1
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Rubio N, Suter T, Rana Z, Clancy AJ, Masuda S, Au H, Coulter G, Sirisinudomkit P, McMillan PF, Howard CA, Mattevi C, Brett DJL, Shaffer MSP. Platinum deposition on functionalised graphene for corrosion resistant oxygen reduction electrodes. JOURNAL OF MATERIALS CHEMISTRY. A 2022; 10:20121-20127. [PMID: 36277421 PMCID: PMC9514556 DOI: 10.1039/d2ta03487e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 08/20/2022] [Indexed: 06/16/2023]
Abstract
Graphene-related materials are promising supports for electrocatalysts due to their stability and high surface area. Their innate surface chemistries can be controlled and tuned via functionalisation to improve the stability of both the carbon support and the metal catalyst. Functionalised graphenes were prepared using either aryl diazonium functionalisation or non-destructive chemical reduction, to provide groups adapted for platinum deposition. XPS and TGA-MS measurements confirmed the presence of polyethyleneglycol and sulfur-containing functional groups, and provided consistent values for the extent of the reactions. The deposited platinum nanoparticles obtained were consistently around 2 nm via reductive chemistry and around 4 nm via the diazonium route. Although these graphene-supported electrocatalysts provided a lower electrochemical surface area (ECSA), functionalised samples showed enhanced specific activity compared to a commercial platinum/carbon black system. Accelerated stress testing (AST) showed improved durability for the functionalised graphenes compared to the non-functionalised materials, attributed to edge passivation and catalyst particle anchoring.
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Affiliation(s)
- Noelia Rubio
- Department of Organic and Inorganic Chemistry, University of Alcala Madrid 28802 Spain
- Department of Chemistry, MSRH, Imperial College London W12 0BZ UK
| | - Theo Suter
- Electrochemical Innovation Lab, Department of Chemical Engineering, University College London London WC1H 0AJ UK
| | - Zahra Rana
- Electrochemical Innovation Lab, Department of Chemical Engineering, University College London London WC1H 0AJ UK
| | - Adam J Clancy
- Department of Chemical Engineering, Imperial College London London SW7 2AZ UK
- Department of Chemistry, University College London London WC1H 0AJ UK
| | - Seigo Masuda
- Department of Materials, Imperial College London SW7 2AZ UK
| | - Heather Au
- Department of Chemical Engineering, Imperial College London London SW7 2AZ UK
| | - Gabriel Coulter
- Department of Chemistry, MSRH, Imperial College London W12 0BZ UK
| | - Pichamon Sirisinudomkit
- Department of Chemistry, MSRH, Imperial College London W12 0BZ UK
- Department of Mining and Materials Engineering, Faculty of Engineering, Prince of Songkla University Hat Yai 90110 Songkhla Thailand
| | - Paul F McMillan
- Department of Chemistry, University College London London WC1H 0AJ UK
| | - Christopher A Howard
- Department of Physics and Astronomy, University College London London WC1H 0AJ UK
| | | | - Dan J L Brett
- Electrochemical Innovation Lab, Department of Chemical Engineering, University College London London WC1H 0AJ UK
| | - Milo S P Shaffer
- Department of Chemistry, MSRH, Imperial College London W12 0BZ UK
- Department of Materials, Imperial College London SW7 2AZ UK
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2
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Zaghmi A, Greschner AA, Mendez-Villuendas E, Liu JY, de Haan HW, Gauthier MA. Determination of the degree of PEGylation of protein bioconjugates using data from proton nuclear magnetic resonance spectroscopy. Data Brief 2019; 25:104037. [PMID: 31223640 PMCID: PMC6565728 DOI: 10.1016/j.dib.2019.104037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 04/25/2019] [Accepted: 05/15/2019] [Indexed: 11/26/2022] Open
Abstract
The average number of methoxy poly(ethylene glycol) (mPEG) chains grafted to a protein - also known as the degree of PEGylation - is a fundamental parameter for characterizing a bioconjugate. The degree of PEGylation is typically determined by chromatographic or electrophoretic methods, which are subject to certain biases. This contribution describes an analytical approach alongside technical precautions for quantitatively determining the degree of PEGylation of protein bioconjugates by 1H NMR spectroscopy. An accompanying dataset, corresponding to the raw 1H NMR spectra of thirteen bioconjugates with different degrees of PEGylation and different mPEG molecular weights, is provided for the reader to become familiar with the analysis. The exemplary bioconjugate system used in this Data article is the enzyme glutamate dehydrogenase (GDH) modified with multiple copies of mPEG (0.5-20 kDa). These bioconjugates correspond to those discussed in-depth in the article "Mechanisms of activity loss for a multi-PEGylated protein by experiment and simulation" by Zaghmi et al., 2019 The described approach to calculate degree of PEGylation is quantitative, applicable to other proteins, and can be adapted to other types of polymers.
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Affiliation(s)
- Ahlem Zaghmi
- Institut National de la Recherche Scientifique (INRS), EMT Research Center, Varennes, QC, J3X 1S2, Canada
| | - Andrea A Greschner
- Institut National de la Recherche Scientifique (INRS), EMT Research Center, Varennes, QC, J3X 1S2, Canada
| | | | - Jun Yang Liu
- Institut National de la Recherche Scientifique (INRS), EMT Research Center, Varennes, QC, J3X 1S2, Canada
| | - Hendrick W de Haan
- University of Ontario Institute of Technology, Faculty of Science, Oshawa, Ontario, L1H 7K4, Canada
| | - Marc A Gauthier
- Institut National de la Recherche Scientifique (INRS), EMT Research Center, Varennes, QC, J3X 1S2, Canada
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3
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One-pot synthesis of glycosyl phenylthiosulfonates from sulfinate, S and glycosyl bromides. Carbohydr Res 2019; 471:1-5. [PMID: 30399452 DOI: 10.1016/j.carres.2018.10.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2018] [Revised: 10/18/2018] [Accepted: 10/18/2018] [Indexed: 01/17/2023]
Abstract
Glycosyl phenylthiosulfonates are reagents which are valuable for the S-glycosylation decoration of organic compounds and proteins. Here, one-pot multiple-component synthesis of glycosyl phenylthiosulfonates from sulfinate, sulfur powder and glycosyl bromides is reported. The reactions afford glycosyl phenylthiosulfonates in good yields under mild conditions. Further application and exploration of glycosyl phenylthiosulfonates are still on underway in our group.
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4
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Affiliation(s)
- Yanjing Wang
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Chi Wu
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
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5
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Zhou H, Chen Y, Plummer CM, Huang H, Chen Y. Facile and efficient bromination of hydroxyl-containing polymers to synthesize well-defined brominated polymers. Polym Chem 2017. [DOI: 10.1039/c7py00283a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This article demonstrates a new post-modification method to synthesize well-defined brominated polymers based on the bromination of hydroxyl-containing polymers.
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Affiliation(s)
- Houbo Zhou
- Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education
- School of Materials Science and Engineering
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Yi Chen
- Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education
- School of Materials Science and Engineering
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Christopher M. Plummer
- Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education
- School of Materials Science and Engineering
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Huahua Huang
- Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education
- School of Materials Science and Engineering
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Yongming Chen
- Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education
- School of Materials Science and Engineering
- Sun Yat-sen University
- Guangzhou 510275
- China
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6
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Leese HS, Govada L, Saridakis E, Khurshid S, Menzel R, Morishita T, Clancy AJ, White ER, Chayen NE, Shaffer MSP. Reductively PEGylated carbon nanomaterials and their use to nucleate 3D protein crystals: a comparison of dimensionality. Chem Sci 2016; 7:2916-2923. [PMID: 30090285 PMCID: PMC6054039 DOI: 10.1039/c5sc03595c] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 01/17/2016] [Indexed: 12/18/2022] Open
Abstract
A range of carbon nanomaterials, with varying dimensionality, were dispersed by a non-damaging and versatile chemical reduction route, and subsequently grafted by reaction with methoxy polyethylene glycol (mPEG) monobromides. The use of carbon nanomaterials with different geometries provides both a systematic comparison of surface modification chemistry and the opportunity to study factors affecting specific applications. Multi-walled carbon nanotubes, single-walled carbon nanotubes, graphite nanoplatelets, exfoliated few layer graphite and carbon black were functionalized with mPEG-Br, yielding grafting ratios relative to the nanocarbon framework between ca. 7 and 135 wt%; the products were characterised by Raman spectroscopy, TGA-MS, and electron microscopy. The functionalized materials were tested as nucleants by subjecting them to rigorous protein crystallization studies. Sparsely functionalized flat sheet geometries proved exceptionally effective at inducing crystallization of six proteins. This new class of nucleant, based on PEG grafted graphene-related materials, can be widely applied to promote the growth of 3D crystals suitable for X-ray crystallography. The association of the protein ferritin with functionalized exfoliated few layer graphite was directly visualized by transmission electron microscopy, illustrating the formation of ordered clusters of protein molecules critical to successful nucleation.
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Affiliation(s)
- Hannah S Leese
- Department of Chemistry , Imperial College London , London SW7 2AZ , UK .
| | - Lata Govada
- Computational and Systems Medicine , Department of Surgery and Cancer , Imperial College London , London SW7 2AZ , UK .
| | - Emmanuel Saridakis
- Laboratory of Structural and Supramolecular Chemistry , Institute of Nanoscience and Nanotechnology , National Centre for Scientific Research 'Demokritos' , Athens , Greece
| | - Sahir Khurshid
- Computational and Systems Medicine , Department of Surgery and Cancer , Imperial College London , London SW7 2AZ , UK .
| | - Robert Menzel
- Department of Chemistry , Imperial College London , London SW7 2AZ , UK .
| | - Takuya Morishita
- Department of Chemistry , Imperial College London , London SW7 2AZ , UK .
- Toyota Central R&D Labs., Inc. , Nagakute , Aichi 480-1192 , Japan
| | - Adam J Clancy
- Department of Chemistry , Imperial College London , London SW7 2AZ , UK .
| | - Edward R White
- Department of Chemistry , Imperial College London , London SW7 2AZ , UK .
| | - Naomi E Chayen
- Computational and Systems Medicine , Department of Surgery and Cancer , Imperial College London , London SW7 2AZ , UK .
| | - Milo S P Shaffer
- Department of Chemistry , Imperial College London , London SW7 2AZ , UK .
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7
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Gunnoo SB, Madder A. Chemical Protein Modification through Cysteine. Chembiochem 2016; 17:529-53. [DOI: 10.1002/cbic.201500667] [Citation(s) in RCA: 242] [Impact Index Per Article: 30.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Indexed: 12/15/2022]
Affiliation(s)
- Smita B. Gunnoo
- Organic & Biomimetic Chemistry Research Group; Department of Organic and Macromolecular Chemistry; Ghent University; Krijgslaan 281 9000 Gent Belgium
| | - Annemieke Madder
- Organic & Biomimetic Chemistry Research Group; Department of Organic and Macromolecular Chemistry; Ghent University; Krijgslaan 281 9000 Gent Belgium
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8
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Gunnoo SB, Madder A. Bioconjugation – using selective chemistry to enhance the properties of proteins and peptides as therapeutics and carriers. Org Biomol Chem 2016; 14:8002-13. [DOI: 10.1039/c6ob00808a] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Both peptide and protein therapeutics are becoming increasingly important for treating a wide range of diseases. Functionalisation of theseviasite-selective chemical modification leads to enhancement of their therapeutic properties.
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Affiliation(s)
- Smita B. Gunnoo
- Organic and Biomimetic Chemistry Research Group
- Department of Organic and Macromolecular Chemistry
- Ghent University
- Ghent
- Belgium
| | - Annemieke Madder
- Organic and Biomimetic Chemistry Research Group
- Department of Organic and Macromolecular Chemistry
- Ghent University
- Ghent
- Belgium
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9
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Xu X, Su X, Bai B, Wang H, Suo Y. Synthesis of adipic acid dihydrazide-decorated coco peat powder-based superabsorbent for controlled release of soil nutrients. RSC Adv 2016. [DOI: 10.1039/c6ra22668j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We firstly employ adipic acid dihydrazide as an outstanding decoration substrate for the pretreatment of CP, and then synthesis a novel superabsorbent through grafting AA onto MA modified CP@ADH surface.
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Affiliation(s)
- Xiaohui Xu
- Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region
- Chang'an University
- Ministry of Education
- Xi'an
- P. R. China
| | - Xiaoyu Su
- Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region
- Chang'an University
- Ministry of Education
- Xi'an
- P. R. China
| | - Bo Bai
- State Key Laboratory of Plateau Ecology and Agriculture
- Qinghai University
- Xining
- P. R. China
| | - Honglun Wang
- State Key Laboratory of Plateau Ecology and Agriculture
- Qinghai University
- Xining
- P. R. China
| | - Yourui Suo
- State Key Laboratory of Plateau Ecology and Agriculture
- Qinghai University
- Xining
- P. R. China
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10
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Zhang M, Li D, He Y, Wang G. Preparation and photochromic properties of layer-by-layer self-assembly films and light-responsive micelles based on amphiphilic naphthopyran derivative. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 151:525-531. [PMID: 26162340 DOI: 10.1016/j.saa.2015.06.082] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 06/21/2015] [Accepted: 06/23/2015] [Indexed: 06/04/2023]
Abstract
An amphiphilic naphthopyran derivative (DSNP) with negative-charged di-sulfatoethoxy was first designed and synthesized. DSNP was used to prepare the LBL self-assembly films with cationic quaternized poly(4-vinylpyridine) (P4VPQ). The multilayer assembly process was monitored via UV-Vis spectra and the DSNP displayed a significant slow fading rate in film. In addition, DSNP was also used as the light-responsive group to fabricate light-responsive micelles with polyethylene glycol-triethylamine bromide (PEG-NEt3). The photoisomerization of naphthopyran moieties can rapidly and reversibly tune the disassembly and re-assembly of the micelles. The changes of fluorescent spectra of Nile Red (NR) in water solution of polymeric micelles demonstrated that the polymeric micelle can be used as nanocarriers to encapsulate, release and re-encapsulate guest solutes on demand controlling of light irradiation. The results indicate that the amphiphilic naphthopyran can be used in both optical-switches and biomedical area for drug delivery.
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Affiliation(s)
- Meiduo Zhang
- College of Chemistry, Jilin University, Changchun 130025, PR China; Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China
| | - Dehua Li
- Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China
| | - Yi He
- College of Chemistry, Jilin University, Changchun 130025, PR China.
| | - Guang Wang
- Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China.
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11
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Koniev O, Wagner A. Developments and recent advancements in the field of endogenous amino acid selective bond forming reactions for bioconjugation. Chem Soc Rev 2015; 44:5495-551. [PMID: 26000775 DOI: 10.1039/c5cs00048c] [Citation(s) in RCA: 391] [Impact Index Per Article: 43.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Bioconjugation methodologies have proven to play a central enabling role in the recent development of biotherapeutics and chemical biology approaches. Recent endeavours in these fields shed light on unprecedented chemical challenges to attain bioselectivity, biocompatibility, and biostability required by modern applications. In this review the current developments in various techniques of selective bond forming reactions of proteins and peptides were highlighted. The utility of each endogenous amino acid-selective conjugation methodology in the fields of biology and protein science has been surveyed with emphasis on the most relevant among reported transformations; selectivity and practical use have been discussed.
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Affiliation(s)
- Oleksandr Koniev
- Laboratory of Functional Chemo-Systems (UMR 7199), Labex Medalis, University of Strasbourg, 74 Route du Rhin, 67401 Illkirch-Graffenstaden, France.
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12
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Wang Y, Ling J. Synthetic protocols toward polypeptide conjugates via chain end functionalization after RAFT polymerization. RSC Adv 2015. [DOI: 10.1039/c4ra17094f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We design protocols of conjugating synthetic polypeptides to RAFT-prepared polymers regardless of RAFT CTA structures.
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Affiliation(s)
- Yifei Wang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou 310027
- China
| | - Jun Ling
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization
- Department of Polymer Science and Engineering
- Zhejiang University
- Hangzhou 310027
- China
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13
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Controlled release of highly water-soluble antidepressant from hybrid copolymer poly vinyl alcohol hydrogels. Polym Bull (Berl) 2013. [DOI: 10.1007/s00289-013-1043-8] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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Roth PJ, Theato P. Thiol–Thiosulfonate Chemistry in Polymer Science: Simple Functionalization of Polymers via Disulfide Linkages. THIOL‐X CHEMISTRIES IN POLYMER AND MATERIALS SCIENCE 2013. [DOI: 10.1039/9781849736961-00076] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Herein we highlight the reaction of thiols with thiosulfonates yielding asymmetric disulfides. The chapter begins with an overview of the synthesis and reactivity of functional thiosulfonates and is followed by a review of polymeric thiosulfonates. We then emphasize the novel use of thiosulfonates as trapping/functionalization agents for macromolecular thiols obtained from parent (co)polymers prepared by reversible addition‐fragmentation chain transfer (RAFT) radical polymerization. We also note how such facile disulfide‐forming chemistries can be readily employed simultaneously with other highly efficient coupling chemistries with an emphasis on the concurrent reaction of activated esters with amines in the presence of thiosulfonates. Finally, we discuss the use of methyl disulfide (SSMe) functional/end‐modified (co)polymers as reagents for the formation of polymeric self‐assembled monolayers (polymer brushes) on metal surfaces such as nanoparticles and quantum dots.
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Affiliation(s)
- Peter J. Roth
- Centre for Advanced Macromolecular Design (CAMD) School of Chemical Engineering, University of New South Wales, UNSW Sydney, NSW 2052 Australia
| | - Patrick Theato
- Institute for Technical and Macromolecular Chemistry University of Hamburg, Bundesstrasse 45, D‐20146 Hamburg Germany ‐hamburg.de
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Podkościelna B, Kołodyńska D. A new type of cation-exchange polymeric microspheres with pendant methylenethiol groups. POLYM ADVAN TECHNOL 2013. [DOI: 10.1002/pat.3155] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Beata Podkościelna
- Department of Polymer Chemistry, Faculty of Chemistry; Maria Curie-Sklodowska University; Maria Curie Skłodowska Sq. 5 20-031 Lublin Poland
| | - Dorota Kołodyńska
- Department of Inorganic Chemistry, Faculty of Chemistry; Maria Curie-Sklodowska University; Maria Curie Skłodowska Sq. 5 20-031 Lublin Poland
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16
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Stenzel MH. Bioconjugation Using Thiols: Old Chemistry Rediscovered to Connect Polymers with Nature's Building Blocks. ACS Macro Lett 2013; 2:14-18. [PMID: 35581832 DOI: 10.1021/mz3005814] [Citation(s) in RCA: 133] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Various pathways to bioconjugates based on thiol chemistry are discussed. Thiol-halogeno, thiol-parafluoro, thiol-ene, thiol-yne, thiol-vinylsulfone and thiol-vinyl sulfone, thiol-maleimide, thiol-bisulfone, and thiol-pyridyl disulfide are well-established synthetic routes discovered in recent years as tools to marry polymers with biomolecules such as carbohydrates, proteins, peptide, DNA, antibodies, or other building blocks from nature.
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Affiliation(s)
- Martina H. Stenzel
- Centre for Advanced
Macromolecular Design (CAMD), School
of Chemical Engineering, University of New South Wales, Sydney NSW 2052, Australia
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