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https://www.readbyqxmd.com/read/30321619/light-responsive-nanomedicine-for-biophotonic-imaging-and-targeted-therapy
#1
REVIEW
Jihwan Son, Gawon Yi, Jihye Yoo, Changhee Park, Heebeom Koo, Hak Soo Choi
Nanoparticles (NPs) play a key role in nanomedicine in multimodal imaging, drug delivery and targeted therapy of human diseases. Consequently, due to the attractive properties of NPs including high stability, high payload, multifunctionality, design flexibility, and efficient delivery to target tissues, nanomedicine employs various types of NPs to enhance targeting and treatment efficacy. In this review, we primarily focus on light-responsive materials, such as fluorophores, photosensitizers, semiconducting polymers, carbon structures, gold particles, quantum dots, and upconversion crystals, for their biomedical applications...
October 12, 2018: Advanced Drug Delivery Reviews
https://www.readbyqxmd.com/read/30306169/peroxidase-mimicking-dnazymes-degrade-graphene-oxide
#2
Rajendra Kurapati, Alberto Bianco
DNAzymes made of supramolecular guanine-rich G-quadruplexes and hemin are attracting a lot of interest due to their peroxidase activity mimicking the natural enzyme horseradish peroxidase (HRP). Herein, we demonstrate that DNAzyme consisting of a PS2.M-hemin complex can be an alternative to natural HRP for the oxidation and degradation of graphene oxide (GO). The degradation of GO sheets was carried out by incubating the PS2.M-hemin complex in the presence of hydrogen peroxide for 30 days. The degradation of GO has been confirmed using transmission electron microscopy and 2d Raman mapping...
October 11, 2018: Nanoscale
https://www.readbyqxmd.com/read/30300443/nanoenvelopes-wrapping-a-single-walled-carbon-nanotube-with-graphene-using-an-atomic-force-microscope
#3
REVIEW
Xiao Hu, Hang Wei, Jia Liu, Jian Zhang, Xiannian Chi, Peng Jiang, Lianfeng Sun
Engineering the morphology and structure of low-dimensional carbon nanomaterials is important to study their mechanical and electrical properties and even superconductivity. Herein, first the techniques that are used to engineer carbon nanotubes, including manipulation, morphology modification, and fabrication of complex nanostructures, are reviewed. This is followed by a summary of the methods applied to fabricate graphene nanostructures, such as heterostructures and nanoenvelopes of graphene. Lastly, an insight into the applications of low-dimensional-carbon-based electronics is given, such as carbon nanotube (CNT) transistors, graphene-based nanoenvelopes, and graphene-contacted CNT field-effect transistors (FETs), which are promising components in future electronics...
October 9, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30298128/electrocatalysis-of-lindane-using-antimony-oxide-nanoparticles-based-swcnt-pani-nanocomposites
#4
Kgotla K Masibi, Omolola E Fayemi, Abolanle S Adekunle, El-Sayed M Sherif, Eno E Ebenso
This work describes the chemical synthesis of antimony oxide nanoparticles (AONPs), polyaniline (PANI), acid functionalized single-walled carbon nanotubes (fSWCNTs), and the nanocomposite (AONP-PANI-SWCNT) as catalyst for the trace detection of lindane. Successful synthesis of the nanomaterials was confirmed by Fourier transform infrared (FT-IR) spectroscopy, ultraviolet-visible (UV-Vis) spectroscopy, x-ray diffraction (XRD) spectroscopy, and scanning electron microscopy (SEM). Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used for investigating the electrochemical behavior of the modified electrodes in the ferrocyanide/ferricyanide ([Fe(CN)6 ]4- /[Fe(CN)6 ]3- ) redox probe...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/30278907/development-of-a-cobalt-ii-phthalocyanine-mwcnt-modified-carbon-paste-electrode-for-the-detection-of-polyunsaturated-fatty-acids
#5
Anita Jerković, Sandra Abou-Ahmed, Paul Ertl, Barbara Stoeßl, Vanessa Lengauer, Anchalee Samphao, Kurt Kalcher, Gerd Leitinger, Stefan Wernitznig, Astrid Ortner
In this work the development of an electrochemical sensor for the determination of polyunsaturated fatty acids (PUFAs), in particular linoleic acid, in commercially available safflower oil as complex matrix is described. The sensor consists of a carbon paste electrode with cobalt(II) phthalocyanine, Co(II)Pc, as mediator and multiwalled carbon-nanotubes (MWCNT) as nanomaterial. As carrier medium a sodium borate buffer (0.1 M, pH 9) was used. PUFAs were detected at a working voltage of 0.35-0.45 V (vs. Ag/AgCl)...
December 14, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30277245/photochemical-strategies-for-the-green-synthesis-of-ultrathin-au-nanosheets-using-photoinduced-free-radical-generation-and-their-catalytic-properties
#6
Suisui He, Jun Hai, Tianrong Li, Sha Liu, Fengjuan Chen, Baodui Wang
Two-dimensional gold nanosheets represent a class of materials with excellent chemical and structural properties, which are often prepared using a template or toxic CO in organic solvents. Here, we report methylene blue (MB) radicals as a reducing agent to grow freestanding hexagonal ultrathin Au nanosheets with well-tuned thicknesses in water. This is the first time that carbon organic radicals have been used as a reducing agent in metal nanosheet synthesis. Notably, no template is used throughout the synthesis process, and the yield of Au nanosheets is very high...
October 21, 2018: Nanoscale
https://www.readbyqxmd.com/read/30276904/electronic-and-structural-engineering-of-carbon-based-metal-free-electrocatalysts-for-water-splitting
#7
REVIEW
Xuesi Wang, Anthony Vasileff, Yan Jiao, Yao Zheng, Shi-Zhang Qiao
Since first being reported as possible electrocatalysts to substitute platinum for the oxygen reduction reaction (ORR), carbon-based metal-free nanomaterials have been considered a class of promising low-cost materials for clean and sustainable energy-conversion reactions. However, beyond the ORR, the development of carbon-based catalysts for other electrocatalytic reactions is still limited. More importantly, the intrinsic activity of most carbon-based metal-free catalysts is inadequate compared to their metal-based counterparts...
October 1, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30273880/graphitic-carbon-nitride-g-c-3-n-4-based-photocatalysts-for-water-disinfection-and-microbial-control-a-review
#8
REVIEW
Chi Zhang, Yi Li, Danmeng Shuai, Yun Shen, Wei Xiong, Linqiong Wang
Microbial contamination in drinking water is of great concern around the world because of high pathogenic risks to humans. Semiconductor photocatalysis has aroused an increasing interest as a promising environmental remediation technology for water disinfection and microbial control. Among various photocatalysts, graphitic carbon nitride (g-C3 N4 ), as a fascinating two-dimensional conjugated polymer consisting of low-cost, earth-abundant elements, has drawn broad attention as a robust, metal-free, and visible-light-active material in the fields of both environmental remediation and solar energy conversion...
September 24, 2018: Chemosphere
https://www.readbyqxmd.com/read/30273743/graphene-oxide-induces-p62-sqstm-dependent-apoptosis-through-the-impairment-of-autophagic-flux-and-lysosomal-dysfunction-in-pc12-cells
#9
Xiaoli Feng, Lu Chen, Weihong Guo, Yaqing Zhang, Xuan Lai, Longquan Shao, Yiping Li
Graphene oxide (GO), as a two-dimensional carbon nanosheet, has been extensively studied for potential biomedical applications due to its notable properties. Although a growing number of studies have investigated the adverse effects of GO nanosheets, the available toxicity data concerning GO's effect on the neuronal cells remain highly limited. In this work, we systematically investigated the toxic responses of commercially available GO on a rat pheochromocytoma-derived PC12 cell line, which was an ideal in vitro model to study the neurotoxicity of GO...
September 28, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/30265967/sensitive-detection-of-mcf-7-human-breast-cancer-cells-by-using-a-novel-dna-labeled-sandwich-electrochemical-biosensor
#10
Yuhan Yang, Yongyao Fu, Huilan Su, Li Mao, Mei Chen
The simple, rapid, sensitive, and specific detection of cancer cells plays a pivotal role in the diagnosis and prognosis of cancer. We developed a novel DNA-labeled sandwich electrochemical biosensor based on a glassy carbon electrode modified with 3D graphene and a hybrid of Au nanocages (Au NCs)/amino-functionalized multiwalled carbon nanotubes (MWCNT-NH2 ) for label-free and selective detection of MCF-7 breast cancer cells via differential pulse voltammetry. The layer-by-layer assembly and cell-detection performance of the Au NCs/MWCNTs-NH2 -based biosensor were investigated using scanning electron microscopy and electrochemical methods including cyclic voltammetry and electrochemical impedance spectroscopy...
December 30, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/30265544/probing-light-atoms-at-sub-nanometer-resolution-realization-of-scanning-transmission-electron-microscope-holography
#11
Fehmi Yasin, Tyler Harvey, Jordan J Chess, Jordan S Pierce, Colin Ophus, Peter Ercius, Benjamin McMorran
Atomic resolution imaging of light elements in electron-transparent materials has long been a challenge. Biomolecular materials, for example, are rapidly altered by incident electrons. We demonstrate a scanning transmission electron microscopy (STEM) technique, called STEM holography, capable of efficient structural analysis of beam-sensitive nanomaterials. STEM holography measures the absolute phase and amplitude of electrons passed through a specimen via interference with a vacuum reference wave. We use an amplitude-dividing nanofabricated grating to prepare multiple beams focused at the sample...
September 28, 2018: Nano Letters
https://www.readbyqxmd.com/read/30265212/a-novel-amperometric-bienzymatic-biosensor-based-on-alcohol-oxidase-coupled-pvc-reaction-cell-and-nanomaterials-modified-working-electrode-for-rapid-quantification-of-alcohol
#12
Vinita Hooda, Vikas Kumar, Anjum Gahlaut, Vikas Hooda
A new amperometric sensor has been fabricated for sensitive and rapid quantification of ethanol. The biosensor assembly was prepared by covalently immobilizing alcohol oxidase (AOX) from Pichia pastoris onto chemically modified surface of polyvinylchloride (PVC) beaker with glutaraldehyde as a coupling agent followed by immobilization of horseradish peroxidase (HRP), silver nanoparticles (AgNPs), chitosan (CHIT), carboxylated multi-walled carbon nanotubes (c-MWCNTs) and nafion (Nf) nanocomposite onto the surface of Au electrode (working electrode)...
September 28, 2018: Preparative Biochemistry & Biotechnology
https://www.readbyqxmd.com/read/30264558/sers-active-3d-interconnected-nanocarbon-web-toward-nonplasmonic-in-vitro-sensing-of-hela-cells-and-fibroblasts
#13
A K M Rezaul Haque Chowdhury, Bo Tan, Krishnan Venkatakrishnan
A noninvasive intracellular component analysis technique is important in cancer treatment and the initial identification of cancer. Carbon nanomaterials/nanostructures, such as carbon nanotubes and graphene, have little to no surface enhanced Raman scattering (SERS) ability. Because of these structures' low Raman responses, they are conjugated with gold or silver to attain the SERS-active ability to detect normal fibroblasts and HeLa cancer cells. To the best of our knowledge, the effectiveness of the individual use of carbon nanomaterials as a nonplasmonic SERS-active platform for in vitro cancer/normal cell detection has not been investigated to date...
October 9, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30262070/sensitive-electrogenerated-chemiluminescence-biosensing-method-for-the-determination-of-dna-hydroxymethylation-based-on-ru-bpy-3-2-doped-silica-nanoparticles-labeling-and-mos-2-poly-acrylic-acid-nanosheets-modified-electrode
#14
Huiping Sun, Huan Wang, Wanqiao Bai, Lin Bao, Jianxun Lin, Yan Li
5-Hydroxymethylcytosine (5-hmC), an oxidation product of 5-mC (5-methylcytosine), is presented in DNA of most mammalian cells and play an important role in the alteration of cancer-related genes. Herein, a sensitive electrogenerated chemiluminescence (ECL) biosensing method for the determination of 5-hmC in DNA (5-hmC DNA) was established on the basis of chemical modification and nanomaterial amplification. First, electrochemically reduced molybdenum disulfide-poly(acrylic acid) (rMoS2 -PAA) nanosheets were used to modify glassy carbon electrode (GCE) to form an ECL biosensing electrode (rMoS2 -PAA/GCE) which has large accessible surface area to immobilize more DNA...
January 1, 2019: Talanta
https://www.readbyqxmd.com/read/30261251/graphene-and-graphene-oxide-functionalization-and-nano-bio-catalytic-system-for-enzyme-immobilization-and-biotechnological-perspective
#15
REVIEW
Muhammad Adeel, Muhammad Bilal, Tahir Rasheed, Ashutosh Sharma, Hafiz M N Iqbal
Graphene-based nanomaterials have gained high research interest in different fields related to proteins and thus are rapidly becoming the most widely investigated carbon-based materials. Their exceptional physiochemical properties such as electrical, optical, thermal and mechanical strength enable graphene to render graphene-based nanostructured materials suitable for applications in different fields such as electroanalytical chemistry, electrochemical sensors and immobilization of biomolecules and enzymes...
September 24, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/30259729/hydrodynamic-layer-by-layer-assembly-of-transferrable-enzymatic-conductive-nano-networks-for-enzyme-sticker-based-contact-printing-of-electrochemical-biosensors
#16
Seung-Woo Lee, Tae-Hyung Kang, Sung Ku Lee, Ki-Young Lee, Hyunjung Yi
Realizing high-performance electrochemical biosensors in a simple contact-printing-based approach significantly increases the applicability of integrated flexible biosensors. Herein, an enzyme-sticker-based approach that enables flexible and multi electrochemical sensors via simple contact-transfer-printing is reported. The enzyme sticker consists of an enzymatic conductive network film and a polymeric support. The enzyme-incorporated nanostructured conductive network showing efficient electrical coupling was assembled via hydrodynamic layer-by-layer assembly of redox enzymes, polyelectrolytes, single-walled carbon nanotubes and biological glue material, M13 phage...
September 27, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30255151/2d-titanium-carbide-mxene-for-wireless-communication
#17
Asia Sarycheva, Alessia Polemi, Yuqiao Liu, Kapil Dandekar, Babak Anasori, Yury Gogotsi
With the development of the Internet of Things (IoT), the demand for thin and wearable electronic devices is growing quickly. The essential part of the IoT is communication between devices, which requires radio-frequency (RF) antennas. Metals are widely used for antennas; however, their bulkiness limits the fabrication of thin, lightweight, and flexible antennas. Recently, nanomaterials such as graphene, carbon nanotubes, and conductive polymers came into play. However, poor conductivity limits their use. We show RF devices for wireless communication based on metallic two-dimensional (2D) titanium carbide (MXene) prepared by a single-step spray coating...
September 2018: Science Advances
https://www.readbyqxmd.com/read/30252169/mass-production-of-large-sized-nonlayered-2d-nanosheets-their-directed-synthesis-by-a-rapid-gel-blowing-strategy-and-applications-in-li-na-storage-and-catalysis
#18
Dong Wang, Weiwei Zhou, Rui Zhang, Jinjue Zeng, Yu Du, Shuai Qi, Chunxiao Cong, Chunyan Ding, Xiaoxiao Huang, Guangwu Wen, Ting Yu
2D nanomaterials are well suited for energy conversion and storage because of their thickness-dependent physical and chemical properties. However, current synthetic methods for translating 2D materials from the laboratory to industry cannot integrate both advantages of liquid-phase method (i.e., solution processibility, homogeneity, and massive production), and gas-phase method (i.e., high quality and large lateral size). Here, inspired by Chinese Sugar Figure Blowing Art, a rapid "gel-blowing" strategy is proposed for the mass production of 2D nonlayered nanosheets by thermally expanding the viscous gel precursors within a short time (≈1 min)...
September 4, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30251600/a-review-of-theranostics-applications-and-toxicities-of-carbon-nanomaterials
#19
Nitin Gupta, Divya Bharti Rai, Ashok Kumar Jangid, Hitesh Kulhari
BACKGROUND: In last few years, the use of modified carbon nanomaterials (CNMs) for theranostics (therapeutic and diagnosis) applications is a new and rapidly growing area in pharmacy and medical fields. Owing to this, their unique physical and chemical properties like high stability, high drug loading with high surface to volume ratio, low toxicity are mainly responsible to be considered those as smart nanomaterials. OBJECTIVE: This review describes the different sizes, shapes, and dimensions of carbon-based nanocarriers including 0-D fullerene, 1-D CNTs, and 2-D graphene and graphene oxide and their surface modification with different biocompatible and biodegradable molecules via covalent or non-covalent functionalization...
September 24, 2018: Current Drug Metabolism
https://www.readbyqxmd.com/read/30249320/nanoparticle-based-laser-desorption-ionization-mass-spectrometric-analysis-of-drugs-and-metabolites
#20
REVIEW
Han-Wei Chu, Binesh Unnikrishnan, Anisha Anand, Ju-Yi Mao, Chih-Ching Huang
Nanoparticle-assisted laser desorption/ionization mass spectrometry (LDI-MS) is a powerful tool for the analysis of a wide range of molecules. Many of the drawbacks in the matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) can be avoided with the application of nanomaterials as matrices as well as substrates for the LDI-MS to achieve a low background noise in low m/z region and high reproducibility. Surface-assisted LDI (SALDI)-MS, especially the nanoparticle-based LDI-MS, has emerged as a promising technique for the analysis of trace amounts of substances in various biological samples due to their high surface area for analyte enrichment, efficient desorption/ionization, and homogeneous crystallization of sample...
October 2018: Journal of Food and Drug Analysis
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