1
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Aguilar NM, Perez-Aguilar JM, González-Coronel VJ, Martínez-Gutiérrez H, Zayas Pérez T, González-Vergara E, Sanchez-Gaytan BL, Soriano-Moro G. Reversible Thermo-Optical Response Nanocomposites Based on RAFT Symmetric Triblock Copolymers (ABA) of Acrylamide and N-Isopropylacrylamide and Gold Nanoparticles. Polymers (Basel) 2023; 15:polym15081963. [PMID: 37112110 PMCID: PMC10144036 DOI: 10.3390/polym15081963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 04/02/2023] [Accepted: 04/07/2023] [Indexed: 04/29/2023] Open
Abstract
The development of composite materials with thermo-optical properties based on smart polymeric systems and nanostructures have been extensively studied. Due to the fact of its ability to self-assemble into a structure that generates a significant change in the refractive index, one of most attractive thermo-responsive polymers is poly(N-isopropylacrylamide) (PNIPAM), as well as its derivatives such as multiblock copolymers. In this work, symmetric triblock copolymers of polyacrylamide (PAM) and PNIPAM (PAMx-b-PNIPAMy-b-PAMx) with different block lengths were prepared by reversible addition-fragmentation chain-transfer polymerization (RAFT). The ABA sequence of these triblock copolymers was obtained in only two steps using a symmetrical trithiocarbonate as a transfer agent. The copolymers were combined with gold nanoparticles (AuNPs) to prepare nanocomposite materials with tunable optical properties. The results show that copolymers behave differently in solution due to the fact of variations in their composition. Therefore, they have a different impact on the nanoparticle formation process. Likewise, as expected, an increase in the length of the PNIPAM block promotes a better thermo-optical response.
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Affiliation(s)
- Nery M Aguilar
- Chemistry Center, Science Institute, Meritorious Autonomous University of Puebla (BUAP), University City, Puebla 72570, Mexico
| | - Jose Manuel Perez-Aguilar
- School of Chemical Sciences, Meritorious Autonomous University of Puebla (BUAP), University City, Puebla 72570, Mexico
| | - Valeria J González-Coronel
- School of Chemical Engineering, Meritorious Autonomous University of Puebla (BUAP), University City, Puebla 72570, Mexico
| | - Hugo Martínez-Gutiérrez
- National Polytechnic Institute (IPN), Center for Nanosciences and Micro and Nanotechnologies, Luis Enrique Erro, Mexico City 07738, Mexico
| | - Teresa Zayas Pérez
- Chemistry Center, Science Institute, Meritorious Autonomous University of Puebla (BUAP), University City, Puebla 72570, Mexico
| | - Enrique González-Vergara
- Chemistry Center, Science Institute, Meritorious Autonomous University of Puebla (BUAP), University City, Puebla 72570, Mexico
| | - Brenda L Sanchez-Gaytan
- Chemistry Center, Science Institute, Meritorious Autonomous University of Puebla (BUAP), University City, Puebla 72570, Mexico
| | - Guillermo Soriano-Moro
- Chemistry Center, Science Institute, Meritorious Autonomous University of Puebla (BUAP), University City, Puebla 72570, Mexico
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2
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Shu W, Wang Y, Zhang X, Li C, Le H, Chang F. Functional Hydrogel Dressings for Treatment of Burn Wounds. Front Bioeng Biotechnol 2021; 9:788461. [PMID: 34938723 PMCID: PMC8685951 DOI: 10.3389/fbioe.2021.788461] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Accepted: 11/11/2021] [Indexed: 12/18/2022] Open
Abstract
The therapy of burns is a challenging clinical issue. Burns are long-term injuries, and numerous patients suffer from chronic pain. Burn treatment includes management, infection control, wound debridement and escharotomy, dressing coverage, skin transplantation, and the use of skin substitutes. The future of advanced care of burn wounds lies in the development of “active dressings”. Hydrogel dressings have been employed universally to accelerate wound healing based on their unique properties to overcome the limitations of existing treatment methods. This review briefly introduces the advantages of hydrogel dressings and discusses the development of new hydrogel dressings for wound healing along with skin regeneration. Further, the treatment strategies for burns, ranging from external to clinical, are reviewed, and the functional classifications of hydrogel dressings along with their clinical value for burns are discussed.
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Affiliation(s)
- Wentao Shu
- Department of Biobank, Division of Clinical Research, The First Hospital of Jilin University, Changchun, China
| | - Yinan Wang
- Department of Biobank, Division of Clinical Research, The First Hospital of Jilin University, Changchun, China.,Key Laboratory of Organ Regeneration and Transplantation of the Ministry of Education, The First Hospital of Jilin University, Changchun, China
| | - Xi Zhang
- Department of Burn Surgery, The First Hospital of Jilin University, Changchun, China
| | - Chaoyang Li
- Department of Orthopedics, The Second Hospital of Jilin University, Changchun, China
| | - Hanxiang Le
- Department of Orthopedics, The Second Hospital of Jilin University, Changchun, China
| | - Fei Chang
- Department of Orthopedics, The Second Hospital of Jilin University, Changchun, China
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3
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Haddow PJ, da Silva MA, Kaldybekov DB, Dreiss CA, Hoffman E, Hutter V, Khutoryanskiy VV, Kirton SB, Mahmoudi N, McAuley WJ, Cook MT. Polymer Architecture Effects on Poly(N,N-Diethyl Acrylamide)-b-Poly(Ethylene Glycol)-b-Poly(N,N-Diethyl Acrylamide) Thermoreversible Gels and Their Evaluation as a Healthcare Material. Macromol Biosci 2021; 22:e2100432. [PMID: 34859566 DOI: 10.1002/mabi.202100432] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2021] [Revised: 11/25/2021] [Indexed: 10/19/2022]
Abstract
Thermoreversible gels which transition between liquid-like and solid-like states when warmed have enabled significant novel healthcare technologies. Poly(N,N-diethyl acrylamide) (PDEA) is a thermoresponsive polymer which can be used as a trigger to form thermoreversible gels, however its use in these materials is limited and crucial design principles are unknown. Herein ABA copolymers with the structure PDEA-b-poly(ethylene glycol) (PEG)-b-PDEA are synthesized to give four block copolymers with varied molecular weight of PDEA and PEG blocks. Rheometry on solutions of the block copolymers reveals that high molecular weight PEG blocks are required to form thermoreversible gels with predominantly solid-like behavior. Furthermore, small-angle X-ray scattering elucidates clear differences in the nanostructure of the copolymer library which can be linked to distinct rheological behaviors. A thermoreversible gel formulation based on PDEA (20 kDa)-b-PEG (10 kDa)-b-PDEA (20 kDa) is designed by optimizing the polymer concentration and ionic strength. It is found that the gel is mucoadhesive, stable, and non-toxic, as well as giving controlled release of a hydrophobic drug. Overall, this study provides insight into the effect of polymer architecture on the nanostructure and rheology of PDEA-b-PEG-b-PDEA and presents the development of a highly functional thermoreversible gel with high promise for healthcare applications.
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Affiliation(s)
- Peter J Haddow
- Research Centre in Topical Drug Delivery and Toxicology, School of Life and Medical Sciences, University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB, UK
| | - Marcelo A da Silva
- Research Centre in Topical Drug Delivery and Toxicology, School of Life and Medical Sciences, University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB, UK
| | - Daulet B Kaldybekov
- School of Chemistry, Food and Pharmacy, University of Reading, Reading, Berkshire, RG6 6UR, UK.,Department of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
| | - Cecile A Dreiss
- Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London, SE1 9NH, UK
| | - Ewelina Hoffman
- Research Centre in Topical Drug Delivery and Toxicology, School of Life and Medical Sciences, University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB, UK
| | - Victoria Hutter
- Research Centre in Topical Drug Delivery and Toxicology, School of Life and Medical Sciences, University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB, UK
| | - Vitaliy V Khutoryanskiy
- School of Chemistry, Food and Pharmacy, University of Reading, Reading, Berkshire, RG6 6UR, UK.,Department of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
| | - Stewart B Kirton
- Research Centre in Topical Drug Delivery and Toxicology, School of Life and Medical Sciences, University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB, UK
| | - Najet Mahmoudi
- ISIS Neutron and Muon Source, STFC, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - William J McAuley
- Research Centre in Topical Drug Delivery and Toxicology, School of Life and Medical Sciences, University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB, UK
| | - Michael T Cook
- Research Centre in Topical Drug Delivery and Toxicology, School of Life and Medical Sciences, University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB, UK
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4
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Stănescu PO, Radu IC, Drăghici C, Teodorescu M. Controlling the thermal response of poly(N-isopropylacrylamide)-poly(ethylene glycol)- poly(N-isopropylacrylamide) triblock copolymers in aqueous solution by means of additives. REACT FUNCT POLYM 2020. [DOI: 10.1016/j.reactfunctpolym.2020.104610] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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5
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Francesko A, Petkova P, Tzanov T. Hydrogel Dressings for Advanced Wound Management. Curr Med Chem 2019; 25:5782-5797. [PMID: 28933299 DOI: 10.2174/0929867324666170920161246] [Citation(s) in RCA: 134] [Impact Index Per Article: 26.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 12/08/2017] [Accepted: 08/25/2017] [Indexed: 12/12/2022]
Abstract
BACKGROUND Composed in a large extent of water and due to their nonadhesiveness, hydrogels found their way to the wound dressing market as materials that provide a moisture environment for healing while being comfortable to the patient. Hydrogels' exploitation is constantly increasing after evidences of their even broader therapeutic potential due to resemblance to dermal tissue and ability to induce partial skin regeneration. The innovation in advanced wound care is further directed to the development of so-called active dressings, where hydrogels are combined with components that enhance the primary purpose of providing a beneficial environment for wound healing. OBJECTIVE The objective of this review is to concisely describe the relevance of hydrogel dressings as platforms for delivery of active molecules for improved management of difficult- to-treat wounds. The emphasis is on the most recent advances in development of stimuli- responsive hydrogels, which allow for control over wound healing efficiency in response to different external modalities. Novel strategies for monitoring of the wound status and healing progress based on incorporation of sensor molecules into the hydrogel platforms are also discussed.
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Affiliation(s)
| | - Petya Petkova
- Grup de Biotecnologia Molecular i Industrial, Department of Chemical Engineering, Universitat Politècnica de Catalunya, Terrassa, Spain
| | - Tzanko Tzanov
- Grup de Biotecnologia Molecular i Industrial, Department of Chemical Engineering, Universitat Politècnica de Catalunya, Terrassa, Spain
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6
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Es Sayed J, Lorthioir C, Perrin P, Sanson N. PEGylated NiPAM microgels: synthesis, characterization and colloidal stability. SOFT MATTER 2019; 15:963-972. [PMID: 30652180 DOI: 10.1039/c8sm02156b] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The objective of this work is to synthesize highly stable thermoresponsive microgels that could be used in diverse applications. To achieve this, N-isopropylacrylamide (NiPAM) based microgels were first synthesized by surfactant-free precipitation polymerization of NiPAM in the presence of poly(ethylene glycol)methacrylate (PEG) as a macro-comonomer and methylenebisacrylamide (MBA) as a chemical crosslinker. By combining a complete set of techniques such as dynamic light scattering (DLS), scanning electron microscopy (SEM), zetametry, 1H NMR and micro-differential scanning calorimetry (μDSC), we clearly demonstrate that (i) the incorporation of the PEG chains controls the size and the polydispersity of the NiPAM-based microgels, whereas the thermal behavior in solution (enthalpy, volume phase transition temperature (VPTT)) remains almost the same as for pure NiPAM microgels; (ii) the PEG chains are mainly located on the microgel periphery; and (iii) the presence of the PEG chains strongly increases the colloidal stability of microgels in electrolyte solutions at high temperatures.
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Affiliation(s)
- Julien Es Sayed
- Soft Matter Sciences and Engineering, ESPCI Paris, PSL University, Sorbonne Université, CNRS, F-75005 Paris, France.
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7
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Fellin CR, Adelmund SM, Karis DG, Shafranek RT, Ono RJ, Martin CG, Johnston TG, DeForest CA, Nelson A. Tunable temperature‐ and shear‐responsive hydrogels based on poly(alkyl glycidyl ether)s. POLYM INT 2018. [DOI: 10.1002/pi.5716] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
| | - Steven M Adelmund
- Department of Chemical Engineering University of Washington Seattle WA USA
| | - Dylan G Karis
- Department of Chemistry University of Washington Seattle WA USA
| | | | - Robert J Ono
- Department of Chemistry University of Washington Seattle WA USA
| | | | | | - Cole A DeForest
- Department of Chemical Engineering University of Washington Seattle WA USA
| | - Alshakim Nelson
- Department of Chemistry University of Washington Seattle WA USA
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8
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Filippov AD, van Hees IA, Fokkink R, Voets IK, Kamperman M. Rapid and Quantitative De- tert-butylation for Poly(acrylic acid) Block Copolymers and Influence on Relaxation of Thermoassociated Transient Networks. Macromolecules 2018; 51:8316-8323. [PMID: 30405273 PMCID: PMC6202630 DOI: 10.1021/acs.macromol.8b01440] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 09/19/2018] [Indexed: 01/24/2023]
Abstract
![]()
The
synthesis of charged polymers often requires the polymerization
of protected monomers, followed by a polymer-analogous reaction to
the polyelectrolyte product. We present a mild, facile method to cleave tert-butyl groups from poly(tert-butyl
acrylate) blocks that yields poly(acrylic acid) (pAA) blocks free
of traces of the ester. The reaction utilizes a slight excess of HCl
in hexafluoroisopropanol (HFIP) at room temperature and runs
to completion within 4 h. We compare deprotection in HFIP with the
common TFA/DCM method and show that the latter does not yield clean
pAA. We show the effect of complete tert-butyl cleavage
on a ABA triblock copolymer, where poly(N-isopropylacrylamide)
(pNIPAM) is A and pAA is B, by means of viscosimetry, DLS, and SAXS
on solutions above overlap. The pNIPAM blocks dehydrate, and their
increased self-affinity above the lower critical solution temperature
(LCST) results in network formation by the triblocks. This manifests
itself as an increase in viscosity and a slowing down of the first-order
correlation function in light scattering. However, this stickering
effect manifests itself exclusively when the pAA block is tert-butyl-free. Additionally, SAXS shows that the conformational
properties of tert-butyl-free pAA copolymers are
markedly different from those with residual esters. Thus, we illustrate
a surprising effect of hydrophobic impurities that act across blocks
and assert the usefulness of HCl/HFIP in pAA synthesis.
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Affiliation(s)
- Alexei D Filippov
- Laboratory of Physical Chemistry and Soft Matter, Wageningen University & Research, Stippeneng 4, 6708WE Wageningen, The Netherlands
| | - Ilse A van Hees
- Laboratory of Physical Chemistry and Soft Matter, Wageningen University & Research, Stippeneng 4, 6708WE Wageningen, The Netherlands
| | - Remco Fokkink
- Laboratory of Physical Chemistry and Soft Matter, Wageningen University & Research, Stippeneng 4, 6708WE Wageningen, The Netherlands
| | - Ilja K Voets
- Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Marleen Kamperman
- Laboratory of Physical Chemistry and Soft Matter, Wageningen University & Research, Stippeneng 4, 6708WE Wageningen, The Netherlands.,Zernike Institute of Advanced Materials, University of Groningen, 9747 AG Groningen, The Netherlands
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9
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Andrei M, Stǎnescu PO, Drǎghici C, Teodorescu M. Degradable thermosensitive injectable hydrogels with two-phase composite structure from aqueous solutions of poly(N-isopropylacrylamide-co-5,6-benzo-2-methylene-1,3-dioxepane)—poly(ethylene glycol) triblock copolymers and biopolymers. Colloid Polym Sci 2017. [DOI: 10.1007/s00396-017-4161-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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10
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Filippov SK, Bogomolova A, Kaberov L, Velychkivska N, Starovoytova L, Cernochova Z, Rogers SE, Lau WM, Khutoryanskiy VV, Cook MT. Internal Nanoparticle Structure of Temperature-Responsive Self-Assembled PNIPAM-b-PEG-b-PNIPAM Triblock Copolymers in Aqueous Solutions: NMR, SANS, and Light Scattering Studies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:5314-5323. [PMID: 27159129 DOI: 10.1021/acs.langmuir.6b00284] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this study, we report detailed information on the internal structure of PNIPAM-b-PEG-b-PNIPAM nanoparticles formed from self-assembly in aqueous solutions upon increase in temperature. NMR spectroscopy, light scattering, and small-angle neutron scattering (SANS) were used to monitor different stages of nanoparticle formation as a function of temperature, providing insight into the fundamental processes involved. The presence of PEG in a copolymer structure significantly affects the formation of nanoparticles, making their transition to occur over a broader temperature range. The crucial parameter that controls the transition is the ratio of PEG/PNIPAM. For pure PNIPAM, the transition is sharp; the higher the PEG/PNIPAM ratio results in a broader transition. This behavior is explained by different mechanisms of PNIPAM block incorporation during nanoparticle formation at different PEG/PNIPAM ratios. Contrast variation experiments using SANS show that the structure of nanoparticles above cloud point temperatures for PNIPAM-b-PEG-b-PNIPAM copolymers is drastically different from the structure of PNIPAM mesoglobules. In contrast with pure PNIPAM mesoglobules, where solidlike particles and chain network with a mesh size of 1-3 nm are present, nanoparticles formed from PNIPAM-b-PEG-b-PNIPAM copolymers have nonuniform structure with "frozen" areas interconnected by single chains in Gaussian conformation. SANS data with deuterated "invisible" PEG blocks imply that PEG is uniformly distributed inside of a nanoparticle. It is kinetically flexible PEG blocks which affect the nanoparticle formation by prevention of PNIPAM microphase separation.
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Affiliation(s)
- Sergey K Filippov
- Institute of Macromolecular Chemistry , AS CR, Heyrovsky Sq. 2, Prague, Prague 6, 162 06, Czech Republic
| | - Anna Bogomolova
- Institute of Macromolecular Chemistry , AS CR, Heyrovsky Sq. 2, Prague, Prague 6, 162 06, Czech Republic
| | - Leonid Kaberov
- Institute of Macromolecular Chemistry , AS CR, Heyrovsky Sq. 2, Prague, Prague 6, 162 06, Czech Republic
| | - Nadiia Velychkivska
- Institute of Macromolecular Chemistry , AS CR, Heyrovsky Sq. 2, Prague, Prague 6, 162 06, Czech Republic
| | - Larisa Starovoytova
- Institute of Macromolecular Chemistry , AS CR, Heyrovsky Sq. 2, Prague, Prague 6, 162 06, Czech Republic
| | - Zulfiya Cernochova
- Institute of Macromolecular Chemistry , AS CR, Heyrovsky Sq. 2, Prague, Prague 6, 162 06, Czech Republic
| | - Sarah E Rogers
- ISIS-STFC, Rutherford Appleton Laboratory, Chilton, OX11 0QX Oxon United Kingdom
| | - Wing Man Lau
- School of Pharmacy, University of Reading, Whiteknights , PO Box 224, Reading, RG6 6AD Berkshire, United Kingdom
| | - Vitaliy V Khutoryanskiy
- School of Pharmacy, University of Reading, Whiteknights , PO Box 224, Reading, RG6 6AD Berkshire, United Kingdom
| | - Michael T Cook
- Department of Pharmacy & Research Centre in Topical Drug Delivery and Toxicology, University of Hertfordshire , Hatfield, AL10 9AB Hertfordshire, United Kingdom
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11
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Effect of Isotacticity of Linear Poly(N-isopropylacrylamide) on its Gelation in Benzyl Alcohol. J CHEM SCI 2016. [DOI: 10.1007/s12039-016-1086-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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12
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Turturicǎ G, Andrei M, Stǎnescu PO, Drǎghici C, Vuluga DM, Zaharia A, Sârbu A, Teodorescu M. ABA triblock copolymers of poly(N-isopropylacrylamide-co-5,6-benzo-2-methylene -1,3-dioxepane) (A) and poly(ethylene glycol) (B): synthesis and thermogelation and degradation properties in aqueous solutions. Colloid Polym Sci 2016. [DOI: 10.1007/s00396-016-3831-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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13
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Teodorescu M, Andrei M, Turturicǎ G, Stǎnescu PO, Zaharia A, Sârbu A. Novel Thermoreversible Injectable Hydrogel Formulations Based on Sodium Alginate and Poly(N-Isopropylacrylamide). INT J POLYM MATER PO 2015. [DOI: 10.1080/00914037.2015.1030646] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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14
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Ioan L, Teodorescu M, Stǎnescu PO, Drăghici C, Zaharia A, Sârbu A, Stoleriu S. The Effect of Hydrophilic Bentonite Nanoclay on the Thermogelation Properties of Poly(N-isopropylacrylamide)-poly(ethylene glycol)-poly(N-isopropylacrylamide) Triblock Copolymer Aqueous Solutions. J MACROMOL SCI B 2015. [DOI: 10.1080/00222348.2015.1010419] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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15
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Boere KWM, Soliman BG, Rijkers DTS, Hennink WE, Vermonden T. Thermoresponsive Injectable Hydrogels Cross-Linked by Native Chemical Ligation. Macromolecules 2014. [DOI: 10.1021/ma5000927] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Kristel W. M. Boere
- Department
of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS),
Faculty of Science, Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands
| | - Bram G. Soliman
- Department
of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS),
Faculty of Science, Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands
| | - Dirk T. S. Rijkers
- Medicinal Chemistry & Chemical Biology, Utrecht Institute for Pharmaceutical Sciences (UIPS), Faculty of Science, Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands
| | - Wim E. Hennink
- Department
of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS),
Faculty of Science, Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands
| | - Tina Vermonden
- Department
of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS),
Faculty of Science, Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands
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16
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Anghelache A, Teodorescu M, Stǎnescu PO, Drǎghici C, Vuluga DM. Novel crosslinked thermoresponsive hydrogels with controlled poly(ethylene glycol)—poly(propylene glycol) multiblock copolymer structure. Colloid Polym Sci 2013. [DOI: 10.1007/s00396-013-3128-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Poly(N-isopropylacrylamide-co-N-t-butylacrylamide)-block-poly(ethylene glycol)-block-poly(N-isopropylacrylamide-co-N-t-butylacrylamide) triblock copolymers: synthesis and thermogelation properties of aqueous solutions. Colloid Polym Sci 2013. [DOI: 10.1007/s00396-013-2994-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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18
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Chen J, Liu M, Gong H, Cui G, Lü S, Gao C, Huang F, Chen T, Zhang X, Liu Z. Synthesis of linear amphiphilic tetrablock quaterpolymers with dual stimulus response through the combination of ATRP and RAFT by a click chemistry site transformation approach. Polym Chem 2013. [DOI: 10.1039/c2py20946b] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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19
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de Graaf AJ, Azevedo Próspero dos Santos II, Pieters EH, Rijkers DT, van Nostrum CF, Vermonden T, Kok RJ, Hennink WE, Mastrobattista E. A micelle-shedding thermosensitive hydrogel as sustained release formulation. J Control Release 2012; 162:582-90. [DOI: 10.1016/j.jconrel.2012.08.010] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Revised: 08/03/2012] [Accepted: 08/05/2012] [Indexed: 10/28/2022]
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20
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Zheng Y, Zheng S. Poly(ethylene oxide)-grafted poly(N-isopropylacrylamide) networks: Preparation, characterization and rapid deswelling and reswelling behavior of hydrogels. REACT FUNCT POLYM 2012. [DOI: 10.1016/j.reactfunctpolym.2011.12.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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21
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de Graaf AJ, Mastrobattista E, Vermonden T, van Nostrum CF, Rijkers DTS, Liskamp RMJ, Hennink WE. Thermosensitive Peptide-Hybrid ABC Block Copolymers Obtained by ATRP: Synthesis, Self-Assembly, and Enzymatic Degradation. Macromolecules 2012. [DOI: 10.1021/ma2024667] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Albert J. de Graaf
- Utrecht Institute for Pharmaceutical
Sciences, Pharmaceutics, Utrecht University, P.O. Box 80.082, 3508TB Utrecht, The Netherlands
| | - Enrico Mastrobattista
- Utrecht Institute for Pharmaceutical
Sciences, Pharmaceutics, Utrecht University, P.O. Box 80.082, 3508TB Utrecht, The Netherlands
| | - Tina Vermonden
- Utrecht Institute for Pharmaceutical
Sciences, Pharmaceutics, Utrecht University, P.O. Box 80.082, 3508TB Utrecht, The Netherlands
| | - Cornelus F. van Nostrum
- Utrecht Institute for Pharmaceutical
Sciences, Pharmaceutics, Utrecht University, P.O. Box 80.082, 3508TB Utrecht, The Netherlands
| | - Dirk T. S. Rijkers
- Utrecht Institute for Pharmaceutical Sciences, Medicinal Chemistry & Chemical Biology, Utrecht University, P.O. Box 80.082, 3508TB Utrecht, The Netherlands
| | - Rob M. J. Liskamp
- Utrecht Institute for Pharmaceutical Sciences, Medicinal Chemistry & Chemical Biology, Utrecht University, P.O. Box 80.082, 3508TB Utrecht, The Netherlands
| | - Wim E. Hennink
- Utrecht Institute for Pharmaceutical
Sciences, Pharmaceutics, Utrecht University, P.O. Box 80.082, 3508TB Utrecht, The Netherlands
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de Graaf AJ, Boere KWM, Kemmink J, Fokkink RG, van Nostrum CF, Rijkers DTS, van der Gucht J, Wienk H, Baldus M, Mastrobattista E, Vermonden T, Hennink WE. Looped structure of flowerlike micelles revealed by 1H NMR relaxometry and light scattering. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:9843-9848. [PMID: 21755924 DOI: 10.1021/la2019605] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We present experimental proof that so-called "flowerlike micelles" exist and that they have some distinctly different properties compared to their "starlike" counterparts. Amphiphilic AB diblock and BAB triblock copolymers consisting of poly(ethylene glycol) (PEG) as hydrophilic A block and thermosensitive poly(N-isopropylacrylamide) (pNIPAm) B block(s) were synthesized via atom transfer radical polymerization (ATRP). In aqueous solutions, both block copolymer types form micelles above the cloud point of pNIPAm. Static and dynamic light scattering measurements in combination with NMR relaxation experiments proved the existence of flowerlike micelles based on pNIPAm(16kDa)-PEG(4kDa)-pNIPAm(16kDa) which had a smaller radius and lower mass and aggregation number than starlike micelles based on mPEG(2kDa)-pNIPAm(16kDa). Furthermore, the PEG surface density was much lower for the flowerlike micelles, which we attribute to the looped configuration of the hydrophilic PEG block. (1)H NMR relaxation measurements showed biphasic T(2) relaxation for PEG, indicating rigid PEG segments close to the micelle core and more flexible distal segments. Even the flexible distal segments were shown to have a lower mobility in the flowerlike micelles compared to the starlike micelles, indicating strain due to loop formation. Taken together, it is demonstrated that self-assemblies of BAB triblock copolymers have their hydrophilic block in a looped conformation and thus indeed adopt a flowerlike conformation.
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Affiliation(s)
- Albert J de Graaf
- Utrecht Institute for Pharmaceutical Sciences, Pharmaceutics, Utrecht University, P.O. Box 80.082, 3508TB Utrecht, The Netherlands
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Influence of indomethacin-loading on the micellization and drug release of thermosensitive dextran-graft-poly(N-isopropylacrylamide). REACT FUNCT POLYM 2011. [DOI: 10.1016/j.reactfunctpolym.2011.05.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Synthesis and self-assembly of a hydrophilic, thermo-responsive poly(ethylene oxide) monomethyl ether-block-poly(acrylic acid)-block-poly(N-isopropylacrylamide) copolymer to form micelles for drug delivery. REACT FUNCT POLYM 2011. [DOI: 10.1016/j.reactfunctpolym.2011.02.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Teodorescu M, Negru I, Stanescu PO, Drăghici C, Lungu A, Sârbu A. A2BA2Block Copolymers of Poly(N-isopropylacrylamide) (A) and Poly(ethylene glycol) (B): Synthesis and Thermal Gelation Properties of Aqueous Solutions. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2010. [DOI: 10.1080/10601325.2011.537542] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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