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Carboxylated single walled carbon nanotubes

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https://www.readbyqxmd.com/read/29601805/adsorption-of-human-serum-albumin-on-functionalized-single-walled-carbon-nanotubes-reduced-cytotoxicity
#1
Naihao Lu, Yinhua Sui, Yun Ding, Rong Tian, Li Li, Fufeng Liu
With the potential uses of carbon nanotubes (CNTs) in biomedical and biotechnological applications, and the growing concerns about nanotoxicity of these engineered nanoparticles, the importance of protein-nanoparticle interaction has not been well stressed. In this study, we used both experimental and theoretical approaches to investigate the interactions of different functionalized single-walled CNTs (SWCNTs) with human serum albumin (HSA). It was found that the HSA adsorption capacities of CNTs followed the order carboxylated SWCNTs > hydroxylated SWCNTs > amined SWCNTs...
March 27, 2018: Chemico-biological Interactions
https://www.readbyqxmd.com/read/29526097/swnt-anchored-with-carboxylated-polythiophene-links-on-high-capacity-li-ion-battery-anode-materials
#2
Yo Han Kwon, Krysten Minnici, Jung Jin Park, Sujin R Lee, Guoyan Zhang, Esther S Takeuchi, Kenneth J Takeuchi, Amy C Marschilok, Elsa Reichmanis
Conjugated polymers possessing polar functionalities were shown to effectively anchor single-walled carbon nanotubes (SWNTs) to the surface of high-capacity anode materials, and enable the formation of electrical networks. Specifically, poly[3-(potassium-4-butanoate) thiophene] (PPBT) served as a bridge between SWNT networks and various anode materials, including monodispersed Fe3O4 spheres (sFe3O4), and silicon nanoparticles (Si NPs). The PPBT π‒conjugated backbone and carboxylate (COO‒) substituted alkyl side chains, respectively, attracted the SWNT π‒electron surface and chemically interacted with active material surface hydroxyl (‒OH) species to form a carboxylate bond...
March 10, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29468871/peptide-probe-for-multi-walled-carbon-nanotubes-electrophoretic-assessment-of-the-binding-interface-and-evaluation-of-surface-functionalization
#3
Tyler A Davis, Lisa Ann Holland
Non-covalent interactions of peptides and proteins with carbon nanotubes play a key role in sensing, dispersion and biocompatibility. Advances in these areas require that the forces which contribute to physical adsorption are understood in order that the carbon nanotubes present a degree of functionalization appropriate to the desired application. Affinity analyses of peptides are employed to evaluate the role of tryptophan and arginine residues on physical adsorption to carboxylated multi-walled carbon nanotubes...
February 22, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29189760/electrochemical-immunosensor-for-the-detection-of-aflatoxin-b%C3%A2-in-palm-kernel-cake-and-feed-samples
#4
Farah Asilah Azri, Jinap Selamat, Rashidah Sukor
Palm kernel cake (PKC) is the solid residue following oil extraction of palm kernels and useful to fatten animals either as a single feed with only minerals and vitamins supplementation, or mixed with other feedstuffs such as corn kernels or soy beans. The occurrence of mycotoxins (aflatoxins, ochratoxins, zearalenone, and fumonisins) in feed samples affects the animal's health and also serves as a secondary contamination to humans via consumption of eggs, milk and meats. Of these, aflatoxin B₁ (AFB₁) is the most toxically potent and a confirmed carcinogen to both humans and animals...
November 30, 2017: Sensors
https://www.readbyqxmd.com/read/29136795/a-regenerative-and-selective-electrochemical-aptasensor-based-on-copper-oxide-nanoflowers-single-walled-carbon-nanotubes-nanocomposite-for-chlorpyrifos-detection
#5
Guoli Xu, Danqun Huo, Changjun Hou, Yanan Zhao, Jing Bao, Mei Yang, Huanbao Fa
Chlorpyrifos is a commonly used organophosphorus pesticide in agriculture. However, its neurotoxicity poses a huge threat to human health. To detect trace amounts of chlorpyrifos, we herein developed a regenerative electrochemical aptasensor for the sensitive detection of chlorpyrifos. The nanocomposite consisting of copper oxide nanoflowers (CuO NFs) and carboxyl-functionalized single walled carbon nanotubes (c-SWCNTs) was prepared to improve the sensing performance for chlorpyrifos detection. Various characterization methods such as scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FT-IR) and cyclic voltammetry (CV) were used to demonstrate the successful fabrication of biosensor...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29096367/electrochemical-immunosensors-for-the-detection-of-survival-motor-neuron-smn-protein-using-different-carbon-nanomaterials-modified-electrodes
#6
Shimaa Eissa, Nawal Alshehri, Anas M Abdel Rahman, Majed Dasouki, Khalid M Abu-Salah, Mohammed Zourob
Spinal muscular atrophy is an untreatable potentially fatal hereditary disorder caused by loss-of-function mutations in the survival motor neuron (SMN) 1 gene which encodes the SMN protein. Currently, definitive diagnosis relies on the demonstration of biallelic pathogenic variants in SMN1 gene. Therefore, there is an urgent unmet need to accurately quantify SMN protein levels for screening and therapeutic monitoring of symptomatic newborn and SMA patients, respectively. Here, we developed a voltammetric immunosensor for the sensitive detection of SMN protein based on covalently functionalized carbon nanofiber-modified screen printed electrodes...
March 15, 2018: Biosensors & Bioelectronics
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
#7
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)...
February 1, 2018: 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
#8
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
#9
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
#10
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
#11
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 H2 O2 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
#12
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
#13
(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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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