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antimicrobial coating

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https://www.readbyqxmd.com/read/28213538/colonization-and-transmission-of-the-gut-microbiota-of-the-burying-beetle-nicrophorus-vespilloides-through-development
#1
Yin Wang, Daniel E Rozen
Carrion beetles in the genus Nicrophorus rear their offspring on decomposing carcasses where larvae are exposed to a diverse community of decomposer bacteria. Parents coat the carcass with antimicrobial secretions prior to egg hatch (defined as Pre-Hatch care) and also feed regurgitated food, and potentially bacteria, to larvae throughout development (defined as Full care). Here we partition the roles of pre- and post-hatch parental care in the transmission and persistence of culturable symbiotic bacteria to larvae...
February 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28211996/alternating-current-electrophoretic-deposition-for-the-immobilization-of-antimicrobial-agents-on-titanium-implant-surfaces
#2
Annabel Braem, Katrijn De Brucker, Nicolas Delattin, Manuela Sonja Killian, Maarten B J Roeffaers, Tomohiko Yoshioka, Satoshi Hayakawa, Patrik Schmuki, Bruno P A Cammue, Sannakaisa Virtanen, Karin Thevissen, Bram Neirinck
One prominent cause of implant failure is infection, therefore research is focusing on developing surface coatings that render the surface resistant to colonization by micro-organisms. Permanently attached coatings of antimicrobial molecules are of particular interest because of the reduced cytoxicity and lower risk of developing resistance compared to controlled release coatings. In this study, we focus on the chemical grafting of bioactive molecules on titanium. To concentrate the molecules at the metallic implant surface, we propose electrophoretic deposition (EPD) applying alternating current (AC) signals with an asymmetrical wave shape...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211702/antimicrobial-effect-of-biocompatible-silicon-nanoparticles-activated-by-therapeutic-ultrasound
#3
Svetlana N Shevchenko, Markus Burkhardt, Eugene V Sheval, Ulyana A Natashina, Christina Große, Alexander L Nikolaev, Alexander V Gopin, Ute Neugebauer, Andrew A Kudryavtsev, Vladimir Sivakov, Liubov Andreevna Osminkina
In this study, we report on a method for suppressing of Escherichia coli (E.coli) vitality by means of therapeutic ultrasound irradiation (USI) using biocompatible silicon nanoparticles as cavitation sensitizers. Silicon nanoparticles without (SiNPs) and with polysaccharide (dextran) coating (DSiNPs) were used. Both types of nanoparticles were non-toxic to Hep 2 cells up to concentration of 2 mg/ml. The treatment of bacteria with nanoparticles and application of 1 W/cm2 USI resulted in reduction of their viability up to 35% and 72% for SiNPs and DSiNPs, respectively...
February 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28197990/a-chlorhexidine-releasing-epoxy-based-coating-on-titanium-implants-prevents-staphylococcus-aureus-experimental-biomaterial-associated-infection
#4
M Riool, A J Dirks, V Jaspers, L de Boer, T J Loontjens, C M van der Loos, S Florquin, I Apachitei, L N Rijk, H A Keul, S A Zaat
Prevention of biomaterial-associated infections (BAI) remains a challenging problem, in particular due to the increased risk of resistance development with the current antibiotic-based strategies. Metallic orthopaedic devices, such as non-cemented implants, are often inserted under high mechanical stress. These non-cemented implants cannot be protected by e.g. antibioticreleasing bone cement or other antimicrobial approaches, such as the use of bioactive glass. Therefore, in order to avoid abrasion during implantation procedures, we developed an antimicrobial coating with great mechanical stability for orthopaedic implants, to prevent Staphylococcus aureus BAI...
February 14, 2017: European Cells & Materials
https://www.readbyqxmd.com/read/28192654/self-assembly-of-recombinant-silk-as-a-strategy-for-chemical-free-formation-of-bioactive-coatings-a-real-time-study
#5
Linnea Nilebäck, Jesper Niels Hedin, Mona Widhe, Lotta S Floderus, Annika Krona, Helena Bysell, My Hedhammar
Functionalization of biomaterials with biologically active peptides can improve their performance after implantation. By genetic fusion to self-assembling proteins, the functional peptides can easily be presented on different physical formats. Herein, a chemical-free coating method based on self-assembly of the recombinant spider silk protein 4RepCT is described and used to prepare functional coatings on various biomaterial surfaces. The silk assembly on surfaces was studied in real-time, revealing occurrence of continuous assembly of silk proteins onto surfaces and formation of nanofibrillar structures...
February 13, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28191006/capability-of-neutrophils-to-form-nets-is-not-directly-influenced-by-a-cma-targeting-peptide
#6
Christian Maueröder, Nicolas Schall, Frédéric Meyer, Aparna Mahajan, Benjamin Garnier, Jonas Hahn, Deborah Kienhöfer, Markus H Hoffmann, Sylviane Muller
During inflammatory reaction, neutrophils exhibit numerous cellular and immunological functions, notably the formation of neutrophil extracellular traps (NETs) and autophagy. NETs are composed of decondensed chromatin fibers coated with various antimicrobial molecules derived from neutrophil granules. NETs participate in antimicrobial defense and can also display detrimental roles and notably trigger some of the immune features of systemic lupus erythematosus (SLE) and other autoimmune diseases. Autophagy is a complex and finely regulated mechanism involved in the cell survival/death balance that may be connected to NET formation...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28188877/laser-deposition-of-poly-3-hydroxybutyric-acid-co-3-hydroxyvaleric-acid-lysozyme-microspheres-based-coatings-with-anti-microbial-properties
#7
V Grumezescu, A M Holban, L E Sima, M B Chiritoiu, G N Chiritoiu, A M Grumezescu, L Ivan, F Safciuc, F Antohe, C Florica, C R Luculescu, M C Chifiriuc, G Socol
The purpose of this study was to obtain, characterize and evaluate the cytotoxicity and antimicrobial activity of coatings based on poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) - Lysozyme (P(3HB-3HV)/Lys) and P(3HB-3HV) - Polyethylene glycol - Lysozyme (P(3HB-3HV)/PEG/Lys) spheres prepared by Matrix Assisted Pulsed Laser Evaporation (MAPLE) technique, in order to obtain functional and improved Ti-based implants. Morphological investigation of the coatings by Infrared Microscopy (IRM) and SEM revealed that the average diameter of P(3HB-3HV)/Lys spheres is around 2μm and unlike the drop cast samples, IRM recorded on MAPLE films revealed a good distribution of monitored functional groups on the entire scanned surface...
February 7, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28183675/mechanistic-investigation-on-microbial-toxicity-of-nano-hydroxyapatite-on-implant-associated-pathogens
#8
K Baskar, T Anusuya, G Devanand Venkatasubbu
The use of atomic scale inorganic nanoparticles (NPs) to fight against pathogenic microorganisms is a recent trend in biomedical area which overcomes the limitations of organic compounds in terms of stability, shelf life and bioactivity. One such Calcium phosphate based biomaterial is hydroxyapatite (HA), considered as potential bioactive compound with excellent biocompatibility, osteointegrity and biodegradability. Osteomyelitis, the implant associated infection, is the major problem worldwide responsible for the majority of implant failure cases...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183643/silver-deposited-carboxymethyl-chitosan-grafted-magnetic-nanoparticles-as-dual-action-deliverable-antimicrobial-materials
#9
Duc-Thang Vo, Sabrina Sabrina, Cheng-Kang Lee
Carboxymethyl chitosan (CMCS) was known to have a much better antimicrobial activity than chitosan due to the increased cationic -NH3(+) groups resulted from the intra- and intermolecular interactions between the carboxyl and amino groups. CMCS was grafted onto the surface of silica coated magnetic nanoparticles (MNPs) to obtain magnetically retrievable and deliverable antimicrobial nanoparticles (MNPs@CMCS). The presence of carboxylate groups in CMCS not only enhanced antimicrobial activity but also enabled Ag ions chelating ability to induce the in situ formation of Ag nanoparticles (AgNPs)...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183617/physical-chemical-and-antimicrobial-evaluation-of-a-composite-material-containing-quaternary-ammonium-salt-for-braces-cementation
#10
Mari Miura Sugii, Fábio Augusto de Souza Ferreira, Karina Cogo Müller, Debora Alves Nunes Leite Lima, Francisco Carlos Groppo, Hidetake Imasato, Ubirajara Pereira Rodrigues-Filho, Flávio Henrique Baggio Aguiar
The antibiofilm effect of iodide quaternary ammonium methacryloxy silicate (IQAMS) in Transbond XT Light Cure Adhesive resin used for braces cementation was evaluated. Fourier Transform Infrared (FTIR) spectroscopy confirmed IQAMS formation and Scanning Electron Microscopy coupled to Energy-Dispersive X-ray Spectroscopy (SEM-EDS) revealed that as coating, the quaternary ammonium groups from IQAMS were homogeneously dispersed throughout the surface. When incorporated, the composite material presented homogeneous dispersion throughout the resin...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28181353/antimicrobial-effect-frictional-resistance-and-surface-roughness-of-stainless-steel-orthodontic-brackets-coated-with-nanofilms-of-silver-and-titanium-oxide-a-preliminary-study
#11
Tania Ghasemi, Valiollah Arash, Vahid Rakhshan, Mahmoud Rabiee, Ramezan Rajab Nia, Fatemeh Majd Zadeh, Amir Hossein Pour Zare, Mana Shamsedin, Samira Kavoli
Nano-silver and nano-titanium oxide films can be coated over brackets in order to reduce bacterial aggregation and friction. However, their antimicrobial efficacy, surface roughness, and frictional resistance are not assessed before. Fifty-five stainless-steel brackets were divided into 5 groups of 11 brackets each: uncoated brackets, brackets coated with 60 µm silver, 100 µm silver, 60 µm titanium, and 100 µm titanium. Coating was performed using physical vapor deposition method. For friction test, three brackets from each group were randomly selected and tested...
February 9, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28178372/antimicrobial-activities-of-phenolic-extracts-derived-from-seed-coats-of-selected-soybean-varieties
#12
Rajaa Abutheraa, Navam Hettiarachchy, Geetha Kumar-Phillips, Ronny Horax, Pengyin Chen, Ruben Morawicki, Young Min Kwon
Soybean hulls or seed coats consist of complex carbohydrates, proteins, lipids, and polyphenols such as anthocyanidins, proanthocyanidins, and isoflavones. The polyphenolics in the seed coats give them various colors such as black, brown, green, yellow, or even a mottled appearance. In this study, the antimicrobial effects of phenolic extracts from the seed coats of different colored soybeans (yellow, dark brown, brown, and black) were evaluated against foodborne pathogens such as Salmonella Typhimurium, Escherichia coli O157:H7, and Campylobacter jejuni in broth-cultures as well as on chicken skin...
February 8, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28167107/investigation-on-curcumin-nanocomposite-for-wound-dressing
#13
G Devanand Venkatasubbu, T Anusuya
Curcuma longa (turmeric) has a long history of use in medicine as a treatment for inflammatory conditions. The primary active constituent of turmeric and the one responsible for its vibrant yellow color is curcumin. Curcumin is used for treatment of wound and inflammation. It had antimicrobial and antioxidant property. It has low intrinsic toxicity and magnificent properties like with comparatively lesser side-effects. Cotton cloth is one of the most successful wound dressings which utilize the intrinsic properties of cotton fibers...
February 3, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28165702/octadecyl-chains-immobilized-onto-hyaluronic-acid-coatings-by-thiol-ene-click-chemistry-increase-the-surface-antimicrobial-properties-and-prevent-platelet-adhesion-and-activation-to-polyurethane
#14
Helena P Prado Felgueiras, Li-Mei Wang, Ke-Feng Ren, Micaela M Querido, Qiao Jin, Mário Barbosa, Jian Ji, M Cristina L Martins
Infection and thrombus formation are still the biggest challenges for the success of blood contact medical devices. This work aims the development of an antimicrobial and hemocompatible biomaterial coating through which selective binding of albumin (passivant protein) from the blood stream is promoted and, thus, adsorption of other proteins responsible for bacterial adhesion and thrombus formation can be prevented. Polyurethane (PU) films were coated with hyaluronic acid, an antifouling agent, that was previously modified with thiol groups (HA-SH), using polydopamine as the binding agent...
February 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28156093/the-mechanism-of-action-of-a-membrane-active-quinoline-based-antimicrobial-on-natural-and-model-bacterial-membranes
#15
Alasdair Thomas Macadam Hubbard, Robert David Barker, Reg Paul Rehal, Kalliopi-Kelli A Vandera, Richard D Harvey, Anthony R Milnes Coates
HT61 is a quinoline-derived antimicrobial, which exhibits bactericidal potency against both multiplying and quiescent methicillin resistant and sensitive Staphylococcus aureus, and has been proposed as an adjunct for other antimicrobials in order to extend their usefulness in the face of increasing antimicrobial resistance. In this study we have examined HT61's effect on the permeability of Staphylococcus aureus membranes and whether this putative activity can be attributed to an interaction with lipid bilayers...
February 3, 2017: Biochemistry
https://www.readbyqxmd.com/read/28150937/nontoxic-cationic-coumarin-polyester-coatings-prevent-pseudomonas-aeruginosa-biofilm-formation
#16
Elaheh A Chamsaz, Steven Mankoci, Hazel A Barton, Abraham Joy
The rapid increase in bacterial infections and antimicrobial resistance is a growing public health concern. Infections arising from bacterial contamination of surgical tools, medical implants, catheters, and hospital surfaces can potentially be addressed by antimicrobial polymeric coatings. The challenge in developing such polymers for in vivo use is the ability to achieve high antimicrobial efficacy while at the same time being nontoxic to human cells. Although several classes of antimicrobial polymers have been developed, many of them cannot be used in the clinical setting due to their nonselective toxicity toward bacteria and mammalian cells...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28150092/antimicrobial-activity-study-of-triclosan-loaded-wbpu-on-proteus-mirabilis-in-vitro
#17
Ye Tian, Zhongyu Jian, Jianzhong Wang, Wei He, Qinyu Liu, Kunjie Wang, Hong Li, Hong Tan
OBJECTIVES: To evaluate the antimicrobial activity study of triclosan-loaded waterborne polyurethanes (WBPU) on Proteus mirabilis in vitro. MATERIALS AND METHODS: Inhibition zone assays on petri plates with triclosan-loaded WBPU samples were used to test its antimicrobial activity on Proteus mirabilis. Models of the catheterized bladder supplied with artificial urine infected with Proteus mirabilis were employed to confirm the antimicrobial activity of triclosan-loaded WBPU...
February 1, 2017: International Urology and Nephrology
https://www.readbyqxmd.com/read/28145683/evidence-for-the-phospholipid-sponge-effect-as-the-biocidal-mechanism-in-surface-bound-polyquaternary-ammonium-coatings-with-variable-cross-linking-density
#18
Jing Gao, Evan M White, Qiaohong Liu, Jason Locklin
Poly quaternary "-oniums" derived from polyethylenimine (PEI), poly(vinyl-N-alkylpyridinium), or chitosan belong to a class of cationic polymers that are efficient antimicrobial agents. When dissolved in solution, the positively charged polycations are able to displace the divalent cations of the cellular phospholipid bilayer and disrupt the ionic cross-links and structural integrity of the membrane. However, when immobilized to a surface where confinement limits diffusion, poly -oniums still show excellent antimicrobial activity, which implies a different biocidal mode of action...
February 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28140564/mussel-inspired-multifunctional-hydrogel-coating-for-prevention-of-infections-and-enhanced-osteogenesis
#19
Hao Cheng, Kan Yue, Mehdi Kazemzadeh-Narbat, Yanhui Liu, Akbar Khalilpour, Bingyun Li, Yu Shrike Zhang, Nasim Annabi, Ali Khademhosseini
Prevention of post-surgery infection and promotion of bio-integration are the key factors to achieve long-term success in orthopaedic implants. Localized delivery of antibiotics and bioactive molecules by the implant surface serves as a promising approach towards these goals. However, previously reported methods for surface functionalization of the titanium (Ti) alloy implants to load bioactive ingredients suffer from time-consuming complex processes and lack of long-term stability. Here, we present the design and characterization of an adhesive, osteoconductive, and antimicrobial hydrogel coating for Ti implants...
January 31, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28134392/chitosan-based-water-propelled-micromotors-with-strong-antibacterial-activity
#20
Jorge A M Delezuk, Doris E Ramírez-Herrera, Berta Esteban-Fernández de Ávila, Joseph Wang
A rapid and efficient micromotor-based bacteria killing strategy is described. The new antibacterial approach couples the attractive antibacterial properties of chitosan with the efficient water-powered propulsion of magnesium (Mg) micromotors. These Janus micromotors consist of Mg microparticles coated with the biodegradable and biocompatible polymers poly(lactic-co-glycolic acid) (PLGA), alginate (Alg) and chitosan (Chi), with the latter responsible for the antibacterial properties of the micromotor. The distinct speed and efficiency advantages of the new micromotor-based environmentally friendly antibacterial approach have been demonstrated in various control experiments by treating drinking water contaminated with model Escherichia coli (E...
January 30, 2017: Nanoscale
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