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https://www.readbyqxmd.com/read/29332833/a-combination-of-thiol-ene-click-chemistry-and-surface-initiated-atom-transfer-radical-polymerization-fabrication-of-boronic-acid-functionalized-magnetic-graphene-oxide-composite-for-enrichment-of-glycoproteins
#1
Jie Su, Xiwen He, Langxing Chen, Yukui Zhang
An efficient glycoproteins enrichment platform is one of vital preprocessing steps in biomarker research and in particular glycoproteomics. In this work, a well-defined boronic acid functionalized magnetic graphene oxide nanocomposite (Fe3O4-GO@PAAPBA) was synthesized for the selective enrichment of glycoproteins from complex biological samples via a novel strategy based on the "thiol-ene" click chemistry and surface initiated atom transfer radical polymerization (SI-ATRP). The initiator of ATRP was anchored to the surface of substrate through "thiol-ene" click reaction...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29332832/electrochemiluminescent-detection-of-cardiac-troponin-i-by-using-soybean-peroxidase-labeled-antibody-as-signal-amplifier
#2
Min Tang, Zhenxian Zhou, Li Shangguan, Fang Zhao, Songqin Liu
This work proposed an electrochemiluminescence (ECL) immunosensor for quantitative monitoring of cardiac troponin I (cTnI) in plasma with soybean peroxidase (SBP) labeled-antibody as signal amplifier. The ECL sandwich immunosensor was constructed by covalent binding anti-cTnI capture antibody (Ab1) to polyethylenimine-functionalized graphene matrix, which was obtained by a simple hydrothermal reaction between polyethylenimine (PEI) and graphene oxide (GO). After that, the SBP-labeled detection antibody (SBP-Ab2), synthesized by NaIO4 method, was immobilized on the surface of electrode through sandwich immunoreaction...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29332794/a-sensitive-spr-biosensor-based-on-hollow-gold-nanospheres-and-improved-sandwich-assay-with-pda-ag-fe3o4-rgo
#3
Shuo Li, Qiong Wu, Pinyi Ma, Yue Zhang, Daqian Song, Xinghua Wang, Ying Sun
A novel surface plasmon resonance (SPR) biosensor based on hollow gold nanospheres (HGNPs) and an improved sandwich assay was developed to detect rabbit IgG. The electromagnetic coupling between the HGNPs and Au film, and the notable plasmonic fields spread over the inner and outer surfaces of HGNPs, led to the considerable amplification of the SPR signal. Polydopamine-Ag@Fe3O4/reduced graphene oxide (PDA-Ag@Fe3O4/rGO) was introduced to bind detection antibody (Ab2) to form the improved sandwich structure. Ag nanoparticles were excited to produce SPR and their hot electrons were doped on graphene thin films, which amplified the response of biomolecules...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29332791/highly-sensitive-and-reproducible-non-enzymatic-glucose-sensor-fabricated-by-drop-casting-novel-nanocomposite-with-3d-architecture-and-tailorable-properties-prepared-in-controllable-way
#4
Min Ma, Taotao Zhe, Yiyue Ma, Zonghan Wang, Qiang Chen, Jianlong Wang
Novel nanocomposite has tailorable properties and ordered 3D architecture similar to the structure of materials prepared by electrodeposition which is convenient and efficient but the reproducibility is limited because of the uncontrollable preparation process, was scientifically synthetized in controllable way and used for non-enzymatic glucose sensor for the first time. Flower-like α-Ni(OH)2 with high specific surface areas and good anion transport ability benefited from its distinctive stacking faults and turbostratic disorder structure was synthesized through facile one-step hydrothermal method...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29331776/low-cost-screen-printed-electrodes-based-on-electrochemically-reduced-graphene-oxide-carbon-black-nanocomposites-for-dopamine-epinephrine-and-paracetamol-detection
#5
G Ibáñez-Redín, D Wilson, D Gonçalves, O N Oliveira
A green approach for the preparation of carbon black (CB) and electrochemically reduced graphene oxide composite (ERGO) is described based on screen printed carbon electrodes (SPCEs) fabricated on poly(ethylene terephthalate) (PET) as electrochemical sensors. This approach leads to a heterogeneous hydrophilic surface with high concentration of defect sites according to scanning electron microscopy, contact angle and Raman spectroscopy measurements. The SPCE/CB-ERGO sensor was tested with dopamine (DA), epinephrine (EP) and paracetamol (PCM), exhibiting an enhanced electrocatalytic performance compared to the bare SPCE...
December 30, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29331725/bivo4-n-rgo-nano-composites-as-highly-efficient-visible-active-photocatalyst-for-the-degradation-of-dyes-and-antibiotics-in-eco-system
#6
Brindha Appavu, Sivakumar Thiripuranthagan, Sudhakar Ranganathan, Elangovan Erusappan, Kathiravan Kannan
Herein, we report the synthesis of novel nitrogen doped reduced graphene oxide/ BiVO4 photo catalyst by single step hydrothermal method. The physicochemical properties of the catalysts were characterized using XRD, N2 adsorption-desorption, Raman, XPS, SEM TEM, DRS-UV and EIS techniques. The synthesized catalysts were tested for their catalytic activity in the photo degradation of some harmful textile dyes (methylene blue & congo red) and antibiotics (metronidazole and chloramphenicol) under visible light irradiation...
January 10, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29330486/new-generation-of-drug-delivery-systems-based-on-ginsenoside-rh2-lysine-and-arginine-treated-highly-porous-graphene-for-improving-anticancer-activity
#7
Hadi Zare-Zardini, Asghar Taheri-Kafrani, Ahmad Amiri, Abdol-Khalegh Bordbar
In this study, Rh2-treated graphene oxide (GO-Rh2), lysine-treated highly porous graphene (Gr-Lys), arginine-treated Gr (Gr-Arg), Rh2-treated Gr-Lys (Gr-Lys-Rh2) and Rh2-treated Gr-Arg (Gr-Arg-Rh2) were synthesized. MTT assay was used for evaluation of cytotoxicity of samples on ovarian cancer (OVCAR3), breast cancer (MDA-MB), Human melanoma (A375) and human mesenchymal stem cells (MSCs) cell lines. The percentage of apoptotic cells was determined by terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL) assay...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29330476/high-performance-flexible-supercapacitors-based-on-electrochemically-tailored-three-dimensional-reduced-graphene-oxide-networks
#8
Taniya Purkait, Guneet Singh, Dinesh Kumar, Mandeep Singh, Ramendra Sundar Dey
A simple approach for growing porous electrochemically reduced graphene oxide (pErGO) networks on copper wire, modified with galvanostatically deposited copper foam is demonstrated. The as-prepared pErGO networks on the copper wire are directly used to fabricate solid-state supercapacitor. The pErGO-based supercapacitor can deliver a specific capacitance (Csp) as high as 81±3 F g-1 at 0.5 A g-1 with polyvinyl alcohol/H3PO4 gel electrolyte. The Csp per unit length and area are calculated as 40.5 mF cm-1 and 283...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29329995/multifunctional-hybrid-graphene-oxide-for-circulating-tumor-cell-isolation-and-analysis
#9
Avijit PramaniK, Stacy Jones, Ye Gao, Carrie Sweet, Aruna Vangara, Salma Begum, Paresh Chandra Ray
Even in 21st century, >90% cancer-associated deaths are caused by metastatic disease. Circulating tumor cells (CTCs), which circulate in the blood stream after release from primary tumors, extravasate and form fatal metastases in different organs. Several clinical trials indicate that CTCs can be used as a liquid biopsy of tumors for early diagnosis of cancers. Since CTCs are extremely rare and exhibit heterogeneous biology due to epithelial-mesenchymal transition (EMT), oncologists continue to face enormous challenges in using CTCs as a true "liquid biopsy" for cancer patients...
January 9, 2018: Advanced Drug Delivery Reviews
https://www.readbyqxmd.com/read/29329705/low-cost-and-disposable-sensors-for-the-simultaneous-determination-of-coenzyme-q10-and-%C3%AE-lipoic-acid-using-manganese-iv-oxide-modified-screen-printed-graphene-electrodes
#10
Kanokwan Charoenkitamorn, Sudkate Chaiyo, Orawon Chailapakul, Weena Siangproh
In this work, for the first time, manganese (IV) oxide-modified screen-printed graphene electrodes (MnO2/SPGEs) were developed for the simultaneous electrochemical detection of coenzyme Q10 (CoQ10) and α-lipoic acid (ALA). This sensor exhibits attractive benefits such as simplicity, low production costs, and disposability. Cyclic voltammetry (CV) was used to characterize the electrochemical behavior of the analyte and investigate the capacitance and electroactive surface area of the unmodified and modified electrode surfaces...
April 3, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29329274/current-technologies-of-electrochemical-immunosensors-perspective-on-signal-amplification
#11
REVIEW
Il-Hoon Cho, Jongsung Lee, Jiyeon Kim, Min-Soo Kang, Jean Kyung Paik, Seockmo Ku, Hyun-Mo Cho, Joseph Irudayaraj, Dong-Hyung Kim
An electrochemical immunosensor employs antibodies as capture and detection means to produce electrical charges for the quantitative analysis of target molecules. This sensor type can be utilized as a miniaturized device for the detection of point-of-care testing (POCT). Achieving high-performance analysis regarding sensitivity has been one of the key issues with developing this type of biosensor system. Many modern nanotechnology efforts allowed for the development of innovative electrochemical biosensors with high sensitivity by employing various nanomaterials that facilitate the electron transfer and carrying capacity of signal tracers in combination with surface modification and bioconjugation techniques...
January 12, 2018: Sensors
https://www.readbyqxmd.com/read/29329206/preparation-of-cu%C3%A2-o-reduced-graphene-nanocomposite-modified-electrodes-towards-ultrasensitive-dopamine-detection
#12
Quanguo He, Jun Liu, Xiaopeng Liu, Guangli Li, Peihong Deng, Jing Liang
Cu₂O-reduced graphene oxide nanocomposite (Cu₂O-RGO) was used to modify glassy carbon electrodes (GCE), and applied for the determination of dopamine (DA). The microstructure of Cu₂O-RGO nanocomposite material was characterized by scanning electron microscope. Then the electrochemical reduction condition for preparing Cu₂O-RGO/GCE and experimental conditions for determining DA were further optimized. The electrochemical behaviors of DA on the bare electrode, RGO- and Cu₂O-RGO-modified electrodes were also investigated using cyclic voltammetry in phosphate-buffered saline solution (PBS, pH 3...
January 12, 2018: Sensors
https://www.readbyqxmd.com/read/29329009/well-controlled-in-situ-growth-of-2d-wo3-rectangular-sheets-on-reduced-graphene-oxide-with-strong-photocatalytic-and-antibacterial-properties
#13
Bilal Ahmed, Animesh K Ojha, Ajeet Singh, Florian Hirsch, Ingo Fischer, Donfack Patrice, Arnulf Materny
Finding the materials, which help to control the water pollution caused by organic and bacterial pollutants is one of the challenging tasks for the scientific community. 2D sheets of WO3 and composite of WO3 and reduced graphene oxide (rGO) have been synthesized in a well-controlled way using a hydrothermal method. The as synthesized 2D sheet of WO3 and rGO-WO3 composite were characterized by various techniques. The 2D sheets of WO3 and rGO-WO3 composite are efficiently utilized for the photocatalytic degradation of methylene blue (MB) and Rhodamine B (RhB) dyes under sunlight...
December 29, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29328670/the-surface-oxidation-of-graphene-oxide-determines-membrane-damage-lipid-peroxidation-and-cytotoxicity-in-macrophages-in-a-pulmonary-toxicity-model
#14
Ruibin Li, Linda M Guiney, Chong Hyun Chang, Nikhita D Mansukhani, Zhaoxia Ji, Xiang Wang, Yu-Pei Liao, Wen Jiang, Bingbing Sun, Mark C Hersam, Andre E Nel, Tian Xia
While 2-dimensional graphene oxide (GO) is used increasingly in biomedical applications, there is uncertainty on how specific physicochemical properties relate to biocompatibility in mammalian systems. Although properties such as lateral size and the colloidal properties of the nanosheets are important, the specific material properties that we address here is the oxidation state and reactive surface groups on the planar surface. In this study, we used a GO library, comprised of pristine, reduced (rGO), and hydrated GO (hGO), in which quantitative assessment of the hydroxyl, carboxyl, epoxy and carbon radical contents were used to study the impact on epithelial cells and macrophages, as well as in the murine lung...
January 12, 2018: ACS Nano
https://www.readbyqxmd.com/read/29328621/correction-to-improved-synthesis-of-graphene-oxide
#15
Daniela C Marcano, Dmitry V Kosynkin, Jacob M Berlin, Alexander Sinitskii, Zhengzong Sun, Alexander S Slesarev, Lawrence B Alemany, Wei Lu, James M Tour
No abstract text is available yet for this article.
January 12, 2018: ACS Nano
https://www.readbyqxmd.com/read/29328289/electrical-switching-of-birefringence-in-zirconium-phosphate-colloids-with-various-solvents
#16
Aurangzeb Rashid Masud, Seung-Ho Hong, Tian-Zi Shen, Chi-Hyo Ahn, Jang-Kun Song
Even though a graphene-oxide (GO) dispersion is attractive for electro-optical switching devices because of its high Kerr coefficient, it has several limitations such as chemical instability and optical loss due to absorption at visible wavelengths. Here we introduce the use of tetrabutylammonium-tethered α-zirconium phosphate (TBA-ZrP) colloid in various solvents for electro-optical switching devices; the TBA-ZrP colloid is chemically stable and optically transparent. We find that the electrical switching behavior of TBA-ZrP is sensitively dependent on the type of solvent...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29328051/in-situ-synthesized-sno2-nanorod-reduced-graphene-oxide-low-dimensional-structure-for-enhanced-lithium-storage
#17
Wei Zhang, Xuezhang Xiao, Yiwen Zhang, Junpeng Li, Jiayi Zhong, Meng Li, Xiulin Fan, Chuntao Wang, Lixin Chen
A unique morphology of SnO2 nanorod (NR)/reduced graphene oxide (RGO) composite has been synthesized by in-situ hydrothermal method, which is used as anode material for lithium-ion batteries. The SnO2 NR adhering on the RGO exhibit a length of 250-400 nm and diameter of 60-80 nm without any obviously aggregation. The initial discharge/charge capacities of the SnO2 NR/RGO composite are 1761.3 mAh g-1 and 1233.1 mAh g-1 with coulombic efficiency (CE) of 70 % under the current density of 200 mA g-1, and finally keep at 1101 mAh g-1 after the 50 cycles...
January 12, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29327749/fabrication-of-high-performance-graphene-nanoplatelet-based-transparent-electrodes-via-self-interlayer-exfoliation-control
#18
Jong Sik Oh, Ji Soo Oh, Da In Sung, Geun Young Yeom
Graphene nanoplatelets (GNP) have attracted considerable attention due to their high yield and fabrication route that is scalable to enable graphene production. However, the absence of a means of fabricating a transparent and conductive GNP film has been the biggest obstacle to the replacement of pristine graphene. Here, we report on a novel means of fabricating uniform and thin GNP-based high-performance transparent electrodes for flexible and stretchable optoelectronic devices involving the use of an adhesive polymer layer (PMMA) as a GNP layer controller and by forming a hybrid GNP/AgNW electrode embedded on PET or PDMS...
January 12, 2018: Nanoscale
https://www.readbyqxmd.com/read/29327589/transition-metal-dichalcogenide-nanosheets-for-visual-monitoring-pcr-rivaling-a-real-time-pcr-instrument
#19
Liu Wang, Zhicheng Huang, Rui Wang, Yibo Liu, Cheng Qian, Jian Wu, Juewen Liu
Monitoring the progress of polymerase chain reactions (PCR) is of critical importance in bioanalytical chemistry and molecular biology. While real-time PCR thermocyclers are ideal for this purpose, its high cost has limited applications in resource-poor areas. Direct visual detection would be a more attractive alternative. To monitor PCR amplification, DNA staining dyes such as SYBR Green I (SG) are often used. Although these dyes give higher fluorescence when binding to double-stranded (ds) DNA products, they also yield strong background fluorescence in the presence of a high concentration of single-stranded (ss) DNA primers...
January 12, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29327505/flexible-modulation-of-co-release-using-various-nuclearity-of-metal-carbonyl-clusters-on-graphene-oxide-for-stroke-remediation
#20
Mein Jin Tan, Han-Chi Pan, Hui Ru Tan, Jian Wei Chai, Qi Feng Lim, Ten It Wong, Xiaodong Zhou, Zi-Yao Hong, Lun-De Liao, Kien Voon Kong
Utilizing the size-dependent adsorption properties of ruthenium carbonyl clusters (Ru-carbon monoxide (CO)) onto graphene oxide (GO), a facile CO-release platform for in situ vasodilation as a treatment for stroke-related vascular diseases is developed. The rate and amount of formation of the CO-release-active RuII (CO)2 species can be modulated by a simple mixing procedure at room temperature. The subsequent thermally induced oxidation of RuII (CO)2 to RuO2 on the GO surface results in the release of CO. Further modulation of thermal and CO-release properties can be achieved via a hybridization of medium- and high-nuclearity of Ru-CO clusters that produces a RuO2 /RuII (CO)2 /6 Ru-CO-GO composite, where 6 Ru-CO-GO provides a photothermally activated reservoir of RuII (CO)2 species and the combined infrared absorption properties of GO and RuO2 provides photothermal response for in situ CO-release...
January 12, 2018: Advanced Healthcare Materials
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