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https://www.readbyqxmd.com/read/27920430/biomimetic-antimicrobial-cloak-by-graphene-oxide-agar-hydrogel
#1
Massimiliano Papi, Valentina Palmieri, Francesca Bugli, Marco De Spirito, Maurizio Sanguinetti, Carlotta Ciancico, Maria Chiara Braidotti, Silvia Gentilini, Luca Angelani, Claudio Conti
Antibacterial surfaces have an enormous economic and social impact on the worldwide technological fight against diseases. However, bacteria develop resistance and coatings are often not uniform and not stable in time. The challenge is finding an antibacterial coating that is biocompatible, cost-effective, not toxic, and spreadable over large and irregular surfaces. Here we demonstrate an antibacterial cloak by laser printing of graphene oxide hydrogels mimicking the Cancer Pagurus carapace. We observe up to 90% reduction of bacteria cells...
December 2016: Scientific Reports
https://www.readbyqxmd.com/read/27919809/effect-of-novel-bioactive-edible-coatings-based-on-jujube-gum-and-nettle-oil-loaded-nanoemulsions-on-the-shelf-life-of-beluga-sturgeon-fillets
#2
Seyed Mohammad Taghi Gharibzahedi, Sara Mohammadnabi
Effect of jujube gum (JG; 4, 8 and 12% wt)-based nanoemulsions (NEs) containing nettle essential oil (NEO; 2, 3.5 and 5% wt) as new edible coatings was investigated to preserve Beluga sturgeon fillets (BSFs) during 15 day-refrigerated storage at 4°C. Physical (weight loss, cooking loss, color and texture), chemical (pH, FFA, PV, TBARS and TVB-N), microbiological (total and psychrotrophic bacterial counts), and sensorial characteristics of BSFs were kinetically analyzed. Preliminary studies showed that the NEs formulated with NEO lower than 5% at all JG concentrations were able to form stable coating solutions owing to the highest short-term stability (>90%) and entrapment efficiency (94...
December 2, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27918999/effect-of-silver-nanoparticles-on-the-metabolic-rate-hematological-response-and-survival-of-juvenile-white-shrimp-litopenaeus-vannamei
#3
Karla Juarez-Moreno, Claudio Humberto Mejía-Ruiz, Fernando Díaz, Horacio Reyna-Verdugo, Ana Denisse Re, Edgar F Vazquez-Felix, Edna Sánchez-Castrejón, Josué D Mota-Morales, Alexey Pestryakov, Nina Bogdanchikova
White spot syndrome virus (WSSV) is highly lethal and contagious in shrimps; its outbreaks causes an economic crisis for aquaculture. Several attempts have been made to treat this disease; however, to date, there is no effective cure. Because of their antimicrobial activities, silver nanoparticles (AgNPs) are the most studied nanomaterial. Although the antiviral properties of AgNPs have been studied, their antiviral effect against viral infection in aquaculture has not been reported. The AgNPs tested herein are coated with polyvinylpyrrolidone (PVP) and possess multiple international certifications for their use in veterinary and human applications...
December 2, 2016: Chemosphere
https://www.readbyqxmd.com/read/27916738/a-review-of-the-recent-advances-in-antimicrobial-coatings-for-urinary-catheters
#4
REVIEW
Priyadarshini Singha, Jason Locklin, Hitesh Handa
: More than 75% of hospital-acquired or nosocomial urinary tract infections are initiated by urinary catheters, which are used during the treatment of 15-25% of hospitalized patients. Among other purposes, urinary catheters are primarily used for draining urine after surgeries and for urinary incontinence. During catheter-associated urinary tract infections, bacteria travel up to the bladder and cause infection. A major cause of catheter-associated urinary tract infection is attributed to the use of non-ideal materials in the fabrication of urinary catheters...
December 1, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27916357/triclosan-sutures-for-surgical-site-infection-in-colorectal-cancer
#5
Kanefumi Yamashita, Shinsuke Takeno, Seiichiro Hoshino, Hironari Shiwaku, Naoya Aisu, Yoichiro Yoshida, Syu Tanimura, Yuichi Yamashita
BACKGROUND: Among all procedures, surgical site infections (SSIs) in colorectal surgery continue to have the highest rate, accounting for 5%-45%. To prevent the bacterial colonization of suture material, which disables local mechanisms of wound decontamination, triclosan-coated sutures were developed. We assessed the effectiveness of triclosan-coated sutures used for skin closure on the rate of SSIs in colorectal cancer surgery. METHODS: Until August 2012, we used conventional methods for skin closure in colorectal cancer surgery at the Department of Gastroenterological Surgery, Fukuoka University Faculty of Medicine...
November 2016: Journal of Surgical Research
https://www.readbyqxmd.com/read/27915018/design-and-surface-immobilization-of-short-anti-biofilm-peptides
#6
Biswajit Mishra, Tamara Lushnikova, Radha M Golla, Xiuqing Wang, Guangshun Wang
: Short antimicrobial peptides are essential to keep us healthy and their lasting potency can inspire the design of new types of antibiotics. This study reports the design of a family of eight-residue tryptophan-rich peptides (TetraF2W) obtained by converting the four phenylalanines in temporin-SHf to tryptophans. The temporin-SHf template was identified from the antimicrobial peptide database (http://aps.unmc.edu/AP). Remarkably, the double arginine variant (TetraF2W-RR) was more effective in killing methicillin-resistant Staphylococcus aureus (MRSA) USA300, but less cytotoxic to human skin HaCat and kidney HEK293 cells, than the lysine-containing dibasic combinations (KR, RK and KK)...
November 30, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27914268/anti-adhesive-antimicrobial-peptide-coating-prevents-catheter-associated-infection-in-a-mouse-urinary-infection-model
#7
Kai Yu, Joey C Y Lo, Mei Yan, Xiaoqiang Yang, Donald E Brooks, Robert E W Hancock, Dirk Lange, Jayachandran N Kizhakkedathu
Catheter-associated urinary tract infections (CAUTIs) represent one of the most common hospital acquired infections with significant economic consequences and increased patient morbidity. CAUTIs often start with pathogen adhesion and colonization on the catheter surface followed by biofilm formation. Current strategies to prevent CAUTIs are insufficiently effective and antimicrobial coatings based on antimicrobial peptides (AMPs) hold promise in curbing CAUTIs. Here we report an effective surface tethering strategy to prepare AMP coatings on polyurethane (PU), a common biomedical plastic used for catheter manufacture, by using an anti-adhesive hydrophilic polymer coating...
November 24, 2016: Biomaterials
https://www.readbyqxmd.com/read/27910984/enzyme-immobilized-clay-nanotube-chitosan-membranes-with-sustainable-biocatalytic-activities
#8
Jiajia Sun, Raghuvara Yendluri, Kai Liu, Ying Guo, Yuri Lvov, Xuehai Yan
We have developed a simple and effective strategy to prepare an enzymatic membrane by the admixing of a halloysite clay nanotube-lipase complex and a chitosan solution. The loading of 3 wt% lipase into the lumen of halloysite clay nanotubes was enhanced with an electrostatic interaction. 10 wt% of lipase-nanotubes were dispersed in an aqueous chitosan solution and cast as a coating. The enzymatic chitosan-halloysite membranes displayed increased pH, temperature stability and long-term usability for the catalytic decomposition of lipids: 90% of the initial activity was preserved at 80 °C, 70% of the functionality remained at the high pH of 9, and 85% of the activity was sustained after ten continuous cycles of use...
December 2, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27889148/surface-attachment-of-active-antimicrobial-coatings-onto-conventional-plastic-based-laminates-and-performance-assessment-of-these-materials-on-the-storage-life-of-vacuum-packaged-beef-sub-primals
#9
David Clarke, Andrey A Tyuftin, Malco C Cruz-Romero, Declan Bolton, Seamus Fanning, Shashi K Pankaj, Carmen Bueno-Ferrer, Patrick J Cullen, Joe P Kerry
Two antimicrobial coatings, namely Sodium octanoate and Auranta FV (a commercial antimicrobial composed of bioflavonoids, citric, malic, lactic, and caprylic acids) were used. These two antimicrobials were surface coated onto the inner polyethylene layer of cold plasma treated polyamide films using beef gelatin as a carrier and coating polymer. This packaging material was then used to vacuum pack beef sub-primal cuts and stored at 4 °C. A control was prepared using the non-coated commercial laminate and the same vacuum packaged sub-primal beef cuts...
April 2017: Food Microbiology
https://www.readbyqxmd.com/read/27888567/chiral-separation-of-benzothiazole-derivatives-of-amino-acids-using-capillary-zone-electrophoresis
#10
Zuzana Nováková, Vladimír Pejchal, Jan Fischer, Petr Česla
A method for the separation of enantiomers of leucine and phenylalanine benzothiazole derivatives as potential antimicrobial agents was developed using capillary zone electrophoresis with a dual cyclodextrin system. The best resolution of enantiomers was achieved in 100 mmol.L(-1) phosphate background electrolyte pH 3.5 with dual cyclodextrin system consisting of 10 mmol.L(-1) of β-cyclodextrin with 10 mmol.L(-1) of 2-hydroxypropyl-β-cyclodextrin for leucine derivative and 10 mmol.L(-1) of 2-hydroxypropyl-γ-cyclodextrin for phenylalanine derivative, respectively...
November 26, 2016: Journal of Separation Science
https://www.readbyqxmd.com/read/27872553/development-of-a-novel-test-for-simultaneous-bacterial-identification-and-antibiotic-susceptibility
#11
Jonathan Faro, Malika Mitchell, Yuh-Jue Chen, Sarah Kamal, Gerald Riddle, Sebastian Faro
Background. Elucidation of a pathogen's antimicrobial susceptibility requires subculture after the organism is first isolated. This takes several days, requiring patients to be treated with broad-spectrum antibiotics. This approach contributes to the development of bacterial resistance. Methods. Microtiter wells were coated with a polyclonal antibody targeting the pathogen of interest. Bacterial suspensions were added in the presence/absence of selected antibiotics. After washing, captured bacteria were detected...
2016: Infectious Diseases in Obstetrics and Gynecology
https://www.readbyqxmd.com/read/27864671/effects-of-polymer-based-silver-nanoparticle-coated-silicone-splints-on-the-nasal-mucosa-of-rats
#12
Sultan Şevik Eliçora, Duygu Erdem, Aykut Erdem Dinç, Özlem Altunordu Kalaycı, Baki Hazer, Gamze Yurdakan, Canan Külah
Infection is a serious complication after nasal packing that otolaryngologists seek to avoid. The aim of this study is to investigate the use of silver (Ag) nanoparticle, which serves as antimicrobial agents, with nasal tampons. The study design is an experimental animal model and the setting is tertiary referral center. Twenty-four rats were randomized into the following four groups: (1) control group (n = 6); (2) silicone nasal splint (SNS) group (n  =  6); (3) polypropylene-grafted polyethylene glycol (PP-g-PEG) amphiphilic graft copolymer-coated SNS group (n  =  6); and (4) Ag nanoparticle-embedded PP-g-PEG (Ag-PP-g-PEG) amphiphilic graft copolymer-coated SNS group (n  =  6)...
November 18, 2016: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/27856967/nanosized-building-blocks-for-customizing-novel-antibiofilm-approaches
#13
A J Paula, H Koo
Recent advances in nanotechnology provide unparalleled flexibility to control the composition, size, shape, surface chemistry, and functionality of materials. Currently available engineering approaches allow precise synthesis of nanocompounds (e.g., nanoparticles, nanostructures, nanocrystals) with both top-down and bottom-up design principles at the submicron level. In this context, these "nanoelements" (NEs) or "nanosized building blocks" can 1) generate new nanocomposites with antibiofilm properties or 2) be used to coat existing surfaces (e...
November 16, 2016: Journal of Dental Research
https://www.readbyqxmd.com/read/27851985/antimicrobial-effect-of-emulsion-encapsulated-isoeugenol-against-biofilms-of-food-pathogens-and-spoilage-bacteria
#14
Christina Krogsgård Nielsen, Jørgen Kjems, Tina Mygind, Torben Snabe, Karin Schwarz, Yvonne Serfert, Rikke Louise Meyer
Food-related biofilms can cause food-borne illnesses and spoilage, both of which are problems on a global level. Essential oils are compounds derived from plant material that have a potential to be used in natural food preservation in the future since they are natural antimicrobials. Bacterial biofilms are particularly resilient towards biocides, and preservatives that effectively eradicate biofilms are therefore needed. In this study, we test the antibacterial properties of emulsion-encapsulated and unencapsulated isoeugenol against biofilms of Lis...
November 9, 2016: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/27846742/fabrication-and-characterization-of-graphene-based-hybrid-nanocomposite-assessment-of-antibacterial-potential-and-biomedical-application
#15
Mahesh P More, Mahendra D Patil, Abhijeet P Pandey, Pravin O Patil, Prashant K Deshmukh
The present investigation deals with synthesis of graphene oxide (GO) and fabrication of GO-based hybrid nanocomposites (Ncs). Synthesized GO and Ncs were primarily confirmed by UV visible and Fourier transform infrared (FT-IR) spectroscopy. Fabricated Ncs showed potential antimicrobial activity against Gram-positive and Gram-negative bacterial strains. Surface morphology, Elemental analysis, and FTIR imaging analysis were carried out to confirm Ncs formation. The Ncs were impregnated into the pullulan polymeric layer-by-layer (LbL) ultrathin film by using novel spin-coating approach...
November 16, 2016: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/27845276/3d-scaffold-with-effective-multidrug-sequential-release-against-bacteria-biofilm
#16
Rafaela García-Alvarez, Isabel Izquierdo-Barba, María Vallet-Regí
Bone infection is a feared complication following surgery or trauma that remains as an extremely difficult disease to deal with. So far, the outcome of therapy could be improved with the design of 3D implants, which combine the merits of osseous regeneration and local multidrug therapy so as to avoid bacterial growth, drug resistance and the feared side effects. Herein, hierarchical 3D multidrug scaffolds based on nanocomposite bioceramic and polyvinyl alcohol (PVA) prepared by rapid prototyping with an external coating of gelatin-glutaraldehyde (Gel-Glu) have been fabricated...
November 11, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27813824/enhanced-production-of-poly-3-hydroxybutyrate-co-4-hydroxybutyrate-copolymer-and-antimicrobial-yellow-pigmentation-from-cupriavidus-sp-usmahm13-with-anti-biofilm-capability
#17
Iszatty Ismail, Tana Poorani Gurusamy, Hema Ramachandran, Amirul Al-Ashraf Abdullah
Anti-biofilm polymers have the ability to inhibit bacterial biofilm formation, which is known to occur ubiquitously in the environment and pose risks of infection. In this study, production of P(3HB-co-4HB) copolymer and antimicrobial yellow pigment from Cupriavidus sp. USMAHM13 are enhanced via medium optimization. Prior to the improvement of yellow pigment production, screening for the best additional supplement was performed resulting in high-yield yellow pigmentation using yeast extract with optimum concentration of 2 g/L...
November 4, 2016: Preparative Biochemistry & Biotechnology
https://www.readbyqxmd.com/read/27812550/reducing-zno-nanoparticles-toxicity-through-silica-coating
#18
Sing Ling Chia, David Tai Leong
ZnO NPs have good antimicrobial activity that can be utilized as agents to prevent harmful microorganism growth in food. However, the use of ZnO NPs as food additive is limited by the perceived high toxicity of ZnO NPs in many earlier toxicity studies. In this study, surface modification by silica coating was used to reduce the toxicity of ZnO NPs by significantly reducing the dissolution of the core ZnO NPs. To more accurately recapitulate the scenario of ingested ZnO NPs, we tested our as synthesized ZnO NPs in ingestion fluids (synthetic saliva and synthetic gastric juice) to determine the possible forms of ZnO NPs in digestive system before exposing the products to colorectal cell lines...
October 2016: Heliyon
https://www.readbyqxmd.com/read/27812015/understanding-the-antifungal-mechanism-of-ag-zno-core-shell-nanocomposites-against-candida-krusei
#19
Bhaskar Das, Md Imran Khan, R Jayabalan, Susanta K Behera, Soon-Il Yun, Suraj K Tripathy, Amrita Mishra
In the present paper, facile synthesis of Ag@ZnO core-shell nanocomposites is reported where zinc oxide is coated on biogenic silver nanoparticles synthesized using Andrographis paniculata and Aloe vera leaf extract. Structural features of as synthesized nanocomposites are characterized by UV-visible spectroscopy, XRD, and FTIR. Morphology of the above core-shell nanocomposites is investigated by electron microscopy. As synthesized nanocomposite material has shown antimicrobial activity against Candida krusei, which is an opportunistic pathogen known to cause candidemia...
November 4, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27810541/chitosan-zinc-oxide-nanocomposite-coatings-for-the-prevention-of-marine-biofouling
#20
Laila Al-Naamani, Sergey Dobretsov, Joydeep Dutta, J Grant Burgess
Marine biofouling is a worldwide problem affecting maritime industries. Global concerns about the high toxicity of antifouling paints have highlighted the need to develop less toxic antifouling coatings. Chitosan is a natural polymer with antimicrobial, antifungal and antialgal properties that is obtained from partial deacetylation of crustacean waste. In the present study, nanocomposite chitosan-zinc oxide (chitosan-ZnO) nanoparticle hybrid coatings were developed and their antifouling activity was tested...
October 28, 2016: Chemosphere
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