains a challenge due to rapid clearance from the body. Here, we selected tobacco mosaic virus (TMV) as a model protein system to investigate the interactions between the protein and a nonionic block copolymer as a possible protecting agent for the protein. By varying the temperature, we were able to obtain core-shell structures based on hydrophobic interactions among PO blocks and noncovalent interactions between TMV and EO blocks. The protein-polymer interactions were characterized by dynamic light scattering and isothermal titration calorimetry. This study establishes principles for the possible design of clinically useful protein delivery systems.
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Affiliation(s)
- Zhi Liu
- National Research Centre of Engineering Plastics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China
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How to conduct and interpret ITC experiments accurately for cyclodextrin–guest interactions. Drug Discov Today 2012; 17:623-9. [DOI: 10.1016/j.drudis.2012.01.023] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2011] [Revised: 12/08/2011] [Accepted: 01/26/2012] [Indexed: 01/01/2023]
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Valero M, Grillo I, Dreiss CA. Rupture of Pluronic Micelles by Di-Methylated β-Cyclodextrin Is Not Due to Polypseudorotaxane Formation. J Phys Chem B 2012; 116:1273-81. [DOI: 10.1021/jp210439n] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Margarita Valero
- Departamento de Química Física, Facultad de Farmacia, Universidad de Salamanca, 37008 Salamanca, Spain
| | - Isabelle Grillo
- Institut Laue-Langevin (ILL), DS/LSS, 6, rue Jules Horowitz, B.P. 156, 38042 Grenoble Cedex, France
| | - Cécile A. Dreiss
- Institute of Pharmaceutical Science, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, United Kingdom
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Sambe L, Stoffelbach F, Lyskawa J, Delattre F, Fournier D, Bouteiller L, Charleux B, Cooke G, Woisel P. Host–Guest Modulation of the Micellization of a Tetrathiafulvalene-Functionalized Poly(N-isopropylacrylamide). Macromolecules 2011. [DOI: 10.1021/ma2009854] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Léna Sambe
- Université Lille Nord de France, F-59000 Lille, France
- USTL, Unité des Matériaux Et Transformations (UMET, UMR 8207), Equipe Ingénierie des Systèmes polymères (ISP), F-59655 Villeneuve d’Ascq Cedex, France
| | - François Stoffelbach
- UMR 7610, Laboratoire de Chimie des Polymères, UPMC Université Paris 6—CNRS, 3, rue Galilée 94200 Ivry sur Seine, France
| | - Joel Lyskawa
- Université Lille Nord de France, F-59000 Lille, France
- USTL, Unité des Matériaux Et Transformations (UMET, UMR 8207), Equipe Ingénierie des Systèmes polymères (ISP), F-59655 Villeneuve d’Ascq Cedex, France
| | - François Delattre
- UCEIV (Unité de Chimie Environnementale et Interactions sur le Vivant), EA 4492, Université du Littoral Côte d’Opale, Av. M. Schumann 59140 Dunkerque, France
| | - David Fournier
- Université Lille Nord de France, F-59000 Lille, France
- USTL, Unité des Matériaux Et Transformations (UMET, UMR 8207), Equipe Ingénierie des Systèmes polymères (ISP), F-59655 Villeneuve d’Ascq Cedex, France
| | - Laurent Bouteiller
- UMR 7610, Laboratoire de Chimie des Polymères, UPMC Université Paris 6—CNRS, 3, rue Galilée 94200 Ivry sur Seine, France
| | - Bernadette Charleux
- CPE Lyon, CNRS UMR 5265, Laboratoire de Chimie Catalyse Polymères et Procédés (C2P2), Equipe LCPP Bat 308F, Université de Lyon, Université Lyon 1, 43 Bd du11 novembre 1918, F-69616 Villeurbanne, France
| | - Graeme Cooke
- Glasgow Centre for Physical Organic Chemistry, WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, Glasgow, U.K., G12 8QQ, U.K
| | - Patrice Woisel
- Université Lille Nord de France, F-59000 Lille, France
- USTL, Unité des Matériaux Et Transformations (UMET, UMR 8207), Equipe Ingénierie des Systèmes polymères (ISP), F-59655 Villeneuve d’Ascq Cedex, France
- ENSCL, F-59655 Villeneuve d’Ascq, France
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Castiglione F, Valero M, Dreiss CA, Mele A. Selective interaction of 2,6-di-O-methyl-β-cyclodextrin and Pluronic F127 micelles leading to micellar rupture: a nuclear magnetic resonance study. J Phys Chem B 2011; 115:9005-13. [PMID: 21667967 DOI: 10.1021/jp203753r] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The triblock-copolymer poly(ethylene oxide)-poly(propyleneoxide)-poly(ethylene oxide) (PEO-PPO-PEO), referred to as Pluronic, is widely studied for its unique aggregation properties and its applications in drug delivery and targeting. In previous studies [Dreiss, C. A.; et al. Soft Matter 2009, 5, 1888-1896], we showed that the interaction of heptakis (2,6-di-O-methyl)-β cyclodextrin (DIMEB) with the triblock-copolymer Pluronic F127 in solutions above the CMC led to complete disruption of the polymeric micelles, while similar β cyclodextrins (βCD) derivatives, heptakis (2,3,6-tri-O-methyl)-βCD (TRIMEB), hydroxypropyl-βCD (HPBCD), and hydroxyethyl-βCD (HEBCD), did not induce micellar break-up. In this work, nuclear magnetic resonance spectroscopy experiments were used to elucidate the nature of the interactions leading to break-up and highlight differences between the four βCD derivatives studied, which could explain the very different outcome observed. Intermolecular nuclear Overhauser enhancements (NOEs) show that both DIMEB and TRIMEB interact selectively with the PPO methyl groups of F127 in a similar way. The interaction is mainly with the external methyl groups in the 6-position of the glucopyranose units of cyclodextrins. However, a weak but detectable interaction with the inner cyclodextrins protons is also observed. These interactions, both with the external surface and with the cavity of βCD, suggest the formation of a loose complex, rather than the widely invoked pseudorotaxane type of inclusion. In addition, these interactions seem to be necessary but not sufficient to induce micellar break-up. Diffusion measurements show decreased diffusivity of DIMEB in the presence of F127 to a larger extent than the other CD derivatives, thus confirming the unique behavior of DIMEB toward F127 polymer. From the diffusion coefficients, an average of 1 DIMEB molecule per 4.2 PO groups of F127 is determined for the highest concentration of DIMEB considered (11 wt % DIMEB dissolved in 5 wt % F127). Micellar break-up is complete at a concentration as low as 1 DIMEB molecule per 8.2 PO units.
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Affiliation(s)
- Franca Castiglione
- Department of Chemistry, Materials and Chemical Engineering G. Natta, Politecnico di Milano, Piazza L. Da Vinci 32 I-20133, Milano, Italy
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Portnaya I, Khalfin R, Kesselman E, Ramon O, Cogan U, Danino D. Mixed micellization between natural and synthetic block copolymers: β-casein and Lutrol F-127. Phys Chem Chem Phys 2011; 13:3153-60. [DOI: 10.1039/c0cp01321h] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Self-assembly of β-cyclodextrin and pluronic into hollow nanospheres in aqueous solution. J Colloid Interface Sci 2010; 350:447-52. [DOI: 10.1016/j.jcis.2010.07.019] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2010] [Revised: 07/06/2010] [Accepted: 07/10/2010] [Indexed: 11/23/2022]
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Zhang D, Zhang H, Nie J, Yang J. Synthesis and self-assembly behavior of pH-responsive amphiphilic copolymers containing ketal functional groups. POLYM INT 2010. [DOI: 10.1002/pi.2814] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Volet G, Auvray L, Amiel C. Monoalkyl poly(2-methyl-2-oxazoline) micelles. a small-angle neutron scattering study. J Phys Chem B 2009; 113:13536-44. [PMID: 19769344 DOI: 10.1021/jp9029634] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This paper presents a SANS study of hydrophobically end-modified poly(2-methyl-2-oxazoline) (POXZ-C(n)) micelles in aqueous solutions. Strong long-range repulsive interactions between the micelles are evidenced by correlation peaks present at concentrations as low as 0.5 wt %. Due to the dissymmetry in size between the hydrophobic and hydrophilic parts of the chains, the micelles have been analyzed using a model of star-like micelles. Large extension of the POXZ arms into the micelles can explain the original SANS behavior. The dissociation of the micellar structures by adding a complexing agent of the alkyl groups, hydroxypropy-beta-cyclodextrin (HPbeta-CD), has been followed by SANS. The micelles are progressively disrupted by the addition of increasing amounts of HPbeta-CD, and the SANS behavior of free chains is recovered in the presence of an excess of the complexing agent.
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Affiliation(s)
- Gisèle Volet
- Systèmes Polymères Complexes, Institut de Chimie et des Matériaux Paris-Est, 2 rue Henri Dunant, 94320 Thiais, France.
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Oertel U, Komber H, Tenkovtsev AV, Dudkina MM, Trofimov AE, Böhme F. Ionic pseudopolyrotaxanes bearing a chromophore in the side chain – A spectroscopic study in water. POLYMER 2009. [DOI: 10.1016/j.polymer.2009.10.064] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Briley-Saebo KC, Geninatti-Crich S, Cormode DP, Barazza A, Mulder WJM, Chen W, Giovenzana GB, Fisher EA, Aime S, Fayad ZA. High-relaxivity gadolinium-modified high-density lipoproteins as magnetic resonance imaging contrast agents. J Phys Chem B 2009; 113:6283-9. [PMID: 19361222 PMCID: PMC2688742 DOI: 10.1021/jp8108286] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
There is an ongoing desire to produce high-relaxivity, Gd-based magnetic resonance imaging (MRI) contrast agents. These may allow for lower doses to be used, which is especially important in view of the current safety concerns surrounding Gd in patients. Here we report the synthesis of a high-relaxivity MRI contrast agent, by incorporating Gd-chelating lipids that coordinate two water molecules into high-density lipoprotein (q = 2 HDL). We compared the properties of q = 2 HDL with those of an analogous HDL particle labeled with Gd-chelating lipids that coordinate only one water molecule (q = 1 HDL). We found that the q = 2 HDL possessed an elevated r(1) of 41 mM(-1) s(-1) compared to 9 mM(-1) s(-1) for q = 1 HDL at 20 MHz, but the q = 2 HDL exhibited high R(2)* values at high fields, precluding imaging above 128 MHz. While carrying out this investigation we observed that enlarged, disrupted particles were formed when the synthesis was carried out above the lipid critical micelle concentration (cmc), indicating the importance of synthesis below the cmc when modifying lipoproteins in this manner. The high relaxivity of q = 2 HDL means it will be an efficacious contrast agent for future MR imaging studies.
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Affiliation(s)
| | | | | | - Alessandra Barazza
- Mount Sinai School of Medicine, New York, NY
- New York University School of Medicine, New York, NY
| | | | - Wei Chen
- Mount Sinai School of Medicine, New York, NY
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Nogueiras-Nieto L, Alvarez-Lorenzo C, Sandez-Macho I, Concheiro A, Otero-Espinar FJ. Hydrosoluble Cyclodextrin/Poloxamer Polypseudorotaxanes at the Air/Water Interface, in Bulk Solution, and in the Gel State. J Phys Chem B 2009; 113:2773-82. [DOI: 10.1021/jp809806w] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Luis Nogueiras-Nieto
- Departamento de Farmacia y Tecnologia Farmaceutica and Departamento de Quimica Fisica, Universidad de Santiago de Compostela, 15782-Santiago de Compostela, Spain
| | - Carmen Alvarez-Lorenzo
- Departamento de Farmacia y Tecnologia Farmaceutica and Departamento de Quimica Fisica, Universidad de Santiago de Compostela, 15782-Santiago de Compostela, Spain
| | - Isabel Sandez-Macho
- Departamento de Farmacia y Tecnologia Farmaceutica and Departamento de Quimica Fisica, Universidad de Santiago de Compostela, 15782-Santiago de Compostela, Spain
| | - Angel Concheiro
- Departamento de Farmacia y Tecnologia Farmaceutica and Departamento de Quimica Fisica, Universidad de Santiago de Compostela, 15782-Santiago de Compostela, Spain
| | - Francisco J. Otero-Espinar
- Departamento de Farmacia y Tecnologia Farmaceutica and Departamento de Quimica Fisica, Universidad de Santiago de Compostela, 15782-Santiago de Compostela, Spain
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Jiang X, Zhao B. Tuning Micellization and Dissociation Transitions of Thermo- and pH-Sensitive Poly(ethylene oxide)-b-poly(methoxydi(ethylene glycol) methacrylate-co-methacrylic acid) in Aqueous Solution by Combining Temperature and pH Triggers. Macromolecules 2008. [DOI: 10.1021/ma8018238] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xueguang Jiang
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
| | - Bin Zhao
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
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Lazzara G, Milioto S. Copolymer−Cyclodextrin Inclusion Complexes in Water and in the Solid State. A Physico-Chemical Study. J Phys Chem B 2008; 112:11887-95. [DOI: 10.1021/jp8034924] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- G. Lazzara
- Dipartimento di Chimica Fisica “F. Accascina”, Università degli Studi di Palermo, Viale delle Scienze, Parco D’Orleans II, 90128 Palermo, Italy
| | - S. Milioto
- Dipartimento di Chimica Fisica “F. Accascina”, Università degli Studi di Palermo, Viale delle Scienze, Parco D’Orleans II, 90128 Palermo, Italy
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Jiang X, Lavender CA, Woodcock JW, Zhao B. Multiple Micellization and Dissociation Transitions of Thermo- and Light-Sensitive Poly(ethylene oxide)-b-poly(ethoxytri(ethylene glycol) acrylate-co-o-nitrobenzyl acrylate) in Water. Macromolecules 2008. [DOI: 10.1021/ma7028105] [Citation(s) in RCA: 178] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xueguang Jiang
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
| | | | | | - Bin Zhao
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
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Mileo E, Franchi P, Gotti R, Bendazzoli C, Mezzina E, Lucarini M. An EPR method for measuring the rate of distribution of organic substrates between cyclodextrin, micelles and water. Chem Commun (Camb) 2008:1311-3. [DOI: 10.1039/b718049g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Huang J, Ren L, Chen Y. pH-/temperature-sensitive supramolecular micelles based on cyclodextrin polyrotaxane. POLYM INT 2007. [DOI: 10.1002/pi.2396] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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