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Khodeir M, Jia H, Antoun S, Friebe C, Schubert US, Lu Y, Van Ruymbeke E, Gohy J. Synthesis and characterization of hydrogels containing
redox‐responsive
2,2,6,6
‐
tetramethylpiperidinyloxy
methacrylate and
thermoresponsive
N
‐isopropylacrylamide
. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20200172] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Miriam Khodeir
- Institute of Condensed Matter and Nanosciences (IMCN), Bio and Soft Matter (BSMA) Université Catholique de Louvain (UCL) Louvain‐la‐Neuve Belgium
| | - He Jia
- Institute of Condensed Matter and Nanosciences (IMCN), Bio and Soft Matter (BSMA) Université Catholique de Louvain (UCL) Louvain‐la‐Neuve Belgium
| | - Sayed Antoun
- Department of Chemistry, Faculty of Science Section III ‐ North Campus‐Tripoli Lebanese University (UL) Lebanon
| | - Christian Friebe
- Laboratory of Organic and Macromolecular Chemistry (IOMC) Friedrich Schiller Universität Jena Jena Germany
| | - Ulrich S. Schubert
- Laboratory of Organic and Macromolecular Chemistry (IOMC) Friedrich Schiller Universität Jena Jena Germany
| | - Yan Lu
- EM‐IEES Institute for Electrochemical Energy Storage Helmholtz‐Zentrum Berlin für Materialien und Energie Berlin Germany
- Institute of Chemistry University of Potsdam Potsdam Germany
| | - Evelyne Van Ruymbeke
- Institute of Condensed Matter and Nanosciences (IMCN), Bio and Soft Matter (BSMA) Université Catholique de Louvain (UCL) Louvain‐la‐Neuve Belgium
| | - Jean‐François Gohy
- Institute of Condensed Matter and Nanosciences (IMCN), Bio and Soft Matter (BSMA) Université Catholique de Louvain (UCL) Louvain‐la‐Neuve Belgium
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3
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Abdelaty MSA. Poly( N-isopropylacrylamide- co-2-((diethylamino)methyl)-4-formyl-6-methoxyphenyl acrylate) Environmental Functional Copolymers: Synthesis, Characterizations, and Grafting with Amino Acids. Biomolecules 2018; 8:E138. [PMID: 30404234 PMCID: PMC6316684 DOI: 10.3390/biom8040138] [Citation(s) in RCA: 6] [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: 10/20/2018] [Revised: 10/29/2018] [Accepted: 10/30/2018] [Indexed: 11/29/2022] Open
Abstract
Vanillin was used to synthesize a new derivative with an active aldehyde group and response to pH. It is named 2-((diethylamino) methyl)-4-formyl-6-methoxyphenyl acrylate, abbreviated to DEAMVA. The chemical structures were evaluated by ¹H, 13C nuclear magnetic resonance (NMR), infrared (IR), and UV-Vis-spectroscopy, and all results demonstrated good statement. In order to achieve the dual responsive behavior thermo-pH with functionality, free radical polymerization of N-isopropylacrylamide with DEAMVA in different molar ratios (5, 10, 15 mol%) has been used, with azobisisobutyronitrile (AIBN) as the initiator. The chemical structure of the polymers was investigated by ¹H NMR and IR. The dual responsive functional copolymer was exposed to a grafted process with tryptophan and tyrosine, both of which were also evaluated by ¹HNMR and IR. Copolymers before and after grafting were physically investigated by size exclusion chromatography (SEC) for estimation of the molecular weight, the glass transition temperature by differential scanning calorimeter (DSC) and scanning electron microscope (SEM) for the surface morphology. The phase separation or lower critical solution temperature (LCST) (Tc) of the polymer solution was determined not only by a turbidity method using the change in the transmittance with temperature, but also by micro-DSC. The conversion to an amino acid-grafted polymer was detected through Beer's law for the absorption of the ⁻CH=N- imine group by UV-Vis-Spectroscopy.
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Affiliation(s)
- Momen S A Abdelaty
- Polymer and Biopolymer Lap, Department of Biology, Collage of Haql, Faculty of Science, University of Tabuk, Tabuk 71491, Saudi Arabia.
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4
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Fedorchak MV, Conner IP, Schuman JS, Cugini A, Little SR. Long Term Glaucoma Drug Delivery Using a Topically Retained Gel/Microsphere Eye Drop. Sci Rep 2017; 7:8639. [PMID: 28819134 PMCID: PMC5561248 DOI: 10.1038/s41598-017-09379-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Accepted: 07/25/2017] [Indexed: 11/29/2022] Open
Abstract
The purpose of this study was to characterize and determine the efficacy of a long-term, non-invasive gel/microsphere (GMS) eye drop for glaucoma. This novel drug delivery system is comprised of a thermoresponsive hydrogel carrier and drug-loaded polymer microspheres. In vitro release of brimonidine from the GMS drops and gel properties were quantified. A single brimonidine-loaded GMS drop was administered to 5 normotensive rabbits and intraocular pressure (IOP) was monitored for 28 days. Here we report that IOP reduction in rabbits receiving a single brimonidine GMS drop was comparable to that of rabbits receiving twice daily, standard brimonidine drops. GMS drops were retained in the inferior fornix in all animals for the length of the study. Our results suggest in vivo efficacy over 28 days from a single GMS drop and a potential decrease in systemic absorption, based on a lack of substantial IOP effects on the fellow untreated eye, compared to brimonidine twice-daily eye drops. To our knowledge, this represents the first long-term, drug-releasing depot that can be administered as a traditional eye drop.
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Affiliation(s)
- Morgan V Fedorchak
- UPMC Eye Center, Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, USA. .,The Louis J. Fox Center for Vision Restoration, University of Pittsburgh, Pittsburgh, PA, USA. .,Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, PA, USA. .,Department of Clinical and Translational Science, University of Pittsburgh, Pittsburgh, PA, USA. .,Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA. .,The McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA.
| | - Ian P Conner
- UPMC Eye Center, Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, USA.,The Louis J. Fox Center for Vision Restoration, University of Pittsburgh, Pittsburgh, PA, USA.,The McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Joel S Schuman
- UPMC Eye Center, Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, USA.,The Louis J. Fox Center for Vision Restoration, University of Pittsburgh, Pittsburgh, PA, USA.,Department of Clinical and Translational Science, University of Pittsburgh, Pittsburgh, PA, USA.,Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA.,The McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA.,Department of Ophthalmology, Langone Eye Center, NYU School of Medicine, New York, NY, USA.,Department of Neuroscience, NYU School of Medicine, New York, NY, USA.,Department of Physiology, NYU School of Medicine, New York, NY, USA.,Depatment of Electrical and Computer Engineering, NYU Tandon School of Engineering, New York, NY, USA
| | - Anthony Cugini
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
| | - Steven R Little
- UPMC Eye Center, Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, USA. .,Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, PA, USA. .,Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA. .,Department of Immunology, University of Pittsburgh, Pittsburgh, PA, USA. .,The McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA.
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5
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Sanz B, von Bilderling C, Tuninetti JS, Pietrasanta L, Mijangos C, Longo GS, Azzaroni O, Giussi JM. Thermally-induced softening of PNIPAm-based nanopillar arrays. SOFT MATTER 2017; 13:2453-2464. [PMID: 28287232 DOI: 10.1039/c7sm00206h] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The surface properties of soft nanostructured hydrogels are crucial in the design of responsive materials that can be used as platforms to create adaptive devices. The lower critical solution temperature (LCST) of thermo-responsive hydrogels such as poly(N-isopropylacrylamide) (PNIPAm) can be modified by introducing a hydrophilic monomer to create a wide range of thermo-responsive micro-/nano-structures in a large temperature range. Using surface initiation atom-transfer radical polymerization in synthesized anodized aluminum oxide templates, we designed, fabricated, and characterized thermo-responsive nanopillars based on PNIPAm hydrogels with tunable mechanical properties by incorporating acrylamide monomers (AAm). In addition to their LCST, the incorporation of a hydrophilic entity in the nanopillars based on PNIPAm has abruptly changed the topological and mechanical properties of our system. To gain an insight into the mechanical properties of the nanostructure, its hydrophilic/hydrophobic behavior and topological characteristics, atomic force microscopy, molecular dynamics simulations and water contact angle studies were combined. When changing the nanopillar composition, a significant and opposite variation was observed in their mechanical properties. As temperature increased above the LCST, the stiffness of PNIPAm nanopillars, as expected, did so too, in contrast to the stiffness of PNIPAm-AAm nanopillars that decreased significantly. The molecular dynamics simulations proposed a local molecular rearrangement in our nanosystems at the LCST. The local aggregation of NIPAm segments near the center of the nanopillars displaced the hydrophilic AAm units towards the surface of the structure leading to contact with the aqueous environment. This behavior was confirmed via contact angle measurements below and above the LCST.
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Affiliation(s)
- Belén Sanz
- Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
| | - Catalina von Bilderling
- Instituto de Física de Buenos Aires (IFIBA-CONICET) and Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EHA Buenos Aires, Argentina
| | - Jimena S Tuninetti
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) - Departamento de Química - Facultad de Ciencias Exactas - Universidad Nacional de La Plata - CONICET, 1900 La Plata, Argentina.
| | - Lía Pietrasanta
- Instituto de Física de Buenos Aires (IFIBA-CONICET) and Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EHA Buenos Aires, Argentina and Centro de Microscopías Avanzadas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EHA Buenos Aires, Argentina
| | - Carmen Mijangos
- Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
| | - Gabriel S Longo
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) - Departamento de Química - Facultad de Ciencias Exactas - Universidad Nacional de La Plata - CONICET, 1900 La Plata, Argentina.
| | - Omar Azzaroni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) - Departamento de Química - Facultad de Ciencias Exactas - Universidad Nacional de La Plata - CONICET, 1900 La Plata, Argentina.
| | - Juan M Giussi
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) - Departamento de Química - Facultad de Ciencias Exactas - Universidad Nacional de La Plata - CONICET, 1900 La Plata, Argentina.
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6
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Polymer grafted magnetic nanoparticles for delivery of anticancer drug at lower pH and elevated temperature. J Colloid Interface Sci 2016; 467:70-80. [PMID: 26773613 DOI: 10.1016/j.jcis.2016.01.008] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 01/05/2016] [Accepted: 01/05/2016] [Indexed: 11/23/2022]
Abstract
Efficient and controlled delivery of therapeutics to tumor cells is one of the important issues in cancer therapy. In the present work, a series of pH- and temperature-responsive polymer grafted iron oxide nanoparticles were prepared by simple coupling of aminated iron oxide nanoparticle with poly(N-isopropylacrylamide-ran-poly(ethylene glycol) methyl ether acrylate)-block-poly(acrylic acid) (P(NIPA-r-PEGMEA)-b-PAA). For this, three water soluble block polymers were prepared via reversible addition fragmentation transfer (RAFT) polymerization technique. At first, three different block copolymers were prepared by polymerizing mixture of NIPA and PEGMEA (with varying mole ratio) in presence of poly(tert-butyl acrylate) (PtBA) macro chain transfer agent. Subsequently, P(NIPA-r-PEGMEA)-b-PAA copolymers were synthesized by hydrolyzing tert-butyl acrylate groups of the P(NIPA-r-PEGMEA)-b-PtBA copolymers. The resulting polymers were then grafted to iron oxide nanoparticles, and these functionalized nanoparticles were thoroughly characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), zeta potential measurements, transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), vibrating sample magnetometer (VSM) and Fourier transform infrared spectroscopy (FTIR). Doxorubicin (DOX), an anti-cancer drug, was loaded into the polymer coated nanoparticles and its release behavior was subsequently studied at different pH and temperatures. The drug release pattern revealed a sustained release of DOX preferentially at the desired lysosomal pH of cancer cells (pH 5.0) and slightly above the physiological temperature depending upon the composition of the copolymers. The potential anticancer activity of the polymer grafted DOX loaded nanoparticles were established by MTT assay and apoptosis study of cervical cancer ME 180cells in presence of the nanoparticles. Thus, these particles can be utilized for controlled delivery of anticancer drugs at the desired lysosomal pH and/or by slightly heating the cells using magnetic hyperthermia.
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8
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Pillay V, Tsai TS, Choonara YE, du Toit LC, Kumar P, Modi G, Naidoo D, Tomar LK, Tyagi C, Ndesendo VMK. A review of integrating electroactive polymers as responsive systems for specialized drug delivery applications. J Biomed Mater Res A 2013; 102:2039-54. [DOI: 10.1002/jbm.a.34869] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Accepted: 07/01/2013] [Indexed: 01/24/2023]
Affiliation(s)
- Viness Pillay
- Department of Pharmacy and Pharmacology; Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
| | - Tong-Sheng Tsai
- Department of Pharmacy and Pharmacology; Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
| | - Yahya E. Choonara
- Department of Pharmacy and Pharmacology; Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
| | - Lisa C. du Toit
- Department of Pharmacy and Pharmacology; Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
| | - Pradeep Kumar
- Department of Pharmacy and Pharmacology; Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
| | - Girish Modi
- Department of Neurology; Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
| | - Dinesh Naidoo
- Department of Neurosurgery; Faculty of Health Sciences; University of Witwatersrand; Johannesburg South Africa
| | - Lomas K. Tomar
- Department of Pharmacy and Pharmacology; Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
| | - Charu Tyagi
- Department of Pharmacy and Pharmacology; Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
| | - Valence M. K. Ndesendo
- Department of Pharmacy and Pharmacology; Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
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9
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Naturally and synthetic smart composite biomaterials for tissue regeneration. Adv Drug Deliv Rev 2013; 65:471-96. [PMID: 22465488 DOI: 10.1016/j.addr.2012.03.009] [Citation(s) in RCA: 210] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2012] [Revised: 03/01/2012] [Accepted: 03/07/2012] [Indexed: 11/23/2022]
Abstract
The development of smart biomaterials for tissue regeneration has become the focus of intense research interest. More opportunities are available by the composite approach of combining the biomaterials in the form of biopolymers and/or bioceramics either synthetic or natural. Strategies to provide smart capabilities to the composite biomaterials primarily seek to achieve matrices that are instructive/inductive to cells, or that stimulate/trigger target cell responses that are crucial in the tissue regeneration processes. Here, we review in-depth, recent developments concerning smart composite biomaterials available for delivery systems of biofactors and cells and scaffolding matrices in tissue engineering. Smart composite designs are possible by modulating the bulk and surface properties that mimic the native tissues, either in chemical (extracellular matrix molecules) or in physical properties (e.g. stiffness), or by introducing external therapeutic molecules (drugs, proteins and genes) within the structure in a way that allows sustainable and controllable delivery, even time-dependent and sequential delivery of multiple biofactors. Responsiveness to internal or external stimuli, including pH, temperature, ionic strength, and magnetism, is another promising means to improve the multifunctionality in smart scaffolds with on-demand delivery potential. These approaches will provide the next-generation platforms for designing three-dimensional matrices and delivery systems for tissue regenerative applications.
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12
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Lue SJ, Chen CH, Shih CM. Tuning of Lower Critical Solution Temperature (LCST) of Poly(N-Isopropylacrylamide-co-Acrylic acid) Hydrogels. J MACROMOL SCI B 2011. [DOI: 10.1080/00222341003784550] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Shingjiang Jessie Lue
- a Department of Chemical and Materials Engineering , Chang Gung University , Kwei-shan, Taoyuan, Taiwan
| | - Chi-Hwa Chen
- a Department of Chemical and Materials Engineering , Chang Gung University , Kwei-shan, Taoyuan, Taiwan
| | - Chao-Ming Shih
- a Department of Chemical and Materials Engineering , Chang Gung University , Kwei-shan, Taoyuan, Taiwan
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