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Carboxylated single walled carbon nanotubes

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https://www.readbyqxmd.com/read/28958131/global-transcriptional-responses-of-denitrifying-bacteria-to-functionalized-single-walled-carbon-nanotubes-revealed-by-weighted-gene-coexpression-network-analysis
#1
Xiong Zheng, Yinglong Su, Yinguang Chen, Haining Huang, Qiuting Shen
Functionalized single-walled carbon nanotubes (f-SWNTs) are widely used in many fields due to the unique structure and the excellent properties. Although these nanomaterials have been reported to enable to cause negative effects on denitrifying bacteria once they enter the environment, the toxic behaviors and regulatory mechanisms of f-SWNTs to denitrification remain unclear. In this study, the denitrification performance of a model denitrifier exposed to pristine and functionalized SWNTs was investigated, and the global transcriptional responses were comprehensively explored by RNA-seq and weighted gene-coexpression network analysis (WGCNA)...
September 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28828284/influence-of-cntrene-%C3%A2-c100lm-carbon-nanotube-material-on-the-growth-and-regulation-of-escherichia-coli
#2
Brittany Twibell, Kalie Somerville, Geoffrey Manani, Molly Duszynski, Adam Wanekaya, Paul Schweiger
The growing use of carbon nanotubes (CNTs) in industrial and consumer products raises important questions about their environmental fate and impact on prokaryotes. In the environment, CNTs are exposed to a variety of conditions (e.g., UV light) that could lead to decomposition and changes in their chemical properties. Therefore, the potential cytotoxic effect of both pristine and artificially aged carboxyl functionalized CNTRENE(®) C100LM CNTmaterial at neutral and acidic conditions on Escherichia coli K12 was analyzed using a minimal inhibitory concentration (MIC) assay, which also allowed monitoring of non-lethal growth effects...
2017: PeerJ
https://www.readbyqxmd.com/read/28780443/a-dna-biosensor-based-on-gold-nanoparticle-decorated-on-carboxylated-multi-walled-carbon-nanotubes-for-gender-determination-of-arowana-fish
#3
Kasra Saeedfar, Lee Yook Heng, Chew Poh Chiang
Multi-wall carbon nanotubes (MWCNTs) were modified to design a new DNA biosensor. Functionalized MWCNTs were equipped with gold nanoparticles (GNPs) (~15nm) (GNP-MWCNTCOOH) to construct DNA biosensors based on carbon-paste screen-printed (SPE) electrodes. GNP attachment onto functionalized MWCNTs was carried out by microwave irradiation and was confirmed by spectroscopic studies and surface analysis. DNA biosensors based on differential pulse voltammetry (DPV) were constructed by immobilizing thiolated single-stranded DNA probes onto GNP-MWCNTCOOH...
December 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28742321/understanding-the-effect-of-functional-groups-on-the-seeded-growth-of-copper-on-carbon-nanotubes-for-optimizing-electrical-transmission
#4
Kourtney D Wright, Cathren E Gowenlock, Joseph C Bear, Andrew R Barron
We present a study of the seeded growth of copper on the surface of two classes of single-walled carbon nanotubes (SWNTs) in order to compare the effects of surface functional groups. Pyridine-functionalized HiPco SWNTs and ultrashort SWNTs (US-SWNTs) were synthesized (py-SWNTs and py-US-SWNTs, respectively), and the functionality was used as seed sites for copper, via an aqueous electroless deposition reaction, as a comparison to the carboxylic acid functionality present on piranha-etched SWNTs and the native US-SWNTs...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28733002/aggregation-kinetics-of-single-walled-carbon-nanotubes-influenced-by-the-frequency-of-ultrasound-irradiation-in-the-aquatic-environment
#5
Chang Min Park, Yasir A J Al-Hamadani, Jiyong Heo, Namguk Her, Kyoung Hoon Chu, Min Jang, Sangho Lee, Yeomin Yoon
The colloidal stability of single-walled carbon nanotubes (SWNTs) sonicated at three different ultrasonication (US) frequencies (28, 580, and 1000kHz) were investigated under environmentally relevant conditions. In particular, correlations between surface chemistry, electrokinetic potential, interaction energy, and the aggregation kinetics of the aqueous SWNTs were studied. We observed that H2O2 production is negatively correlated with the yield of hydroxylation and carboxylation of SWNTs, which was dependent on the generation of ultrasonic energy by cavity collapse during US process...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28673683/single-walled-carbon-nanotubes-swcnts-inhibit-heat-shock-protein-90-hsp90-signaling-in-human-lung-fibroblasts-and-keratinocytes
#6
COMPARATIVE STUDY
Li-Chu Ong, Yuen-Fen Tan, Boon Shing Tan, Felicia Fei-Lei Chung, Soon-Keng Cheong, Chee-Onn Leong
Single-walled carbon nanotubes (SWCNTs) are carbon-based nanomaterials that possess immense industrial potential. Despite accumulating evidence that exposure to SWCNTs might be toxic to humans, our understanding of the mechanisms for cellular toxicity of SWCNTs remain limited. Here, we demonstrated that acute exposure of short (1-3μm) and regular-length (5-30μm) pristine, carboxylated or hydroxylated SWCNTs inhibited cell proliferation in human somatic and human stem cells in a cell type-dependent manner...
August 15, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28260896/erratum-long-term-intravenous-administration-of-carboxylated-single-walled-carbon-nanotubes-induces-persistent-accumulation-in-the-lungs-and-pulmonary-fibrosis-via-the-nuclear-factor-kappa-b-pathway-corrigendum
#7
(no author information available yet)
[This corrects the article on p. 263 in vol. 12, PMID: 28115845.].
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28213260/the-fabrication-of-carbon-nanotubes-array-based-electrochemical-chiral-sensor-by-electrosynthesis
#8
Hong Zhu, Fengxia Chang, Zhiwei Zhu
How to align the single-walled carbon nanotubes (SWCNTs) onto the electrode vertically and to control their density and orientation are still a major challenge. Theoretically, properly selected chiral SWCNTs can discriminate enantiomers through their different dielectric response to the adsorption of chiral species, few reports can confirm this theoretic model. Herein, we presented a new strategy to fabricate SWCNTs array-based electrochemical chiral sensor. Carboxylated chiral SWCNTs were vertically attached to the oxidized glass carbon electrode with ethylenediamine as a linker by electrosynthesis...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28148989/nano-au-cmwcnt-modified-speb-gene-specific-amperometric-sensor-for-rapidly-detecting-streptococcus-pyogenes-causing-rheumatic-heart-disease
#9
Ankur Kaushal, Swati Singh, Ashok Kumar, Dinesh Kumar
A specific 5' NH2 labeled DNA probe of speB gene was immobilized onto the gold nanoparticles/carboxylated multi walled carbon nanotubes (Nano-Au/cMWCNT) screen printed electrode using EDC/NHS cross linking chemistry. This was followed by hybridization with 0.5-50 ng/6 µl of single stranded genomic DNA Streptococcus pyogenes infected patient throat swab samples. Electrochemical amperometric assay was deciphered by using cyclic voltammetry (CV) with methylene blue a redox indicator. The sensor had a sensitivity of 104...
March 2017: Indian Journal of Microbiology
https://www.readbyqxmd.com/read/28117122/carboxylated-single-walled-carbon-nanotube-functionalized-chiral-polymer-monoliths-for-affinity-capillary-electrochromatography
#10
Chunyue Miao, Ruihan Bai, Shujuan Xu, Tingting Hong, Yibing Ji
Carboxylated single-walled carbon nanotubes (c-SWNTs) were incorporated into poly(glycidylmethacrylate-co-ethylene glycol dimethacrylate) [poly(GMA-co-EDMA)] monoliths to develop a novel monolithic stationary phase for capillary electrochromatography. The prepared monoliths were characterized by scanning electron microscopy and nitrogen adsorption. Additionally, pepsin, which is a chiral selector, was bonded to the c-SWNT-incorporated monoliths via epoxide groups as reactive sites and glutaraldehyde as the spacer...
March 3, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28115845/long-term-intravenous-administration-of-carboxylated-single-walled-carbon-nanotubes-induces-persistent-accumulation-in-the-lungs-and-pulmonary-fibrosis-via-the-nuclear-factor-kappa-b-pathway
#11
Yue Qin, Suning Li, Gan Zhao, Xuanhao Fu, Xueping Xie, Yiyi Huang, Xiaojing Cheng, Jinbin Wei, Huagang Liu, Zefeng Lai
Numerous studies have demonstrated promising application of single-walled carbon nanotubes (SWNTs) in drug delivery, diagnosis, and targeted therapy. However, the adverse health effects resulting from intravenous injection of SWNTs are not completely understood. Studies have shown that levels of "pristine" or carboxylated carbon nanotubes are very high in mouse lungs after intravenous injection. We hypothesized that long-term and repeated intravenous administration of carboxylated SWNTs (c-SWNTs) can result in persistent accumulation and induce histopathologic changes in rat lungs...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28104471/the-intracellular-delivery-of-plasmid-dna-using-cationic-reducible-carbon-nanotube-disulfide-conjugates-of-polyethylenimine
#12
Azadeh Hashem Nia, Hossein Eshghi, Kalil Abnous, Mohammad Ramezani
A series of polyethylenimine conjugates of single-walled carbon nanotube (PEI-SWNT) containing bioreducible disulfide bonds was synthesized and evaluated for their transfection efficiency. Different molecular weights of polyethylenimine (PEI) were thiolated with different mole ratio of 2-iminothiolane (2-IT). Single-walled carbon nanotube (SWNT) was first carboxylated and then three different cysteine-functionalized SWNT formulations were synthesized via introduced linkers: a) carbonyl group b) spermidine c) 1,8-diamino 3,6-dioxo octane...
March 30, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28103039/single-walled-carbon-nanotubes-mimics-of-biological-ion-channels
#13
Hasti Amiri, Kenneth L Shepard, Colin Nuckolls, Raúl Hernández Sánchez
Here we report on the ion conductance through individual, small diameter single-walled carbon nanotubes. We find that they are mimics of ion channels found in natural systems. We explore the factors governing the ion selectivity and permeation through single-walled carbon nanotubes by considering an electrostatic mechanism built around a simplified version of the Gouy-Chapman theory. We find that the single-walled carbon nanotubes preferentially transported cations and that the cation permeability is size-dependent...
February 8, 2017: Nano Letters
https://www.readbyqxmd.com/read/28042968/effects-of-serum-albumin-on-the-degradation-and-cytotoxicity-of-single-walled-carbon-nanotubes
#14
Yun Ding, Rong Tian, Zhen Yang, Jianfa Chen, Naihao Lu
Neutrophil myeloperoxidase (MPO) and peroxynitrite (ONOO(-)) can oxidatively biodegrade carboxylated single-walled carbon nanotubes (SWCNTs). The protein-SWCNTs interactions will play an important role in the degradation and cytotoxicity of nanotubes. Here, we investigated the binding of bovine serum albumin (BSA, a common and well-characterized model blood serum protein) to SWCNTs, and found that the hydrophobic and electrostatic interactions might be crucial factors in stabilizing the binding of SWCNTs with BSA...
March 2017: Biophysical Chemistry
https://www.readbyqxmd.com/read/28042843/evaluation-of-surface-cleaning-procedures-in-terms-of-gas-sensing-properties-of-spray-deposited-cnt-film-thermal-and-o%C3%A2-plasma-treatments
#15
Joon Hyub Kim, Min-Jung Song, Ki Beom Kim, Joon-Hyung Jin, Nam Ki Min
The effect of cleaning the surface of single-walled carbon nanotube (SWNT) networks by thermal and the O₂ plasma treatments is presented in terms of NH₃ gas sensing characteristics. The goal of this work is to determine the relationship between the physicochemical properties of the cleaned surface (including the chemical composition, crystal structure, hydrophilicity, and impurity content) and the sensitivity of the SWNT network films to NH₃ gas. The SWNT networks are spray-deposited on pre-patterned Pt electrodes, and are further functionalized by heating on a programmable hot plate or by O₂ plasma treatment in a laboratory-prepared plasma chamber...
December 30, 2016: Sensors
https://www.readbyqxmd.com/read/28040213/quantification-of-carbon-nanotubes-in-different-environmental-matrices-by-a-microwave-induced-heating-method
#16
Yang He, Souhail R Al-Abed, Dionysios D Dionysiou
Carbon nanotubes (CNTs) have been incorporated into numerous consumer products, and have also been employed in various industrial areas because of their extraordinary properties. The large scale production and wide applications of CNTs make their release into the environment a major concern. Therefore, it is crucial to determine the degree of potential CNT contamination in the environment, which requires a sensitive and accurate technique for selectively detecting and quantifying CNTs in environmental matrices...
February 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28000929/in-vitro-reprotoxicity-of-carboxyl-functionalised-single-and-multi-walled-carbon-nanotubes-on-human-spermatozoa
#17
Z Aminzadeh, M Jamalan, L Chupani, H Lenjannezhadian, M A Ghaffari, M Aberomand, M Zeinali
Reproductive toxicity of carboxyl-functionalised carbon nanotubes (CNT-COOH), as the most commonly used form of water-soluble CNTs, is not clearly studied. The aim of this study was to investigate in vitro toxicity of carboxylated single-walled and multi-walled CNTs (SWCNT-COOH and MWCNT-COOH) against human spermatozoa. Sperm cells from healthy donors were incubated with 0.1-100 μg/ml of SWCNT-COOH or MWCNT-COOH at 37°C for up to 5 hr. Viability of sperm cells was assessed using MTT test, and sperm motility was evaluated following World Health Organization guideline...
November 2017: Andrologia
https://www.readbyqxmd.com/read/27885574/nadph-oxidase-dependent-degradation-of-single-walled-carbon-nanotubes-in-macrophages
#18
Yun Ding, Rong Tian, Zhen Yang, Jianfa Chen, Naihao Lu
Previous studies have shown that carboxylated single-walled carbon nanotubes (SWCNTs) could be oxidatively biodegraded by neutrophil myeloperoxidase (MPO) and peroxynitrite (ONOO(-)). However, the biodegradation mechanism of nanotubes in macrophages has not been explored enough. Here, we showed that both MPO and ONOO(-) could effectively oxidize SWCNTs to generate shorter and oxidative nanotubes in vitro. SWCNTs were significantly degraded in zymosan-stimulated macrophages, and the degradation mechanism was dependent on MPO and ONOO(-)-driven oxidative pathways of activated macrophages, where NADPH oxidase was found to be a major determinant of the biodegradation process...
January 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/27781229/electrostatics-mediated-%C3%AE-chymotrypsin-inhibition-by-functionalized-single-walled-carbon-nanotubes
#19
Daohui Zhao, Jian Zhou
The α-chymotrypsin (α-ChT) enzyme is extensively used for studying nanomaterial-induced enzymatic activity inhibition. A recent experimental study reported that carboxylized carbon nanotubes (CNTs) played an important role in regulating the α-ChT activity. In this study, parallel tempering Monte Carlo and molecular dynamics simulations were combined to elucidate the interactions between α-ChT and CNTs in relation to the CNT functional group density. The simulation results indicate that the adsorption and the driving force of α-ChT on different CNTs are contingent on the carboxyl density...
January 4, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27695672/enriched-surface-acidity-for-surfactant-free-suspensions-of-carboxylated-carbon-nanotubes-purified-by-centrifugation
#20
Elizabeth I Braun, Rockford Draper, Paul Pantano
It is well known that surfactant-suspended carbon nanotube (CNT) samples can be purified by centrifugation to decrease agglomerates and increase individually-dispersed CNTs. However, centrifugation is not always part of protocols to prepare CNT samples used in biomedical applications. Herein, using carboxylated multi-walled CNTs (cMWCNTs) suspended in water without a surfactant, we developed a Boehm titrimetric method for the analysis of centrifuged cMWCNT suspensions and used it to show that the surface acidity of oxidized carbon materials in aqueous cMWCNT suspensions was enriched by ~40% by a single low-speed centrifugation step...
June 2016: Analytical Chemistry Research
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