1
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Krumins E, Crawford LA, Rogers DM, Machado F, Taresco V, East M, Irving SH, Fowler HR, Jiang L, Starr N, Parmenter CDJ, Kortsen K, Cuzzucoli Crucitti V, Avery SV, Tuck CJ, Howdle SM. A facile one step route that introduces functionality to polymer powders for laser sintering. Nat Commun 2024; 15:3137. [PMID: 38605004 PMCID: PMC11009337 DOI: 10.1038/s41467-024-47376-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 03/28/2024] [Indexed: 04/13/2024] Open
Abstract
Laser Sintering (LS) is a type of Additive Manufacturing (AM) exploiting laser processing of polymeric particles to produce 3D objects. Because of its ease of processability and thermo-physical properties, polyamide-12 (PA-12) represents ~95% of the polymeric materials used in LS. This constrains the functionality of the items produced, including limited available colours. Moreover, PA-12 objects tend to biofoul in wet environments. Therefore, a key challenge is to develop an inexpensive route to introduce desirable functionality to PA-12. We report a facile, clean, and scalable approach to modification of PA-12, exploiting supercritical carbon dioxide (scCO2) and free radical polymerizations to yield functionalised PA-12 materials. These can be easily printed using commercial apparatus. We demonstrate the potential by creating coloured PA-12 materials and show that the same approach can be utilized to create anti-biofouling objects. Our approach to functionalise materials could open significant new applications for AM.
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Affiliation(s)
- Eduards Krumins
- School of Chemistry, University of Nottingham, University Park Nottingham, NG7 2RD, Nottingham, UK
| | - Liam A Crawford
- Life Sciences, Faculty of Medicine and Health Sciences, University of Nottingham, University Park Nottingham, NG7 2RD, Nottingham, UK
| | - David M Rogers
- School of Chemistry, University of Nottingham, University Park Nottingham, NG7 2RD, Nottingham, UK
| | - Fabricio Machado
- School of Chemistry, University of Nottingham, University Park Nottingham, NG7 2RD, Nottingham, UK
- Institute of Chemistry, University of Brasília, Campus Universitário Darcy Ribeiro, Brasília, DF, 70910-900, Brazil
| | - Vincenzo Taresco
- School of Chemistry, University of Nottingham, University Park Nottingham, NG7 2RD, Nottingham, UK
| | - Mark East
- Centre of Additive Manufacturing, Faculty of Engineering, University of Nottingham, 522 Derby Rd, Lenton, Nottingham, NG7 2GX, UK
| | - Samuel H Irving
- School of Chemistry, University of Nottingham, University Park Nottingham, NG7 2RD, Nottingham, UK
| | - Harriet R Fowler
- School of Chemistry, University of Nottingham, University Park Nottingham, NG7 2RD, Nottingham, UK
| | - Long Jiang
- School of Pharmacy, University of Nottingham, University Park Nottingham, Nottingham, NG7 2RD, UK
| | - Nichola Starr
- School of Pharmacy, University of Nottingham, University Park Nottingham, Nottingham, NG7 2RD, UK
| | - Christopher D J Parmenter
- Nottingham Nanoscale and Microscale Research Centre, University Park, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Kristoffer Kortsen
- School of Chemistry, University of Nottingham, University Park Nottingham, NG7 2RD, Nottingham, UK
| | - Valentina Cuzzucoli Crucitti
- Centre of Additive Manufacturing, Faculty of Engineering, University of Nottingham, 522 Derby Rd, Lenton, Nottingham, NG7 2GX, UK
| | - Simon V Avery
- Life Sciences, Faculty of Medicine and Health Sciences, University of Nottingham, University Park Nottingham, NG7 2RD, Nottingham, UK
| | - Christopher J Tuck
- Centre of Additive Manufacturing, Faculty of Engineering, University of Nottingham, 522 Derby Rd, Lenton, Nottingham, NG7 2GX, UK
| | - Steven M Howdle
- School of Chemistry, University of Nottingham, University Park Nottingham, NG7 2RD, Nottingham, UK.
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2
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Krumins E, Lentz JC, Sutcliffe B, Sohaib A, Jacob PL, Brugnoli B, Cuzzucoli Crucitti V, Cavanagh R, Owen R, Moloney C, Ruiz-Cantu L, Francolini I, Howdle SM, Shusteff M, Rose FRAJ, Wildman RD, He Y, Taresco V. Glycerol-based sustainably sourced resin for volumetric printing. Green Chem 2024; 26:1345-1355. [PMID: 38323306 PMCID: PMC10840650 DOI: 10.1039/d3gc03607c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Accepted: 01/02/2024] [Indexed: 02/08/2024]
Abstract
Volumetric Additive Manufacturing (VAM) represents a revolutionary advancement in the field of Additive Manufacturing, as it allows for the creation of objects in a single, cohesive process, rather than in a layer-by-layer approach. This innovative technique offers unparalleled design freedom and significantly reduces printing times. A current limitation of VAM is the availability of suitable resins with the required photoreactive chemistry and from sustainable sources. To support the application of this technology, we have developed a sustainable resin based on polyglycerol, a bioderived (e.g., vegetable origin), colourless, and easily functionisable oligomer produced from glycerol. To transform polyglycerol-6 into an acrylate photo-printable resin we adopted a simple, one-step, and scalable synthesis route. Polyglycerol-6-acrylate fulfils all the necessary criteria for volumetric printing (transparency, photo-reactivity, viscosity) and was successfully used to print a variety of models with intricate geometries and good resolution. The waste resin was found to be reusable with minimal performance issues, improving resin utilisation and minimising waste material. Furthermore, by incorporating dopants such as poly(glycerol) adipate acrylate (PGA-A) and 10,12-pentacosadyinoic acid (PCDA), we demonstrated the ability to print objects with a diverse range of functionalities, including temperature sensing probes and a polyester excipient, highlighting the potential applications of these new resins.
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Affiliation(s)
- Eduards Krumins
- School of Chemistry, University of Nottingham Nottingham NG7 2RD UK
| | - Joachim C Lentz
- School of Chemistry, University of Nottingham Nottingham NG7 2RD UK
| | - Ben Sutcliffe
- School of Pharmacy, Nottingham Biodiscovery Institute, University of Nottingham NG7 2RD Nottingham UK
| | - Ali Sohaib
- Faculty of Engineering, University of Nottingham Nottingham NG7 2RD UK
| | - Philippa L Jacob
- School of Chemistry, University of Nottingham Nottingham NG7 2RD UK
| | - Benedetta Brugnoli
- Department of Chemistry, Sapienza University of Rome Piazzale A. Moro 5 00185 Rome Italy
| | | | - Robert Cavanagh
- School of Pharmacy, Nottingham Biodiscovery Institute, University of Nottingham NG7 2RD Nottingham UK
- School of Medicine, University of Nottingham Biodiscovery Institute, University of Nottingham NG7 2RD UK
| | - Robert Owen
- School of Pharmacy, Nottingham Biodiscovery Institute, University of Nottingham NG7 2RD Nottingham UK
| | - Cara Moloney
- School of Medicine, University of Nottingham Biodiscovery Institute, University of Nottingham NG7 2RD UK
| | - Laura Ruiz-Cantu
- Faculty of Engineering, University of Nottingham Nottingham NG7 2RD UK
| | - Iolanda Francolini
- Department of Chemistry, Sapienza University of Rome Piazzale A. Moro 5 00185 Rome Italy
| | - Steven M Howdle
- School of Chemistry, University of Nottingham Nottingham NG7 2RD UK
| | - Maxim Shusteff
- Lawrence Livermore National Laboratory Livermore CA 94550 USA
| | - Felicity R A J Rose
- School of Pharmacy, Nottingham Biodiscovery Institute, University of Nottingham NG7 2RD Nottingham UK
| | - Ricky D Wildman
- Faculty of Engineering, University of Nottingham Nottingham NG7 2RD UK
| | - Yinfeng He
- Faculty of Engineering, University of Nottingham Nottingham NG7 2RD UK
- Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute University of Nottingham Ningbo China Ningbo 315100 China
| | - Vincenzo Taresco
- School of Chemistry, University of Nottingham Nottingham NG7 2RD UK
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3
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Jacob PL, Brugnoli B, Del Giudice A, Phan H, Chauhan VM, Beckett L, Gillis RB, Moloney C, Cavanagh RJ, Krumins E, Reynolds-Green M, Lentz JC, Conte C, Cuzzucoli Crucitti V, Couturaud B, Galantini L, Francolini I, Howdle SM, Taresco V. Poly (diglycerol adipate) variants as enhanced nanocarrier replacements in drug delivery applications. J Colloid Interface Sci 2023; 641:1043-1057. [PMID: 36996683 DOI: 10.1016/j.jcis.2023.03.124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 02/17/2023] [Accepted: 03/19/2023] [Indexed: 03/30/2023]
Abstract
Sustainably derived poly(glycerol adipate) (PGA) has been deemed to deliver all the desirable features expected in a polymeric scaffold for drug-delivery, including biodegradability, biocompatibility, self-assembly into nanoparticles (NPs) and a functionalisable pendant group. Despite showing these advantages over commercial alkyl polyesters, PGA suffers from a series of key drawbacks caused by poor amphiphilic balance. This leads to weak drug-polymer interactions and subsequent low drug-loading in NPs, as well as low NPs stability. To overcome this, in the present work, we applied a more significant variation of the polyester backbone while maintaining mild and sustainable polymerisation conditions. We have investigated the effect of the variation of both hydrophilic and hydrophobic segments upon physical properties and drug interactions as well as self-assembly and NPs stability. For the first time we have replaced glycerol with the more hydrophilic diglycerol, as well as adjusting the final amphiphilic balance of the polyester repetitive units by incorporating the more hydrophobic 1,6-n-hexanediol (Hex). The properties of the novel poly(diglycerol adipate) (PDGA) variants have been compared against known polyglycerol-based polyesters. Interestingly, while the bare PDGA showed improved water solubility and diminished self-assembling ability, the Hex variation demonstrated enhanced features as a nanocarrier. In this regard, PDGAHex NPs were tested for their stability in different environments and for their ability to encode enhanced drug loading. Moreover, the novel materials have shown good biocompatibility in both in vitro and in vivo (whole organism) experiments.
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Affiliation(s)
- Philippa L Jacob
- School of Chemistry, University Park, Nottingham NG7 2RD, United Kingdom
| | - Benedetta Brugnoli
- Dept. of Chemistry, Sapienza University of Rome, Piazzale A. Moro 5, 00185 Rome, Italy
| | | | - Hien Phan
- Institut de Chimie et des Matériaux Paris-Est, Université de Paris-Est Créteil, CNRS UMR 7182, 2 rue Henri Dunant, 94320 Thiais, France
| | - Veeren M Chauhan
- Laboratory of Biophysics and Surface Analysis, School of Pharmacy, University of Nottingham, Boots Sciences Building, University Park, Nottingham NG7 2RD, United Kingdom
| | - Laura Beckett
- Laboratory of Biophysics and Surface Analysis, School of Pharmacy, University of Nottingham, Boots Sciences Building, University Park, Nottingham NG7 2RD, United Kingdom
| | - Richard B Gillis
- National Centre for Macromolecular Hydrodynamics, University of Nottingham, Sutton Bonington LE12 5RD, United Kingdom; Biomaterials Group, School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, United Kingdom; College of Business, Technology and Engineering, Sheffield Hallam University, Food and Nutrition Group, Sheffield S1 1WB, United Kingdom
| | - Cara Moloney
- School of Medicine, BioDiscovery Institute-3, University Park, Nottingham NG7 2RD, United Kingdom
| | - Robert J Cavanagh
- School of Medicine, BioDiscovery Institute-3, University Park, Nottingham NG7 2RD, United Kingdom
| | - Eduards Krumins
- School of Chemistry, University Park, Nottingham NG7 2RD, United Kingdom
| | | | - Joachim C Lentz
- School of Chemistry, University Park, Nottingham NG7 2RD, United Kingdom
| | - Claudia Conte
- Department of Pharmacy, University of Napoli Federico II, Napoli, Italy
| | - Valentina Cuzzucoli Crucitti
- Centre for Additive Manufacturing and Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, United Kingdom
| | - Benoit Couturaud
- Institut de Chimie et des Matériaux Paris-Est, Université de Paris-Est Créteil, CNRS UMR 7182, 2 rue Henri Dunant, 94320 Thiais, France
| | - Luciano Galantini
- Dept. of Chemistry, Sapienza University of Rome, Piazzale A. Moro 5, 00185 Rome, Italy
| | - Iolanda Francolini
- Dept. of Chemistry, Sapienza University of Rome, Piazzale A. Moro 5, 00185 Rome, Italy
| | - Steven M Howdle
- School of Chemistry, University Park, Nottingham NG7 2RD, United Kingdom
| | - Vincenzo Taresco
- School of Chemistry, University Park, Nottingham NG7 2RD, United Kingdom.
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4
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Lentz JC, Cavanagh R, Moloney C, Falcone Pin B, Kortsen K, Fowler HR, Jacob PL, Krumins E, Clark C, Machado F, Breitkreuz N, Cale B, Goddard AR, Hirst JD, Taresco V, Howdle SM. N-Hydroxyethyl acrylamide as a functional eROP initiator for the preparation of nanoparticles under "greener" reaction conditions. Polym Chem 2022; 13:6032-6045. [PMID: 36353599 PMCID: PMC9623607 DOI: 10.1039/d2py00849a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Accepted: 10/09/2022] [Indexed: 06/16/2023]
Abstract
N-Hydroxyethyl acrylamide was used as a functional initiator for the enzymatic ring-opening polymerisation of ε-caprolactone and δ-valerolactone. N-Hydroxyethyl acrylamide was found not to undergo self-reaction in the presence of Lipase B from Candida antarctica under the reaction conditions employed. By contrast, this is a major problem for 2-hydroxyethyl methacrylate and 2-hydroxyethyl acrylate which both show significant transesterification issues leading to unwanted branching and cross-linking. Surprisingly, N-hydroxyethyl acrylamide did not react fully during enzymatic ring-opening polymerisation. Computational docking studies helped us understand that the initiated polymer chains have a higher affinity for the enzyme active site than the initiator alone, leading to polymer propagation proceeding at a faster rate than polymer initiation leading to incomplete initiator consumption. Hydroxyl end group fidelity was confirmed by organocatalytic chain extension with lactide. N-Hydroxyethyl acrylamide initiated polycaprolactones were free-radical copolymerised with PEGMA to produce a small set of amphiphilic copolymers. The amphiphilic polymers were shown to self-assemble into nanoparticles, and to display low cytotoxicity in 2D in vitro experiments. To increase the green credentials of the synthetic strategies, all reactions were carried out in 2-methyl tetrahydrofuran, a solvent derived from renewable resources and an alternative for the more traditionally used fossil-based solvents tetrahydrofuran, dichloromethane, and toluene.
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Affiliation(s)
- Joachim C Lentz
- School of Chemistry, University of Nottingham, University Park NG7 2RD Nottingham UK
| | - Robert Cavanagh
- School of Pharmacy, University of Nottingham, University Park NG7 2RD Nottingham UK
| | - Cara Moloney
- School of Pharmacy, University of Nottingham, University Park NG7 2RD Nottingham UK
| | - Bruno Falcone Pin
- School of Chemistry, University of Nottingham, University Park NG7 2RD Nottingham UK
| | - Kristoffer Kortsen
- School of Chemistry, University of Nottingham, University Park NG7 2RD Nottingham UK
| | - Harriet R Fowler
- School of Chemistry, University of Nottingham, University Park NG7 2RD Nottingham UK
| | - Philippa L Jacob
- School of Chemistry, University of Nottingham, University Park NG7 2RD Nottingham UK
| | - Eduards Krumins
- School of Chemistry, University of Nottingham, University Park NG7 2RD Nottingham UK
| | - Charlotte Clark
- School of Chemistry, University of Nottingham, University Park NG7 2RD Nottingham UK
| | - Fabricio Machado
- School of Chemistry, University of Nottingham, University Park NG7 2RD Nottingham UK
- Institute of Chemistry, University of Brasília Campus Universitário Darcy Ribeiro 70910-900 Brasília DF Brazil
| | - Nicholas Breitkreuz
- School of Chemistry, University of Nottingham, University Park NG7 2RD Nottingham UK
| | - Ben Cale
- Croda Europe Limited Cowick Hall Snaith DN14 9AA Goole UK
| | - Amy R Goddard
- Croda Europe Limited Cowick Hall Snaith DN14 9AA Goole UK
| | - Jonathan D Hirst
- School of Chemistry, University of Nottingham, University Park NG7 2RD Nottingham UK
| | - Vincenzo Taresco
- School of Chemistry, University of Nottingham, University Park NG7 2RD Nottingham UK
| | - Steven M Howdle
- School of Chemistry, University of Nottingham, University Park NG7 2RD Nottingham UK
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5
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Kortsen K, Fowler HR, Jacob PL, Krumins E, Lentz JC, Souhil MR, Taresco V, Howdle SM. Exploiting the tuneable density of scCO2 to improve particle size control for dispersion polymerisations in the presence of poly(dimethyl siloxane) stabilisers. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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6
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Monaghan OR, Skowron ST, Moore JC, Pin-Nó M, Kortsen K, Atkinson RL, Krumins E, Lentz JC, Machado F, Onat Z, Brookfield A, Collison D, Khlobystov AN, De Focatiis D, Irvine DJ, Taresco V, Stockman RA, Howdle SM. A self-crosslinking monomer, α-pinene methacrylate: understanding and exploiting hydrogen abstraction. Polym Chem 2022. [DOI: 10.1039/d2py00878e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A combined computational/experimental approach has been applied to investigate the self-crosslinking of α-pinene methacrylate via chain transfer through hydrogen abstraction.
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Affiliation(s)
- Olivia R. Monaghan
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Stephen T. Skowron
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Jonathan C. Moore
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - María Pin-Nó
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Kristoffer Kortsen
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Rachel L. Atkinson
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Eduards Krumins
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Joachim C. Lentz
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Fabricio Machado
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
- Institute of Chemistry, University of Brasília, Campus Universitário Darcy Ribeiro, 70910-900, Brasília, DF, Brazil
| | - Zeynep Onat
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Adam Brookfield
- Department of Chemistry, The University of Manchester, Manchester M13 9PL, UK
| | - David Collison
- Department of Chemistry, The University of Manchester, Manchester M13 9PL, UK
| | - Andrei N. Khlobystov
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Davide De Focatiis
- Faculty of Engineering, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Derek J. Irvine
- Faculty of Engineering, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Vincenzo Taresco
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Robert A. Stockman
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
| | - Steven M. Howdle
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, Nottingham, UK
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7
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Larder RR, Krumins E, Jacob PL, Kortsen K, Cavanagh R, Jiang L, Vuotto C, Francolini I, Tuck C, Taresco V, Howdle SM. Antimicrobial ‘inks’ for 3D printing: block copolymer-silver nanoparticle composites synthesised using supercritical CO 2. Polym Chem 2022. [DOI: 10.1039/d2py00398h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new synthetic methodology to produce polymer-AgNP composite microparticles using scCO2 is presented. These microparticle possessed long-lived antimicrobial activity and were tested for compatibility in the Laser Sintering 3D printing process.
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Affiliation(s)
- Ryan R. Larder
- School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Eduards Krumins
- School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
- Centre for Additive Manufacturing, Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Philippa L. Jacob
- School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Kristoffer Kortsen
- School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Robert Cavanagh
- School of Pharmacy, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Long Jiang
- School of Pharmacy, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Claudia Vuotto
- Microbial Biofilm Laboratory, IRCCS Fondazione Santa Lucia, 00143 Rome, Italy
| | | | - Christopher Tuck
- Centre for Additive Manufacturing, Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Vincenzo Taresco
- School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Steven M. Howdle
- School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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8
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Englezou G, Kortsen K, Pacheco AAC, Cavanagh R, Lentz JC, Krumins E, Sanders‐Velez C, Howdle SM, Nedoma AJ, Taresco V. 2‐Methyltetrahydrofuran (
2‐MeTHF
) as a versatile green solvent for the synthesis of amphiphilic copolymers via
ROP
,
FRP
, and
RAFT
tandem polymerizations. Journal of Polymer Science 2020. [DOI: 10.1002/pol.20200183] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Georgia Englezou
- Department of Chemical and Biological Engineering The University of Sheffield Sheffield UK
| | | | | | | | | | | | | | | | - Alisyn J. Nedoma
- Department of Chemical and Biological Engineering The University of Sheffield Sheffield UK
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9
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O'Brien DM, Atkinson RL, Cavanagh R, Pacheco AA, Larder R, Kortsen K, Krumins E, Haddleton AJ, Alexander C, Stockman RA, Howdle SM, Taresco V. A ‘greener’ one-pot synthesis of monoterpene-functionalised lactide oligomers. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2020.109516] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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10
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Sutherland GR, Baker E, Purvis-Smith S, Hockey A, Krumins E, Eichenbaum SZ. Prenatal diagnosis of the fragile X using thymidine induction. Prenat Diagn 1987; 7:197-202. [PMID: 2954037 DOI: 10.1002/pd.1970070307] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Eleven pregnancies in ten patients at risk for the fragile X were monitored by amniocentesis or chorion villus biopsy and induction of the fragile site using thymidine, methotrexate and FUdR. Three female fetuses and one male fetus were found to have the fragile X. The results obtained using thymidine induction were superior to those using methotrexate induction and probably better than those obtained using FUdR induction.
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