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Ghaffari S, Amiri N, Felix DF, Abbasidezfouli S, Franco F, Beaupré SL, Branda NR, Lange D. Surface photosterilization of implantable silicone biomaterials: structural and functional characterization. Colloids Surf B Biointerfaces 2024; 233:113637. [PMID: 37979481 DOI: 10.1016/j.colsurfb.2023.113637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2023] [Revised: 10/16/2023] [Accepted: 11/06/2023] [Indexed: 11/20/2023]
Abstract
Hospital-acquired infections (HAIs) remain one of the major challenges faced by the global healthcare system. The increasing rate of pathogenic resistance against antibiotics suggests that alternative treatments are needed to control recurrent infections. Catheter-associated urinary tract infections (CAUTIs) are the third most common type of HAI worldwide, and this is mainly due to indwelling devices being excellent substrates for bacterial adhesion and growth. Subsequent biofilm formation on the implant surface acts as a constant nidus of bacteria and infection, thereby contributing to increased rates of patient morbidity and mortality. Here, we propose a simple and cost-effective method to sterilize silicone-based implant surfaces and prevent initial bacterial colonization, using Polydimethylsiloxane (PDMS) and an embedded ruthenium photosensitizer (PS). Exposure to LED light triggers potent photokilling action, resulting in significant bactericidal activity as evidenced by the number of adherent bacteria being below the level of detection (<10 CFU/mL) after 24 h. Live/dead staining studies using fluorescence microscopy indicated significant reduction in surface-adhered bacterial growth and biofilm formation. This potent antibacterial activity was verified in vivo, with exposure of contaminated PDMS coupons containing PS to LED prior to implantation resulting in over 99.5% reduction in adherent bacteria compared to controls over the 3-day implantation period. Histological analysis of the implantation site of PDMS+PS samples, in the absence of bacteria, revealed no adverse reactions. This was also confirmed using in vitro cytotoxicity studies. Tensile strength, surface roughness, hydrophobicity, and the development of encrustation of surface-treated groups exhibit comparable or improved properties to bare PDMS.
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Affiliation(s)
- Sahand Ghaffari
- The Stone Centre at VGH, Department of Urologic Sciences, University of British Columbia, Jack Bell Research Centre, 550-3, 2660 Oak Street, Vancouver V6H 3Z6, BC, Canada.
| | - Nafise Amiri
- ICORD and Department of Pathology and Laboratory Medicine, University of British Columbia, 818 W10th Ave, Vancouver V5Z 1M9, Canada.
| | - Demian F Felix
- The Stone Centre at VGH, Department of Urologic Sciences, University of British Columbia, Jack Bell Research Centre, 550-3, 2660 Oak Street, Vancouver V6H 3Z6, BC, Canada.
| | - Samin Abbasidezfouli
- The Stone Centre at VGH, Department of Urologic Sciences, University of British Columbia, Jack Bell Research Centre, 550-3, 2660 Oak Street, Vancouver V6H 3Z6, BC, Canada.
| | - Fernanda Franco
- 4D LABS and Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada.
| | - Scott L Beaupré
- Department of Physics, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada.
| | - Neil R Branda
- 4D LABS and Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada.
| | - Dirk Lange
- The Stone Centre at VGH, Department of Urologic Sciences, University of British Columbia, Jack Bell Research Centre, 550-3, 2660 Oak Street, Vancouver V6H 3Z6, BC, Canada.
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Aitchison CM, Sachs M, Little MA, Wilbraham L, Brownbill NJ, Kane CM, Blanc F, Zwijnenburg MA, Durrant JR, Sprick RS, Cooper AI. Structure–activity relationships in well-defined conjugated oligomer photocatalysts for hydrogen production from water. Chem Sci 2020. [DOI: 10.1039/d0sc02675a] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Oligomer chain length and backbone twisting were found to have a strong effect on optoelectronic properties but a trimer of dibenzo[b,d]thiophene sulfone was found to have high photocatalytic activity approaching that of its polymer analogue.
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Affiliation(s)
- Catherine M. Aitchison
- Department of Chemistry and Materials Innovation Factory
- University of Liverpool
- Liverpool L7 3NY
- UK
| | - Michael Sachs
- Department of Chemistry and Centre for Processable Electronics
- Imperial College London
- London W12 0BZ
- UK
| | - Marc A. Little
- Department of Chemistry and Materials Innovation Factory
- University of Liverpool
- Liverpool L7 3NY
- UK
| | - Liam Wilbraham
- Department of Chemistry
- University College London
- London WC1H 0AJ
- UK
| | - Nick J. Brownbill
- Department of Chemistry and Materials Innovation Factory
- University of Liverpool
- Liverpool L7 3NY
- UK
- Stephenson Institute for Renewable Energy
| | - Christopher M. Kane
- Department of Chemistry and Materials Innovation Factory
- University of Liverpool
- Liverpool L7 3NY
- UK
| | - Frédéric Blanc
- Department of Chemistry and Materials Innovation Factory
- University of Liverpool
- Liverpool L7 3NY
- UK
- Stephenson Institute for Renewable Energy
| | | | - James R. Durrant
- Department of Chemistry and Centre for Processable Electronics
- Imperial College London
- London W12 0BZ
- UK
| | - Reiner Sebastian Sprick
- Department of Chemistry and Materials Innovation Factory
- University of Liverpool
- Liverpool L7 3NY
- UK
- Department of Pure and Applied Chemistry
| | - Andrew I. Cooper
- Department of Chemistry and Materials Innovation Factory
- University of Liverpool
- Liverpool L7 3NY
- UK
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Sahar A, Ali S, Hussain T, Irfan M, Eliasson B, Iqbal J. UV absorbers for cellulosic apparels: A computational and experimental study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 188:355-361. [PMID: 28753529 DOI: 10.1016/j.saa.2017.07.037] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2017] [Revised: 07/09/2017] [Accepted: 07/20/2017] [Indexed: 06/07/2023]
Abstract
Two triazine based Ultra Violet (UV) absorbers Sulfuric acid mono-(2-{4-[4-chloro-6-(4-{4-chloro-6-[4-(2-sulfooxy-ethanesulfonyl)-phenylamino]-[1,3,5] triazin-2-ylamino-phenylamino)-[1,3,5]triazin-2-ylamino]-benzenesulfonyl}-ethyl) ester (1a) and 4-{4-chloro-6-[4-(2-sulfooxy-ethanesulfonyl)-phenylamino]-[1,3,5] triazin-2-ylamino}-2-[4-chloro-6-(2-sulfooxy-ethanesulfonyl)-[1,3,5]triazin-2-ylamino]-benzenesulfonic acid (2a) with different substituents were designed computationally. The influence of different substituents on the electrochemical properties and UV spectra of the absorbers was investigated. The presence of electron deficient unit in 1a to the molecular core significantly reduces the LUMO levels and energy gap. The designed absorbers were synthesized via condensation reaction and characterized by UV-Vis, FT-IR, MS studies. The performance of synthesized compounds as UV absorbers and their fastness properties were assessed by finishing the cotton fabric through exhaust method at different concentration and results appeared in good range.
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Affiliation(s)
- Anum Sahar
- Department of Chemistry, University of Agriculture, Faisalabad, Pakistan
| | - Shaukat Ali
- Department of Chemistry, University of Agriculture, Faisalabad, Pakistan.
| | - Tanveer Hussain
- Department of Textile Processing, National Textile University, Faisalabad, Pakistan
| | - Muhammad Irfan
- Department of Chemistry, University of Agriculture, Faisalabad, Pakistan
| | - Bertil Eliasson
- Department of Chemistry, Umeå University, Umeå 90187, Sweden
| | - Javed Iqbal
- Department of Chemistry, University of Agriculture, Faisalabad, Pakistan; Punjab Bio-energy Institute, University of Agriculture, Faisalabad, Pakistan.
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Hammond BR, Johnson BA, George ER. Oxidative photodegradation of ocular tissues: beneficial effects of filtering and exogenous antioxidants. Exp Eye Res 2014; 129:135-50. [PMID: 25236792 DOI: 10.1016/j.exer.2014.09.005] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Revised: 09/11/2014] [Accepted: 09/13/2014] [Indexed: 01/17/2023]
Abstract
The fact that light is necessary for life is generally accepted as an axiom. The extent to which light interacts and influences human biology, however, is often not fully appreciated. Exposure to sunlight, for instance, can both promote and degrade human health. There is now general scientific consensus that, although the eye evolved to respond to light, it is also damaged by excessive exposure. Light-mediated ocular damage is involved in the pathophysiology of many common forms of blindness. The type of ocular tissue damage induced by light exposure depends on the extent of exposure and wavelength. The tissues of the lens, cornea, and retina contain specific chemical moieties that have been proven to exhibit light-mediated oxidative degradation. Proteins and lipids present in the cornea, lens, and retina, meet all of the physical requirements known to initiate the process of oxidative photodegradation upon exposure to solar radiation. As such, different mechanisms have evolved in the lens, cornea, and retina to ameliorate such light-mediated oxidative damage. It appears, however, that such mechanisms are ill-matched to handle modern conditions: namely, poor diet and longer life-spans (and the degenerative diseases that accompany them). Hence, steps must be taken to protect the eye from the damaging effects of light. Preventative measures include minimizing actinic light exposure, providing exogenous filtering (e.g., through the use of protective lenses), and enhancing antioxidant defenses (e.g., through increased dietary intake of antioxidants). These strategies may yield long-term benefits in terms of reducing oxidative photodegradation of the ocular tissues.
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Affiliation(s)
- Billy R Hammond
- Vision Sciences Laboratory, University of Georgia, Athens, GA 30602-3013, USA.
| | - Bart A Johnson
- Johnson & Johnson Vision Care, Inc., 7500 Centurion Parkway, R&D 3rd Floor W3A, Jacksonville, FL 33256, USA
| | - Eric R George
- Johnson & Johnson Vision Care, Inc., 7500 Centurion Parkway, R&D 3rd Floor W3A, Jacksonville, FL 33256, USA.
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