1
|
Kost B, Brzeziński M, Socka M, Baśko M, Biela T. Biocompatible Polymers Combined with Cyclodextrins: Fascinating Materials for Drug Delivery Applications. Molecules 2020; 25:E3404. [PMID: 32731371 PMCID: PMC7435941 DOI: 10.3390/molecules25153404] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 07/23/2020] [Accepted: 07/24/2020] [Indexed: 12/12/2022] Open
Abstract
Cyclodextrins (CD) are a group of cyclic oligosaccharides with a cavity/specific structure that enables to form inclusion complexes (IC) with a variety of molecules through non-covalent host-guest interactions. By an elegant combination of CD with biocompatible, synthetic and natural polymers, different types of universal drug delivery systems with dynamic/reversible properties have been generated. This review presents the design of nano- and micro-carriers, hydrogels, and fibres based on the polymer/CD supramolecular systems highlighting their possible biomedical applications. Application of the most prominent hydrophobic aliphatic polyesters that exhibit biodegradability, represented by polylactide and polycaprolactone, is described first. Subsequently, particular attention is focused on materials obtained from hydrophilic polyethylene oxide. Moreover, examples are also presented for grafting of CD on polysaccharides. In summary, we show the application of host-guest interactions in multi-component functional biomaterials for controlled drug delivery.
Collapse
Affiliation(s)
- Bartłomiej Kost
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland; (M.S.); (M.B.); (T.B.)
| | - Marek Brzeziński
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland; (M.S.); (M.B.); (T.B.)
| | | | | | | |
Collapse
|
2
|
Hesler M, Schwarz DH, Dähnhardt-Pfeiffer S, Wagner S, von Briesen H, Wenz G, Kohl Y. Synthesis and in vitro evaluation of cyclodextrin hyaluronic acid conjugates as a new candidate for intestinal drug carrier for steroid hormones. Eur J Pharm Sci 2019; 143:105181. [PMID: 31852628 DOI: 10.1016/j.ejps.2019.105181] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 11/28/2019] [Accepted: 12/10/2019] [Indexed: 12/17/2022]
Abstract
Steroid hormones became increasingly interesting as active pharmaceutical ingredients for the treatment of endocrine disorders. However, medical applications of many steroidal drugs are inhibited by their very low aqueous solubilities giving rise to low bioavailabilities. Therefore, the prioritized oral administration of steroidal drugs remains problematic. Cyclodextrins are promising candidates for the development of drug delivery systems for oral route applications, since they solubilize hydrophobic steroids and increase their rate of transport in aqueous environments. In this study, the synthesis and characterization of polymeric β-cyclodextrin derivates is described, which result from the attachment of a hydrophilic β-CD-thioether to hyaluronic acid. Host-guest complexes of the synthesized β-cyclodextrin hyaluronic acid conjugates were formed with two poorly soluble model steroids (β-estradiol, dexamethasone) and compared to monomeric β-cyclodextrin derivates regarding solubilization and complexation efficiency. The β-cyclodextrin-drug (host-guest) complexes were evaluated in vitro for their suitability (cytotoxicity and transport rate) as intestinal drug carriers for steroid hormones. In case of β-estradiol, higher solubilities could be achieved by complexation with both synthesized β-cyclodextrin derivates, leading to significantly higher intestinal transport rates in vitro. However, this success could not be shown for dexamethasone, which namely solubilized better, but could not enhance the transport rate significantly. Thus, this study demonstrates the biocompatibility of the synthesized and characterized β-cyclodextrin derivates and shows their potential as new candidate for intestinal drug carrier for steroid hormones like β-estradiol.
Collapse
Affiliation(s)
- Michelle Hesler
- Fraunhofer Institute for Biomedical Engineering, Department Bioprocessing & Bioanalytics, Joseph-von-Fraunhofer-Weg 1, 66280 Sulzbach, Germany.
| | - Dennis H Schwarz
- Saarland University, Organic Macromolecular Chemistry, 66123 Saarbrücken, Germany.
| | | | - Sylvia Wagner
- Fraunhofer Institute for Biomedical Engineering, Department Bioprocessing & Bioanalytics, Joseph-von-Fraunhofer-Weg 1, 66280 Sulzbach, Germany.
| | - Hagen von Briesen
- Fraunhofer Institute for Biomedical Engineering, Department Bioprocessing & Bioanalytics, Joseph-von-Fraunhofer-Weg 1, 66280 Sulzbach, Germany.
| | - Gerhard Wenz
- Saarland University, Organic Macromolecular Chemistry, 66123 Saarbrücken, Germany.
| | - Yvonne Kohl
- Fraunhofer Institute for Biomedical Engineering, Department Bioprocessing & Bioanalytics, Joseph-von-Fraunhofer-Weg 1, 66280 Sulzbach, Germany.
| |
Collapse
|
3
|
Myrick JM, Vendra VK, Le NT, Sexton FA, Krishnan S. Controlled Release of Glucose from Orally Delivered Temperature- and pH-Responsive Polysaccharide Microparticle Dispersions. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b02402] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- James M. Myrick
- Department of Chemical and Biomolecular Engineering, Clarkson University, Potsdam, New York 13699, United States
| | - Venkat K. Vendra
- Department of Chemical and Biomolecular Engineering, Clarkson University, Potsdam, New York 13699, United States
| | - Ngoc-Tram Le
- Department of Chemical and Biomolecular Engineering, Clarkson University, Potsdam, New York 13699, United States
| | | | - Sitaraman Krishnan
- Department of Chemical and Biomolecular Engineering, Clarkson University, Potsdam, New York 13699, United States
| |
Collapse
|
4
|
Moncada-Basualto M, Matsuhiro B, Mansilla A, Lapier M, Maya J, Olea-Azar C. Supramolecular hydrogels of β-cyclodextrin linked to calcium homopoly-l-guluronate for release of coumarins with trypanocidal activity. Carbohydr Polym 2019; 204:170-181. [DOI: 10.1016/j.carbpol.2018.10.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 09/11/2018] [Accepted: 10/04/2018] [Indexed: 12/26/2022]
|
5
|
Crini G, Fourmentin S, Fenyvesi É, Torri G, Fourmentin M, Morin-Crini N. Fundamentals and Applications of Cyclodextrins. ENVIRONMENTAL CHEMISTRY FOR A SUSTAINABLE WORLD 2018. [DOI: 10.1007/978-3-319-76159-6_1] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
6
|
Alvarez-Lorenzo C, García-González CA, Concheiro A. Cyclodextrins as versatile building blocks for regenerative medicine. J Control Release 2017; 268:269-281. [PMID: 29107127 DOI: 10.1016/j.jconrel.2017.10.038] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 10/25/2017] [Accepted: 10/26/2017] [Indexed: 01/05/2023]
Abstract
Cyclodextrins (CDs) are one of the most versatile substances produced by nature, and it is in the aqueous biological environment where the multifaceted potential of CDs can be completely unveiled. CDs form inclusion complexes with a variety of guest molecules, including polymers, producing very diverse biocompatible supramolecular structures. Additionally, CDs themselves can trigger cell differentiation to distinct lineages depending on the substituent groups and also promote salt nucleation. These features together with the affinity-driven regulated release of therapeutic molecules, growth factors and gene vectors explain the rising interest for CDs as building blocks in regenerative medicine. Supramolecular poly(pseudo)rotaxane structures and zipper-like assemblies exhibit outstanding viscoelastic properties, performing as syringeable implants. The sharp shear-responsiveness of the supramolecular assemblies is opening new avenues for the design of bioinks for 3D printing and also of electrospun fibers. CDs can also be transformed into polymerizable monomers to prepare alternative nanostructured materials. The aim of this review is to analyze the role that CDs may play in regenerative medicine through the analysis of the last decade research. Most applications of CD-based scaffolds are focussed on non-healing bone fractures, cartilage reparation and skin recovery, but also on even more challenging demands such as neural grafts. For the sake of clarity, main sections of this review are organized according to the architecture of the CD-based scaffolds, mainly syringeable supramolecular hydrogels, 3D printed scaffolds, electrospun fibers, and composites, since the same scaffold type may find application in different tissues.
Collapse
Affiliation(s)
- Carmen Alvarez-Lorenzo
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, R+D Pharma Group (GI-1645), Facultad de Farmacia and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, 15872 Santiago de Compostela, Spain.
| | - Carlos A García-González
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, R+D Pharma Group (GI-1645), Facultad de Farmacia and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, 15872 Santiago de Compostela, Spain
| | - Angel Concheiro
- Departamento de Farmacología, Farmacia y Tecnología Farmacéutica, R+D Pharma Group (GI-1645), Facultad de Farmacia and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, 15872 Santiago de Compostela, Spain
| |
Collapse
|
7
|
Simões SMN, Rey-Rico A, Concheiro A, Alvarez-Lorenzo C. Supramolecular cyclodextrin-based drug nanocarriers. Chem Commun (Camb) 2015; 51:6275-89. [DOI: 10.1039/c4cc10388b] [Citation(s) in RCA: 119] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Hosting of polymers, lipids and drug conjugates makes cyclodextrins suitable to prepare biocompatible, targetable and stimuli-responsive supramolecular drug nanocarriers.
Collapse
Affiliation(s)
- Susana M. N. Simões
- Faculty of Pharmacy
- University of Coimbra
- Coimbra
- Portugal
- Center for Neuroscience and Cell Biology
| | - Ana Rey-Rico
- Departamento de Farmacia y Tecnología Farmacéutica
- Facultad de Farmacia
- Universidad de Santiago de Compostela
- Santiago de Compostela
- Spain
| | - Angel Concheiro
- Departamento de Farmacia y Tecnología Farmacéutica
- Facultad de Farmacia
- Universidad de Santiago de Compostela
- Santiago de Compostela
- Spain
| | - Carmen Alvarez-Lorenzo
- Departamento de Farmacia y Tecnología Farmacéutica
- Facultad de Farmacia
- Universidad de Santiago de Compostela
- Santiago de Compostela
- Spain
| |
Collapse
|
8
|
Ogbonnaya OU, Adebisi OO, Semple KT. The impact of biochar on the bioaccessibility of (14)C-phenanthrene in aged soil. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2014; 16:2635-2643. [PMID: 25277257 DOI: 10.1039/c4em00396a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Biochar is a carbon rich product from the incomplete combustion of biomass and it has been shown to reduce bioavailability of organic contaminants through adsorption. This study investigated the influence of 0%, 1%, 5% and 10% of two different particle sized wood biochars (≤2 mm and 3-7 mm) on the bioaccessibility of (14)C-phenanthrene (10 mg kg(-1)) in aged soil. The extent of (14)C-phenanthrene mineralisation by phenanthrene-degrading Pseudomonas sp. inoculum was monitored over a 14 day period in respirometric assays and compared to hydroxypropyl-β-cyclodextrin (HPCD) aqueous extraction. Notably, biochar amendments showed significant reduction in extents of mineralisation and HPCD extraction. Linear correlations between HPCD extractability and the total amount mineralised revealed good correlations, with 2 mm biochar showing a best fit (r(2) = 0.97, slope = 1.11, intercept = 1.72). Biochar reduced HPCD extractability and bioaccessibility of (14)C-phenanthrene to microorganisms in a similar manner. Biochar can aid risk reduction to phenanthrene exposure to biota in soil and HPCD can serve as a useful tool to assess the extent of exposure in biochar-amended soils.
Collapse
Affiliation(s)
- O U Ogbonnaya
- EcoSystems Environmental Management Services Ltd, 8 Rasheed Alaba Williams Street, Off Admiralty Way, Lekki Peninsula, Lagos, Nigeria.
| | | | | |
Collapse
|
9
|
Simões SM, Veiga F, Ribeiro AC, Figueiras AR, Taboada P, Concheiro A, Alvarez-Lorenzo C. Supramolecular gels of poly-α-cyclodextrin and PEO-based copolymers for controlled drug release. Eur J Pharm Biopharm 2014; 87:579-88. [DOI: 10.1016/j.ejpb.2014.04.006] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Revised: 04/15/2014] [Accepted: 04/16/2014] [Indexed: 11/27/2022]
|
10
|
Valente AJM, Söderman O. The formation of host-guest complexes between surfactants and cyclodextrins. Adv Colloid Interface Sci 2014; 205:156-76. [PMID: 24011696 DOI: 10.1016/j.cis.2013.08.001] [Citation(s) in RCA: 133] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Revised: 08/01/2013] [Accepted: 08/01/2013] [Indexed: 11/15/2022]
Abstract
Cyclodextrins are able to act as host molecules in supramolecular chemistry with applications ranging from pharmaceutics to detergency. Among guest molecules surfactants play an important role with both fundamental and practical applications. The formation of cyclodextrin/surfactant host-guest compounds leads to an increase in the critical micelle concentration and in the solubility of surfactants. The possibility of changing the balance between several intermolecular forces, and thus allowing the study of, e.g., dehydration and steric hindrance effects upon association, makes surfactants ideal guest molecules for fundamental studies. Therefore, these systems allow for obtaining a deep insight into the host-guest association mechanism. In this paper, we review the influence on the thermodynamic properties of CD-surfactant association by highlighting the effect of different surfactant architectures (single tail, double-tailed, gemini and bolaform), with special emphasis on cationic surfactants. This is complemented with an assessment of the most common analytical techniques used to follow the association process. The applied methods for computation of the association stoichiometry and stability constants are also reviewed and discussed; this is an important point since there are significant discrepancies and scattered data for similar systems in the literature. In general, the surfactant-cyclodextrin association is treated without reference to the kinetics of the process. However, there are several examples where the kinetics of the process can be investigated, in particular those where volumes of the CD cavity and surfactant (either the tail or in special cases the head group) are similar in magnitude. This will also be critically reviewed.
Collapse
Affiliation(s)
- Artur J M Valente
- Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Olle Söderman
- Division of Physical Chemistry, Center for Chemistry and Chemical Engineering, Lund University, Lund, Sweden
| |
Collapse
|
11
|
Chen Q, Han X, Peng S, He J, Deng M, Zhao Y, Jiang B. Preparation of amphotericN,O-carboxymethyl hydroxypropyl chitosan by a two-step reaction. J Appl Polym Sci 2014. [DOI: 10.1002/app.40460] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Qiong Chen
- Key Laboratory of Green Chemistry and Technology, College of Chemistry; Sichuan University; Chengdu 610064 China
| | - Xiaoxiao Han
- Key Laboratory of Green Chemistry and Technology, College of Chemistry; Sichuan University; Chengdu 610064 China
| | - Shuhua Peng
- Jingkun Chemical Company; Kunshan 215300 China
| | - Jianping He
- Jingkun Chemical Company; Kunshan 215300 China
| | - Mingyu Deng
- Jingkun Chemical Company; Kunshan 215300 China
| | - Yongchao Zhao
- Key Laboratory of Green Chemistry and Technology, College of Chemistry; Sichuan University; Chengdu 610064 China
| | - Bo Jiang
- Key Laboratory of Green Chemistry and Technology, College of Chemistry; Sichuan University; Chengdu 610064 China
| |
Collapse
|
12
|
García-Fernández M, Tabary N, Martel B, Cazaux F, Oliva A, Taboada P, Concheiro A, Alvarez-Lorenzo C. Poly-(cyclo)dextrins as ethoxzolamide carriers in ophthalmic solutions and in contact lenses. Carbohydr Polym 2013; 98:1343-52. [DOI: 10.1016/j.carbpol.2013.08.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2013] [Revised: 07/29/2013] [Accepted: 08/01/2013] [Indexed: 11/15/2022]
|
13
|
Rodell CB, Kaminski AL, Burdick JA. Rational design of network properties in guest-host assembled and shear-thinning hyaluronic acid hydrogels. Biomacromolecules 2013; 14:4125-34. [PMID: 24070551 DOI: 10.1021/bm401280z] [Citation(s) in RCA: 277] [Impact Index Per Article: 25.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Shear-thinning hydrogels afford direct injection or catheter delivery to tissues without potential premature gel formation and delivery failure or the use of triggers such as chemical initiators or heat. However, many shear-thinning hydrogels require long reassembly times or exhibit rapid erosion. We developed a shear-thinning hyaluronic acid (HA) hydrogel based on the guest-host interactions of adamantane modified HA (guest macromer, Ad-HA) and β-cyclodextrin modified HA (host macromer, CD-HA). The ability of the guest and host molecules to interact with their counterpart following conjugation to HA was confirmed by (1)H NMR spectroscopy and was similar to that of the native complex. Mixing of Ad-HA and CD-HA resulted in rapid formation of a hydrogel composed of guest-host bonds. The hydrogel physical properties, including mechanics and flow characteristics, were dependent on cross-link density and network structure, which were controlled through macromer concentration, the extent of guest macromer modification, and the molar ratio of guest and host functional groups. The guest-host assembly mechanism permitted both shear-thinning behavior for ease of injection and near-instantaneous reassembly for material retention at the target sight. The hydrogel erosion and release of a model biomolecule were also dependent on design parameters and were sustained for over 60 days. These hydrogels show potential as a minimally invasive injectable hydrogel for biomedical applications.
Collapse
Affiliation(s)
- Christopher B Rodell
- Department of Bioengineering, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States
| | | | | |
Collapse
|
14
|
Injectable nanomaterials for drug delivery: Carriers, targeting moieties, and therapeutics. Eur J Pharm Biopharm 2013; 84:1-20. [DOI: 10.1016/j.ejpb.2012.12.009] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Revised: 12/07/2012] [Accepted: 12/10/2012] [Indexed: 02/07/2023]
|
15
|
El Fagui A, Amiel C. PLA nanoparticles coated with a β-cyclodextrin polymer shell: Preparation, characterization and release kinetics of a hydrophobic compound. Int J Pharm 2012; 436:644-51. [DOI: 10.1016/j.ijpharm.2012.07.052] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Revised: 07/20/2012] [Accepted: 07/20/2012] [Indexed: 01/01/2023]
|
16
|
Amiel C, Wintgens V, Nielsen TT, Larsen KL. Tailorable Polymeric Assemblies Based on Host/Guest Interactions Between Modified Dextrans. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/masy.201100080] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
17
|
Wintgens V, Layre AM, Hourdet D, Amiel C. Cyclodextrin Polymer Nanoassemblies: Strategies for Stability Improvement. Biomacromolecules 2012; 13:528-34. [DOI: 10.1021/bm201608n] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Véronique Wintgens
- Systèmes Polymères Complexes, ICMPE (UMR 7182 CNRS-UPEC),
2 rue Henri Dunant, 94320 Thiais, France
| | - Anne-Magali Layre
- Soft Matter Science and Engineering (UMR 7615 UPMC−CNRS-ESPCI), ESCPI,
10 rue Vauquelin, 75231 Paris Cedex 05, France
| | - Dominique Hourdet
- Soft Matter Science and Engineering (UMR 7615 UPMC−CNRS-ESPCI), ESCPI,
10 rue Vauquelin, 75231 Paris Cedex 05, France
| | - Catherine Amiel
- Systèmes Polymères Complexes, ICMPE (UMR 7182 CNRS-UPEC),
2 rue Henri Dunant, 94320 Thiais, France
| |
Collapse
|
18
|
Facile preparation of two tetrols from permethylated α-cyclodextrin and unambiguous NMR analysis. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.07.137] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
19
|
Wintgens V, Nielsen TT, Larsen KL, Amiel C. Size-controlled nanoassemblies based on cyclodextrin-modified dextrans. Macromol Biosci 2011; 11:1254-63. [PMID: 21728236 DOI: 10.1002/mabi.201100097] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2011] [Revised: 04/21/2011] [Indexed: 11/12/2022]
Abstract
Nanoassemblies formed by host/guest interactions between two polymers in aqueous media are studied. Two types of polymers with the same dextran backbone are modified with adamantyl or βCD groups. The sizes of the spontaneously formed nanoassemblies depend on the βCD:Ada ratio and on the total concentration and composition of the mixtures. The results can be rationalized by assuming a core/shell structure of the nanoassemblies, the core resulting from associative phase separation of the two polymers and being stabilized by an external shell made of Ada-grafted dextran and containing ions adsorbed from the solution. Hydrophobic compounds such as benzophenone can be incorporated efficiently without inducing changes in properties of the nanoassemblies.
Collapse
Affiliation(s)
- Véronique Wintgens
- Systèmes Polymères Complexes, ICMPE-CNRS, 2 rue Henri Dunant, 94320 Thiais, France
| | | | | | | |
Collapse
|