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Dobroiu S, van Delft FCMJM, Sudalaiyadum Perumal A, Dash S, Aveyard J, van Zijl J, Snijder J, van den Heuvel E, van Berkum J, Blanchard MP, Favard C, Nicolau DV. Spatially Addressable Multiplex Biodetection by Calibrated Micro/Nanostructured Surfaces. ACS Sens 2023; 8:1882-1890. [PMID: 37099014 DOI: 10.1021/acssensors.2c01939] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Abstract
A challenge of any biosensing technology is the detection of very low concentrations of analytes. The fluorescence interference contrast (FLIC) technique improves the fluorescence-based sensitivity by selectively amplifying, or suppressing, the emission of a fluorophore-labeled biomolecule immobilized on a transparent layer placed on top of a mirror basal surface. The standing wave of the reflected emission light means that the height of the transparent layer operates as a surface-embedded optical filter for the fluorescence signal. FLIC extreme sensitivity to wavelength is also its main problem: small, e.g., 10 nm range, variations of the vertical position of the fluorophore can translate in unwanted suppression of the detection signal. Herein, we introduce the concept of quasi-circular lenticular microstructured domes operating as continuous-mode optical filters, generating fluorescent concentric rings, with diameters determined by the wavelengths of the fluorescence light, in turn modulated by FLIC. The critical component of the lenticular structures was the shallow sloping side wall, which allowed the simultaneous separation of fluorescent patterns for virtually any fluorophore wavelength. Purposefully designed microstructures with either stepwise or continuous-slope dome geometries were fabricated to modulate the intensity and the lateral position of a fluorescence signal. The simulation of FLIC effects induced by the lenticular microstructures was confirmed by the measurement of the fluorescence profile for three fluorescent dyes, as well as high-resolution fluorescence scanning using stimulated emission depletion (STED) microscopy. The high sensitivity of the spatially addressable FLIC technology was further validated on a diagnostically important target, i.e., the receptor-binding domain (RBD) of the SARS-Cov2 via the detection of RBD:anti-S1-antibody.
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Affiliation(s)
- Serban Dobroiu
- Department of Electrical Engineering & Electronics, University of Liverpool, Liverpool L69 3GJ, U.K
- Department of Bioengineering, McGill University, Montreal H3A 0C3, Canada
| | - Falco C M J M van Delft
- MiPlaza, Philips Research Europe, 5656 AE Eindhoven, The Netherlands
- Molecular Sense Ltd., Liverpool L36 8HT, U.K
| | | | - Shantoshini Dash
- Department of Bioengineering, McGill University, Montreal H3A 0C3, Canada
| | - Jenny Aveyard
- Department of Electrical Engineering & Electronics, University of Liverpool, Liverpool L69 3GJ, U.K
| | - Jeroen van Zijl
- MiPlaza, Philips Research Europe, 5656 AE Eindhoven, The Netherlands
| | - Jaap Snijder
- MiPlaza, Philips Research Europe, 5656 AE Eindhoven, The Netherlands
| | | | - Jurgen van Berkum
- MiPlaza, Philips Research Europe, 5656 AE Eindhoven, The Netherlands
| | - Marie Pierre Blanchard
- Montpellier Ressources Imagerie, BioCampus, University of Montpellier, CNRS, INSERM, 34000 Montpellier Cedex, France
| | - Cyril Favard
- Membrane Domains and Viral Assembly, Montpellier Infectious Disease Research Institute, CNRS UMR9004, 1919, route de Mende, 34293 Cedex Montpellier, France
| | - Dan V Nicolau
- Department of Electrical Engineering & Electronics, University of Liverpool, Liverpool L69 3GJ, U.K
- Department of Bioengineering, McGill University, Montreal H3A 0C3, Canada
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Li M, Aveyard J, Doherty KG, Deller RC, Williams RL, Kolegraff KN, Kaye SB, D’Sa RA. Antimicrobial Nitric Oxide-Releasing Electrospun Dressings for Wound Healing Applications. ACS Mater Au 2022; 2:190-203. [PMID: 36855758 PMCID: PMC9888637 DOI: 10.1021/acsmaterialsau.1c00056] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Nonhealing and chronic wounds represent a major problem for the quality of life of patients and have cost implications for healthcare systems. The pathophysiological mechanisms that prevent wound healing are usually multifactorial and relate to patient overall health and nutrition, vascularity of the wound bed, and coexisting infection/colonization. Bacterial infections are one of the predominant issues that can stall a wound, causing it to become chronic. Successful wound healing often depends on weeks or months of antimicrobial therapy, but this is problematic given the rise in multidrug-resistant bacteria. As such, alternatives to antibiotics are desperately needed to aid the healing of chronic, and even acutely infected wounds. Nitric oxide (NO) kills bacteria through a variety of mechanisms, and thus, bacteria have shown no tendency to develop resistance to NO as a therapeutic agent and therefore can be a good alternative to antibiotic therapy. In this paper, we report on the development of NO-releasing electrospun membranes fabricated from polycaprolactone (PCL)/gelatin blends and optimized to reduce bacterial infection. The NO payload in the membranes was directly related to the number of amines (and hence the amount of gelatin) in the blend. Higher NO payloads corresponded with a higher degree of antimicrobial efficacy. No cytotoxicity was observed for electrospun membranes, and an in vitro wound closure assay demonstrated closure within 16 h. The results presented here clearly indicate that these NO-releasing electrospun membranes hold significant promise as wound dressings due to their antimicrobial activity and biocompatibility.
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Affiliation(s)
- Man Li
- School
of Engineering, University of Liverpool, Liverpool L69 3GH, United Kingdom
| | - Jenny Aveyard
- School
of Engineering, University of Liverpool, Liverpool L69 3GH, United Kingdom
| | - Kyle G. Doherty
- Department
of Eye and Vision Science, Institute of Life Course and Medical Science, University of Liverpool, Liverpool L7 8TX, United Kingdom
| | - Robert C. Deller
- School
of Engineering, University of Liverpool, Liverpool L69 3GH, United Kingdom
| | - Rachel L. Williams
- Department
of Eye and Vision Science, Institute of Life Course and Medical Science, University of Liverpool, Liverpool L7 8TX, United Kingdom
| | - Keli N. Kolegraff
- Department
of Plastic and Reconstructive Surgery, The
Johns Hopkins University School of Medicine, 601 North Caroline Street, Baltimore, Maryland 21287, United States
| | - Stephen B. Kaye
- Department
of Eye and Vision Science, Institute of Life Course and Medical Science, University of Liverpool, Liverpool L7 8TX, United Kingdom
| | - Raechelle A. D’Sa
- School
of Engineering, University of Liverpool, Liverpool L69 3GH, United Kingdom,
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Rabe R, Hempel U, Martocq L, Keppler JK, Aveyard J, Douglas TEL. Dairy-Inspired Coatings for Bone Implants from Whey Protein Isolate-Derived Self-Assembled Fibrils. Int J Mol Sci 2020; 21:E5544. [PMID: 32756331 PMCID: PMC7432503 DOI: 10.3390/ijms21155544] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 07/24/2020] [Accepted: 07/28/2020] [Indexed: 12/15/2022] Open
Abstract
To improve the integration of a biomaterial with surrounding tissue, its surface properties may be modified by adsorption of biomacromolecules, e.g., fibrils. Whey protein isolate (WPI), a dairy industry by-product, supports osteoblastic cell growth. WPI's main component, β-lactoglobulin, forms fibrils in acidic solutions. In this study, aiming to develop coatings for biomaterials for bone contact, substrates were coated with WPI fibrils obtained at pH 2 or 3.5. Importantly, WPI fibrils coatings withstood autoclave sterilization and appeared to promote spreading and differentiation of human bone marrow stromal cells (hBMSC). In the future, WPI fibrils coatings could facilitate immobilization of biomolecules with growth stimulating or antimicrobial properties.
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Affiliation(s)
- Rebecca Rabe
- Division of Food Technology, Kiel University, 24118 Kiel, Germany; (R.R.); (J.K.K.)
| | - Ute Hempel
- Institute of Physiological Chemistry, Technische Universität Dresden, 01069 Dresden, Germany;
| | - Laurine Martocq
- Engineering Department, Lancaster University, Lancaster LA1 4YW, UK;
| | - Julia K. Keppler
- Division of Food Technology, Kiel University, 24118 Kiel, Germany; (R.R.); (J.K.K.)
- Laboratory of Food Process Engineering, Wageningen University & Research AFSG, 6708 PB Wageningen, The Netherlands
| | - Jenny Aveyard
- School of Engineering, University of Liverpool, Liverpool L69 3BX, UK;
| | - Timothy E. L. Douglas
- Engineering Department, Lancaster University, Lancaster LA1 4YW, UK;
- Materials Science Institute (MSI), Lancaster University, Lancaster LA1 4YW, UK
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Li M, Aveyard J, Fleming G, Curran JM, McBride F, Raval R, D'Sa RA. Nitric Oxide Releasing Titanium Surfaces for Antimicrobial Bone-Integrating Orthopedic Implants. ACS Appl Mater Interfaces 2020; 12:22433-22443. [PMID: 32320193 DOI: 10.1021/acsami.0c00871] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Titanium implants in orthopedic applications can fail due to infection and impaired integration into the host. Most research efforts that facilitate osseointegration of the implant have not considered infection, and vice versa. Moreover, most infection control measures involve the use of conventional antibiotics which contributes to the global epidemic of antimicrobial resistance. Nitric oxide (NO) is a promising alternative to antibiotics, and while researchers have investigated NO releasing coatings, there are few reports on the function/robustness or the mechanism of NO release. Our comprehensive mechanistic study has allowed us to design, characterize, and optimize NO releasing coatings to achieve maximum antimicrobial efficacy toward bacteria with minimum cytotoxicity to human primary osteoblasts in vitro. As the antibiotic era is coming to an end and the future of infection control continues to demand new alternatives, the coatings described herein represent a promising therapeutic strategy for use in orthopedic surgeries.
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Affiliation(s)
- Man Li
- School of Engineering, University of Liverpool, Liverpool L69 3GH, U.K
| | - Jenny Aveyard
- School of Engineering, University of Liverpool, Liverpool L69 3GH, U.K
| | - George Fleming
- School of Engineering, University of Liverpool, Liverpool L69 3GH, U.K
| | - Judith M Curran
- School of Engineering, University of Liverpool, Liverpool L69 3GH, U.K
| | - Fiona McBride
- The Open Innovation Hub for Antimicrobial Surfaces, Surface Science Research Centre, Department of Chemistry, University of Liverpool, Liverpool L69 3BX, U.K
| | - Rasmita Raval
- The Open Innovation Hub for Antimicrobial Surfaces, Surface Science Research Centre, Department of Chemistry, University of Liverpool, Liverpool L69 3BX, U.K
| | - Raechelle A D'Sa
- School of Engineering, University of Liverpool, Liverpool L69 3GH, U.K
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Aveyard J, Deller RC, Lace R, Williams RL, Kaye SB, Kolegraff KN, Curran JM, D'Sa RA. Antimicrobial Nitric Oxide Releasing Contact Lens Gels for the Treatment of Microbial Keratitis. ACS Appl Mater Interfaces 2019; 11:37491-37501. [PMID: 31532610 DOI: 10.1021/acsami.9b13958] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Microbial keratitis is a serious sight threatening infection affecting approximately two million individuals worldwide annually. While antibiotic eye drops remain the gold standard treatment for these infections, the significant problems associated with eye drop drug delivery and the alarming rise in antimicrobial resistance has meant that there is an urgent need to develop alternative treatments. In this work, a nitric oxide releasing contact lens gel displaying broad spectrum antimicrobial activity against two of the most common causative pathogens of microbial keratitis is described. The contact lens gel is composed of poly-ε-lysine (pεK) functionalized with nitric oxide (NO) releasing diazeniumdiolate moieties which enables the controlled and sustained release of bactericidal concentrations of NO at physiological pH over a period of 15 h. Diazeniumdiolate functionalization was confirmed by Fourier transform infrared (FTIR), and the concentration of NO released from the gels was determined by chemiluminescence. The bactericidal efficacy of the gels against Pseudomonas aeruginosa and Staphylococcus aureus was ascertained, and between 1 and 4 log reductions in bacterial populations were observed over 24 h. Additional cell cytotoxicity studies with human corneal epithelial cells (hCE-T) also demonstrated that the contact lens gels were not cytotoxic, suggesting that the developed technology could be a viable alternative treatment for microbial keratitis.
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Affiliation(s)
- Jenny Aveyard
- School of Engineering , University of Liverpool , Brownlow Hill , Liverpool L69 3GH , United Kingdom
| | - Robert C Deller
- School of Engineering , University of Liverpool , Brownlow Hill , Liverpool L69 3GH , United Kingdom
| | - Rebecca Lace
- Institute of Ageing and Chronic Diseases Department of Eye and Vision Science , University of Liverpool , Apex Building, West Derby Street , Liverpool L7 8TX , United Kingdom
| | - Rachel L Williams
- Institute of Ageing and Chronic Diseases Department of Eye and Vision Science , University of Liverpool , Apex Building, West Derby Street , Liverpool L7 8TX , United Kingdom
| | - Stephen B Kaye
- St Paul's Eye Unit, Department of Corneal and External Eye Diseases , Royal Liverpool University Hospital , Liverpool L7 8XP , United Kingdom
| | - Keli N Kolegraff
- Department of Plastic and Reconstructive Surgery , The Johns Hopkins University School of Medicine , 601 North Caroline Street , Baltimore , Maryland 21287 , United States
| | - Judith M Curran
- School of Engineering , University of Liverpool , Brownlow Hill , Liverpool L69 3GH , United Kingdom
| | - Raechelle A D'Sa
- School of Engineering , University of Liverpool , Brownlow Hill , Liverpool L69 3GH , United Kingdom
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Fleming G, Aveyard J, Fothergill JL, McBride F, Raval R, D'Sa RA. Nitric Oxide Releasing Polymeric Coatings for the Prevention of Biofilm Formation. Polymers (Basel) 2017; 9:polym9110601. [PMID: 30965904 PMCID: PMC6418929 DOI: 10.3390/polym9110601] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 10/30/2017] [Accepted: 11/08/2017] [Indexed: 01/14/2023] Open
Abstract
The ability of nitric oxide (NO)-releasing polymer coatings to prevent biofilm formation is described. NO-releasing coatings on (poly(ethylene terephthalate) (PET) and silicone elastomer (SE)) were fabricated using aminosilane precursors. Pristine PET and SE were oxygen plasma treated, followed by immobilisation of two aminosilane molecules: N-(3-(trimethoxysilyl)propyl)diethylenetriamine (DET3) and N-(3-trimethoxysilyl)propyl)aniline (PTMSPA). N-diazeniumdiolate nitric oxide donors were formed at the secondary amine sites on the aminosilane molecules producing NO-releasing polymeric coatings. The NO payload and release were controlled by the aminosilane precursor, as DET3 has two secondary amine sites and PTMSPA only one. The antibacterial efficacy of these coatings was tested using a clinical isolate of Pseudomonas aeruginosa (PA14). All NO-releasing coatings in this study were shown to significantly reduce P. aeruginosa adhesion over 24 h with the efficacy being a function of the aminosilane modification and the underlying substrate. These NO-releasing polymers demonstrate the potential and utility of this facile coating technique for preventing biofilms for indwelling medical devices.
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Affiliation(s)
- George Fleming
- Department of Mechanical, Materials and Aerospace Engineering, University of Liverpool, Liverpool L69 3GH, UK.
| | - Jenny Aveyard
- Department of Mechanical, Materials and Aerospace Engineering, University of Liverpool, Liverpool L69 3GH, UK.
| | - Joanne L Fothergill
- Institute of Infection and Global Health, University of Liverpool, 8 West Derby Street, Liverpool L69 7B3, UK.
| | - Fiona McBride
- The Open Innovation Hub for Antimicrobial Surfaces, Surface Science Research Centre, Department of Chemistry, University of Liverpool, Liverpool L69 3BX, UK.
| | - Rasmita Raval
- The Open Innovation Hub for Antimicrobial Surfaces, Surface Science Research Centre, Department of Chemistry, University of Liverpool, Liverpool L69 3BX, UK.
| | - Raechelle A D'Sa
- Department of Mechanical, Materials and Aerospace Engineering, University of Liverpool, Liverpool L69 3GH, UK.
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Michailidis M, Sorzabal-Bellido I, Adamidou EA, Diaz-Fernandez YA, Aveyard J, Wengier R, Grigoriev D, Raval R, Benayahu Y, D'Sa RA, Shchukin D. Modified Mesoporous Silica Nanoparticles with a Dual Synergetic Antibacterial Effect. ACS Appl Mater Interfaces 2017; 9:38364-38372. [PMID: 29022348 DOI: 10.1021/acsami.7b14642] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Application of mesoporous silica nanoparticles (MSNs) as antifouling/antibacterial carriers is limited and specifically with a dual synergetic effect. In the present work, MSNs modified with quaternary ammonium salts (QASs) and loaded with the biocide Parmetol S15 were synthesized as functional fillers for antifouling/antibacterial coatings. From the family of the MSNs, MCM-48 was selected as a carrier because of its cubic pore structure, high surface area, and high specific pore volume. The QASs used for the surface modification of MCM-48 were dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and dimethyltetradecyl[3-(triethoxysilyl)propyl]ammonium chloride. The QAS-modified MCM-48 reveals strong covalent bonds between the QAS and the surface of the nanoparticles. The surface functionalization was confirmed by Fourier transform infrared spectroscopy, thermogravimetric analysis, elemental analysis, and ζ-potential measurements. Additional loading of the QAS-modified MCM-48 with a commercially available biocide (Parmetol S15) resulted in a synergetic dual antibacterial/antifouling effect. Either loaded or unloaded QAS-modified MSNs exhibited high antibacterial performance confirming their dual activity. The QAS-modified MCM-48 loaded with the biocide Parmetol S15 killed all exposed bacteria after 3 h of incubation and presented 100% reduction at the antibacterial tests against Gram-negative and Gram-positive bacteria. Furthermore, the QAS-modified MCM-48 without Parmetol S15 presented 77-89% reduction against the exposed Gram-negative bacteria and 78-94% reduction against the exposed Gram-positive bacteria. In addition, the modified MCM-48 was mixed with coating formulations, and its antifouling performance was assessed in a field test trial in northern Red Sea. All synthesized paints presented significant antifouling properties after 5 months of exposure in real seawater conditions, and the dual antifouling effect of the nanoparticles was confirmed.
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Affiliation(s)
- Marios Michailidis
- Stephenson Institute for Renewable Energy, Department of Chemistry, University of Liverpool , Crown Street, Liverpool L69 7ZD, U.K
| | - Ioritz Sorzabal-Bellido
- Open Innovation Hub for Antimicrobial Surfaces at the Surface Science Research Centre, University of Liverpool , Oxford Street, L69 3BX Liverpool, U.K
| | - Evanthia A Adamidou
- Manchester Institute of Biotechnology, School of Chemical Engineering and Analytical Science, The University of Manchester , 131 Princess Street, M1 7DN Manchester, U.K
| | - Yuri Antonio Diaz-Fernandez
- Open Innovation Hub for Antimicrobial Surfaces at the Surface Science Research Centre, University of Liverpool , Oxford Street, L69 3BX Liverpool, U.K
| | - Jenny Aveyard
- Department of Mechanical, Materials and Aerospace Engineering, University of Liverpool , Liverpool L69 3GH, U.K
| | - Reut Wengier
- School of Zoology, George S. Wise Faculty of Life Sciences, Tel Aviv University , Ramat Aviv, Tel Aviv 69978, Israel
| | - Dmitry Grigoriev
- Fraunhofer Institute for Applied Polymer Research IAP Functional Protein Systems/Biotechnology , Geiselbergstrasse 69, 14476 Potsdam-Golm, Germany
| | - Rasmita Raval
- Open Innovation Hub for Antimicrobial Surfaces at the Surface Science Research Centre, University of Liverpool , Oxford Street, L69 3BX Liverpool, U.K
| | - Yehuda Benayahu
- School of Zoology, George S. Wise Faculty of Life Sciences, Tel Aviv University , Ramat Aviv, Tel Aviv 69978, Israel
| | - Raechelle A D'Sa
- Department of Mechanical, Materials and Aerospace Engineering, University of Liverpool , Liverpool L69 3GH, U.K
| | - Dmitry Shchukin
- Stephenson Institute for Renewable Energy, Department of Chemistry, University of Liverpool , Crown Street, Liverpool L69 7ZD, U.K
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Aveyard J, Bradley JW, McKay K, McBride F, Donaghy D, Raval R, D'Sa RA. Linker-free covalent immobilization of nisin using atmospheric pressure plasma induced grafting. J Mater Chem B 2017; 5:2500-2510. [PMID: 32264556 DOI: 10.1039/c7tb00113d] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The linker-free covalent immobilization of polymers on surfaces has the potential to impart new properties and functions to surfaces for a wide range of applications. However, most current methods for the production of these surfaces involve multiple chemical steps and do not have a high degree of control over the chemical functionalities at the surface. A comprehensive study detailing the facile two-step covalent grafting of the antimicrobial peptide nisin onto polystyrene surfaces is reported. Functionalization is achieved using an atmospheric pressure plasma jet, and the reaction is monitored and compared with a standard wet chemical functionalization approach using a variety of analytical techniques. The reactive species produced by the atmospheric pressure plasma jet were analyzed by mass spectrometry and optical emission spectroscopy. The surface chemistry and topography of the functionalized surfaces were determined using contact angle measurements, Fourier infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy and atomic force microscopy respectively. Following surface analysis, the antimicrobial efficacy of the covalently grafted nisin against two major food borne pathogens (Staphylococcus aureus and Listeria monocytogenes) was assessed at two different pHs. The results demonstrated that a post-plasma treatment step after nisin deposition is required to covalently graft the peptide onto the surface. The covalent immobilization of nisin resulted in a significant reduction in bacterial counts within a short 30 minutes contact time. These surfaces were also significantly more antimicrobial compared to those prepared via a more traditional wet chemical approach indicating that the reported method could be a less expensive and less time consuming alternative.
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Affiliation(s)
- Jenny Aveyard
- Department of Electrical Engineering and Electronics, University of Liverpool, L69 3GJ, UK.
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van Zalinge H, Ramsey LC, Aveyard J, Persson M, Mansson A, Nicolau DV. Surface-Controlled Properties of Myosin Studied by Electric Field Modulation. Langmuir 2015; 31:8354-8361. [PMID: 26161584 DOI: 10.1021/acs.langmuir.5b01549] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The efficiency of dynamic nanodevices using surface-immobilized protein molecular motors, which have been proposed for diagnostics, drug discovery, and biocomputation, critically depends on the ability to precisely control the motion of motor-propelled, individual cytoskeletal filaments transporting cargo to designated locations. The efficiency of these devices also critically depends on the proper function of the propelling motors, which is controlled by their interaction with the surfaces they are immobilized on. Here we use a microfluidic device to study how the motion of the motile elements, i.e., actin filaments propelled by heavy mero-myosin (HMM) motor fragments immobilized on various surfaces, is altered by the application of electrical loads generated by an external electric field with strengths ranging from 0 to 8 kVm(-1). Because the motility is intimately linked to the function of surface-immobilized motors, the study also showed how the adsorption properties of HMM on various surfaces, such as nitrocellulose (NC), trimethylclorosilane (TMCS), poly(methyl methacrylate) (PMMA), poly(tert-butyl methacrylate) (PtBMA), and poly(butyl methacrylate) (PBMA), can be characterized using an external field. It was found that at an electric field of 5 kVm(-1) the force exerted on the filaments is sufficient to overcome the frictionlike resistive force of the inactive motors. It was also found that the effect of assisting electric fields on the relative increase in the sliding velocity was markedly higher for the TMCS-derivatized surface than for all other polymer-based surfaces. An explanation of this behavior, based on the molecular rigidity of the TMCS-on-glass surfaces as opposed to the flexibility of the polymer-based ones, is considered. To this end, the proposed microfluidic device could be used to select appropriate surfaces for future lab-on-a-chip applications as illustrated here for the almost ideal TMCS surface. Furthermore, the proposed methodology can be used to gain fundamental insights into the functioning of protein molecular motors, such as the force exerted by the motors under different operational conditions.
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Affiliation(s)
| | | | | | - Malin Persson
- ‡Department of Chemistry and Biomedical Sciences, Linnaeus University, 39182 Kalmar, Sweden
| | - Alf Mansson
- ‡Department of Chemistry and Biomedical Sciences, Linnaeus University, 39182 Kalmar, Sweden
| | - Dan V Nicolau
- §Department of Bioengineering, McGill University, Montreal, H3A 0C3 Quebec, Canada
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van Zalinge H, Aveyard J, Hajne J, Persson M, Mansson A, Nicolau DV. Actin filament motility induced variation of resonance frequency and rigidity of polymer surfaces studied by quartz crystal microbalance. Langmuir 2012; 28:15033-15037. [PMID: 22988957 DOI: 10.1021/la302717y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
This contribution reports on the quantification of the parameters of the motility assays for actomyosin system using a quartz crystal microbalance (QCM). In particular, we report on the difference in the observed resonance frequency and dissipation of a quartz crystal when actin filaments are stationary as opposed to when they are motile. The changes in QCM measurements were studied for various polymer-coated surfaces functionalized with heavy meromyosin (HMM). The results of the QCM experiments show that the HMM-induced sliding velocity of actin filaments is modulated by a combination of the viscoelastic properties of the polymer layer including the HMM motors.
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Affiliation(s)
- Harm van Zalinge
- Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool, United Kingdom
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11
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Affiliation(s)
- Jenny Aveyard
- Department of Chemistry, Liverpool University, Liverpool L69 7ZD, U.K., and Department of Physics, Liverpool University, Liverpool L69 7ZE, U.K
| | - Paul Nolan
- Department of Chemistry, Liverpool University, Liverpool L69 7ZD, U.K., and Department of Physics, Liverpool University, Liverpool L69 7ZE, U.K
| | - Robert Wilson
- Department of Chemistry, Liverpool University, Liverpool L69 7ZD, U.K., and Department of Physics, Liverpool University, Liverpool L69 7ZE, U.K
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12
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Aveyard J, Mehrabi M, Cossins A, Braven H, Wilson R. One step visual detection of PCR products with gold nanoparticles and a nucleic acid lateral flow (NALF) device. Chem Commun (Camb) 2008:4251-3. [PMID: 18217596 DOI: 10.1039/b708859k] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [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
Specific PCR products are detected with an antibody-free lateral-flow device by sandwiching them between reporter oligonucleotides covalently attached to gold nanoparticles (GNPs) and capture oligonucleotides covalently attached to a nitrocellulose chromatographic strip.
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Affiliation(s)
- Jenny Aveyard
- Department of Chemistry, Liverpool University, Liverpool, L69 7ZD, UK
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Abstract
The dependence of the optical properties of spherical gold nanoparticles on particle size and wavelength were analyzed theoretically using multipole scattering theory, where the complex refractive index of gold was corrected for the effect of a reduced mean free path of the conduction electrons in small particles. To compare these theoretical results to experimental data, gold nanoparticles in the size range of 5 to 100 nm were synthesized and characterized with TEM and UV-vis. Excellent agreement was found between theory and experiment. It is shown that the data produced here can be used to determine both size and concentration of gold nanoparticles directly from UV-vis spectra. Equations for this purpose are derived, and the precision of various methods is discussed. The major aim of this work is to provide a simple and fast method to determine size and concentration of nanoparticles.
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Affiliation(s)
- Wolfgang Haiss
- Centre for Nanoscale Science, Department of Chemistry, School of Biological Sciences, University of Liverpool, Crown Street L69 7ZD, UK.
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Chen Y, Aveyard J, Wilson R. Gold and silver nanoparticles functionalized with known numbers of oligonucleotides per particle for DNA detection. Chem Commun (Camb) 2004:2804-5. [PMID: 15599415 DOI: 10.1039/b411181h] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The biospecificity of gold and silver nanoparticles, functionalized with known numbers of oligonucleotides, is demonstrated in colorimetric microbead assays for complementary and mismatch sequences.
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Affiliation(s)
- Yang Chen
- Department of Chemistry and Centre for Bioarray Innovation, Liverpool University, Liverpool, UK L69 7ZD
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Wilson R, Chen Y, Aveyard J. One molecule per particle method for functionalising nanoparticlesElectronic supplementary information (ESI) available: experimental details. See http://www.rsc.org/suppdata/cc/b4/b402786h/. Chem Commun (Camb) 2004:1156-7. [PMID: 15136816 DOI: 10.1039/b402786h] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A mean of one biotinylated dextran molecule per particle is conjugated to 15 nm gold nanoparticles, by a process of self-assembly, which depends on the relationship between dextran molecular weight and particle size.
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Affiliation(s)
- Robert Wilson
- Department of Chemistry, Liverpool University, Liverpool, UK.
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Randerson-Moor JA, Harland M, Williams S, Cuthbert-Heavens D, Sheridan E, Aveyard J, Sibley K, Whitaker L, Knowles M, Bishop JN, Bishop DT. A germline deletion of p14(ARF) but not CDKN2A in a melanoma-neural system tumour syndrome family. Hum Mol Genet 2001; 10:55-62. [PMID: 11136714 DOI: 10.1093/hmg/10.1.55] [Citation(s) in RCA: 179] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The melanoma-astrocytoma syndrome is characterized by a dual predisposition to melanoma and neural system tumours, commonly astrocytoma. Germline deletions of the region on 9p21 containing the CDKN2A and CDKN2B genes and CDKN2A exon 1beta have been reported in kindreds, implicating contiguous tumour suppressor gene deletion as a cause of this syndrome. We describe a family characterized by multiple melanoma and neural cell tumours segregating with a germline deletion of the p14(ARF)-specific exon 1beta of the CDKN2A gene. This deletion does not affect the coding or minimal promoter sequences of either the CDKN2A or CDKN2B genes. Our results are consistent with either: (i) loss of p14(ARF) function being the critical abnormality associated with this syndrome, rather than contiguous loss of both the CDKN2A and CDKN2B genes as suggested previously; or (ii) disruption of expression of p16 by mechanisms as yet unknown.
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Affiliation(s)
- J A Randerson-Moor
- ICRF Genetic Epidemiology Division, ICRF Clinical Centre in Leeds, Cancer Genetics Building, St James's University Hospital, Beckett Street, Leeds LS9 7TF, UK
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