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https://www.readbyqxmd.com/read/28198615/antibacterial-activities-of-graphene-oxide-molybdenum-disulfide-nanocomposite-films
#1
Tae In Kim, Buki Kwon, Jonghee Yoon, Ick-Joon Park, Gyeong Sook Bang, YongKeun Park, Yeon-Soo Seo, Sung-Yool Choi
Two-dimensional (2D) nanomaterials, such as graphene-based materials and transition metal dichalcogenide (TMD) nanosheets, are promising materials for biomedical applications owing to their remarkable cytocompatibility and physicochemical properties. Based on their potent antibacterial properties, 2D materials have potential as antibacterial films, wherein the 2D nanosheets are immobilized on the surface and the bacteria may contact with the basal planes of 2D nanosheets dominantly rather than contact with the sharp edges of nanosheets...
February 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28160653/monitoring-of-microbial-cell-viability-using-nanostructured-electrodes-modified-with-graphene-alumina-nanocomposite
#2
Rabeay Y A Hassan, Moataz M Mekawy, Pankaj Ramnani, Ashok Mulchandani
Microbial infections are rapidly increasing; however most of the existing microbiological and molecular detection methods are time consuming and/or cannot differentiate between the viable and dead cells which may overestimate the risk of infections. Therefore, a bioelectrochemical sensing platform with a high potential to the microbial-electrode interactions was designed based on decorated graphene oxide (GO) sheet with alumina (Al2O3) nanocrystals. GO-Al2O3 nanocomposite was synthesized using self-assembly of GO and Al2O3 and characterized using the scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD), Raman-spectroscopy, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV)...
May 15, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28147710/preparation-of-iron-oxide-nanoparticles-decorated-carbon-nanotube-using-laser-ablation-in-liquid-and-their-antimicrobial-activity
#3
Khawla S Khashan, Ghassan M Sulaiman, Rafal Mahdi
The antimicrobial activity was investigated for iron oxide IO nanoparticles (NPs)-decorated carbon nanotubes CNT prepared successfully by Nd:YAG-pulsed laser ablation in the liquid process. TEM reveals the composite NP and exhibits semispherical of iron oxide NPs, which aggregate around rolled and unrolled graphene sheet. XRD pattern proved the presence of carbon and different phases of IO NPs. Then, the antibacterial activity of the NPs was examined against different bacteria using nutrient broth and nutrient agar methods, which was enhanced using IO...
February 1, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28112908/enhanced-photothermal-bactericidal-activity-of-the-reduced-graphene-oxide-modified-by-cationic-water-soluble-conjugated-polymer
#4
Linhong Xiao, Jinhua Sun, Libing Liu, Rong Hu, Huan Lu, Chungui Cheng, Yong Huang, Shu Wang, Jianxin Geng
Surface modification of graphene is extremely important for applications. Here, we report a grafting-through method for grafting water-soluble polythiophenes onto reduced graphene oxide (RGO) sheets. As a result of tailoring of the side chains of the polythiophenes, the modified RGO sheets, that is, RGO-g-P3TOPA and RGO-g-P3TOPS, are positively and negatively charged, respectively. The grafted water-soluble polythiophenes provide the modified RGO sheets with good dispersibility in water and high photothermal conversion efficiencies (ca...
February 3, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28063357/graphene-quantum-dots-with-nitrogen-doped-content-dependence-for-highly-efficient-dual-modality-photodynamic-antimicrobial-therapy-and-bioimaging
#5
Wen-Shuo Kuo, Hua-Han Chen, Shih-Yao Chen, Chia-Yuan Chang, Pei-Chi Chen, Yung-I Hou, Yu-Ting Shao, Hui-Fang Kao, Chih-Li Lilian Hsu, Yi-Chun Chen, Shean-Jen Chen, Shang-Rung Wu, Jiu-Yao Wang
Reactive oxygen species is the main contributor to photodynamic therapy. The results of this study show that a nitrogen-doped graphene quantum dot, serving as a photosensitizer, was capable of generating a higher amount of reactive oxygen species than a nitrogen-free graphene quantum dot in photodynamic therapy when photoexcited for only 3 min of 670 nm laser exposure (0.1 W cm(-2)), indicating highly improved antimicrobial effects. In addition, we found that higher nitrogen-bonding compositions of graphene quantum dots more efficiently performed photodynamic therapy actions than did the lower compositions that underwent identical treatments...
December 22, 2016: Biomaterials
https://www.readbyqxmd.com/read/28054670/ultra-sensitive-detection-of-kanamycin-for-food-safety-using-a-reduced-graphene-oxide-based-fluorescent-aptasensor
#6
Na-Reum Ha, In-Pil Jung, Im-Joung La, Ho-Sup Jung, Moon-Young Yoon
Overuse of antibiotics has caused serious problems, such as appearance of super bacteria, whose accumulation in the human body through the food chain is a concern. Kanamycin is a common antibiotic used to treat diverse infections; however, residual kanamycin can cause many side effects in humans. Thus, development of an ultra-sensitive, precise, and simple detection system for residual kanamycin in food products is urgently needed for food safety. In this study, we identified kanamycin-binding aptamers via a new screening method, and truncated variants were analyzed for optimization of the minimal sequence required for target binding...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28054094/antibacterial-mechanisms-of-graphene-based-composite-nanomaterials
#7
REVIEW
Mauricio D Rojas-Andrade, Gustavo Chata, Dara Rouholiman, Junli Liu, Chad Saltikov, Shaowei Chen
Pathogenic bacteria are gaining resistance to conventional antibiotics at an alarming rate due to overuse and rapid transfer of resistance genes between bacterial populations. As bacterial resistance to antibiotics causes millions of fatalities worldwide, it is of urgent importance to develop a new class of antibiotic materials with both broad-spectrum bactericidal activity and suitable biocompatibility. Graphene derivatives are rapidly emerging as an extremely promising class of antimicrobial materials due to their diverse bactericidal mechanisms and relatively low cytotoxicity towards mammalian cells...
January 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28039790/degradation-photocatalysis-of-tetrodotoxin-as-a-poison-by-gold-doped-pdo-nanoparticles-supported-on-reduced-graphene-oxide-nanocomposites-and-evaluation-of-its-antibacterial-activity
#8
Ali Fakhri, Mahsa Naji
In this project, synthesis of pure and gold doped PdO-reduced graphene oxide nanocomposites by sonochemical and deposition-precipitation process was performed and characterized using X-ray diffraction (XRD), transmission electronic microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The specific surface area of synthesized un-doped and Au doped PdO-RGO nanocomposites is 83.2, 109.1m(2)g(-1) and total pore volume is 0.31, 0.40cm(3)g(-1), respectively. With Tetrodotoxin as a target pollutant, photocatalytic system of UV+photocatalyst+H2O2 was set up...
December 23, 2016: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28033744/influence-of-sio2-and-graphene-oxide-nanoparticles-on-efficiency-of-biological-removal-process
#9
Seyyed Hamid Esmaeili-Faraj, Mohsen Nasr Esfahany
The effects of the presence of synthesized silica (SS) and exfoliated graphene oxide (EGO) on the removal of sulfide ion with activated sludge (AS) are experimentally investigated. The maximum removal efficiency of sulfide ion for AS without nanoparticles, and the samples with SS and EGO nanoparticles were 81%, 88% and 79%, respectively. Moreover, the maximum elimination capacity (ECmax) for the bioreactor with SS-nanoparticles is 7542 mg/L s, while the ECmax of AS and EGO samples were 7075 and 6625 mg/L s, respectively...
January 19, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28027944/antibiofilm-efficacy-of-green-synthesized-graphene-oxide-silver-nanocomposite-using-lagerstroemia-speciosa-floral-extract-a-comparative-study-on-inhibition-of-gram-positive-and-gram-negative-biofilms
#10
Shatavari Kulshrestha, Shariq Qayyum, Asad U Khan
Biofilm architecture provides bacteria with enhanced antibiotic resistance, thus raising the need to search for alternative therapies that can inhibit the bacterial colonization. In the present study, we synthesized graphene oxide-silver nanocomposite (GO-Ag) by non-toxic and eco-friendly route using a floral extract of Legistromia speciosa (L.) Pers. The gas chromatography-mass spectrometry (GC-MS) analysis of plant extract revealed the presence of compounds which can simultaneously act as reducing and capping agents...
December 24, 2016: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28025561/synthesis-characterization-and-bactericidal-evaluation-of-chitosan-guanidine-functionalized-graphene-oxide-composites
#11
Ping Li, Yangyang Gao, Zijia Sun, Dan Chang, Ge Gao, Alideertu Dong
In response to the wide spread of microbial contamination induced by bacterial pathogens, the development of novel materials with excellent antibacterial activity is of great interest. In this study, novel antibacterial chitosan (CS) and polyhexamethylene guanidine hydrochloride (PHGC) dual-polymer-functionalized graphene oxide (GO) (GO-CS-PHGC) composites were designed and easily fabricated. The as-prepared materials were characterized by Fourier transform infrared (FTIR), X-ray photoelectron spectrometer (XPS), field emission scanning electron microscopy (FE-SEM), transmission electron microscope (TEM), thermogravimetric analysis (TGA) and Raman spectroscopy...
December 23, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28024366/identification-and-optimization-of-carbon-radicals-on-hydrated-graphene-oxide-for-ubiquitous-antibacterial-coatings
#12
Ruibin Li, Nikhita D Mansukhani, Linda M Guiney, Zhaoxia Ji, Yichao Zhao, Chong Hyun Chang, Christopher T French, Jeff F Miller, Mark C Hersam, Andre E Nel, Tian Xia
While the antibacterial properties of graphene oxide (GO) have been demonstrated across a spectrum of bacteria, the critical role of functional groups is unclear. To address this important issue, we utilized reduction and hydration methods to establish a GO library with different oxidation, hydroxyl, and carbon radical (•C) levels that can be used to study the impact on antibacterial activity. Using antibiotic-resistant bacteria as a test platform, we found that the •C density is most proximately associated with bacterial killing...
December 27, 2016: ACS Nano
https://www.readbyqxmd.com/read/28012417/synthesis-and-characterization-of-mns2-reduced-graphene-oxide-nanohybrids-for-with-photocatalytic-and-antibacterial-activity
#13
Ali Fakhri, Delaram Salehpour Kahi
A facile one-step hydrothermal route was developed here to prepare MnS2/reduced graphene oxide nanohybrids. The crystal morphologies could be controlled by adjusting the solvent, surfactant, and pH of the precursor solution. X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), UV-Vis absorption spectra, and photoluminescence spectra (PL), were used to characterize the structures of the samples were used to characterize the structures of the samples, and the specific surface area was determined using the Brunauer-Emmett-Teller (BET) method...
January 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28012318/graphene-interfaced-electrical-biosensor-for-label-free-and-sensitive-detection-of-foodborne-pathogenic-e-coli-o157-h7
#14
Ashish Pandey, Yasar Gurbuz, Volkan Ozguz, Javed H Niazi, Anjum Qureshi
E. coli O157:H7 is an enterohemorrhagic bacteria responsible for serious foodborne outbreaks that causes diarrhoea, fever and vomiting in humans. Recent foodborne E. coli outbreaks has left a serious concern to public health. Therefore, there is an increasing demand for a simple, rapid and sensitive method for pathogen detection in contaminated foods. In this study, we developed a label-free electrical biosensor interfaced with graphene for sensitive detection of pathogenic bacteria. This biosensor was fabricated by interfacing graphene with interdigitated microelectrodes of capacitors that were biofunctionalized with E...
May 15, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28004574/wrinkled-surface-mediated-antibacterial-activity-of-graphene-oxide-nanosheets
#15
Fengming Zou, Hongjian Zhou, Do Young Jeong, Junyoung Kwon, Seong Un Eom, Tae Jung Park, Suck Won Hong, Jaebeom Lee
Surface wrinkles are commonly observed in large-scale of graphene films. As a new feature, the wrinkled surface of graphene films may directly affect bacterial viability by means of various interactions of bacterial cells with graphene sheets. In the present study, we introduce a wrinkled surface geometry of graphene oxide (GO) thin films for antibacterial application. Highly wrinkled GO films were formed by vacuum filtration of a GO suspension through a prestrained filter. Several types of wrinkled GO surfaces were obtained with different roughness grades determined by root-mean-square values...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28003049/toxicity-and-transformation-of-graphene-oxide-and-reduced-graphene-oxide-in-bacteria-biofilm
#16
Zhiling Guo, Changjian Xie, Peng Zhang, Junzhe Zhang, Guohua Wang, Xiao He, Yuhui Ma, Bin Zhao, Zhiyong Zhang
Impact of graphene based material (GNMs) on bacteria biofilm has not been well understood yet. In this study, we compared the impact of graphene oxide (GO) and reduced graphene oxide (rGO) on biofilm formation and development in Luria-Bertani (LB) medium using Escherichia coli and Staphylococcus aureus as models. GO significantly enhanced the cell growth, biofilm formation, and biofilm development even up to a concentration of 500mg/L. In contrast, rGO (≥50mg/L) strongly inhibited cell growth and biofilm formation...
February 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/27993003/nanoarchitecture-based-sers-for-biomolecular-fingerprinting-and-label-free-disease-markers-diagnosis
#17
Sudarson Sekhar Sinha, Stacy Jones, Avijit Pramanik, Paresh Chandra Ray
Surface-enhanced Raman spectroscopy (SERS) fingerprinting is highly promising for identifying disease markers from complex mixtures of clinical sample, which has the capability to take medical diagnoses to the next level. Although vibrational frequency in Raman spectra is unique for each biomolecule, which can be used as fingerprint identification, it has not been considered to be used routinely for biosensing due to the fact that the Raman signal is very weak. Contemporary SERS has been demonstrated to be an excellent analytical tool for practical label-free sensing applications due its ability to enhance Raman signals by factors of up to 10(8)-10(14) orders of magnitude...
December 20, 2016: Accounts of Chemical Research
https://www.readbyqxmd.com/read/27934199/graphene-oxide-inhibits-antibiotic-uptake-and-antibiotic-resistance-gene-propagation
#18
Wei Zou, Xiaokang Li, Ziyang Lai, Xingli Zhang, Xiangang Hu, Qixing Zhou
Antibiotics and antibiotic resistance genes (ARGs) in the natural environment have become substantial threats to the ecosystem and public health. Effective strategies to control antibiotics and ARG contaminations are emergent. A novel carbon nanomaterial, graphene oxide (GO), has attracted a substantial amount of attention in environmental fields. This study discovered the inhibition effects of GO on sulfamethoxazole (SMZ) uptake for bacteria and ARG transfer among microorganisms. GO promoted the penetration of SMZ from intracellular to extracellular environments by increasing the cell membrane permeability...
December 7, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27920430/biomimetic-antimicrobial-cloak-by-graphene-oxide-agar-hydrogel
#19
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/27918604/real-time-naked-eye-multiplex-detection-of-toxins-and-bacteria-using-aiegens-with-the-assistance-of-graphene-oxide
#20
Ruoyu Zhang, Xiaolei Cai, Guangxue Feng, Bin Liu
Toxins and bacteria in water or food pose a threat to human life and could potentially be exploited for bioterrorism. Real-time naked-eye detection of these contaminants is highly desirable to provide a direct and simple analytical method and address the challenges of the existing strategies. Using the detection of ricin and B. subtilis as an example, a naked-eye multiplex detection model is established. In this work, a green fluorogen with aggregation-induced emission (AIE) characteristics was encapsulated in silica nanoshells...
February 1, 2017: Faraday Discussions
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