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https://www.readbyqxmd.com/read/29051936/nio-nanoflakes-grafted-graphene-an-excellent-photocatalyst-and-a-novel-nanomaterial-for-achieving-complete-pathogen-control
#1
A Arshad, J Iqbal, Q Mansoor
The increased levels of industrial pollutants in water and of drug-resistant pathogens more generally are a serious threat to human and aquatic life. Herein, we present the solar-light-induced dye removal and bactericidal properties of nickel oxide (NiO) and graphene nanoplatelet (GNP) nanocomposites. The conducting nature of GNPs is the key factor that accounts for the enhanced photocatalytic and antibacterial activity. Remarkably, the graphene/NiO nanocomposite shows outstanding photocatalytic activity (99% degradation) as compared to NiO (34%) alone, which makes it a potential candidate for the depollution of dye-contaminated water...
October 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/29040914/efficient-capture-rapid-killing-and-ultrasensitive-detection-of-bacteria-by-a-nano-decorated-multi-functional-electrode-sensor
#2
Runrun Wu, Yue Ma, Jianming Pan, Shih-Hui Lee, Jinxin Liu, Hengjia Zhu, Runxin Gu, Kenneth J Shea, Guoqing Pan
In this work, we demonstrated a nano-decorated porous impedance electrode sensor for efficient capture, rapid killing and ultrasensitive detection of bacteria. The multi-functional sensor was prepared by a facile sonochemical method via in situ deposition of antibacterial prickly Zn-CuO nanoparticles and graphene oxide (GO) nanosheets on a Ni porous electrode. Due to the surface burr-like nanostructures, the nano-decorated impedance sensor exhibited very good bacterial-capture efficiency (70 - 80% in 20min) even at a low concentration of 50 CFU mL(-1), rapid antibacterial rate (100% killing in 30min) and high detection sensitivity (as low as 10 CFU mL(-1))...
October 7, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29030671/graphene-based-label-free-electrochemical-aptasensor-for-rapid-and-sensitive-detection-of-foodborne-pathogen
#3
Shalini Muniandy, Ignatius Julian Dinshaw, Swe Jyan Teh, Chin Wei Lai, Fatimah Ibrahim, Kwai Lin Thong, Bey Fen Leo
Reduced graphene oxide (rGO) has emerged as a promising nanomaterial for reliable detection of pathogenic bacteria due to its exceptional properties such as ultrahigh electron transfer ability, large surface to volume ratio, biocompatibility, and its unique interactions with DNA bases of the aptamer. In this study, rGO-azophloxine (AP) nanocomposite aptasensor was developed for a sensitive, rapid, and robust detection of foodborne pathogens. Besides providing an excellent conductive and soluble rGO nanocomposite, the AP dye also acts as an electroactive indicator for redox reactions...
October 13, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28987409/enhance-wastewater-biological-treatment-through-the-bacteria-induced-graphene-oxide-hydrogel
#4
Liang Shen, Ziheng Jin, Dian Wang, Yuanpeng Wang, Yinghua Lu
The interaction between bacteria and graphene-family materials like pristine graphene, graphene oxide (GO) and reduced graphene oxide (rGO) is such an elusive issue that its implication in environmental biotechnology is unclear. Herein, two kinds of self-assembled bio-rGO-hydrogels (BGHs) were prepared by cultivating specific Shewanella sp. strains with GO solution for the first time. The microscopic examination by SEM, TEM and CLSM indicated a porous 3D structure of BGHs, in which live bacteria firmly anchored and extracellular polymeric substances (EPS) abundantly distributed...
September 24, 2017: Chemosphere
https://www.readbyqxmd.com/read/28968591/implication-of-graphene-oxide-in-cd-contaminated-soil-a-case-study-of-bacterial-communities
#5
Ting Xiong, Xingzhong Yuan, Hou Wang, Lijian Leng, Hui Li, Zhibin Wu, Longbo Jiang, Rui Xu, Guangming Zeng
The application of graphene oxide (GO) has attracted increasing concerns in the past decade regarding its environmental impacts, except for the impact of GO on a metal-contaminated soil system, due to its special properties. In the present work, the effects of GO on the migration and transformation of heavy metals and soil bacterial communities in Cd-contaminant soil were systematically evaluated. Soil samples were exposed to different doses of GO (0, 1, and 2 g kg(-1)) over 60 days. The Community Bureau of Reference (BCR) sequential extraction procedure was used to reflect the interaction between GO and Cd...
September 29, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28961500/chronic-toxicity-of-graphene-and-graphene-oxide-in-sequencing-batch-bioreactors-a-comparative-investigation
#6
Hang N Nguyen, Debora F Rodrigues
The present study investigates the chronic toxicity of graphene (G) and graphene oxide (GO) in activated sludge. Sequencing batch bioreactors were fed with influents containing 0, 1 and 5mgL(-1) of GO or G (12h cycles) for ten days. Reduction in performance of the bioreactors in relation to chemical oxygen demand, ammonia and phosphate removals was observed after three days in the bioreactors fed with 5mgL(-1) of nanomaterials. After about eight days, these reactors reached a steady state nutrient removal, which corresponded to recovery of certain groups of ammonia oxidizing bacteria and phosphate accumulating bacteria despite the increasing accumulation of nanomaterials in the sludge...
September 20, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28949519/pyrosequencing-reveals-soil-enzyme-activities-and-bacterial-communities-impacted-by-graphene-and-its-oxides
#7
Yan Rong, Yi Wang, Yina Guan, Jiangtao Ma, Zhiqiang Cai, Guanghua Yang, Xiyue Zhao
Graphene (GN) and graphene oxides (GOs) are novel carbon nanomaterial; they have been attracting much attention because of their excellent properties and are widely applied in many areas, including energy, electronics, biomedicine, environmental science, etc. With industrial production and consumption of GN/GO, they will inevitably enter the soil and water environments. GN/GO may directly cause certain harm to microorganisms and lead to ecological and environmental risks. GOs are GN derivatives with abundant oxygen-containing functional groups in their graphitic backbone...
October 10, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28910678/colorimetric-aptasensor-for-the-detection-of-salmonella-enterica-serovar-typhimurium-using-znfe2o4-reduced-graphene-oxide-nanostructures-as-an-effective-peroxidase-mimetics
#8
Shijia Wu, Nuo Duan, Yueting Qiu, Jinghong Li, Zhouping Wang
A new colorimetric aptasensor platform was fabricated to detect Salmonella enterica serovar typhimurium based on the peroxidase-like activity of ZnFe2O4-reduced graphene oxide (ZnFe2O4/rGO) nanostructures. The synthesized ZnFe2O4/rGO can catalytically oxidize 3,3',5,5'-tetramethylbenzidine (TMB) by H2O2 and generate a typical blue product, which was detected by micro-reader at 652nm. Therefore, ZnFe2O4/rGO was conjugated with aptamer to act as the signal probe. Biotin modified aptamer was immobilized onto the micro-plate to act as the capture probe...
September 6, 2017: International Journal of Food Microbiology
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
#9
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
#10
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
#11
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
#12
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 30, 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
#13
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
#14
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
#15
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
#16
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
#17
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...
November 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28685628/bacteriomimetic-poly-%C3%AE-glutamic-acid-surface-coating-for-hemocompatibility-and-safety-of-nanomaterials
#18
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 26, 2017: Nanotoxicology
https://www.readbyqxmd.com/read/28677651/effect-of-precursor-on-antifouling-efficacy-of-vertically-oriented-graphene-nanosheets
#19
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
#20
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
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