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https://www.readbyqxmd.com/read/28821050/clean-approach-to-synthesis-of-graphene-like-cufe2o4-polysaccharide-resin-nanohybrid-bifunctional-compound-for-dye-adsorption-and-bacterial-capturing
#1
Mostafa Hossein Beyki, Sarina Ehteshamzadeh Ganjbakhsh, Sara Minaeian, Farzaneh Shemirani
Focus of this research is on employment of a green route to prepare magnetic CuFe2O4@polysaccharide resin for environmental remediation purpose. The method is including solvent free solid state synthesis of copper ferrite nanoparticles by combustion route using cellulose as fuel. Then polysaccharide resin as well as its magnetic composite was prepared by using glucose, citric acid and copper ferrite as solid raw materials. Characterization study using FESEM and TEM images showed that as synthesized resin possesses graphene like structure as ferrite nanoparticles are dispersed in the matrice of resin...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28772965/rapid-and-sensitive-detection-of-bacteria-response-to-antibiotics-using-nanoporous-membrane-and-graphene-quantum-dot-gqds-based-electrochemical-biosensors
#2
Weiwei Ye, Jiubiao Guo, Xianfeng Bao, Tian Chen, Wenchuan Weng, Sheng Chen, Mo Yang
The wide abuse of antibiotics has accelerated bacterial multiresistance, which means there is a need to develop tools for rapid detection and characterization of bacterial response to antibiotics in the management of infections. In the study, an electrochemical biosensor based on nanoporous alumina membrane and graphene quantum dots (GQDs) was developed for bacterial response to antibiotics detection. Anti-Salmonella antibody was conjugated with amino-modified GQDs by glutaraldehyde and immobilized on silanized nanoporous alumina membranes for Salmonella bacteria capture...
May 31, 2017: Materials
https://www.readbyqxmd.com/read/28772597/antimicrobial-bamboo-materials-functionalized-with-zno-and-graphene-oxide-nanocomposites
#3
Junyi Zhang, Bo Zhang, Xiufang Chen, Bingbing Mi, Penglian Wei, Benhua Fei, Xindong Mu
Bamboo materials with improved antibacterial performance based on ZnO and graphene oxide (GO) were fabricated by vacuum impregnation and hydrothermal strategies. The Zn2+ ions and GO nanosheets were firstly infiltrated into the bamboo structure, followed by dehydration and crystallization upon hydrothermal treatment, leading to the formation of ZnO/GO nanocomposites anchored in the bulk bamboo. The bamboo composites were characterized by several techniques including scanning electron microscopy (SEM), Fourier transform infrared spectra (FTIR), and X-ray diffraction (XRD), which confirmed the existence of GO and ZnO in the composites...
February 27, 2017: Materials
https://www.readbyqxmd.com/read/28767226/mussel-inspired-architecture-of-high-flux-loose-nanofiltration-membrane-functionalized-with-antibacterial-reduced-graphene-oxide-copper-nanocomposites
#4
Junyong Zhu, Jing Wang, Adam Andrew Uliana, Miaomiao Tian, Yiming Zhang, Yatao Zhang, Alexander Volodin, Kenneth Simoens, Shushan Yuan, Jian Li, Jiuyang Lin, Kristel Bernaerts, Bart Van der Bruggen
Graphene-based nanocomposites have a vast potential for wide-ranging antibacterial applications due to the inherently strong biocidal activity and versatile compatibility of such nanocomposites. Therefore, graphene-based functional nanomaterials can introduce enhanced antibiofouling and antimicrobial properties to polymeric membrane surfaces. In this study, reduced graphene oxide-copper (rGOC) nanocomposites were synthesized as newly robust biocides via in situ reduction. Inspired by the emerging method of bridging ultrafiltration membrane surface cavities, loose nanofiltration (NF) membranes were designed using a rapid (2 h) bioinspired strategy in which rGOC nanocomposites were firmly codeposited with polydopamine (PDA) onto an ultrafiltration support...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28764786/evaluation-of-the-antibacterial-power-and-biocompatibility-of-zinc-oxide-nanorods-decorated-graphene-nanoplatelets-new-perspectives-for-antibiodeteriorative-approaches
#5
Elena Zanni, Erika Bruni, Chandrakanth Reddy Chandraiahgari, Giovanni De Bellis, Maria Grazia Santangelo, Maurizio Leone, Agnese Bregnocchi, Patrizia Mancini, Maria Sabrina Sarto, Daniela Uccelletti
BACKGROUND: Nanotechnologies are currently revolutionizing the world around us, improving the quality of our lives thanks to a multitude of applications in several areas including the environmental preservation, with the biodeterioration phenomenon representing one of the major concerns. RESULTS: In this study, an innovative nanomaterial consisting of graphene nanoplatelets decorated by zinc oxide nanorods (ZNGs) was tested for the ability to inhibit two different pathogens belonging to bacterial genera frequently associated with nosocomial infections as well as biodeterioration phenomenon: the Gram-positive Staphylococcus aureus and the Gram-negative Pseudomonas aeruginosa...
August 1, 2017: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/28728009/bridged-rebar-graphene-functionalized-aptasensor-for-pathogenic-e-coli-o78-k80-h11-detection
#6
Harmanjit Kaur, Munish Shorie, Manju Sharma, Ashok K Ganguli, Priyanka Sabherwal
We report a novel fabrication method of functionalised Bridged Rebar Graphene (BRG) onto newly designed nanostructured aptasensor for label free impedimetric sensing of pathogenic bacteria E. coli O78:K80:H11. The chemical facilitated unscrolling of MWCNT and subsequent bridging with terephthalaldehyde (TPA) to form 3D-hierarchical BRG nanoconstruct exhibited synergistic effect by combining enhanced electrical properties and facile chemical functionality for stable bio-interface. The bacteria-DNA interactions were captured on BRG nanostructured electrode by using specific anti-E...
July 5, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28715631/synergistic-bacteria-killing-through-photodynamic-and-physical-actions-of-graphene-oxide-ag-collagen-coating
#7
Xianzhou Xie, Congyang Mao, Xiangmei Liu, Yanzhe Zhang, Zhenduo Cui, Xianjin Yang, Kelvin W K Yeung, Haobo Pan, Paul K Chu, Shuilin Wu
Researchers have widely agreed that the broad spectrum antibacterial activity of silver nanoparticles (AgNPs) can be predominantly ascribed to the action of Ag(+). This study marks the first report detailing the rapid and highly efficient synergistic bacteria killing of AgNPs, which is achieved by inspiring AgNPs' strong photocatalytic capability to rapidly produce radical oxygen species using 660 nm visible light together with the innate antimicrobial ability of Ag(+). These AgNPs were uniformly distributed into well-defined graphene oxide (GO) nanosheets through an in situ reduction of Ag(+) and subsequently wrapped with a thin layer of type I collagen...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28712344/interaction-of-graphene-oxide-nano-sheets-and-landfill-leachate-bacterial-culture
#8
Nafise Jamialahmadi, Edwin Safari, Majid Baghdadi
Interaction of graphene oxide (GO) and municipal landfill leachate bacterial culture was investigated. In aerobic conditions, stepwise addition of GO concentration to 60 mg/L increased the oxygen uptake rate coefficient. However, increasing GO concentration to 100 mg/L slightly decreased the oxygen uptake rate coefficient. When anoxic conditions developed, GO suspensions decreased the total bacterial activity and the substrate consumption. The Raman spectroscopy confirmed the chemical reduction of GO during exposure to bacteria; nonetheless, the extent of reduction in anoxic conditions was more than that in aerobic conditions...
July 17, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28704738/high-efficiency-microbial-electrosynthesis-of-acetate-from-carbon-dioxide-by-a-self-assembled-electroactive-biofilm
#9
Tian-Shun Song, Hongkun Zhang, Haixia Liu, Dalu Zhang, Haoqi Wang, Yang Yang, Hao Yuan, Jingjing Xie
Microbial electrosynthesis (MES) is a biocathode-driven process, producing high-value chemicals from CO2. Here, an in situ self-assembled graphene oxide (rGO)/biofilm was constructed, in MES, for high efficient acetate production. GO has been successfully reduced by electroautotrophic bacteria for the first time. An increase, of 1.5 times, in the volumetric acetate production rate, was obtained by self-assembling rGO/biofilm, as compared to the control group. In MES with rGO/biofilm, a volumetric acetate production rate of 0...
July 3, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28685628/bacteriomimetic-poly-%C3%AE-glutamic-acid-surface-coating-for-hemocompatibility-and-safety-of-nanomaterials
#10
Gayong Shim, Dongyoon Kim, Jinyoung Kim, Min Sung Suh, Youn Kyu Kim, Yu-Kyoung Oh
Poly-γ-glutamic acid (PGA), a major component of the bacterial capsule, is known to confer hydrophilicity to bacterial surfaces and protect bacteria from interactions with blood cells. We tested whether applying a bacteriomimetic surface coating of PGA modulates interactions of nanomaterials with blood cells or affects their safety and photothermal antitumor efficacy. Amphiphilic PGA (APGA), prepared by grafting phenylalanine residues to PGA, was used to anchor PGA to reduced graphene oxide (rGO) nanosheets, a model of hydrophobic nanomaterials...
July 7, 2017: Nanotoxicology
https://www.readbyqxmd.com/read/28677651/effect-of-precursor-on-antifouling-efficacy-of-vertically-oriented-graphene-nanosheets
#11
Karthika Prasad, Chaturanga D Bandara, Shailesh Kumar, Gurinder Pal Singh, Bastian Brockhoff, Kateryna Bazaka, Kostya Ken Ostrikov
Antifouling efficacy of graphene nanowalls, i.e., substrate-bound vertically-oriented graphene nanosheets, has been demonstrated against biofilm-forming Gram-positive and Gram-negative bacteria. Where graphene nanowalls are typically prepared using costly high-temperature synthesis from high-purity carbon precursors, large-scale applications demand efficient, low-cost processes. The advancement of plasma enabled synthesis techniques in the production of nanomaterials has opened a novel and effective method for converting low-cost natural waste resources to produce nanomaterials with a wide range of applications...
July 4, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28652728/ti-go-ag-nanocomposite-the-effect-of-content-level-on-the-antimicrobial-activity-and-cytotoxicity
#12
Jianfeng Jin, Li Zhang, Mengqi Shi, Yumei Zhang, Qintao Wang
Surface modification of titanium (Ti) implants are extensively studied in order to obtain prominent biocompatibility and antimicrobial activity, especially preventing implant-associated infection. In this study, Ti substrates surface were modified by graphene oxide (GO) thin film and silver (Ag) nanoparticles via electroplating and ultraviolet reduction methods so as to achieve this purpose. Microstructures, distribution, quantities and spectral peaks of GO and Ag loading on the Ti sheets surface were characterized...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28631614/3d-printed-bioceramic-scaffolds-with-antibacterial-and-osteogenic-activity
#13
Yongliang Zhang, Dong Zhai, Mengchi Xu, Qingqiang Yao, Huiying Zhu, Jiang Chang, Chengtie Wu
Bacterial infection poses a significant risk with the wide application of bone graft materials. Designing bone grafts with good antibacterial performance and excellent bone-forming activity is of particular significance for bone tissue engineering. In our study, a 3D printing method was used to prepare β-tricalcium phosphate (β-TCP) bioceramic scaffolds. Silver (Ag) nanoparticles were uniformly dispersed on graphene oxide (GO) to form a homogeneous nanocomposite (named Ag@GO) with different Ag-to-graphene oxide mass ratios, with this being synthesized via the liquid chemical reduction approach...
June 20, 2017: Biofabrication
https://www.readbyqxmd.com/read/28624620/agbr-nanoparticles-3d-nitrogen-doped-graphene-hydrogel-for-fabricating-all-solid-state-luminol-electrochemiluminescence-escherichia-coli-aptasensors
#14
Nan Hao, Xuan Zhang, Zhou Zhou, Rong Hua, Ying Zhang, Qian Liu, Jing Qian, Henan Li, Kun Wang
It is necessary to develop rapid, simple and accurate detection method for Escherichia coli (E. coli) due to its widely distributed pathogenic bacteria. Herein, we prepared AgBr nanoparticles (NPs) anchored 3D nitrogen-doped graphene hydrogel (3DNGH) nanocomposites with an exceptionally large accessible surface by a simple hydrothermal approach. The as-prepared 3DNGH porous nanocomposite not only showed better conductivity than that of 3D graphene due to introducing nitrogen element into graphene framework, but also provided a high loading volume for immobilizing luminol...
June 13, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28582974/breathable-vapor-toxicant-barriers-based-on-multilayer-graphene-oxide
#15
Ruben Spitz Steinberg, Michelle Cruz, Naser G A Mahfouz, Yang Qiu, Robert H Hurt
There is tremendous interest in graphene-based membranes as protective molecular barriers or molecular sieves for separation technologies. Graphene oxide (GO) films in the dry state are known to be effective barriers for molecular transport and to expand in the presence of moisture to create enlarged intersheet gallery spaces that allow rapid water permeation. Here we explore an application for GO membranes as water-breathable barrier layers for personal protective equipment, which are designed to allow outward perspiration while protecting the wearer from chemical toxicants or biochemical agents in the local environment...
June 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28575993/graphene-oxide-nanoribbons-as-nanomaterial-for-bone-regeneration-effects-on-cytotoxicity-gene-expression-and-bactericidal-effect
#16
R Ricci, N C S Leite, N S da-Silva, C Pacheco-Soares, R A Canevari, F R Marciano, T J Webster, A O Lobo
Graphene oxide nanoribbons (O-GNR) surges as an interesting nanomaterial for biomedical applications due to feasibility to incorporate functional groups and possible bactericidal properties. Herein, high concentrations of O-GNR were biologically evaluated using human osteoblast cells and gram positive and negative bacteria. Briefly, our goal were to evaluate: (1) synthetic pathway, (2) characterization and (3) effects of O-GNR composition and structural factors as a new approach for biomedical applications...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28570887/bacterial-community-shift-and-incurred-performance-in-response-to-in-situ-microbial-self-assembly-graphene-and-polarity-reversion-in-microbial-fuel-cell
#17
Junfeng Chen, Lihua Zhang, Yongyou Hu, Wantang Huang, Zhuyu Niu, Jian Sun
In this work, bacterial community shift and incurred performance of graphene modified bioelectrode (GM-BE) in microbial fuel cell (MFC) were illustrated by high throughput sequencing technology and electrochemical analysis. The results showed that Firmicutes occupied 48.75% in graphene modified bioanode (GM-BA), while Proteobacteria occupied 62.99% in graphene modified biocathode (GM-BC), both were dominant bacteria in phylum level respectively. Typical exoelectrogens, including Geobacter, Clostridium, Pseudomonas, Geothrix and Hydrogenophaga, were counted 26...
October 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28554055/graphene-oxide-as-an-efficient-antimicrobial-nanomaterial-for-eradicating-multi-drug-resistant-bacteria-in-vitro-and-in-vivo
#18
Xu Wu, Shirui Tan, Yuqian Xing, Qinqin Pu, Min Wu, Julia Xiaojun Zhao
Graphene is a novel two-dimensional nanomaterial with a growing number of practical applications across numerous fields. In this work, we explored potential biomedical applications of graphene oxide (GO) by systematically studying antibacterial capacity of GO in both macrophages and animal models. Three types of bacteria, including Klebsiella pneumoniae (Kp), Escherichia coli (E. coli) and P. aeruginosa (Pa) were used for in vitro study. Kp was also selected as a representative multidrug resistant (MDR) bacterium for in vivo study...
September 1, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28549325/graphene-oxide-in-the-water-environment-could-affect-tetracycline-antibiotic-resistance
#19
Mei-Ting Guo, Guo-Sheng Zhang
In recent years, the influence of new materials like nanoparticles in the water environment on biological substances has been widely studied. Antibiotic resistance genes (ARGs) represent a new type of pollutant in the environment. Graphene oxide (GO), as a nano material, because of its unique structure, may have an impact on antibiotic resistance bacteria (ARB) and ARGs; however the research in this area is rarely reported. Therefore, this study mainly investigated the effects of GO on bacterial antibiotic resistance...
May 3, 2017: Chemosphere
https://www.readbyqxmd.com/read/28534395/hyaluronic-acid-templated-ag-nanoparticles-graphene-oxide-composites-for-synergistic-therapy-of-bacteria-infection
#20
Xiang Ran, Ye Du, Zhenzhen Wang, Huan Wang, Fang Pu, Jinsong Ren, Xiaogang Qu
Developing methods of decreasing the harm to cell and increasing the antibacterial efficiency is becoming a potential topic of medical treatments. We demonstrated a hyaluronidase-triggered photothermal platform for killing bacteria based on silver nanoparticles (AgNPs) and graphene oxide (GO). The property of the hyaluronidase (HAase)-triggered release provided excellent antibacterial activity against Staphylococcus aureus. Upon illumination of NIR light, the GO-based nanomaterials locally raised the temperature, resulting in high mortality of bacteria...
June 5, 2017: ACS Applied Materials & Interfaces
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