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Electrochemical Investigation of Iron-Catalyzed Atom Transfer Radical Polymerization. Molecules 2022; 27:molecules27196312. [PMID: 36234849 PMCID: PMC9570559 DOI: 10.3390/molecules27196312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Revised: 09/16/2022] [Accepted: 09/20/2022] [Indexed: 11/17/2022] Open
Abstract
Use of iron-based catalysts in atom transfer radical polymerization (ATRP) is very interesting because of the abundance of the metal and its biocompatibility. Although the mechanism of action is not well understood yet, iron halide salts are usually used as catalysts, often in the presence of nitrogen or phosphorous ligands (L). In this study, electrochemically mediated ATRP (eATRP) of methyl methacrylate (MMA) catalyzed by FeCl3, both in the absence and presence of additional ligands, was investigated in dimethylformamide. The electrochemical behavior of FeCl3 and FeCl3/L was deeply investigated showing the speciation of Fe(III) and Fe(II) and the role played by added ligands. It is shown that amine ligands form stable iron complexes, whereas phosphines act as reducing agents. eATRP of MMA catalyzed by FeCl3 was investigated in different conditions. In particular, the effects of temperature, catalyst concentration, catalyst-to-initiator ratio, halide ion excess and added ligands were investigated. In general, polymerization was moderately fast but difficult to control. Surprisingly, the best results were obtained with FeCl3 without any other ligand. Electrogenerated Fe(II) effectively activates the dormant chains but deactivation of the propagating radicals by Fe(III) species is less efficient, resulting in dispersity > 1.5, unless a high concentration of FeCl3 is used.
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Li R, Kong W, An Z. Enzyme Catalysis for Reversible Deactivation Radical Polymerization. Angew Chem Int Ed Engl 2022; 61:e202202033. [PMID: 35212121 DOI: 10.1002/anie.202202033] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Indexed: 12/31/2022]
Abstract
Enzyme catalysis has been increasingly utilized in reversible deactivation radical polymerization (Enz-RDRP) on account of its mildness, efficiency, and sustainability. In this Minireview we discuss the key roles enzymes play in RDRP, including their ATRPase, initiase, deoxygenation, and photoenzyme activities. We use selected examples to highlight applications of Enz-RDRP in surface brush fabrication, sensing, polymerization-induced self-assembly, and high-throughput synthesis. We also give our reflections on the challenges and future directions of this emerging area.
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Affiliation(s)
- Ruoyu Li
- State Key Laboratory of Supramolecular Structure and Materials College of Chemistry, Jilin University, Changchun, 130012, China
| | - Weina Kong
- State Key Laboratory of Supramolecular Structure and Materials College of Chemistry, Jilin University, Changchun, 130012, China
| | - Zesheng An
- State Key Laboratory of Supramolecular Structure and Materials College of Chemistry, Jilin University, Changchun, 130012, China.,Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University, Changchun, 130012, China
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An Z, Li R, Kong W. Enzyme Catalysis for Reversible Deactivation Radical Polymerization. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202202033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Zesheng An
- Jilin University State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry 2699 Qianjin Street, Changchun 130012, China 130012 Changchun CHINA
| | - Ruoyu Li
- Jilin University College of Chemistry CHINA
| | - Weina Kong
- Jilin University College of Chemistry CHINA
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Baptista V, Peng WK, Minas G, Veiga MI, Catarino SO. Review of Microdevices for Hemozoin-Based Malaria Detection. BIOSENSORS 2022; 12:bios12020110. [PMID: 35200370 PMCID: PMC8870200 DOI: 10.3390/bios12020110] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 02/04/2022] [Accepted: 02/06/2022] [Indexed: 05/21/2023]
Abstract
Despite being preventable and treatable, malaria still puts almost half of the world's population at risk. Thus, prompt, accurate and sensitive malaria diagnosis is crucial for disease control and elimination. Optical microscopy and immuno-rapid tests are the standard malaria diagnostic methods in the field. However, these are time-consuming and fail to detect low-level parasitemia. Biosensors and lab-on-a-chip devices, as reported to different applications, usually offer high sensitivity, specificity, and ease of use at the point of care. Thus, these can be explored as an alternative for malaria diagnosis. Alongside malaria infection inside the human red blood cells, parasites consume host hemoglobin generating the hemozoin crystal as a by-product. Hemozoin is produced in all parasite species either in symptomatic and asymptomatic individuals. Furthermore, hemozoin crystals are produced as the parasites invade the red blood cells and their content relates to disease progression. Hemozoin is, therefore, a unique indicator of infection, being used as a malaria biomarker. Herein, the so-far developed biosensors and lab-on-a-chip devices aiming for malaria detection by targeting hemozoin as a biomarker are reviewed and discussed to fulfil all the medical demands for malaria management towards elimination.
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Affiliation(s)
- Vitória Baptista
- Microelectromechanical Systems Research Unit (CMEMS-UMinho), School of Engineering, Campus de Azurém, University of Minho, 4800-058 Guimarães, Portugal; (G.M.); (S.O.C.)
- LABBELS-Associate Laboratory, Braga/Guimarães, 4806-909 Guimarães, Portugal
- Life and Health Sciences Research Institute (ICVS), School of Medicine, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal;
- ICVS/3B’s-PT Government Associate Laboratory, Braga/Guimarães, 4806-909 Guimarães, Portugal
- Correspondence:
| | - Weng Kung Peng
- Songshan Lake Materials Laboratory, Building A1, University Innovation Park, Dongguan 523808, China;
| | - Graça Minas
- Microelectromechanical Systems Research Unit (CMEMS-UMinho), School of Engineering, Campus de Azurém, University of Minho, 4800-058 Guimarães, Portugal; (G.M.); (S.O.C.)
- LABBELS-Associate Laboratory, Braga/Guimarães, 4806-909 Guimarães, Portugal
| | - Maria Isabel Veiga
- Life and Health Sciences Research Institute (ICVS), School of Medicine, Campus de Gualtar, University of Minho, 4710-057 Braga, Portugal;
- ICVS/3B’s-PT Government Associate Laboratory, Braga/Guimarães, 4806-909 Guimarães, Portugal
| | - Susana O. Catarino
- Microelectromechanical Systems Research Unit (CMEMS-UMinho), School of Engineering, Campus de Azurém, University of Minho, 4800-058 Guimarães, Portugal; (G.M.); (S.O.C.)
- LABBELS-Associate Laboratory, Braga/Guimarães, 4806-909 Guimarães, Portugal
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