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https://www.readbyqxmd.com/read/28914466/supramolecular-hydro-and-ionogels-a-study-of-their-properties-and-antibacterial-activity
#1
Carla Rizzo, Rossella Arrigo, Nadka Tz Dintcheva, Giuseppe Gallo, Francesco Giannici, Renato Noto, Alberto Sutera, Paola Vitale, Francesca D'Anna
Diimidazolium-based organic salts, bearing peptides or aminoacids as anions, have been synthesized and tested for their gelling ability in biocompatible solvents. These low molecular weight salts were successfully used as gelators in phosphate saline buffer and ionic liquids. Then, properties of obtained soft materials were analyzed in terms of melting temperature and gel strength as accounted for by rheological investigation. Gel phase formation was studied using UV-vis and resonance light scattering measurements, whereas morphology of soft materials was analysed using polarized optical microscopy and scanning electron microscopy...
September 15, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28914053/construction-of-functional-coating-with-durable-and-broad-spectrum-antibacterial-potential-based-on-mussel-inspired-dendritic-polyglycerol-and-in-situ-formed-copper-nanoparticles
#2
Mingjun Li, Lingyan Gao, Christoph Schlaich, Jianguang Zhang, Ievgen S Donskyi, Guozhi Yu, Wenzhong Li, Zhaoxu Tu, Jens Rolff, Tanja Schwerdtle, Rainer Haag, Nan Ma
A novel surface coating with durable broad-spectrum antibacterial ability was prepared based on mussel-inspired dendritic polyglycerol (MI-dPG) embedded with copper nanoparticles (Cu NPs). The functional surface coating is fabricated via a facile dip-coating process followed by in-situ reduction of copper ions with a MI-dPG coating to introduce Cu NPs into the coating matrix. This coating has been demonstrated efficient long term antibacterial properties against Escherichia coli (E. coli), Staphylococcus aureus (S...
September 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28891686/innovative-processes-and-technologies-for-modified-atmosphere-packaging-of-fresh-and-fresh-cut-fruits-and-vegetables-a-review
#3
Matthew Deas Wilson, Roger A Stanley, Alieta Eyles, Tom Ross
Modified atmosphere packaging (MAP) technology has been commercially viable since the 1970s. Currently, MAP is extensively used worldwide to preserve the quality and extend the shelf-life of whole fresh fruits and vegetables, but is also increasingly used to extend the shelf-life of minimally processed fresh fruit and vegetables. This review discusses new processes and technologies that can be used to improve quality preservation and consumer acceptability of minimally processed produce where high respiration rates and challenging degradation processes operate...
September 11, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28889001/decontamination-of-fresh-cut-cucumber-slices-by-a-combination-of-a-modified-chitosan-coating-containing-carvacrol-nanoemulsions-and-pulsed-light
#4
Özge Taştan, Gianpiero Pataro, Francesco Donsì, Giovanna Ferrari, Taner Baysal
In this study, the impact of the combination of pulsed light (PL) treatments with antimicrobial coatings, consisting of modified chitosan suspensions incorporating carvacrol nanoemulsions, was investigated on the decontamination of fresh-cut cucumber slices. The upper surface of the cucumber slices, with or without the coating deposition, was inoculated with Escherichia coli ATCC 26 to reach a final concentration of 10(7)CFU/g of the vegetable. PL treatments were conducted at different fluence (4, 8, and 12J/cm(2)) on the inoculated surface of cucumber slices...
August 16, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28887986/biomineralized-diamond-like-carbon-films-with-incorporated-titanium-dioxide-nanoparticles-improved-bioactivity-properties-and-reduced-biofilm-formation
#5
F S Lopes, J R Oliveira, J Milani, L D Oliveira, J P B Machado, V J Trava-Airoldi, A O Lobo, F R Marciano
Recently, the development of coatings to protect biomedical alloys from oxidation, passivation and to reduce the ability for a bacterial biofilm to form after implantation has emerged. Diamond-like carbon films are commonly used for implanted medical due to their physical and chemical characteristics, showing good interactions with the biological environment. However, these properties can be significantly improved when titanium dioxide nanoparticles are included, especially to enhance the bactericidal properties of the films...
December 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28883814/virucidal-influence-of-ionic-liquids-on-phages-p100-and-ms2
#6
Susanne Fister, Patrick Mester, Julia Sommer, Anna K Witte, Roland Kalb, Martin Wagner, Peter Rossmanith
An increasing number of publications describe the potential of ionic liquids (ILs) as novel antimicrobials, antibacterial coatings and even as active pharmaceutical ingredients. Nevertheless, a major research area, notably their impact on viruses, has so far been neglected. Consequently the aim of this study was to examine the effects of ILs on the infectivity of viruses. A systematic analysis to investigate the effects of defined structural elements of ILs on virus activity was performed using 55 ILs. All structure activity relationships (SARs) were tested on the human norovirus surrogate phage MS2 and phage P100 representing non-enveloped DNA viruses...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28881387/effects-of-lactoferrin-and-lactoperoxidase-containing-food-on-the-oral-microbiota-in-the-elderly
#7
Manabu Nakano, Hiroyuki Wakabayashi, Hirosuke Sugahara, Toshitaka Odamaki, Koji Yamauchi, Fumiaki Abe, Jin-Zhong Xiao, Kohji Murakami, Kentaro Ishikawa, Shouji Hironaka
The oral microbiota influences health and disease states. Some Gram-negative anaerobic bacteria play an important role in tissue destruction associated with periodontal disease. Lactoferrin (LF) and lactoperoxidase (LPO) are antimicrobial proteins found in saliva; however, their influence on the whole oral microbiota currently remains unknown. We herein assessed the effects of the long-term ingestion of LF- and LPO-containing tablets on the microbiota of supragingival plaque and tongue coating in a randomized, double-blinded, placebo-controlled study...
September 7, 2017: Microbiology and Immunology
https://www.readbyqxmd.com/read/28866198/bacterial-biofilm-elimination-using-gold-nanorod-localised-surface-plasmon-resonance-generated-heat
#8
Maria Pihl, Ellen Bruzell, Martin Andersson
Antimicrobial resistance is an increasing global health concern and the world is facing a major challenge to develop novel ways of replacing antibiotics. Gold nanorods exhibit localised surface plasmon resonance upon optical irradiation. During relaxation, absorbed energy is dissipated as heat, which has been utilized to kill bacteria. In this study, 10×45nm gold nanorods were attached to glass surfaces using silanisation. Then biofilms were cultured on the surfaces and studied using microscopy. On average, 71% of the early biofilm bacteria were eliminated after 5min of near infrared radiation (LED emission peak at 850nm) of the gold nanorod coated surfaces, showing the potential of this novel antibiofilm technique...
November 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28863896/evaluation-of-antibacterial-properties-on-polysulfone-composite-membranes-using-synthesized-biogenic-silver-nanoparticles-with-ulva-compressa-l-k%C3%A3-tz-and-cladophora-glomerata-l-k%C3%A3-tz-extracts
#9
Fozia T Minhas, Gulsin Arslan, I Hilal Gubbuk, Cengiz Akkoz, Betul Yılmaz Ozturk, Baran Asıkkutlu, Ugur Arslan, Mustafa Ersoz
Polysulfone (PS) composite membrane using green synthesized biogenic silver nanoparticles (Ag-NPs) with Ulva compressa (L.) Kütz. and Cladophora glomerata (L.) Kütz. extract were prepared by spin coating technique and are tested for antimicrobial activity using a direct contact test for the first time. Initially green synthesis of Ag-NPs was accomplished utilizing green macro algae i.e. U. compressa (L.) Kütz. and C. glomerata (L.) Kütz. by the reduction of AgNO3. The Ag-NPs/PS composite membranes from both algae revealed outstanding antimicrobial activity against all bacteria i...
August 29, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28858240/toxicity-effects-of-functionalized-quantum-dots-gold-and-polystyrene-nanoparticles-on-target-aquatic-biological-models-a-review
#10
REVIEW
Giovanni Libralato, Emilia Galdiero, Annarita Falanga, Rosa Carotenuto, Elisabetta de Alteriis, Marco Guida
Nano-based products are widespread in several sectors, including textiles, medical-products, cosmetics, paints and plastics. Nanosafety and safe-by-design are driving nanoparticle (NP) production and applications through NP functionalization (@NPs). Indeed, @NPs frequently present biological effects that differ from the parent material. This paper reviews the impact of quantum dots (QDs), gold nanoparticles (AuNPs), and polystyrene-cored NPs (PSNPs), evidencing the role of NP functionalization in toxicity definition...
August 31, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28842032/rapid-in-vivo-determination-of-fluoroquinolones-in-cultured-puffer-fish-takifugu-obscurus-muscle-by-solid-phase-microextraction-coupled-with-liquid-chromatography-tandem-mass-spectrometry
#11
Yijia Tang, Jianqiao Xu, Le Chen, Junlang Qiu, Yuan Liu, Gangfeng Ouyang
Fluoroquinolones (FQs) are a group of antimicrobial agents that have been widely used for therapeutic purposes in clinical medicine for human and veterinary diseases, as well as in aquaculture production. Their residues, however, may survive in foods of animal origin, thus causing health risks for human. In this study, a rapid and sensitive method based on in vivo solid-phase microextraction (SPME) coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS) was developed to detect the residues of five FQs in cultured puffer fish (Takifugu obscurus)...
December 1, 2017: Talanta
https://www.readbyqxmd.com/read/28825641/two-in-one-biointerfaces-antimicrobial-and-bioactive-nanoporous-gallium-titanate-layers-for-titanium-implants
#12
Seiji Yamaguchi, Shekhar Nath, Yoko Sugawara, Kamini Divakarla, Theerthankar Das, Jim Manos, Wojciech Chrzanowski, Tomiharu Matsushita, Tadashi Kokubo
The inhibitory effect of gallium (Ga) ions on bone resorption and their superior microbial activity are attractive and sought-after features for the vast majority of implantable devices, in particular for implants used for hard tissue. In our work, for the first time, Ga ions were successfully incorporated into the surface of titanium metal (Ti) by simple and cost-effective chemical and heat treatments. Ti samples were initially treated in NaOH solution to produce a nanostructured sodium hydrogen titanate layer approximately 1 μm thick...
August 20, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28822873/surface-modification-of-an-intraocular-lens-material-by-plasma-assisted-grafting-with-2-hydroxyethyl-methacrylate-hema-for-controlled-release-of-moxifloxacin
#13
A Paula Vieira, Andreia F R Pimenta, Diana Silva, M Helena Gil, Patrícia Alves, Patrícia Coimbra, José L G C Mata, Dimitriya Bozukova, Tiago R Correia, Ilídio J Correia, A Paula Serro, A Jorge Guiomar
Endophthalmitis, an inflammation of the eye due to perioperative infection, may occur after cataract surgery. Intraocular lenses (IOLs) loaded with an antibiotic have been proposed as an alternative to the conventional postoperative endophthalmitis prophylaxis, since the antibiotic is delivered directly to the target site. In this work, an IOL-based antibiotic releasing system was prepared from a copolymer used in the production of IOLs and a fluoroquinolone used in endophthalmitis prophylaxis (moxifloxacin, MFX)...
August 16, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28821158/synthesis-characterization-bioactivity-and-potential-application-of-phenolic-acid-grafted-chitosan-a-review
#14
REVIEW
Jun Liu, Huimin Pu, Shuang Liu, Juan Kan, Changhai Jin
In recent years, increasing attention has been paid to the grafting of phenolic acid onto chitosan in order to enhance the bioactivity and widen the application of chitosan. Here, we present a comprehensive overview on the recent advances of phenolic acid grafted chitosan (phenolic acid-g-chitosan) in many aspects, including the synthetic method, structural characterization, biological activity, physicochemical property and potential application. In general, four kinds of techniques including carbodiimide based coupling, enzyme catalyzed grafting, free radical mediated grafting and electrochemical methods are frequently used for the synthesis of phenolic acid-g-chitosan...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821116/active-release-coating-of-multilayer-assembled-branched-and-ionic-%C3%AE-cyclodextrins-onto-poly-ethylene-terephthalate
#15
Leyre Pérez-Álvarez, Leire Ruiz-Rubio, Erlantz Lizundia, Estíbaliz Hernáez, Luis M León, Jose Luis Vilas-Vilela
Branched ionic cyclodextrins multilayers were assembled onto the surface of previously aminolyzed poly(ethylene terephthalate) in order to construct local drug delivery tailored platforms with potential applicability as materials for indwelling medical devices. The construction of the multilayers took place by the alternate deposition of ionic cyclodextrin derivatives and was characterized by surface zeta-potential measurements, X-ray photoelectron spectroscopy and, after fluorescent labeling of anionic branched cyclodextrins, by UV-vis spectroscopy and confocal fluorescence spectroscopy...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28818729/characterization-of-citrus-pectin-films-integrated-with-clove-bud-essential-oil-physical-thermal-barrier-antioxidant-and-antibacterial-properties
#16
Tanzeela Nisar, Zi-Chao Wang, Xi Yang, You Tian, Muneeb Iqbal, Yurong Guo
The increasing demand for bio-based materials to be used in food packaging has stimulated the development of novel, environmentally-friendly edible films. Antimicrobial films were developed by incorporating different levels of clove bud essential oil (0.5%, 1.0%, and 1.5%) into the citrus pectin in order to modify the functional properties of the films. Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry analysis (DSC) and X-ray diffraction (XRD) were performed, together with the determination of physical, optical, mechanical, antioxidant and antimicrobial properties of pectin emulsified films...
August 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28813014/antibacterial-properties-of-nonwoven-wound-dressings-coated-with-manuka-honey-or-methylglyoxal
#17
Sophie E L Bulman, Giuseppe Tronci, Parikshit Goswami, Chris Carr, Stephen J Russell
Manuka honey (MH) is used as an antibacterial agent in bioactive wound dressings via direct impregnation onto a suitable substrate. MH provides unique antibacterial activity when compared with conventional honeys, owing partly to one of its constituents, methylglyoxal (MGO). Aiming to investigate an antibiotic-free antimicrobial strategy, we studied the antibacterial activity of both MH and MGO (at equivalent MGO concentrations) when applied as a physical coating to a nonwoven fabric wound dressing. When physically coated on to a cellulosic hydroentangled nonwoven fabric, it was found that concentrations of 0...
August 16, 2017: Materials
https://www.readbyqxmd.com/read/28807880/-broad-spectrum-bactericidal-activity-of-a-new-bioactive-grafting-material-f18-against-clinically-important-bacterial-strains
#18
M T Souza, L A Campanini, C R Chinaglia, O Peitl, E D Zanotto, C W O Souza
Infection is the most relevant surgical complication in implant or grafting procedures. Osteomyelitis and other chronic conditions pose a constant challenge in the current practice of medicine. In this context, a grafting biomaterial that possesses antibacterial properties combined with bioactivity could have great clinical impact. Researchers at the Vitreous Materials Laboratory (LaMaV-UFSCar) recently developed a glass composition, F18, which presents an improved workability range combined with high bioactivity...
August 11, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28805046/electroenhanced-antimicrobial-coating-based-on-conjugated-polymers-with-covalently-coupled-silver-nanoparticles-prevents-staphylococcus-aureus-biofilm-formation
#19
Salvador Gomez-Carretero, Rolf Nybom, Agneta Richter-Dahlfors
The incidence of hospital-acquired infections is to a large extent due to device-associated infections. Bacterial attachment and biofilm formation on surfaces of medical devices often act as seeding points of infection. To prevent such infections, coatings based on silver nanoparticles (AgNPs) are often applied, however with varying clinical success. Here, the traditional AgNP-based antibacterial technology is reimagined, now forming the base for an electroenhanced antimicrobial coating. To integrate AgNPs in an electrically conducting polymer layer, a simple, yet effective chemical strategy based on poly(hydroxymethyl 3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT-MeOH:PSS) and (3-aminopropyl)triethoxysilane is designed...
August 14, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28804527/synthesis-and-characterisation-of-cross-linked-chitosan-composites-functionalised-with-silver-and-gold-nanoparticles-for-antimicrobial-applications
#20
Catherine Ryan, Emma Alcock, Finbarr Buttimer, Michael Schmidt, David Clarke, Martyn Pemble, Maria Bardosova
We present a study of a range of cross-linked chitosan composites with potential antimicrobial applications. They were formed by cross-linking chitosan and siloxane networks and by introducing silver and gold nanoparticles (NPs). The aim was to investigate whether adding the metal NPs to the chitosan-siloxane composite would lead to a material with enhanced antimicrobial ability as compared to chitosan itself. The composites were synthesised in hydrogel form with the metal NPs embedded in the cross-linked chitosan network...
2017: Science and Technology of Advanced Materials
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