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Bhosale M, Schmidt C, Penert P, Studer G, Esser B. Anion-Rocking Chair Batteries with Tuneable Voltage using Viologen- and Phenothiazine Polymer-based Electrodes. CHEMSUSCHEM 2024; 17:e202301143. [PMID: 37902416 DOI: 10.1002/cssc.202301143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 10/18/2023] [Accepted: 10/23/2023] [Indexed: 10/31/2023]
Abstract
Organic battery electrode materials offer the unique opportunity for full cells to operate in an anion-rocking chair mode. For this configuration a pair of p-type redox-active electrode materials is required with a substantial potential gap between their redox processes. We herein investigate viologen-functionalized polystyrenes as negative electrode paired with a phenothiazine polymer as positive electrode in all-organic full cells. The 10 % crosslinked viologen polymer X10 -PVBV gave better performance than the linear PVBV and was employed in a full cell as negative electrode with cross-linked poly(3-vinyl-N-methylphenothiazine) (X-PVMPT) as positive electrode. Three cell configurations regarding the voltage range were investigated, of which one with an operating potential of 0.9 V gave the highest performance. The full cell delivered a specific discharge capacity of 64 mA h g-1 (of X-PVMPT) in the first cycle and a capacity retention of 79 % after 100 cycles. This is one of only few reported anion rocking chair all-organic cells and the first employing a phenothiazine-based positive electrode material.
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Affiliation(s)
- Manik Bhosale
- Institute of Organic Chemistry II and Advanced Materials, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Caroline Schmidt
- Institute of Organic Chemistry, University of Freiburg, Albertstr. 21, 79104, Freiburg, Germany
| | - Philipp Penert
- Institute of Organic Chemistry II and Advanced Materials, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Gauthier Studer
- Institute of Organic Chemistry II and Advanced Materials, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Birgit Esser
- Institute of Organic Chemistry II and Advanced Materials, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
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2
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Xu J, Deng Z, Wu B, Lin M, Chen D. Synthesis and characterization of viologen functionalized fluorene-containing poly(arylene ether ketone)s for polymer batteries. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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3
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Kashapov R, Razuvayeva Y, Ziganshina A, Sapunova A, Lyubina A, Amerhanova S, Kulik N, Voloshina A, Nizameev I, Salnikov V, Zakharova L. Effect of preorganization and amphiphilicity of calix[4]arene platform on functional properties of viologen derivatives. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.117801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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4
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Zhu N, Zhang Y, Cheng J, Mao Y, Kang K, Li G, Yi Q, Wu Y. Immuno-affinitive supramolecular magnetic nanoparticles incorporating cucurbit[8]uril-mediated ternary host-guest complexation structures for high-efficient small extracellular vesicle enrichment. J Colloid Interface Sci 2021; 611:462-471. [PMID: 34968965 DOI: 10.1016/j.jcis.2021.12.109] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 11/27/2021] [Accepted: 12/16/2021] [Indexed: 12/30/2022]
Abstract
Enriching small extracellular vesicles (sEVs) with undamaged structure and function is a pivotal step for further applications in biological and clinical fields. It has prompted researchers to explore a carrier material that can efficiently capture sEVs while also gently release the captured sEVs. Here, 1-adamantylamine (1-ADA) responsive immuno-affinitive supramolecular magnetic nanoparticles (ISM-NPs) incorporating ternary host-guest complexation structures mediated by CB[8] were proposed to achieved the goal. In particular, the ternary host-guest complexation was constructed by the host molecule (cucurbit[8]uril, CB[8]) mediated assembly of two guest molecules (naphthol and bipyridine), and served as a cleavable bridge to connect the magnetic core and peripheral antibody. These constructed ISM-NPs performed well in the applications of capturing sEVs with a high capture efficiency of 85.5%. Further, the CB[8]-mediated ternary host-guest complexation structures can be disassembled with addition of the 1-ADA. Thus, the sEVs recognized by the anti-CD63 were released competitively, with a decent release efficiency more than 82%. The released sEVs kept intact morphology and exhibited appropriate size distribution and concentration. This supramolecular magnetic system, with 1-ADA responsive ternary host-guest complexation structures, may contribute to efficient enrichment of any other biomarkers, likely cells, proteins, peptides, etc.
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Affiliation(s)
- Nanhang Zhu
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, PR China; College of Biomedical Engineering, Sichuan University, Chengdu 610064, PR China
| | - Yujia Zhang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, PR China; College of Biomedical Engineering, Sichuan University, Chengdu 610064, PR China
| | - Jia Cheng
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, PR China; College of Biomedical Engineering, Sichuan University, Chengdu 610064, PR China
| | - Yanchao Mao
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, PR China; College of Biomedical Engineering, Sichuan University, Chengdu 610064, PR China
| | - Ke Kang
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, PR China; College of Biomedical Engineering, Sichuan University, Chengdu 610064, PR China
| | - Guohao Li
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, PR China; College of Biomedical Engineering, Sichuan University, Chengdu 610064, PR China
| | - Qiangying Yi
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, PR China; College of Biomedical Engineering, Sichuan University, Chengdu 610064, PR China.
| | - Yao Wu
- National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, PR China; College of Biomedical Engineering, Sichuan University, Chengdu 610064, PR China.
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5
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Moreno A, Pitoc GA, Ganson NJ, Layzer JM, Hershfield MS, Tarantal AF, Sullenger BA. Anti-PEG Antibodies Inhibit the Anticoagulant Activity of PEGylated Aptamers. Cell Chem Biol 2019; 26:634-644.e3. [PMID: 30827937 PMCID: PMC6707742 DOI: 10.1016/j.chembiol.2019.02.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Revised: 12/17/2018] [Accepted: 01/31/2019] [Indexed: 02/06/2023]
Abstract
Biopharmaceuticals have become increasingly attractive therapeutic agents and are often PEGylated to enhance their pharmacokinetics and reduce their immunogenicity. However, recent human clinical trials have demonstrated that administration of PEGylated compounds can evoke anti-PEG antibodies. Considering the ubiquity of PEG in commercial products and the presence of pre-existing anti-PEG antibodies in patients in large clinical trials evaluating a PEG-modified aptamer, we investigated how anti-PEG antibodies effect the therapeutic activities of PEGylated RNA aptamers. We demonstrate that anti-PEG antibodies can directly bind to and inhibit anticoagulant aptamer function in vitro and in vivo. Moreover, in parallel studies we detected the presence of anti-PEG antibodies in nonhuman primates after a single administration of a PEGylated aptamer. Our results suggest that anti-PEG antibodies can limit the activity of PEGylated drugs and potentially compromise the activity of otherwise effective therapeutic agents.
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Affiliation(s)
- Angelo Moreno
- Department of Molecular Genetics and Microbiology graduate program, Duke University, Durham, NC, USA,Department of Surgery, Duke University, Durham, NC, USA
| | | | - Nancy J. Ganson
- Department of Medicine, Duke University Medical Center, Durham, NC, USA
| | - Juliana M. Layzer
- Department of Surgery, Duke University, Durham, NC, USA,Duke Clinical and Translational Science Institute, Durham, NC, USA
| | | | - Alice F. Tarantal
- Departments of Pediatrics and Cell Biology and Human Anatomy, School of Medicine, NHLBI Center for Gene Transfer for Heart, Lung, and Blood Disease, and California National Primate Research Center, University of California, Davis, CA, USA
| | - Bruce A. Sullenger
- Department of Molecular Genetics and Microbiology graduate program, Duke University, Durham, NC, USA,Department of Surgery, Duke University, Durham, NC, USA,Contact Info: Corresponding Author and Lead Contact:
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6
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Kashapov RR, Razuvayeva YS, Ziganshina AY, Mukhitova RK, Sapunova AS, Voloshina AD, Zakharova LY. Self-assembling and biological properties of single-chain dicationic pyridinium-based surfactants. Colloids Surf B Biointerfaces 2018; 175:351-357. [PMID: 30554013 DOI: 10.1016/j.colsurfb.2018.12.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 11/30/2018] [Accepted: 12/05/2018] [Indexed: 12/14/2022]
Abstract
In this work, the dicationic surfactants containing viologen and vinylbipyridinium moieties and hexadecyl chains were synthesized, and their aggregation behavior in water solutions was investigated by surface tension, conductivity measurements, hydrophobic probe solubilization, dynamic light scattering and electrophoretic measurements. Effect of UV-light on cis-trans isomerism of vinylbipyridinium derivative was determined. Antimicrobial activity and the influence of these surfactants on cell viability depended on the concentration and type of surfactant used. The results obtained established the structure-property (physicochemical properties and biological activity) relationship of the surfactant molecule namely the primary role of pyridinium head group structure.
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Affiliation(s)
- Ruslan R Kashapov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., Kazan, 420088, Russia; Kazan National Research Technological University, 68 K. Marks str., Kazan, 420015, Russia.
| | - Yuliya S Razuvayeva
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., Kazan, 420088, Russia; Kazan National Research Technological University, 68 K. Marks str., Kazan, 420015, Russia
| | - Albina Y Ziganshina
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., Kazan, 420088, Russia
| | - Rezeda K Mukhitova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., Kazan, 420088, Russia
| | - Anastasiya S Sapunova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., Kazan, 420088, Russia
| | - Alexandra D Voloshina
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., Kazan, 420088, Russia
| | - Lucia Y Zakharova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, 8 Arbuzov str., Kazan, 420088, Russia; Kazan National Research Technological University, 68 K. Marks str., Kazan, 420015, Russia
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7
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Datta S, Saha ML, Lahiri N, Yu G, Louie J, Stang PJ. Hierarchical Self-Assembly of a Water-Soluble Organoplatinum(II) Metallacycle into Well-Defined Nanostructures. Org Lett 2018; 20:7020-7023. [PMID: 30371089 PMCID: PMC6385591 DOI: 10.1021/acs.orglett.8b02925] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A water-soluble metallosupramolecular hexagon containing pendant methyl viologen (MV) and trimethylammonium units at the vertices has been synthesized via an organoplatinum(II) ← pyridyl coordination-driven self-assembly reaction. The MV units of the metallacycle were further utilized in the formation of a heteroternary complex with cucurbit[8]uril and a galactose-functionalized naphthalene derivative, yielding a metallacycle-cored carbohydrate cluster that was subsequently ordered into nanospheres and tapes, depending upon the concentration.
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Affiliation(s)
- Sougata Datta
- Department of Chemistry , University of Utah , 315 South 1400 East, Room 2020 , Salt Lake City , Utah 84112 , United States
| | - Manik Lal Saha
- Department of Chemistry , University of Utah , 315 South 1400 East, Room 2020 , Salt Lake City , Utah 84112 , United States
| | - Nabajit Lahiri
- Department of Chemistry , University of Utah , 315 South 1400 East, Room 2020 , Salt Lake City , Utah 84112 , United States
| | - Guocan Yu
- State Key Laboratory of Chemical Engineering, Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry , Zhejiang University , Hangzhou 310027 , P. R. China
| | - Janis Louie
- Department of Chemistry , University of Utah , 315 South 1400 East, Room 2020 , Salt Lake City , Utah 84112 , United States
| | - Peter J Stang
- Department of Chemistry , University of Utah , 315 South 1400 East, Room 2020 , Salt Lake City , Utah 84112 , United States
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8
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Stavra E, Petrou PS, Koukouvinos G, Kiritsis C, Pirmettis I, Papadopoulos M, Goustouridis D, Economou A, Misiakos K, Raptis I, Kakabakos SE. Simultaneous determination of paraquat and atrazine in water samples with a white light reflectance spectroscopy biosensor. JOURNAL OF HAZARDOUS MATERIALS 2018; 359:67-75. [PMID: 30014916 DOI: 10.1016/j.jhazmat.2018.07.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 07/04/2018] [Accepted: 07/06/2018] [Indexed: 05/27/2023]
Abstract
An optical immunosensor based on White Light Reflectance Spectroscopy for the simultaneous determination of the herbicides atrazine and paraquat in drinking water samples is demonstrated. The biosensor allows for the label-free real-time monitoring of biomolecular interactions taking place onto a SiO2/Si chip by transforming the shift in the reflected interference spectrum due to reaction to effective biomolecular layer thickness. Dual-analyte determination is accomplished by functionalizing spatially distinct areas of the chip with protein conjugates of the two herbicides and scanning the surface with an optical reflection probe. A competitive immunoassay format was adopted, followed by reaction with secondary antibodies for signal enhancement. The sensor was highly sensitive with detection limits of 40 and 50 pg/mL for paraquat and atrazine, respectively, and the assay duration was 12 min. Recovery values ranging from 90.0 to 110% were determined for the two pesticides in spiked bottled and tap water samples, demonstrating the sensor accuracy. In addition, the sensor could be regenerated and re-used at least 20 times without significant effect on the assay characteristics. Its excellent analytical performance and short analysis time combined with the small sensor size should be helpful for fast on-site determinations of these analytes.
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Affiliation(s)
- Eleftheria Stavra
- Immunoassays-Immunosensors Lab, INRASTES, NCSR "Demokritos", 15341 Aghia Paraskevi, Greece; Analytical Chemistry Lab, Department of Chemistry, University of Athens, Panepistimiopolis, 15771 Zografou, Greece
| | - Panagiota S Petrou
- Immunoassays-Immunosensors Lab, INRASTES, NCSR "Demokritos", 15341 Aghia Paraskevi, Greece.
| | - Georgios Koukouvinos
- Immunoassays-Immunosensors Lab, INRASTES, NCSR "Demokritos", 15341 Aghia Paraskevi, Greece
| | - Christos Kiritsis
- Radiopharmaceuticals Lab, INRASTES, NCSR "Demokritos", 15341 Aghia Paraskevi, Greece
| | - Ioannis Pirmettis
- Radiopharmaceuticals Lab, INRASTES, NCSR "Demokritos", 15341 Aghia Paraskevi, Greece
| | - Minas Papadopoulos
- Radiopharmaceuticals Lab, INRASTES, NCSR "Demokritos", 15341 Aghia Paraskevi, Greece
| | - Dimitrios Goustouridis
- ThetaMetrisis S.A., Polydefkous 14, 12243 Egaleo, Greece; Electronics Department, TEI of Piraeus, 12244 Egaleo, Greece
| | - Anastasios Economou
- Analytical Chemistry Lab, Department of Chemistry, University of Athens, Panepistimiopolis, 15771 Zografou, Greece
| | - Konstantinos Misiakos
- Institute of Nanoscience & Nanotechnology, NCSR "Demokritos", 15341 Aghia Paraskevi, Greece
| | - Ioannis Raptis
- ThetaMetrisis S.A., Polydefkous 14, 12243 Egaleo, Greece
| | - Sotirios E Kakabakos
- Immunoassays-Immunosensors Lab, INRASTES, NCSR "Demokritos", 15341 Aghia Paraskevi, Greece.
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9
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Cui JQ, Guo TS, Chu KB, Wu C, Yang G, Song JL, Zhang C. In situ Alkylation of 4,4′-Vinylenedipyridine for Inorganic-Organic Iodides/Iodidomercurates. Z Anorg Allg Chem 2017. [DOI: 10.1002/zaac.201600431] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jian-Qiu Cui
- China-Australia Joint Research Center for Functional Molecular Materials; School of Chemical and Material Engineering; Jiangnan University; 214122 Wuxi P. R. China
| | - Tian-Shuo Guo
- China-Australia Joint Research Center for Functional Molecular Materials; School of Chemical and Material Engineering; Jiangnan University; 214122 Wuxi P. R. China
| | - Kai-Bin Chu
- China-Australia Joint Research Center for Functional Molecular Materials; School of Chemical and Material Engineering; Jiangnan University; 214122 Wuxi P. R. China
| | - Chao Wu
- China-Australia Joint Research Center for Functional Molecular Materials; School of Chemical and Material Engineering; Jiangnan University; 214122 Wuxi P. R. China
| | - Gang Yang
- China-Australia Joint Research Center for Functional Molecular Materials; School of Chemical and Material Engineering; Jiangnan University; 214122 Wuxi P. R. China
| | - Jun-Ling Song
- China-Australia Joint Research Center for Functional Molecular Materials; School of Chemical and Material Engineering; Jiangnan University; 214122 Wuxi P. R. China
| | - Chi Zhang
- China-Australia Joint Research Center for Functional Molecular Materials; School of Chemical and Material Engineering; Jiangnan University; 214122 Wuxi P. R. China
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10
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Gayathri CH, Sankaran S, Shah JH, Sankaran K. Ultrasensitive and unambiguous bacterial pathogen detection through super selective interactions between multivalent supramolecular immuno-nanoparticles (SINs). RSC Adv 2016. [DOI: 10.1039/c6ra03117j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
We have developed a rapid, cost-effective, ultrasensitive and unambiguous pathogen detection technique using multivalent supramolecular interactions between immuno-nanoparticles.
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Affiliation(s)
| | | | - Juhi H. Shah
- Centre for Biotechnology
- Anna University
- Chennai
- India
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11
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Li DD, Ren KF, Chang H, Wang HB, Wang JL, Chen CJ, Ji J. Cucurbit[8]uril supramolecular assembly for positively charged ultrathin films as nanocontainers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:14101-14107. [PMID: 24147652 DOI: 10.1021/la4033332] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The design of positively charged ultrathin films for surface modification is of crucial importance for biomedical applications. Herein, we report the layer-by-layer assembly of pure positively charged ultrathin films based on the host-guest interaction of cucurbit[8]uril (CB[8]). Two positively charged poly(ethylenimine)s (PEI) functionalized with guest moieties methyl viologen (MV) and indole (ID) were alternately assembled with the formation of CB[8] ternary complex under basic conditions. The growth of the (PEI-MV@CB[8]/PEI-ID) films was monitored by spectroscopic ellipsometry and quartz crystal microbalance. The morphology and structure of the films were characterized by scanning electron microscopy and UV-vis spectroscopy, respectively. These positively charged (PEI-MV@CB[8]/PEI-ID) films were very stable in the pH range from 4 to 9 but disassembled immediately when subjected to a competitive guest adamantylamine. Finally, the films were successfully employed as nanocontainers for DNA loading and subsequent directing the transfection of the adhered cells.
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Affiliation(s)
- Dan-dan Li
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University , Hangzhou, China
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12
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Affiliation(s)
- F. J. Xu
- State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, College of Materials Science & Engineering, Beijing University of Chemical Technology, Beijing 100029 China
| | - F. B. Su
- State Key Laboratory of Multi-phase Complex System, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China 100190
| | - S. B. Deng
- Department of Environmental Science and Engineering, Tsinghua University, Beijing, 100084 China
| | - W. T. Yang
- State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, College of Materials Science & Engineering, Beijing University of Chemical Technology, Beijing 100029 China
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13
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Bastings MMC, de Greef TFA, van Dongen JLJ, Merkx M, Meijer EW. Macrocyclization of enzyme-based supramolecular polymers. Chem Sci 2010. [DOI: 10.1039/c0sc00108b] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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14
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15
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Berry RE, Shokhireva TK, Filippov I, Shokhirev MN, Zhang H, Walker FA. Effect of the N-terminus on heme cavity structure, ligand equilibrium, rate constants, and reduction potentials of nitrophorin 2 from Rhodnius prolixus. Biochemistry 2007; 46:6830-43. [PMID: 17506528 PMCID: PMC2518688 DOI: 10.1021/bi7002263] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The D1A mutant of recombinant NP2 has been prepared and shown to have the expression-initiation methionine-0 cleaved during expression in E. coli, as is the case for recombinant NP4, where Ala is the first amino acid for the recombinant protein as well as for the mature native protein. The heme substituent 1H NMR chemical shifts of NP2-D1A and those of its imidazole, N-methylimidazole, and cyanide complexes are rather different from those of NP2-M0D1. This difference is likely due to the much smaller size of the N-terminal amino acid (A) of NP2-D1A, which allows the formation of the closed loop form of this protein, as it does for NP4 (Weichsel, A., Andersen, J. F., Roberts, S. A., and Montfort, W. R. (2000) Nature Struct. Biol. 7, 551-554). The ratio of the two hemin rotational isomers A and B is different for the two proteins, and the rate at which the A:B ratio reaches equilibrium is strikingly different (NP2-M0D1 t1/2 for heme rotation approximately 2 h, NP2-D1A t1/2 approximately 43 h). This difference is consistent with the high stability of the closed loop form of the NP2-D1A protein and infrequent opening of the loops that could allow heme to at least partially exit the binding pocket in order to rotate about its alpha,gamma-meso axis. Consistent with this, the rates of histamine binding and release to/from NP2-D1A are significantly slower than those for NP2-M0D1 at pH 7.5. This work suggests that care must be taken in interpreting data obtained from proteins that carry the expression-initiation M0.
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Affiliation(s)
- Robert E Berry
- Department of Chemistry, The University of Arizona, P.O. Box 210041, Tucson, Arizona 85721-0041, USA
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16
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Liang L, Yao P, Jiang M, Zhang G, Yan Y. Interactions of apo cytochrome C with alternating copolymers of maleic acid and alkene. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:10662-70. [PMID: 16262334 DOI: 10.1021/la050973i] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Apo cytochrome c (apo cyt c) tends to aggregate at alkali pH. Poly(isobutylene-alt-maleic acid) (PIMA) is soluble molecularly, whereas poly(1-tetradecene-alt-maleic acid) (PTMA) forms particles that tend to dissociate by increasing pH and decreasing concentration. Dynamic light scattering and surface plasmon resonance are used to investigate the interactions of PIMA and PTMA with apo cyt c at different pH values to understand the mechanism of the interactions. When the positive or negative charges are in excess, the copolymer-protein complex particles can be stabilized by the charges on the surface. When the ratio of the positive to negative charges is close to the stoichiometric value, precipitation occurs. At pH 11.8, both PTMA and apo cyt c carry negative charges, but the hydrophobic interaction makes them form complexes. A competition exists between the interaction of the copolymer with apo cyt c and the self-aggregation of PTMA or apo cyt c alone. The interaction of PIMA or PTMA with apo cyt c at neutral and alkali pH destroys the aggregation of PTMA or apo cyt c and forms new complex particles.
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Affiliation(s)
- Li Liang
- Department of Macromolecular Science, Fudan University, Shanghai, China
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17
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Shi Z, Neoh KG, Kang ET. Antibacterial activity of polymeric substrate with surface grafted viologen moieties. Biomaterials 2005; 26:501-8. [PMID: 15276358 DOI: 10.1016/j.biomaterials.2004.02.060] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2003] [Accepted: 02/24/2004] [Indexed: 10/26/2022]
Abstract
An asymmetric viologen, N-hexyl-N'-(4-vinylbenzyl)-4,4'-bipyridinium bromide chloride (HVV), was synthesized and graft copolymerized with commercial PET films. The surface graft concentration of HVV on the PET film is easily controlled by varying the monomer concentration used in the UV-induced graft copolymerization process. The HVV surface functionalized PET film functions as a smart window whose transmittance is reduced upon exposure to light. Concomitantly, the film possesses antibacterial activity, as shown by its bactericidal effect on Escherichia coli (E. coli). The antibacterial activity depends on the concentration of pyridinium groups on the surface and a surface concentration of 25 nmol/cm2 on PET has been shown to be highly effective in killing the bacteria.
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Affiliation(s)
- Zhilong Shi
- Department of Chemical and Environmental Engineering, National University of Singapore, Kent Ridge, Singapore 119260, Singapore
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18
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Rich RL, Myszka DG. A survey of the year 2002 commercial optical biosensor literature. J Mol Recognit 2004; 16:351-82. [PMID: 14732928 DOI: 10.1002/jmr.649] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
We have compiled 819 articles published in the year 2002 that involved commercial optical biosensor technology. The literature demonstrates that the technology's application continues to increase as biosensors are contributing to diverse scientific fields and are used to examine interactions ranging in size from small molecules to whole cells. Also, the variety of available commercial biosensor platforms is increasing and the expertise of users is improving. In this review, we use the literature to focus on the basic types of biosensor experiments, including kinetics, equilibrium analysis, solution competition, active concentration determination and screening. In addition, using examples of particularly well-performed analyses, we illustrate the high information content available in the primary response data and emphasize the impact of including figures in publications to support the results of biosensor analyses.
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Affiliation(s)
- Rebecca L Rich
- Center for Biomolecular Interaction Analysis, University of Utah, Salt Lake City, UT 84132, USA
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He L, Smith EA, Natan MJ, Keating CD. The Distance-Dependence of Colloidal Au-Amplified Surface Plasmon Resonance. J Phys Chem B 2004. [DOI: 10.1021/jp048536k] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Lin He
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802-6300
| | - Emily A. Smith
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802-6300
| | - Michael J. Natan
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802-6300
| | - Christine D. Keating
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802-6300
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Berry RE, Ding XD, Shokhireva TK, Weichsel A, Montfort WR, Walker FA. Axial ligand complexes of the Rhodnius nitrophorins: reduction potentials, binding constants, EPR spectra, and structures of the 4-iodopyrazole and imidazole complexes of NP4. J Biol Inorg Chem 2003; 9:135-44. [PMID: 14673714 DOI: 10.1007/s00775-003-0505-0] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2003] [Accepted: 10/16/2003] [Indexed: 10/26/2022]
Abstract
Previously, we utilized 4-iodopyrazole (4IPzH) as a heavy atom derivative for the initial solution of the crystal structure of the nitrophorin from Rhodnius prolixus, NP1, where it was found to bind to the heme with the iodo group disordered in two positions. We have now determined the structure of the 4IPzH complex of NP4 at pH 7.5 and find that the geometry and bond lengths at the iron center are extremely similar to those of the imidazole (ImH) complex of the same protein (structure determined at pH 5.6), except that the G-H loop is not in the closed conformation. 4IPzH binds to the heme of NP4 in an ordered manner, with the iodo substituent pointed toward the opening of the heme pocket, near the surface of the protein. In order to understand the solution chemistry in terms of the relative binding abilities of 4IPzH, ImH, and histamine (Hm, a physiological ligand for the nitrophorins), we have also investigated the equilibrium binding constants and reduction potentials of these three ligand complexes of the four Rhodnius nitrophorins as a function of pH. We have found that, unlike the other Lewis bases, 4IPzH forms less stable complexes with the Fe(III) than the Fe(II) oxidation states of NP1 and NP4, and similar stability for the two oxidation states of NP2 and NP3, suggesting that this ligand is a softer base than ImH or Hm, for both of which the Fe(III) complexes are more stable than those of Fe(II) for all four nitrophorins. Surprisingly, in spite of this and the much lower basicity of 4IPzH than imidazole and histamine, the EPR g-values of all three ligand complexes are very similar.
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Affiliation(s)
- Robert E Berry
- Department of Chemistry, University of Arizona, Tucson, AZ 85721, USA
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