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Dean AC, Randle EH, Lacey AJD, Marczak Giorio GA, Doobary S, Cons BD, Lennox AJJ. Alkene 1,3-Difluorination via Transient Oxonium Intermediates. Angew Chem Int Ed Engl 2024; 63:e202404666. [PMID: 38695434 DOI: 10.1002/anie.202404666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Indexed: 06/21/2024]
Abstract
The 1,3-difunctionalization of unactivated alkenes is an under-explored transformation that leads to moieties that are otherwise challenging to prepare. Herein, we report a hypervalent iodine-mediated 1,3-difluorination of homoallylic (aryl) ethers to give unreported 1,3-difluoro-4-oxy groups with moderate to excellent diastereoselectivity. The transformation proceeds through a different mode of reactivity for 1,3-difunctionalization, in which a regioselective addition of fluoride opens a transiently formed oxonium intermediate to rearrange an alkyl chain. The optimized protocol is scalable and shown to proceed well with a variety of functional groups and substitution on the alkenyl chain, hence providing ready access to this fluorinated, conformationally controlled moiety.
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Affiliation(s)
- Alice C Dean
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, U.K
| | - E Harvey Randle
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, U.K
| | - Andrew J D Lacey
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, U.K
| | | | - Sayad Doobary
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, U.K
| | - Benjamin D Cons
- Astex Pharmaceuticals, 436 Cambridge Science Park, Cambridge, CB4 0QA, U.K
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Kosovari M, Buffeteau T, Thomas L, Guay Bégin AA, Vellutini L, McGettrick JD, Laroche G, Durrieu MC. Silanization Strategies for Tailoring Peptide Functionalization on Silicon Surfaces: Implications for Enhancing Stem Cell Adhesion. ACS APPLIED MATERIALS & INTERFACES 2024; 16:29770-29782. [PMID: 38832565 DOI: 10.1021/acsami.4c03727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2024]
Abstract
Biomaterial surface engineering and the integration of cell-adhesive ligands are crucial in biological research and biotechnological applications. The interplay between cells and their microenvironment, influenced by chemical and physical cues, impacts cellular behavior. Surface modification of biomaterials profoundly affects cellular responses, especially at the cell-surface interface. This work focuses on enhancing cellular activities through material manipulation, emphasizing silanization for further functionalization with bioactive molecules such as RGD peptides to improve cell adhesion. The grafting of three distinct silanes onto silicon wafers using both spin coating and immersion methods was investigated. This study sheds light on the effects of different alkyl chain lengths and protecting groups on cellular behavior, providing valuable insights into optimizing silane-based self-assembled monolayers (SAMs) before peptide or protein grafting for the first time. Specifically, it challenges the common use of APTES molecules in this context. These findings advance our understanding of surface modification strategies, paving the way for tailoring biomaterial surfaces to modulate the cellular behavior for diverse biotechnological applications.
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Affiliation(s)
- Melissa Kosovari
- Univ. Bordeaux, CNRS, Bordeaux INP, CBMN, UMR 5248, Pessac F-33600, France
- Laboratoire d'Ingénierie de Surface, Centre de Recherche sur les Matériaux Avancés, Département de Génie des Mines, de la Métallurgie et des Matériaux, Université Laval, 1065 Avenue de la médecine, Québec G1 V 0A6, Canada
- Axe médecine régénératrice, Centre de Recherche du Centre Hospitalier Universitaire de Québec, Hôpital St-François d'Assise, 10 rue de l'Espinay, Québec G1L 3L5, Canada
| | - Thierry Buffeteau
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, Talence F-33400, France
| | - Laurent Thomas
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, Talence F-33400, France
| | - Andrée-Anne Guay Bégin
- Laboratoire d'Ingénierie de Surface, Centre de Recherche sur les Matériaux Avancés, Département de Génie des Mines, de la Métallurgie et des Matériaux, Université Laval, 1065 Avenue de la médecine, Québec G1 V 0A6, Canada
- Axe médecine régénératrice, Centre de Recherche du Centre Hospitalier Universitaire de Québec, Hôpital St-François d'Assise, 10 rue de l'Espinay, Québec G1L 3L5, Canada
| | - Luc Vellutini
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, Talence F-33400, France
| | - James D McGettrick
- College of Engineering, Swansea University, Bay Campus, Swansea SA1 8EN, U.K
| | - Gaétan Laroche
- Laboratoire d'Ingénierie de Surface, Centre de Recherche sur les Matériaux Avancés, Département de Génie des Mines, de la Métallurgie et des Matériaux, Université Laval, 1065 Avenue de la médecine, Québec G1 V 0A6, Canada
- Axe médecine régénératrice, Centre de Recherche du Centre Hospitalier Universitaire de Québec, Hôpital St-François d'Assise, 10 rue de l'Espinay, Québec G1L 3L5, Canada
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Baghapour S, Nehema J, Zhang WQ, Warren-Smith SC, Hickey SM, Plush SE, Afshar Vahid S. Surface Functionalised Optical Fibre for Detection of Hydrogen Sulphide. BIOSENSORS 2023; 13:949. [PMID: 37998124 PMCID: PMC10669384 DOI: 10.3390/bios13110949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 10/19/2023] [Accepted: 10/20/2023] [Indexed: 11/25/2023]
Abstract
Dysregulated production of hydrogen sulphide in the human body has been associated with various diseases including cancer, underlining the importance of accurate detection of this molecule. Here, we report the detection of hydrogen sulphide using fluorescence-emission enhancement of two 1,8-naphthalimide fluorescent probes with an azide moiety in position 4. One probe, serving as a control, featured a methoxyethyl moiety through the imide to evaluate its effectiveness for hydrogen sulphide detection, while the other probe was modified with (3-aminopropyl)triethoxysilane (APTES) to enable direct covalent attachment to an optical fibre tip. We coated the optical fibre tip relatively homogeneously with the APTES-azide fluorophore, as confirmed via x-ray photoelectron spectroscopy (XPS). The absorption and fluorescence responses of the control fluorophore free in PBS were analysed using UV-Vis and fluorescence spectrophotometry, while the fluorescence emission of the APTES-azide fluorophore-coated optical fibres was examined using a simple, low-cost optical fibre-based setup. Both fluorescent probes exhibited a significant increase (more than double the initial value) in fluorescence emission upon the addition of HS- when excited with 405 nm. However, the fluorescence enhancement of the coated optical fibres demonstrated a much faster response time of 2 min (time for the fluorescence intensity to reach 90% of its maximum value) compared to the control fluorophore in solution (30 min). Additionally, the temporal evolution of fluorescence intensity of the fluorophore coated on the optical fibre was studied at two pH values (7.4 and 6.4), demonstrating a reasonable overlap and confirming the compound pH insensitivity within this range. The promising results from this study indicate the potential for developing an optical fibre-based sensing system for HS- detection using the synthesised fluorophore, which could have significant applications in health monitoring and disease detection.
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Affiliation(s)
- Shaghayegh Baghapour
- Laser Physics and Photonic Devices Laboratory, UniSA STEM, University of South Australia, Adelaide, SA 5095, Australia
| | - Jasmine Nehema
- Clinical and Health Sciences, University of South Australia, Adelaide, SA 5000, Australia
| | - Wen Qi Zhang
- Laser Physics and Photonic Devices Laboratory, UniSA STEM, University of South Australia, Adelaide, SA 5095, Australia
- Future Industries Institute, University of South Australia, Adelaide, SA 5095, Australia
| | - Stephen C Warren-Smith
- Laser Physics and Photonic Devices Laboratory, UniSA STEM, University of South Australia, Adelaide, SA 5095, Australia
- Future Industries Institute, University of South Australia, Adelaide, SA 5095, Australia
| | - Shane M Hickey
- Clinical and Health Sciences, University of South Australia, Adelaide, SA 5000, Australia
| | - Sally E Plush
- Clinical and Health Sciences, University of South Australia, Adelaide, SA 5000, Australia
| | - Shahraam Afshar Vahid
- Laser Physics and Photonic Devices Laboratory, UniSA STEM, University of South Australia, Adelaide, SA 5095, Australia
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Rouvière L, Al-Hajj N, Hunel J, Aupetit C, Buffeteau T, Vellutini L, Genin E. Silane-Based SAMs Deposited by Spin Coating as a Versatile Alternative Process to Solution Immersion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:6464-6471. [PMID: 35544953 DOI: 10.1021/acs.langmuir.2c00668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Functionalization of silica surfaces with silane-based self-assembled monolayers (SAMs) is widely used in material sciences to tune surface properties and introduce terminal functional groups enabling subsequent chemical surface reactions and immobilization of (bio)molecules. Here, we report on the synthesis of four organotrimethoxysilanes with various molecular structures and we compare their grafting by spin coating with the one performed by the conventional solution immersion method. Strikingly, this study clearly demonstrates that the spin coating technique is a versatile, fast, and more convenient alternative process to prepare robust, smooth, and homogeneous SAMs with similar properties and quality as those deposited via immersion. SAMs were characterized by PM-IRRAS, AFM, and wettability measurements. SAMs can undergo several chemical surface modifications, and the reactivity of amine-terminated SAM was confirmed by PM-IRRAS and fluorescence measurements.
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Affiliation(s)
- Lisa Rouvière
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Nisreen Al-Hajj
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
- Department of Chemistry, Faculty of Science, An-Najah National University, P.O. Box 7, 400 Nablus, Palestine
| | - Julien Hunel
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Christian Aupetit
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Thierry Buffeteau
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Luc Vellutini
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Emilie Genin
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
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