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Diaconu AD, Logigan CL, Peptu CA, Ibanescu C, Harabagiu V, Peptu C. Polyurethane Degradable Hydrogels Based on Cyclodextrin-Oligocaprolactone Derivatives. Gels 2023; 9:755. [PMID: 37754436 PMCID: PMC10530861 DOI: 10.3390/gels9090755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 09/07/2023] [Accepted: 09/14/2023] [Indexed: 09/28/2023] Open
Abstract
Polymer networks based on cyclodextrin and polyethylene glycol were prepared through polyaddition crosslinking using isophorone diisocyanate. The envisaged material properties are the hydrophilic character, specific to PEG and cyclodextrins, and the capacity to encapsulate guest molecules in the cyclodextrin cavity through physical interactions. The cyclodextrin was custom-modified with oligocaprolactone to endow the crosslinked material with a hydrolytically degradable character. SEM, DTG, and FTIR characterization methods have confirmed the morphology and structure of the prepared hydrogels. The influence of the crosslinking reaction feed was investigated through dynamic rheology. Further, thermal water swelling and hydrolytic degradation in basic conditions revealed the connectivity of the polymer network and the particular influence of the cyclodextrin amount in the crosslinking reaction feed on the material properties. Also, levofloxacin was employed as a model drug to investigate the drug loading and release capacity of the prepared hydrogels.
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Affiliation(s)
- Alexandra-Diana Diaconu
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41A, 700487 Iasi, Romania; (A.-D.D.); (V.H.)
| | - Corina-Lenuta Logigan
- Department of Natural and Synthetic Polymers, Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 71, Prof. Dr. Docent Dimitrie Mangeron Street, 700050 Iasi, Romania; (C.-L.L.); (C.A.P.); (C.I.)
| | - Catalina Anisoara Peptu
- Department of Natural and Synthetic Polymers, Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 71, Prof. Dr. Docent Dimitrie Mangeron Street, 700050 Iasi, Romania; (C.-L.L.); (C.A.P.); (C.I.)
| | - Constanta Ibanescu
- Department of Natural and Synthetic Polymers, Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 71, Prof. Dr. Docent Dimitrie Mangeron Street, 700050 Iasi, Romania; (C.-L.L.); (C.A.P.); (C.I.)
| | - Valeria Harabagiu
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41A, 700487 Iasi, Romania; (A.-D.D.); (V.H.)
| | - Cristian Peptu
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41A, 700487 Iasi, Romania; (A.-D.D.); (V.H.)
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2
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Gualandi L, Franchi P, Mezzina E, Goldup SM, Lucarini M. Spin-labelled mechanically interlocked molecules as models for the interpretation of biradical EPR spectra. Chem Sci 2021; 12:8385-8393. [PMID: 34221319 PMCID: PMC8221063 DOI: 10.1039/d1sc01462e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Accepted: 05/14/2021] [Indexed: 12/20/2022] Open
Abstract
Biradical spin probes can provide detailed information about the distances between molecules/regions of molecules because the through-space coupling of radical centres, characterised by J, is strongly distance dependent. However, if the system can adopt multiple configurations, as is common in supramolecular complexes, the shape of the EPR spectrum is influenced not only by J but also the rate of exchange between different states. In practice, it is often hard to separate these variables and as a result, the effect of the latter is sometimes overlooked. To demonstrate this challenge unequivocally we synthesised rotaxane biradicals containing nitronyl nitroxide units at the termini of their axles. The rotaxanes exchange between the available biradical conformations more slowly than the corresponding non-interlocked axles but, despite this, in some cases, the EPR spectra of the axle and rotaxane remain remarkably similar. Detailed analysis allowed us to demonstrate that the similar EPR spectral shapes result from different combinations of J and rates of conformational interconversion, a phenomenon suggested theoretically more than 50 years ago. This work reinforces the idea that thorough analysis must be performed when interpreting the spectra of biradicals employed as spin probes in solution.
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Affiliation(s)
- Lorenzo Gualandi
- Department of Chemistry "Giacomo Ciamician", University of Bologna Via San Giacomo 11 Bologna Italy
| | - Paola Franchi
- Department of Chemistry "Giacomo Ciamician", University of Bologna Via San Giacomo 11 Bologna Italy
| | - Elisabetta Mezzina
- Department of Chemistry "Giacomo Ciamician", University of Bologna Via San Giacomo 11 Bologna Italy
| | - Stephen M Goldup
- Department of Chemistry, University of Southampton University Road, Highfield Southampton UK
| | - Marco Lucarini
- Department of Chemistry "Giacomo Ciamician", University of Bologna Via San Giacomo 11 Bologna Italy
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3
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Popescu EI, Aricov L, Mocanu S, Matei I, Hristea E, Baratoiu R, Leonties A, Petcu C, Alexandrescu E, Ionita G. Subtle influence on alginate gel properties through host–guest interactions between covalently appended cyclodextrin and adamantane units. NEW J CHEM 2021. [DOI: 10.1039/d1nj01278a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Host–guest interactions between functionalized alginate chains modulate the physico-chemical properties of alginate gels.
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Affiliation(s)
- Elena Irina Popescu
- Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Ludmila Aricov
- Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Sorin Mocanu
- Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Iulia Matei
- Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Elena Hristea
- Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Rodica Baratoiu
- Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Anca Leonties
- Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Cristian Petcu
- National Institute for Research & Development in Chemistry and Petrochemistry – ICECHIM Bucharest
- Bucharest 060021
- Romania
| | - Elvira Alexandrescu
- National Institute for Research & Development in Chemistry and Petrochemistry – ICECHIM Bucharest
- Bucharest 060021
- Romania
| | - Gabriela Ionita
- Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
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4
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Buta MC, Toader AM, Frecus B, Oprea CI, Cimpoesu F, Ionita G. Molecular and Supramolecular Interactions in Systems with Nitroxide-Based Radicals. Int J Mol Sci 2019; 20:ijms20194733. [PMID: 31554219 PMCID: PMC6801970 DOI: 10.3390/ijms20194733] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 09/19/2019] [Accepted: 09/20/2019] [Indexed: 12/25/2022] Open
Abstract
Nitroxide-based radicals, having the advantage of firm chemical stability, are usable as probes in the detection of nanoscale details in the chemical environment of various multi-component systems, based on subtle variations in their electron paramagnetic resonance spectra. We propose a systematic walk through the vast area of problems and inquires that are implied by the rationalization of solvent effects on the spectral parameters, by first-principle methods of structural chemistry. Our approach consists of using state-of-the-art procedures, like Density Functional Theory (DFT), on properly designed systems, kept at the border of idealization and chemical realism. Thus, we investigate the case of real solvent molecules intervening in different configurations between two radical molecules, in comparison with radicals taken in vacuum or having the solvent that is treated by surrogate models, such as polarization continuum approximation. In this work, we selected the dichloromethane as solvent and the prototype radicals abbreviated TEMPO ((2,2,6,6-Tetramethylpiperidin-1-yl) oxyl). In another branch of the work, we check the interaction of radicals with large toroidal molecules, β-cyclodextrin, and cucurbit[6]uril, modeling the interaction energy profile at encapsulation. The drawn synoptic view offers valuable rationales for understanding spectroscopy and energetics of nitroxide radicals in various environments, which are specific to soft chemistry.
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Affiliation(s)
- Maria Cristina Buta
- Institute of Physical Chemistry, Splaiul Independentei 202, 060021 Bucharest, Romania.
| | - Ana Maria Toader
- Institute of Physical Chemistry, Splaiul Independentei 202, 060021 Bucharest, Romania.
| | - Bogdan Frecus
- Institute of Physical Chemistry, Splaiul Independentei 202, 060021 Bucharest, Romania.
| | - Corneliu I Oprea
- Department of Physics, Ovidius University, 900527 Constanţa, Romania.
| | - Fanica Cimpoesu
- Institute of Physical Chemistry, Splaiul Independentei 202, 060021 Bucharest, Romania.
| | - Gabriela Ionita
- Institute of Physical Chemistry, Splaiul Independentei 202, 060021 Bucharest, Romania.
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5
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Mocanu S, Matei I, Leonties A, Tecuceanu V, Hanganu A, Minea Z, Stancu A, Popescu EI, Ionita G. New flexible molecular probes bearing dansyl and TEMPO moieties for host–guest interactions in solution and gels. NEW J CHEM 2019. [DOI: 10.1039/c9nj01554j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Host–guest interactions in functionalised alginate gels are evidenced by EPR and fluorescence spectra.
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Affiliation(s)
- Sorin Mocanu
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Iulia Matei
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Anca Leonties
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | | | - Anamaria Hanganu
- Organic Chemistry Centre of the Romanian Academy
- 78100 Bucharest
- Romania
- Department of Organic Chemistry, Biochemistry and Catalysis
- University of Bucharest
| | - Zamfirica Minea
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Alina Stancu
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Elena Irina Popescu
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
| | - Gabriela Ionita
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy
- Bucharest 060021
- Romania
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6
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Mocanu S, Matei I, Ionescu S, Tecuceanu V, Marinescu G, Ionita P, Culita D, Leonties A, Ionita G. Complexation of β-cyclodextrin with dual molecular probes bearing fluorescent and paramagnetic moieties linked by short polyether chains. Phys Chem Chem Phys 2018; 19:27839-27847. [PMID: 28990616 DOI: 10.1039/c7cp05276f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Electron paramagnetic resonance (EPR) and fluorescence spectroscopies provide molecular-level insights on the interaction of paramagnetic and fluorescent species with the microenvironment. A series of dual molecular probes bearing fluorescent and paramagnetic moieties linked by flexible short polyether chains have been synthesized. These new molecular probes open the possibility to investigate various multi-component systems such as host-guest systems, polymeric micelles, gels and protein solutions by using EPR and fluorescence spectroscopies concertedly. The EPR and fluorescence spectra of these compounds show that the dependence of the rotational correlation time and fluorescence quantum yield on the chain length of the linker is not linear, due to the flexibility of the polyether linker. The quenching effect of the nitroxide moiety on the fluorescence intensity of the pyrene group varies with the linker length and flexibility. The interaction of these dual molecular probes with β-cyclodextrin, in solution and in polymeric gels, was evaluated and demonstrated by analysis of EPR and fluorescence spectra.
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Affiliation(s)
- S Mocanu
- "Ilie Murgulescu" Institute of Physical Chemistry of the Romanian Academy, 202 Splaiul Independentei, Bucharest 060021, Romania.
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7
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Poly(ethylene glycol)/β-cyclodextrin covalent gel networks: host matrices for studying radical processes in plant extract–riboflavin systems following UV irradiation. CHEMICAL PAPERS 2016. [DOI: 10.1007/s11696-016-0047-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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8
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Abbas K, Boutier-Pischon A, Auger F, Françon D, Almario A, Frapart YM. In vivo triarylmethyl radical stabilization through encapsulation in Pluronic F-127 hydrogel. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2016; 270:147-156. [PMID: 27479038 DOI: 10.1016/j.jmr.2016.07.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 07/20/2016] [Accepted: 07/21/2016] [Indexed: 06/06/2023]
Abstract
In vivo electron paramagnetic resonance (EPR) imaging and spectroscopy are non-invasive technologies used to specifically detect and quantify paramagnetic species. However, the relative instability of spin probes such as triarylmethyl radicals limits their application to conduct oxygen quantification and mapping. In this study we encapsulated tetrathiatriarylmethyl radical (TAM; known as "Finland" probe) in Pluronic F-127 hydrogel (PF-127) in order to limit its degradation and evaluate its in vitro and in vivo EPR properties as a function of oxygen. Our results show that the EPR signal of encapsulated TAM in PF-127 hydrogel is similar to the one in solution. Although it is less sensitive to oxygen, it is suitable for oximetry. We also demonstrated that the incorporation of TAM in PF-127 hydrogel leads to an improved in vivo EPR stability of the radical under anesthesia. This new formulation enables high quality EPR imaging and oximetry and paves the way for the application of TAM radical-based probes in various biomedical fields.
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Affiliation(s)
- Kahina Abbas
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), FR3657 CICB, Université Paris Descartes, Sorbonne Paris Cité, 45 rue des Saints-Pères, 75006 Paris, France
| | - Audrey Boutier-Pischon
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), FR3657 CICB, Université Paris Descartes, Sorbonne Paris Cité, 45 rue des Saints-Pères, 75006 Paris, France
| | - Florian Auger
- Integrated Drug Discovery, Sanofi R&D, 1, Avenue Pierre-Brossolette, 91385 Chilly-Mazarin, France
| | - Dominique Françon
- Translational Science Unit, Sanofi R&D, 1, Avenue Pierre-Brossolette, 91385 Chilly-Mazarin, France
| | - Antonio Almario
- Integrated Drug Discovery, Sanofi R&D, 1, Avenue Pierre-Brossolette, 91385 Chilly-Mazarin, France
| | - Yves-Michel Frapart
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), FR3657 CICB, Université Paris Descartes, Sorbonne Paris Cité, 45 rue des Saints-Pères, 75006 Paris, France.
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9
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Zhang C, Peng H, Li W, Liu L, Puttick S, Reid J, Bernardi S, Searles DJ, Zhang A, Whittaker AK. Conformation Transitions of Thermoresponsive Dendronized Polymers across the Lower Critical Solution Temperature. Macromolecules 2016. [DOI: 10.1021/acs.macromol.5b02414] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cheng Zhang
- ARC
Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of Queensland, Brisbane, Qld 4072, Australia
| | - Hui Peng
- ARC
Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of Queensland, Brisbane, Qld 4072, Australia
| | - Wen Li
- Department
of Polymer Materials, Shanghai University, Shangda Street 99, Mailbox 152, Shanghai 200444, China
| | - Lianxiao Liu
- Department
of Polymer Materials, Shanghai University, Shangda Street 99, Mailbox 152, Shanghai 200444, China
| | - Simon Puttick
- ARC
Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of Queensland, Brisbane, Qld 4072, Australia
| | | | | | | | - Afang Zhang
- Department
of Polymer Materials, Shanghai University, Shangda Street 99, Mailbox 152, Shanghai 200444, China
| | - Andrew K. Whittaker
- ARC
Centre of Excellence in Convergent Bio-Nano Science and Technology, The University of Queensland, Brisbane, Qld 4072, Australia
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10
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Ionita G, Ariciu AM, Smith DK, Chechik V. Ion exchange in alginate gels--dynamic behaviour revealed by electron paramagnetic resonance. SOFT MATTER 2015; 11:8968-8974. [PMID: 26399427 DOI: 10.1039/c5sm02062j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The formation of alginate gel from low molecular weight alginate and very low molecular weight alginate in the presence of divalent cations was investigated using Electron Paramagnetic Resonance (EPR) spectroscopy. The transition from sol to gel in the presence of divalent cations was monitored by the changes in the dynamics of spin labelled alginate. The immobilisation of the spin labelled alginate in the gel reflects the strength of interaction between the cation and alginate chain. Diffusion experiments showed that both the cation and alginate polyanion in the gel fibres can exchange with molecules in solution. In particular, we showed that dissolved alginate polyanions can replace alginates in the gel fibres, which can hence diffuse through the bulk of the gel. This illustrates the surprisingly highly dynamic nature of these gels and opens up the possibility of preparing multicomponent alginate gels via polyanion exchange process.
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Affiliation(s)
- Gabriela Ionita
- Romanian Academy, Institute of Physical Chemistry "Ilie Murgulescu", 202 Splaiul Independentei, Bucharest, 060021, Romania.
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11
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Mezzina E, Manoni R, Romano F, Lucarini M. Spin-Labelling of Host-Guest Assemblies with Nitroxide Radicals. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201402286] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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12
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Caglieris F, Melone L, Canepa F, Lamura G, Castiglione F, Ferro M, Malpezzi L, Mele A, Punta C, Franchi P, Lucarini M, Rossi B, Trotta F. Effective magnetic moment in cyclodextrin–polynitroxides: potential supramolecular vectors for magnetic resonance imaging. RSC Adv 2015. [DOI: 10.1039/c5ra14597j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Hepta-TEMPO β-CD has a molecular effective magnetic moment of 4.2 μB that is responsible of a NMR relaxivity up to 1.60 mm−1 s−1, not far from the values reported for Gd-based contrast agents, thus resulting a promising candidates as non-toxic MRI contrast agents.
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13
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Bardelang D, Casano G, Poulhès F, Karoui H, Filippini J, Rockenbauer A, Rosas R, Monnier V, Siri D, Gaudel-Siri A, Ouari O, Tordo P. Spin Exchange Monitoring of the Strong Positive Homotropic Allosteric Binding of a Tetraradical by a Synthetic Receptor in Water. J Am Chem Soc 2014; 136:17570-7. [DOI: 10.1021/ja509586k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- David Bardelang
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Gilles Casano
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Florent Poulhès
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Hakim Karoui
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Jessica Filippini
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Antal Rockenbauer
- Department of Physics, Budapest University of Technology and Economics and MTA-BME Condensed Matter Research Group, Budafoki ut 8, 1111 Budapest, Hungary
| | - Roselyne Rosas
- Aix-Marseille Université, CNRS, Spectropole, FR 1739, 13013 Marseille, France
| | - Valérie Monnier
- Aix-Marseille Université, CNRS, Spectropole, FR 1739, 13013 Marseille, France
| | - Didier Siri
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Anouk Gaudel-Siri
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Olivier Ouari
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Paul Tordo
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
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14
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Matei I, Ariciu AM, Neacsu MV, Collauto A, Salifoglou A, Ionita G. Cationic Spin Probe Reporting on Thermal Denaturation and Complexation–Decomplexation of BSA with SDS. Potential Applications in Protein Purification Processes. J Phys Chem B 2014; 118:11238-52. [DOI: 10.1021/jp5071055] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Iulia Matei
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy, 202 Splaiul
Independentei, Bucharest 060021, Romania
- Department
of Physical Chemistry, Faculty of Chemistry, University of Bucharest, Bd. Regina Elisabeta 4-12, Bucharest, Romania
| | - Ana Maria Ariciu
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy, 202 Splaiul
Independentei, Bucharest 060021, Romania
| | - Maria Victoria Neacsu
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy, 202 Splaiul
Independentei, Bucharest 060021, Romania
| | - Alberto Collauto
- Department
of Chemical Physics, Weizmann Institute of Science, 76100 Rehovot, Israel
| | - Athanasios Salifoglou
- Department
Chemical Engineering, Laboratory of Inorganic Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Gabriela Ionita
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy, 202 Splaiul
Independentei, Bucharest 060021, Romania
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15
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Ionita G, Ariciu AM, Turcu IM, Chechik V. Properties of polyethylene glycol/cyclodextrin hydrogels revealed by spin probes and spin labelling methods. SOFT MATTER 2014; 10:1778-1783. [PMID: 24651650 DOI: 10.1039/c3sm52004h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The properties of a gel consisting of a covalent network formed by the reaction of isocyanate end-capped polyethylene glycol (PEG) with β-cyclodextrin, were investigated by EPR spectroscopy. Spin-labelled cyclodextrin was incorporated into the cross-link points of the gel and at the chain ends. The dynamics of the gel fibres as reported by the spin label, was found to be sensitive to the H-bonding ability of the solvent, density of cross-links and temperature. Addition of spin probes (e.g., TEMPO and adamantane-TEMPO) to the unlabelled gel made it possible to characterise the solvent pools in the gel. While TEMPO was uniformly distributed throughout the solvent pools, the adamantane derivative was located at the gel fibre-solvent pool interface; these two probes thus reported on the different locations in the solvent pools. At low temperature, the gels were shown to prevent ice crystallisation in the solvent pools resulting in the formation of supercooled water. Both probes showed that the water froze at ca. 250 K, thus suggesting that the properties of the supercooled water are uniform across the solvent pools.
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Affiliation(s)
- Gabriela Ionita
- Romanian Academy, Institute of Physical Chemistry "Ilie Murgulescu", 202 Splaiul Independentei, Bycharest 060021, Romania.
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16
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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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17
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Jiang J, Yang L, Jin Q, Ma W, Moroder L, Dong S. Site-directed spin labeling of a collagen mimetic peptide. Chemistry 2013; 19:17679-82. [PMID: 24273074 DOI: 10.1002/chem.201303290] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Indexed: 11/11/2022]
Affiliation(s)
- Jianbing Jiang
- School of Life Sciences, Lanzhou University, 222 Tianshui South Road, Lanzhou 730000 (China)
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Ionita G, Marinescu G, Ilie C, Anghel DF, Smith DK, Chechik V. Sorption of metal ions by poly(ethylene glycol)/β-CD hydrogels leads to gel-embedded metal nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:9173-9178. [PMID: 23782340 DOI: 10.1021/la401541p] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Inorganic nanoparticles can be embedded within gels by selectively preloading them with suitable molecular precursors followed by reduction or another suitable reaction. Here, we exploit the selective sorption properties of cross-linked β-cyclodextrin/poly(ethylene glycol) hydrogels, in analogy with polyurethane foams, to preconcentrate metal salts (HAuCl4 and K2[Co(SCN)4]) and subsequently generate gel-embedded metal nanoparticles (10-50 nm). The nanoparticles are shown to be immobilized within the gel network as a consequence of their large dimensions in comparison to the gel network pore size. We suggest this is a useful approach for the generalized synthesis of hybrid soft-hard nanomaterials.
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Affiliation(s)
- Gabriela Ionita
- Ilie Murgulescu Institute of Physical Chemistry of the Romanian Academy, 202 Spl. Independentei, Bucharest, 060021, Romania
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Kurzbach D, Schömer M, Wilms VS, Frey H, Hinderberger D. How Structure-Related Collapse Mechanisms Determine Nanoscale Inhomogeneities in Thermoresponsive Polymers. Macromolecules 2012. [DOI: 10.1021/ma3014299] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Dennis Kurzbach
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz,
Germany
| | - Martina Schömer
- Department of Organic
Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14,
55128 Mainz, Germany
| | - Valerie S. Wilms
- Department of Organic
Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14,
55128 Mainz, Germany
- Graduate School “Materials Science in Mainz”, Staudingerweg 9, 55099 Mainz,
Germany
| | - Holger Frey
- Department of Organic
Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14,
55128 Mainz, Germany
| | - Dariush Hinderberger
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz,
Germany
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Andreis M, Carić D, Vujičić NŠ, Jokić M, Žinić M, Kveder M. Self-assembly of gelator molecules in liquid crystals studied by ESR. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2012.05.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Zhen Pan S, Xin Song L, Chen J, Yun Du F, Yang J, Xia J. Noncovalent interaction of polyethylene glycol with copper complex of ethylenediaminetetraacetic acid and its application in constructing inorganic nanomaterials. Dalton Trans 2011; 40:10117-24. [DOI: 10.1039/c1dt11090j] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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