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Masuko K, Kumano C, Sugawara R, Nakabayashi K, Mori H. Polymerization‐induced self‐assembly of amino‐acid‐based nano‐objects by reversible addition–fragmentation chain‐transfer dispersion polymerization. JOURNAL OF POLYMER SCIENCE 2021. [DOI: 10.1002/pol.20210292] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Kazunori Masuko
- Graduate School of Organic Materials Science Yamagata University Yonezawa Japan
| | - Chiharu Kumano
- Graduate School of Organic Materials Science Yamagata University Yonezawa Japan
| | - Ryo Sugawara
- Graduate School of Organic Materials Science Yamagata University Yonezawa Japan
| | | | - Hideharu Mori
- Graduate School of Organic Materials Science Yamagata University Yonezawa Japan
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2
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Yoshimatsu K, Fruehauf KR, Zhu Q, Weisman A, Fan J, Xue M, Beierle JM, Rose PE, Aral J, Epstein LF, Tagari P, Miranda LP, Shea KJ. Metal-Free Polymer-Based Affinity Medium for Selective Purification of His6-Tagged Proteins. Biomacromolecules 2021; 22:1695-1705. [PMID: 33783189 DOI: 10.1021/acs.biomac.1c00119] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
We report a metal free synthetic hydrogel copolymer with affinity and selectivity for His6-tagged peptides and proteins. Small libraries of copolymers incorporating charged and hydrophobic functional groups were screened by an iterative process for His6 peptide affinity. The monomer selection was guided by interactions found in the crystal structure of an anti-His tag antibody-His6 peptide antigen complex. Synthetic copolymers incorporating a phenylalanine-derived monomer were found to exhibit strong affinity for both His6-containing peptides and proteins. The proximity of both aromatic and negatively charged functional groups were important factors for the His6 affinity of hydrogel copolymers. His6 affinity was not compromised by the presence of enzyme cleavage sequences. The His6-copolymer interactions are pH sensitive: the copolymer selectively captured His6 peptides at pH 7.8 while the interactions were substantially weakened at pH 8.6. This provided mild conditions for releasing His6-tagged proteins from the copolymer. Finally, a synthetic copolymer coated chromatographic medium was prepared and applied to the purification of a His6-tagged protein from an E. coli expression system. The results establish that a synthetic copolymer-based affinity medium can function as an effective alternative to immobilized metal ion columns for the purification of His6-tagged proteins.
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Affiliation(s)
- Keiichi Yoshimatsu
- Department of Chemistry, University of California, Irvine, California 92697, United States.,Department of Chemistry, Missouri State University, 901 South National Avenue, Springfield, Missouri 65897, United States
| | - Krista R Fruehauf
- Department of Chemistry, University of California, Irvine, California 92697, United States
| | - Quanhong Zhu
- Department of Chemistry, University of California, Irvine, California 92697, United States
| | - Adam Weisman
- Department of Chemistry, University of California, Irvine, California 92697, United States
| | - Jun Fan
- Department of Chemistry, University of California, Irvine, California 92697, United States
| | - Min Xue
- Department of Chemistry, University of California, Irvine, California 92697, United States
| | - John M Beierle
- Department of Chemistry, University of California, Irvine, California 92697, United States
| | - Paul E Rose
- Therapeutic Discovery, Amgen Inc., One Amgen Center Drive, Thousand Oaks, California 91320, United States
| | - Jennifer Aral
- Therapeutic Discovery, Amgen Inc., One Amgen Center Drive, Thousand Oaks, California 91320, United States
| | - Linda F Epstein
- Therapeutic Discovery, Amgen Inc., One Amgen Center Drive, Thousand Oaks, California 91320, United States
| | - Philip Tagari
- Therapeutic Discovery, Amgen Inc., One Amgen Center Drive, Thousand Oaks, California 91320, United States
| | - Les P Miranda
- Therapeutic Discovery, Amgen Inc., One Amgen Center Drive, Thousand Oaks, California 91320, United States
| | - Kenneth J Shea
- Department of Chemistry, University of California, Irvine, California 92697, United States
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3
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Multi-stimuli-responsive chiral-achiral ampholytic block copolymers composed of poly(N-acryloyl amino acid) and poly(vinyl amine). REACT FUNCT POLYM 2020. [DOI: 10.1016/j.reactfunctpolym.2020.104540] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Marcisz K, Kaniewska K, Mackiewicz M, Nowinska A, Romanski J, Stojek Z, Karbarz M. Electroactive, Mediating and Thermosensitive Microgel Useful for Covalent Entrapment of Enzymes and Formation of Sensing Layer in Biosensors. ELECTROANAL 2018. [DOI: 10.1002/elan.201800459] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Kamil Marcisz
- Faculty of ChemistryBiological and Chemical Research CenterUniversity of Warsaw 101 Żwirki i Wigury Av., PL 02-089 Warsaw Poland
| | - Klaudia Kaniewska
- Faculty of ChemistryBiological and Chemical Research CenterUniversity of Warsaw 101 Żwirki i Wigury Av., PL 02-089 Warsaw Poland
| | - Marcin Mackiewicz
- Faculty of ChemistryBiological and Chemical Research CenterUniversity of Warsaw 101 Żwirki i Wigury Av., PL 02-089 Warsaw Poland
| | - Anna Nowinska
- Faculty of ChemistryBiological and Chemical Research CenterUniversity of Warsaw 101 Żwirki i Wigury Av., PL 02-089 Warsaw Poland
| | - Jan Romanski
- Faculty of ChemistryBiological and Chemical Research CenterUniversity of Warsaw 101 Żwirki i Wigury Av., PL 02-089 Warsaw Poland
| | - Zbigniew Stojek
- Faculty of ChemistryBiological and Chemical Research CenterUniversity of Warsaw 101 Żwirki i Wigury Av., PL 02-089 Warsaw Poland
| | - Marcin Karbarz
- Faculty of ChemistryBiological and Chemical Research CenterUniversity of Warsaw 101 Żwirki i Wigury Av., PL 02-089 Warsaw Poland
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Casolaro M, Casolaro I, Akimoto J, Ueda M, Ueki M, Ito Y. Antibacterial Properties of Silver Nanoparticles Embedded on Polyelectrolyte Hydrogels Based on α-Amino Acid Residues. Gels 2018; 4:E42. [PMID: 30674818 PMCID: PMC6209242 DOI: 10.3390/gels4020042] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Revised: 04/28/2018] [Accepted: 05/02/2018] [Indexed: 01/08/2023] Open
Abstract
Polyelectrolyte hydrogels bearing l-phenylalanine (PHE), l-valine (AVA), and l-histidine (Hist) residues were used as scaffolds for the formation of silver nanoparticles by reduction of Ag⁺ ions with NaBH₄. The interaction with the metal ion allowed a prompt collapse of the swollen hydrogel, due to the neutralization reaction of basic groups present on the polymer. The imidazole nitrogen of the hydrogel with Hist demonstrated greater complexing capacity with the Ag⁺ ion compared to the hydrogels with carboxyl groups. The subsequent reduction to metallic silver allowed for the restoration of the hydrogel's degree of swelling to the starting value. Transmission electron microscopy (TEM) and spectroscopic analyses showed, respectively, a uniform distribution of the 15 nm spherical silver nanoparticles embedded on the hydrogel and peak optical properties around a wavelength of 400 nm due to the surface plasmonic effect. Unlike native hydrogels, the composite hydrogels containing silver nanoparticles showed good antibacterial activity as gram+/gram- bactericides, and higher antifungal activity against S. cerevisiae.
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Affiliation(s)
- Mario Casolaro
- Dipartimento di Biotecnologie, Chimica e Farmacia (Dipartimento di Eccellenza 2018⁻2022), Università degli Studi di Siena, via A. Moro, 2-53100 Siena, Italy.
| | - Ilaria Casolaro
- ASST Valtellina e Alto Lario, Dipartimento di Salute Mentale, via Stelvio, 25-23100 Sondrio, Italy.
| | - Jun Akimoto
- Nano Medical Engineering Laboratory, Riken, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
| | - Motoki Ueda
- Nano Medical Engineering Laboratory, Riken, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
| | - Masashi Ueki
- Nano Medical Engineering Laboratory, Riken, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
| | - Yoshihiro Ito
- Nano Medical Engineering Laboratory, Riken, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
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Dhibar S, Dey A, Majumdar S, Ghosh D, Mandal A, Ray PP, Dey B. A supramolecular Cd(ii)-metallogel: an efficient semiconductive electronic device. Dalton Trans 2018; 47:17412-17420. [DOI: 10.1039/c8dt03773f] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A supramolecular Cd(ii)-metallogel with oxalic acid in DMF medium has been achieved, and the semi-conductive characteristics such as the Schottky barrier diode nature of the metallogel were explored.
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Affiliation(s)
- Subhendu Dhibar
- Department of Chemistry
- Visva-Bharati University
- Santiniketan 731235
- India
| | - Arka Dey
- Department of Physics
- Jadavpur University
- Kolkata
- India
| | - Santanu Majumdar
- Department of Chemistry
- Visva-Bharati University
- Santiniketan 731235
- India
| | - Debasish Ghosh
- Department of Chemistry
- Visva-Bharati University
- Santiniketan 731235
- India
| | - Amit Mandal
- Department of Chemistry
- Behala college
- Kolkata
- India
| | | | - Biswajit Dey
- Department of Chemistry
- Visva-Bharati University
- Santiniketan 731235
- India
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Jeong E, Lee G, Han SW, Lee WJ, Choi HS, Lee Y, Kim JW. Polyelectrolyte/silica-layered hydrogel microcapsules as vehicles with remarkable shell impermeability. J IND ENG CHEM 2017. [DOI: 10.1016/j.jiec.2016.10.030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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SOHAIL MUHAMMAD, AHMAD MAHMOOD, MINHAS MUHAMMADUSMAN, RASHID HAROON, KHALID IKRIMA. Development and In Vitro Evaluation of High Molecular Weight Chitosan Based Polymeric Composites for Controlled Delivery of Valsartan. ADVANCES IN POLYMER TECHNOLOGY 2016. [DOI: 10.1002/adv.21558] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- MUHAMMAD SOHAIL
- Department of Pharmacy; COMSATS Institute of Information Technology; Abbottabad 22060 Pakistan
| | - MAHMOOD AHMAD
- Faculty of Pharmacy and Alternative Medicine; The Islamia University of Bahawalpur; Bahawalpur 63100 Pakistan
| | - MUHAMMAD USMAN MINHAS
- Faculty of Pharmacy and Alternative Medicine; The Islamia University of Bahawalpur; Bahawalpur 63100 Pakistan
| | - HAROON RASHID
- Faculty of Pharmacy and Alternative Medicine; The Islamia University of Bahawalpur; Bahawalpur 63100 Pakistan
| | - IKRIMA KHALID
- Faculty of Pharmacy and Alternative Medicine; The Islamia University of Bahawalpur; Bahawalpur 63100 Pakistan
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Casolaro M, Casolaro I. Polyelectrolyte Hydrogel Platforms for the Delivery of Antidepressant Drugs. Gels 2016; 2:E24. [PMID: 30674155 PMCID: PMC6318638 DOI: 10.3390/gels2040024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 09/20/2016] [Accepted: 09/21/2016] [Indexed: 12/13/2022] Open
Abstract
Some vinyl hydrogels containing α-amino acid residues (l-phenylalanine, l-valine) were used as polyelectrolyte platforms for the evaluation of the controlled release of two antidepressants (paroxetine and duloxetine). The closer acidity constant (pKa) values of the two drugs show a closer release profile in physiological phosphate buffered saline (PBS) buffer (pH 7.40) and for long periods of time. The great electrostatic interaction forces between the COO- group of the hydrogel and the protonated secondary amino nitrogen of the drug are the main factor improving the release kinetics; this release was found to be slower compared to that of two structurally related drugs bearing the tertiary amino nitrogen atom (citalopram and trazodone). Moreover, at the lower value of pH 4.60, paroxetine showed a flatter release profile from the hydrogel containing the l-phenylalanine residues that, after six days, is half of that shown by duloxetine. Further effects due to steric and hydrophobic interactions may contribute to the different release profile. A further stimulation with alternating magnetic fields (AMF) of low frequency (20 kHz/50 W) enhanced the release of the drug at pH 7.40 from the hydrogel containing magnetic nanoparticles. Both AMF and PBS solution at pH 7.40 were used to trigger the 'on-demand' pulsatile paroxetine release from the nanocomposite hydrogel.
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Affiliation(s)
- Mario Casolaro
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, Via Aldo Moro 2, Siena 53100, Italy.
| | - Ilaria Casolaro
- Psychiatry Resident, University of Siena, Siena 53100, Italy.
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Bauri K, Roy SG, De P. Side-Chain Amino-Acid-Derived Cationic Chiral Polymers by Controlled Radical Polymerization. MACROMOL CHEM PHYS 2015. [DOI: 10.1002/macp.201500271] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Kamal Bauri
- Polymer Research Centre; Department of Chemical Sciences; Indian Institute of Science Education and Research Kolkata Mohanpur; 741246 Nadia West Bengal India
| | - Saswati Ghosh Roy
- Polymer Research Centre; Department of Chemical Sciences; Indian Institute of Science Education and Research Kolkata Mohanpur; 741246 Nadia West Bengal India
| | - Priyadarsi De
- Polymer Research Centre; Department of Chemical Sciences; Indian Institute of Science Education and Research Kolkata Mohanpur; 741246 Nadia West Bengal India
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11
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Casolaro M, Casolaro I. Controlled release of antidepressant drugs by multiple stimuli-sensitive hydrogels based on α-aminoacid residues. J Drug Deliv Sci Technol 2015. [DOI: 10.1016/j.jddst.2015.09.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Microfluidic immobilization of polyglycerin-b-poly(ε-caprolactone) polymeric micelles in uniform zwitterionic hydrogel microparticles for molecular network-mediated drug release. Colloid Polym Sci 2015. [DOI: 10.1007/s00396-014-3493-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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13
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Casolaro M, Casolaro I, Bottari S, Del Bello B, Maellaro E, Demadis KD. Long-term doxorubicin release from multiple stimuli-responsive hydrogels based on α-amino-acid residues. Eur J Pharm Biopharm 2014; 88:424-33. [DOI: 10.1016/j.ejpb.2014.06.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Revised: 05/28/2014] [Accepted: 06/04/2014] [Indexed: 11/24/2022]
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14
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Synthesis, spectroscopic and DFT structural characterization of two novel ruthenium(III) oxicam complexes. In vivo evaluation of anti-inflammatory and gastric damaging activities. J Inorg Biochem 2014; 134:25-35. [DOI: 10.1016/j.jinorgbio.2014.01.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 01/15/2014] [Accepted: 01/16/2014] [Indexed: 11/19/2022]
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15
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Kim Y, Babu VR, Rao KK, Lim JM, Thangadurai TD, Lee YI. Stimuli-Sensitive Poly(NIPA-co-APA) Hydrogels for the Controlled Release of Keterolac Tromethamine. JOURNAL OF THE KOREAN CHEMICAL SOCIETY-DAEHAN HWAHAK HOE JEE 2014. [DOI: 10.5012/jkcs.2014.58.1.92] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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16
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Shafaghi S, Moghadam PN, Fareghi AR, Baradarani MM. Synthesis and characterization of a drug-delivery system based on melamine-modified poly(vinyl acetate-co-maleic anhydride) hydrogel. J Appl Polym Sci 2014. [DOI: 10.1002/app.40389] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Samira Shafaghi
- Department of Organic Chemistry; Faculty of Chemistry, University of Urmia; Urmia Iran
| | | | - Amir Reza Fareghi
- Department of Organic Chemistry; Faculty of Chemistry, University of Urmia; Urmia Iran
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Chen J, Xia J, Tian H, Tang Z, He C, Chen X. Thermo-/pH-dual responsive properties of hyperbranched polyethylenimine grafted by phenylalanine. Arch Pharm Res 2013; 37:142-8. [PMID: 24263409 PMCID: PMC3889500 DOI: 10.1007/s12272-013-0288-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Accepted: 10/31/2013] [Indexed: 11/24/2022]
Abstract
Novel thermo- and pH-dual responsive amphiphilic copolymers were synthesized based on hyperbranched polyethylenimine (PEI) by grafting l-phenylalanine. The phenylalanine-modified PEI exhibited lower cytotoxicity than commercial PEI. These copolymers showed the phenomena of phase transitions in response to pH and temperature. The dilute copolymer solution at lower pH displayed the higher LCST. Furthermore, LCST increased with the increasing of phenylalanine grafting density. LCST of these copolymers were tunable from 7.2 to 59.6 °C by the degree of amidation and pH of solution. DLS and TEM experiments certified that the copolymer chains aggregated to form small size particles as increasing the temperature above LCST. For these reasons, the obtained smart copolymers were considered to be potential gene/drug carriers in biomedical field.
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Affiliation(s)
- Jie Chen
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
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18
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Kaniewska K, Romański J, Karbarz M. Oxidation of ferrocenemethanol grafted to a hydrogel network through cysteine for triggering volume phase transition. RSC Adv 2013. [DOI: 10.1039/c3ra42405g] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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19
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Wang Y, Li X, Wu G, Chen J, Wang Y, Gao H, Ma J. Precise control of drug release from dually responsive poly(ether urethane) nanoparticles. RSC Adv 2013. [DOI: 10.1039/c3ra41410h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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21
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Cha HR, Babu VR, Rao KK, Kim YH, Mei S, Joo WH, Lee YI. Fabrication of Amino Acid Based Silver Nanocomposite Hydrogels from PVA- Poly(Acrylamide-co-Acryloyl phenylalanine) and Their Antimicrobial Studies. B KOREAN CHEM SOC 2012. [DOI: 10.5012/bkcs.2012.33.10.3191] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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22
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Casolaro M, Casolaro I, Lamponi S. Stimuli-responsive hydrogels for controlled pilocarpine ocular delivery. Eur J Pharm Biopharm 2012; 80:553-61. [DOI: 10.1016/j.ejpb.2011.11.013] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2011] [Revised: 11/16/2011] [Accepted: 11/18/2011] [Indexed: 11/27/2022]
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24
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Sun JX, Wang YL, Dou SH. A novel positively thermo-sensitive hydrogel based on ethylenediaminetetraacetic dianhydride and piperazine: Design, synthesis and characterization. CHINESE CHEM LETT 2012. [DOI: 10.1016/j.cclet.2011.09.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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25
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Romanski J, Karbarz M, Pyrzynska K, Jurczak J, Stojek Z. Polymeric hydrogels modified with ornithine and lysine: Sorption and release of metal cations and amino acids. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.25063] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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26
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Casolaro M, Barbara DB, Emilia M. Hydrogel containing l-valine residues as a platform for cisplatin chemotherapy. Colloids Surf B Biointerfaces 2011; 88:389-95. [DOI: 10.1016/j.colsurfb.2011.07.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2011] [Accepted: 07/06/2011] [Indexed: 12/31/2022]
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27
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Smart organic–inorganic hybrids based on the complexation of amino acid-based polymers and water-soluble silsesquioxane nanoparticles. REACT FUNCT POLYM 2011. [DOI: 10.1016/j.reactfunctpolym.2011.07.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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28
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Feng J, Fu LX, Wang J, Wang W, Li JH, Qiao YT, Sun PC, Yuan Z. A comparison study between polymeric ligand and monomeric ligand for oligopeptide adsorption. J Colloid Interface Sci 2011; 355:478-85. [DOI: 10.1016/j.jcis.2010.12.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Revised: 12/12/2010] [Accepted: 12/14/2010] [Indexed: 11/27/2022]
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29
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Kim YH, Babu VR, Thangadurai DT, Rao KK, Cha HR, Kim CD, Joo WH, Lee YI. Synthesis, Characterization, and Antibacterial Applications of Novel Copolymeric Silver Nanocomposite Hydrogels. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.2.553] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Abstract
There is great current interest in the design of robust synthetic polymers for the preparation of novel functional, well-defined, biocompatible and tailorable materials for a range of possible applications. In this work we have used reversible addition fragmentation chain transfer (RAFT) polymerization to prepare chiral and responsive amphiphilic block copolymers (based on polyphenylalanine acrylamide), which can be assembled at different pHs to form well-defined nanostructures. The morphology and size of the derived block polymers were explored using TEM, DLS and SLS measurements, while stability was examined by fluorescence and NMR spectroscopy. The application of these chiral and responsive nanostructures in the resolution of hydrophilic racemic amino acids has also been explored.
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Feng J, Fu L, Li J, Wang W, Yuan Z. Application of surface plasmon resonance in screening adsorbents and explaining adsorption phenomena using model polymers. ACTA ACUST UNITED AC 2010. [DOI: 10.1007/s11434-010-4171-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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32
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Yang M, Liu C, Li Z, Gao G, Liu F. Temperature-Responsive Properties of Poly(acrylic acid-co-acrylamide) Hydrophobic Association Hydrogels with High Mechanical Strength. Macromolecules 2010. [DOI: 10.1021/ma1022555] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Meng Yang
- College of Chemistry, Jilin University, Changchun 130012, China
| | - Chang Liu
- College of Chemistry, Jilin University, Changchun 130012, China
| | - Zhiying Li
- College of Chemistry, Jilin University, Changchun 130012, China
| | - Ge Gao
- College of Chemistry, Jilin University, Changchun 130012, China
| | - Fengqi Liu
- College of Chemistry, Jilin University, Changchun 130012, China
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Feng J, Wang W, Li JH, Fu LX, Zhao JX, Qiao YT, Sun PC, Yuan Z. Effects of oligopeptide's conformational changes on its adsorption. Colloids Surf B Biointerfaces 2010; 83:229-36. [PMID: 21145711 DOI: 10.1016/j.colsurfb.2010.11.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2010] [Revised: 11/11/2010] [Accepted: 11/11/2010] [Indexed: 11/16/2022]
Abstract
We report the effects of peptide adsorption to cross-linked polymers (adsorbents) by its conformational changes. Two adsorbents, APhe and ALeu, were prepared and expected to show high affinity to the oligopeptide VW-8 (NH(2)-Val-Val-Arg-Gly-Cys-Thr-Trp-Trp-COOH) according to our previous studies. These absorbents bared the residues of phenylalanine and leucine, respectively, and carried both hydrophobic and electrical groups. The adsorbent AAsp, which carried only the electrostatic groups, was also prepared as a reference. Both APhe and ALeu were found to exhibit higher VW-8 capacity than AAsp, in which APhe showed the highest VW-8 capacity (13.6 mg/g). The VW-8 adsorption to ALeu and APhe was analyzed using a variety of techniques, including the surface plasmon resonance (SPR) technology, nuclear magnetic resonance (NMR) spectra and isothermal titration calorimetry (ITC). The comprehensive experimental data together indicated that APhe could induce a conformational change of VW-8 from a random-coil to a β-strand structure due to its ability to provide the strong ring stacking and electrostatic interactions, which is believed to be responsible for its highest adsorption affinity (K(a)=2.59×10(7) M(-1)). In contrast, the hydrophobic interactions provided by ALeu were not strong enough to induce a VW-8 conformational change to a regular structure, and therefore it exhibited a relatively lower affinity to VW-8 (K(a)=6.23×10(5) M(-1)). The results presented in this work showed that peptide adsorption can be influenced by its conformational changes induced by suitable adsorbents via strong non-covalent interactions.
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Affiliation(s)
- Jing Feng
- Key Laboratory of Functional Polymer Materials, Ministry of Education, College of Chemistry, Nankai University, Tianjin 300071, PR China
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Xia J, Chen L, Chen J, Tian H, Li F, Zhu X, Li G, Chen X. Hydrophobic Polyphenylalanine-Grafted Hyperbranched Polyethylenimine and its in vitro Gene Transfection. Macromol Biosci 2010; 11:211-8. [DOI: 10.1002/mabi.201000302] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Revised: 08/24/2010] [Indexed: 01/04/2023]
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Patra T, Pal A, Dey J. A smart supramolecular hydrogel of N(alpha)-(4-n-alkyloxybenzoyl)-L-histidine exhibiting pH-modulated properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:7761-7767. [PMID: 20380403 DOI: 10.1021/la904540x] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Six L-histidine-based amphiphiles, N(alpha)-(4-n-alkyloxybenzoyl)-L-histidine of different hydrocarbon chain lengths, were designed, synthesized, and examined for their ability to gelate water. Four of members of this family of amphiphiles were observed to form thermoreversible hydrogels in a wide range of pH at room temperature. The structural variations were characterized by critical gelation concentration, gelation time, gel melting temperature (T(gs)), rheology, and electron microscopy. Among the amphiphiles, the n-octyl derivative showed better gelation ability in the studied pH range. The amphiphiles were found to have T(gs) higher than body temperature (37 degrees C) showing their stability. Also, relatively higher yield stress (>1000 Pa) values of the hydrogels show their higher strength. The effective gelator molecules self-assemble into fibrous structures. Scanning electron microscopic picture of the hydrogels revealed large ribbons with right-handed twist. Small-angle XRD and circular dichroism spectroscopy were also employed to characterize the hydrogels. It was observed that pi-pi stacking, hydrophobic interaction, amide hydrogen bonding, and solubility factor contribute to the stability and strength of the hydrogels.
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Affiliation(s)
- Trilochan Patra
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India
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Tamasi G, Casolaro M, Magnani A, Sega A, Chiasserini L, Messori L, Gabbiani C, Valiahdi SM, Jakupec MA, Keppler BK, Hursthouse MB, Cini R. New platinum-oxicam complexes as anti-cancer drugs. Synthesis, characterization, release studies from smart hydrogels, evaluation of reactivity with selected proteins and cytotoxic activity in vitro. J Inorg Biochem 2010; 104:799-814. [PMID: 20447694 DOI: 10.1016/j.jinorgbio.2010.03.010] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2009] [Revised: 03/17/2010] [Accepted: 03/19/2010] [Indexed: 10/19/2022]
Abstract
The reaction of aqueous cis-[Pt(NH(3))(2)(H(2)O)(2)](NO(3))(2) with Na(+)HMEL(-) (H(2)MEL, meloxicam, 4-hydroxy-2-methyl-N-(5-methyl-1,3-thiazol-2-yl)-2H-1,2-benzothiazine-3-carboxamide-1,1-dioxide), and Na(+)HISO(-) (H(2)ISO, isoxicam, 4-hydroxy-2-methyl-N-(5-methylisoxazol-3-yl)-2H-1,2-benzothiazine-3-carboxamide-1,1-dioxide) at pH 7 produced micro-crystalline cis-[Pt(NH(3))(2)(N(1')-HMEL)(2)], 5 and cis-[Pt(NH(3))(2)(N(1')-HISO)(2)], 6. The X-ray diffraction structure of 5 shows two HMEL(-) anions donating through the thiazole nitrogen atoms and adopting a head-to-tail (HT) conformation. The (1)H NMR spectrum for 5 from DMSO-d(6) shows inertness of the complex up to at least 24h. Delivery studies for 5 and 6 from vinyl hydrogel based on L-phenylalanine (pH 6.5, 25 degrees C) show that concentrations of complexes ranging between 2.5 and 5 microM can be reached after a day. Compounds 5 and 6 show strong anti-proliferative effects on CH1 cells (ovarian carcinoma, human) in vitro, IC(50) values being 0.60 and 0.37 microM, respectively (0.16 microM for reference, cis-diamminodichloridoplatinum(II), cisplatin). ESI-MS measurements clearly documented that both 5 and 6 form adducts with the three model proteins ubiquitin (UBI), cytochrome c (CYT C) and superoxide dismutase (SOD), the HISO(-) complex being significantly more effective than the HMEL(-) one. Density functional methods help in finding rationale for the easiest dissociation of Pt-H(2)ISO/HISO bonds when compared to the Pt-N(1)(')-H(2)MEL/N(1)(')-HMEL linkages.
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Affiliation(s)
- Gabriella Tamasi
- Department of Chemistry, Università di Siena, Via Aldo Moro 2, I-53100 Siena, Italy
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O'Reilly RK. Using controlled radical polymerisation techniques for the synthesis of functional polymers containing amino acid moieties. POLYM INT 2010. [DOI: 10.1002/pi.2830] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Casolaro M, Staltari L, Anselmi C, Mendichi R, Bernini A. The protonation thermodynamics of cyclodextrin-containing polymers for drug inclusion. J INCL PHENOM MACRO 2009. [DOI: 10.1007/s10847-009-9690-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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39
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A nanoscale drug-entrapment strategy for hydrogel-based systems for the delivery of poorly soluble drugs. Biomaterials 2009; 30:2102-11. [DOI: 10.1016/j.biomaterials.2008.12.047] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2008] [Accepted: 12/19/2008] [Indexed: 11/20/2022]
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Casolaro M, Cini R, Del Bello B, Ferrali M, Maellaro E. Cisplatin/Hydrogel Complex In Cancer Therapy. Biomacromolecules 2009; 10:944-9. [DOI: 10.1021/bm8014939] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Mario Casolaro
- Dipartimento di Scienze e Tecnologie Chimiche e dei Biosistemi, and Dipartimento di Fisiopatologia, Medicina Sperimentale e Sanità Pubblica, Università degli Studi di Siena, Via Aldo Moro 2, I-53100 Siena, Italy
| | - Renzo Cini
- Dipartimento di Scienze e Tecnologie Chimiche e dei Biosistemi, and Dipartimento di Fisiopatologia, Medicina Sperimentale e Sanità Pubblica, Università degli Studi di Siena, Via Aldo Moro 2, I-53100 Siena, Italy
| | - Barbara Del Bello
- Dipartimento di Scienze e Tecnologie Chimiche e dei Biosistemi, and Dipartimento di Fisiopatologia, Medicina Sperimentale e Sanità Pubblica, Università degli Studi di Siena, Via Aldo Moro 2, I-53100 Siena, Italy
| | - Marco Ferrali
- Dipartimento di Scienze e Tecnologie Chimiche e dei Biosistemi, and Dipartimento di Fisiopatologia, Medicina Sperimentale e Sanità Pubblica, Università degli Studi di Siena, Via Aldo Moro 2, I-53100 Siena, Italy
| | - Emilia Maellaro
- Dipartimento di Scienze e Tecnologie Chimiche e dei Biosistemi, and Dipartimento di Fisiopatologia, Medicina Sperimentale e Sanità Pubblica, Università degli Studi di Siena, Via Aldo Moro 2, I-53100 Siena, Italy
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41
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Horta A, Molina MJ, Gómez-Antón MR, Piérola IF. The pH Inside a pH-Sensitive Gel Swollen in Aqueous Salt Solutions: Poly(N-vinylimidazole). Macromolecules 2009. [DOI: 10.1021/ma802204b] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Arturo Horta
- Departamento de Ciencias y Técnicas Fisicoquímicas, Facultad de Ciencias, and Departamento de Química Aplicada a la Ingeniería, ETSI Industriales, Universidad a Distancia (UNED), 28040 Madrid, Spain
| | - M. Jesús Molina
- Departamento de Ciencias y Técnicas Fisicoquímicas, Facultad de Ciencias, and Departamento de Química Aplicada a la Ingeniería, ETSI Industriales, Universidad a Distancia (UNED), 28040 Madrid, Spain
| | - M. Rosa Gómez-Antón
- Departamento de Ciencias y Técnicas Fisicoquímicas, Facultad de Ciencias, and Departamento de Química Aplicada a la Ingeniería, ETSI Industriales, Universidad a Distancia (UNED), 28040 Madrid, Spain
| | - Inés F. Piérola
- Departamento de Ciencias y Técnicas Fisicoquímicas, Facultad de Ciencias, and Departamento de Química Aplicada a la Ingeniería, ETSI Industriales, Universidad a Distancia (UNED), 28040 Madrid, Spain
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Tamasi G, Serinelli F, Consumi M, Magnani A, Casolaro M, Cini R. Release studies from smart hydrogels as carriers for piroxicam and copper(II)–oxicam complexes as anti-inflammatory and anti-cancer drugs. X-ray structures of new copper(II)–piroxicam and –isoxicam complex molecules. J Inorg Biochem 2008; 102:1862-73. [DOI: 10.1016/j.jinorgbio.2008.06.009] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2008] [Revised: 06/11/2008] [Accepted: 06/13/2008] [Indexed: 10/21/2022]
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Khan A. Preparation and characterization of N-isopropylacrylamide/acrylic acid copolymer core–shell microgel particles. J Colloid Interface Sci 2007; 313:697-704. [PMID: 17561067 DOI: 10.1016/j.jcis.2007.05.027] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2006] [Revised: 04/30/2007] [Accepted: 05/04/2007] [Indexed: 11/22/2022]
Abstract
A new method has been developed to prepare smart copolymer microgels that consist of well defined temperature sensitive cores and pH sensitive shells. The microgels were obtained from N-isopropylacrylamide (NIPAAm) and acrylic acid (AAc), containing different mole ratios of AAc. Transmission electron micrographs of the microgels show that the colloidal copolymers are nearly monodisperse spheres (core-shell structures). The lower critical solution temperatures (LCSTs) (or phase separation temperatures) of the aqueous microgel solutions were measured by cloud-point method. At slight acidic conditions, the LCST decreased with increase in AAc content, which suggests that the hydrophobic group of NIPAAm has a greater influence on the LCST than the polar COOH group at those conditions. An increase of pH value leads to a significant increase in LCST due to the formation of a more hydrophilic copolymer. The LCST were studied as a function of copolymer composition over the pH range from 4.0 to 6.5. Because the pK(a) of the polymers can be tuned to fall close to neutral pH, these polymer compositions can be dispersed to have phase transitions triggered near physiological pH or at slight acidic pH values that fall within acidic gradients found in biology. Because of their stimuli-responsive behavior, these nanoscale materials are excellent candidates for biotechnology and biomedical applications where small changes in pH or temperature are of great consequence.
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Affiliation(s)
- Aslam Khan
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati 781 039, India.
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Huang X, Du F, Ju R, Li Z. Novel Acid-Labile, Thermoresponsive Poly(methacrylamide)s with PendentOrtho Ester Moieties. Macromol Rapid Commun 2007. [DOI: 10.1002/marc.200600798] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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45
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Cini R, Defazio S, Tamasi G, Casolaro M, Messori L, Casini A, Morpurgo M, Hursthouse M. fac-{Ru(CO)3}2+-Core Complexes and Design of Metal-Based Drugs. Synthesis, Structure, and Reactivity of Ru−Thiazole Derivative with Serum Proteins and Absorption−Release Studies with Acryloyl and Silica Hydrogels as Carriers in Physiological Media. Inorg Chem 2006; 46:79-92. [PMID: 17198415 DOI: 10.1021/ic060755s] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction of [Ru2(CO)6Cl4], 1, with excess THZ (1,3-thiazole) in absolute ethanol at 55 degrees C produces fac-[Ru(CO)3Cl2(THZ)], 2, in high yield. [Ru(CO)2Cl2(THZ)2], 3, is formed at higher temperature (ca 70 degrees C) and higher concentration of THZ. The X-ray structures of the new compounds have been determined, and density functional studies performed at the hybrid B3LYP/(Lanl2DZ, Ru; 6-311+G**, CHClNOS) level allowed the estimation of the structures of several conformers as well as that of their relative total electronic energies. Compound 2 is soluble (slowly) in aqueous media, where it reacts with the transport proteins bovine serum albumin (BSA) and human apotransferrin (HTF), and at a lower extent with calf thymus DNA (CT-DNA) and with guanosine-5'-monophosphate (GMP). The complex molecule is adsorbed by certain synthetic acryloyl polymers that have terminal carboxylate functions and is embedded in silica gels when these latter are prepared in the presence of a solution of 2. Ruthenium species are slowly released from the loaded gels into physiological solutions at pH 7.4. The reactivity of 2 with biomolecules and synthetic hydrogels makes it a compound of interest for anticancer and antimetastases tests.
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Affiliation(s)
- Renzo Cini
- Department of Chemical and Biosystem Sciences and Technologies, University of Siena, Via Aldo Moro 2, I-53100 Siena, Italy.
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Yin X, Hoffman AS, Stayton PS. Poly(N-isopropylacrylamide-co-propylacrylic acid) copolymers that respond sharply to temperature and pH. Biomacromolecules 2006; 7:1381-5. [PMID: 16677016 DOI: 10.1021/bm0507812] [Citation(s) in RCA: 280] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Temperature- and pH-sensitive random copolymers of N-isopropylacrylamide (NIPAAm) and propylacrylic acid (PAA) were prepared using the reversible addition fragmentation chain transfer (RAFT) polymerization method. The lower critical solution temperatures (LCSTs) (or phase separation temperatures) of the NIPAAm-co-PAA copolymer solutions were measured by the cloud-point method. At slightly acidic conditions, the LCST decreased with increase in PAA content, which suggests that the hydrophobic propyl group of PAA has a greater influence on the LCST than the polar carboxylic acid group at those conditions. An increase of pH led to a significant increase in LCST of the copolymers due to the ionization of the -COOH group. The LCSTs were studied as a function of copolymer composition over the pH range from 5.0 to 7.0. Because the pK(a) of the polymers can be tuned to fall close to neutral pH, these polymer compositions can be designed to have phase transitions triggered near physiological pH or at slightly acidic pH values that fall within acidic gradients found in biology. The NIPAAm-co-PAA copolymers thus display tunable properties that could make them useful in a variety of molecular switching and drug delivery applications where responses to small pH changes are relevant.
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Affiliation(s)
- Xiangchun Yin
- Department of Bioengineering, University of Washington, Seattle, Washington 98195, USA
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Casolaro M, Bottari S, Ito Y. Vinyl Polymers Based on l-Histidine Residues. Part 2. Swelling and Electric Behavior of Smart Poly(ampholyte) Hydrogels for Biomedical Applications. Biomacromolecules 2006; 7:1439-48. [PMID: 16677025 DOI: 10.1021/bm0509671] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Hydrogels based on the uncharged N-isopropylacrylamide and the ionic ampholyte N-acryloyl-L-histidine showed a reversible multiple-responsive volume change and volume phase transition behavior in aqueous solution. The phase transition phenomenon was induced by the temperature, the pH, the salt-type concentration, and the electric potential. The kind of cation (Na+, K+, Cs+, Mg2+, Ca2+, Sr2+) and anion (Cl-, ClO4-, NO3-, SO4(2-)) strongly influenced the critical concentration that improved the phase separation of the gels. The volume of the collapsed gel can be hundred times smaller than that of the swollen one. The oscillatory swelling of the gels in response to temperature and pH (4 and 9) changes was fast and reversible, while the contractile behavior in the electric field showed response only at pH 9, i.e., when the amount of negative charges on the L-histidine residues predominated. The electrically induced anisotropic gel deswelling was attributed to the syneresis of water from the gel. The nontoxicity against the RAW264 cell line and the low osmotic pressure exhibited by the swollen gels make these compounds useful scaffolds for human organs. The ability to load and release an ionizable drug molecular model (ferulic acid) from the hydrogels was shown also at different pH values.
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Affiliation(s)
- Mario Casolaro
- Dipartimento di Scienze e Tecnologie Chimiche e dei Biosistemi, Via Aldo Moro 2, Università degli Studi di Siena, I-53100 Siena, Italy.
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Corbini G, Martini S, Bonechi C, Casolaro M, Corti P, Rossi C. Synthetic polymers as biomacromolecular models for studying ligand–protein interactions: A nuclear spin relaxation approach. J Pharm Biomed Anal 2006; 40:113-21. [PMID: 16111852 DOI: 10.1016/j.jpba.2005.06.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2005] [Revised: 06/15/2005] [Accepted: 06/15/2005] [Indexed: 11/16/2022]
Abstract
In this paper, we applied an NMR methodology based on the analysis of selective spin-lattice relaxation rate enhancements of ligand protons induced by interaction processes between prednisolone and a synthetic copolymer, namely poly(N-isopropylacrylamide-co-N-acryloil-L-phenylalanine), in order to investigate this system as a model for studying drug-biomacromolecules interactions. The contribution from the bound ligand fraction to the observed relaxation rate in relation to macromolecule concentration allowed the calculation of the normalized affinity index [A(N)(I)](T)(L), in which the effects of motional anisotropies and different proton densities have been removed. This parameter, which represents the global affinity of the ligand towards the macromolecule, isolates the contribution due to a decrease in the ligand dynamics caused by the binding with the copolymer. The affinity index calculated for prednisolone-copolymer complex compared to that obtained for prednisolone-albumin system, suggested that synthetic polymers as models of biomacromolecules can play an important role in drug-protein interaction studies.
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Affiliation(s)
- Gianfranco Corbini
- Department of Pharmaceutical Chemistry, University of Siena, Via Aldo Moro, 2, Siena 53100, Italy.
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