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https://www.readbyqxmd.com/read/28738618/high-sensitivity-surface-plasmon-resonance-biosensor-for-detection-of-microrna-and-small-molecule-based-on-graphene-oxide-gold-nanoparticles-composites
#1
Qing Li, Qing Wang, Xiaohai Yang, Kemin Wang, Hua Zhang, Wenyan Nie
A versatile and sensitive surface plasmon resonance (SPR) biosensor based on two layers of graphene oxide-gold nanoparticles (GO-AuNPs) composites was designed for the detection of microRNA (miRNA) and small molecule adenosine. The bottom layer, which acted as a functionalized substrate on the sensor chip, provided a high specific surface area convenient for the immobilization of capture DNA molecules. The upper layer served as a signal-amplification element. By employing these two layers of GO-AuNPs composites, the dual amplification strategy was achieved so that a measurement of miRNA-141 with a detection limit of 0...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28727416/in-situ-electrochemical-sensing-and-real-time-monitoring-live-cells-based-on-freestanding-nanohybrid-paper-electrode-assembled-from-3d-functionalized-graphene-framework
#2
Yan Zhang, Jian Xiao, Qi-Ying Lv, Lu Wang, Xulin Dong, Muhammad Asif, Jinghua Ren, Wenshan He, Yimin Sun, Fei Xiao, Shuai Wang
In this work, we develop a new type of freestanding nanohybrid paper electrode assembled from 3D ionic liquid (IL) functionalized graphene framework (GF) decorated by gold nanoflowers (AuNFs), and explore its practical application in in-situ electrochemical sensing of live breast cell samples by real-time tracking biomarker H2O2 released from cells. The AuNFs modified IL functionalized GF (AuNFs/IL-GF) was synthesized via a facile and efficient dopamine assisted one-pot self-assembly strategy. The as-obtained nanohybrid assembly exhibits a typical 3D hierarchical porous structure, where the highly active electrocatalyst AuNFs are well dispersed on IL-GF scaffold...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28722438/graphene-oxide-upconversion-nanoparticle-based-optical-sensors-for-targeted-detection-of-mrna-biomarkers-present-in-alzheimer-s-disease-and-prostate-cancer
#3
Patrick Vilela, Afaf El-Sagheer, Timothy M Millar, Tom Brown, Otto L Muskens, Antonios G Kanaras
The development of new sensors for the accurate detection of biomarkers in biological fluids is of utmost importance for the early diagnosis of diseases. Next to advanced laboratory techniques, there is a need for relatively simple methods which can significantly broaden the availability of diagnostic capability. Here, we demonstrate the successful application of a sensor platform based on graphene oxide and upconversion nanoparticles (NPs) for the specific detection of mRNA-related oligonucleotide markers in complex biological fluids...
January 27, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28709900/development-of-carbon-graphene-based-aptamer-biosensor-for-en2-protein-detection
#4
Kalpana Settu, Jen-Tsai Liu, Ching-Jung Chen, Jang-Zern Tsai
In this study, we developed a screen-printed carbon-graphene-based electrochemical biosensor for EN2 protein detection. The engrailed-2 (EN2) protein, a biomarker for prostate cancer, is known to be a strong binder to a specific DNA sequence (5'-TAATTA-3') to regulate transcription. To take advantage of this intrinsic property, aptamer probes with TAATTA sequence was immobilized onto the screen-printed carbon-graphene electrode surface via EDC-NHS coupling approach. Cyclic voltammetry (CV) of the electrochemical measurement technique was employed for the quantitative detection of EN2 protein...
July 11, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/28704918/anticancer-activity-of-graphene-oxide-reduced-graphene-oxide-silver-nanoparticle-composites
#5
Thangavel Kavinkumar, Krishnamoorthy Varunkumar, Vilwanathan Ravikumar, Sellaperumal Manivannan
In the present study, a chemical route was employed to synthesize graphene oxide (GO)-reduced graphene oxide (rGO)-Ag nanoparticle (AgNP) composites from graphite and AgNO3 using vitamin C as reducing agent. Powder X-ray diffraction pattern and field emission scanning electron microscope images revealed that the AgNP were uniformly distributed on the surface of GO and rGO nanosheets. For the first time, the cytotoxicity of GO, rGO, AgNP, GO-AgNP and rGO-AgNP composites were examined against human lung cancer A549 cells using MTT assay and reported quantitatively...
July 4, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28701748/gold-nanoparticles-dotted-reduction-graphene-oxide-nanocomposite-based-electrochemical-aptasensor-for-selective-rapid-sensitive-and-congener-specific-pcb77-detection
#6
Lidong Wu, Xianbo Lu, Xiaochen Fu, Lingxia Wu, Huan Liu
Gold nanoparticles (AuNP) dotted reduction graphene oxide (RGO-AuNP) is used as a platform for an aptamer biosensor to selectively detect 3,3'4,4'-polychlorinated biphenyls (PCB77). By anchoring aptamers onto the binding sites of RGO-AuNP and making use of the synergy effect of RGO and AuNP, the RGO-AuNP based biosensor exhibits superior analytical performances to AuNP based biosensor in terms of sensitivity and repeatability. The sensitivity of RGO-AuNP based aptamers (RGO-AuNP-Ap) biosensor (226.8 μA cm(-2)) is nearly two times higher than that of Au based biosensors (AuNP-Ap/Au electrode, 147...
July 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28681663/graphene-oxide-methylene-blue-nanocomposite-in-photodynamic-therapy-of-human-breast-cancer
#7
Reza Hosseinzadeh, Khatereh Khorsandi, Ghader Hosseinzadeh
The interaction of methylene blue (MB) as a photosensitizer with graphene oxide nano-sheets (GO) was examined in aqueous solution using UV-vis spectrophotometric techniques. MB-GO composites were prepared by mixing the solutions of GO nano-sheets and methylene blue due to interacting of the cationic methylene blue photosensitizer via electrostatic and π-π stacking or hydrophobic cooperative interactions. The cell killing potential of nanocomposite was examined on the MDA-MB-231 breast cancer cells in the absence and presence of red LED irradiation...
July 6, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/28672780/recent-progress-in-nanomaterial-based-electrochemical-biosensors-for-cancer-biomarkers-a-review
#8
REVIEW
Baozhen Wang, Uichi Akiba, Jun-Ichi Anzai
This article reviews recent progress in the development of nanomaterial-based electrochemical biosensors for cancer biomarkers. Because of their high electrical conductivity, high affinity to biomolecules, and high surface area-to-weight ratios, nanomaterials, including metal nanoparticles, carbon nanotubes, and graphene, have been used for fabricating electrochemical biosensors. Electrodes are often coated with nanomaterials to increase the effective surface area of the electrodes and immobilize a large number of biomolecules such as enzymes and antibodies...
June 24, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28662392/mc3t3-e1-pre-osteoblast-response-and-differentiation-after-graphene-oxide-nanosheet-uptake
#9
Mónica Cicuéndez, Virgília S Silva, María J Hortigüela, M Concepción Matesanz, Mercedes Vila, M Teresa Portolés
Nano-graphene oxide (GO) and its functionalized derivatives have aroused a great interest for drug delivery, tissue engineering and photothermal cancer therapy, but their biocompatibility has not yet been fully assessed. The aim of the present study was to evaluate the proliferation and differentiation of MC3T3-E1 pre-osteoblasts after the uptake of GO nanosheets (c.a. 400nm), functionalized with poly(ethylene glycol-amine) (PEG) and labelled with fluorescein isothiocyanate (FITC). Significant proliferation decrease and apoptosis increase were observed 3days after incorporation of FITC-PEG-GO by MC3T3-E1 cells...
June 20, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28656906/polydopamine-functionalized-nanographene-oxide-a-versatile-nanocarrier-for-chemotherapy-and-photothermal-therapy
#10
Xinyuan Zhang, Xu Nan, Wei Shi, Yanan Sun, Huiling Su, Yuan He, Xin Liu, Zhong Zhang, Dongtao Ge
For releasing both drug and heat to selected sites, a combination of chemotherapy and photothermal therapy in one system is a more effective way to destroy cancer cells than monotherapy. Graphene oxide (GO) with high drug-loading efficiency and near-infrared (NIR) absorbance has great potential in drug delivery and photothermal therapy, but it is difficult to load drugs with high solubility. Herein, we develop a versatile drug delivery nanoplatform based on GO for integrated chemotherapy and photothermal therapy by a facile method of simultaneous reduction and surface functionalization of GO with poly(dopamine) (PDA)...
June 28, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28643511/exceptionally-high-payload-of-the-ir780-iodide-on-folic-acid-functionalized-graphene-quantum-dots-for-targeted-photothermal-therapy
#11
Shuhua Li, Shixin Zhou, Yunchao Li, Xiaohong Li, Jia Zhu, Louzhen Fan, Shihe Yang
The IR780 iodide (IR780) is recognized as an effective theranostic agent for simultaneous near-infrared fluorescence imaging and photothermal therapy (PTT). However, the rigid chloro-cyclohexenyl ring makes IR780 insoluble in almost all pharmaceutically acceptable solvents, which inevitably limits its clinical application. We report folic acid (FA)-functionalized graphene quantum dots (GQDs-FA) containing a large and intact sp(2) domain with carboxyl groups around the edge. Such GQDs-FA possess exceptionally high loading capacity for IR780 via strong π-π stacking interactions, and the water solubility of IR780 is improved by over 2400-fold after loading onto GQDs-FA (IR780/GQDs-FA)...
July 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28640986/antimonene-quantum-dots-synthesis-and-application-as-near-infrared-photothermal-agents-for-effective-cancer-therapy
#12
Wei Tao, Xiaoyuan Ji, Xiaoding Xu, Mohammad Ariful Islam, Zhongjun Li, Si Chen, Phei Er Saw, Han Zhang, Zameer Bharwani, Zilei Guo, Jinjun Shi, Omid Farokhzad
Photothermal therapy (PTT) has shown significant potential for cancer therapy. However, developing nanomaterials (NMs)-based photothermal agents (PTAs) with satisfactory photothermal conversion efficacy (PTCE) and biocompatibility remains a key challenge. Herein, a new generation of PTAs based on two-dimensional (2D) antimonene quantum dots (AMQDs) was developed by a novel liquid exfoliation method. Surface modification of AMQDs with polyethylene glycol (PEG) significantly enhanced both biocompatibility and stability in physiological medium...
June 22, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28636312/combining-protein-and-mirna-quantification-for-bladder-cancer-analysis
#13
Ruixue Duan, Zhenyu Zhang, Fuxin Zheng, Longwang Wang, Ju Guo, Tianchi Zhang, Xiaomeng Dai, Shengwei Zhang, Dong Yang, Renrui Kuang, Gongxian Wang, Chaohong He, Abdul Hakeem, Chang Shu, Ping Yin, Xiaoding Lou, Fuqing Zeng, Huageng Liang, Fan Xia
We combine the telomerase extension reaction and microRNA (miRNA)-induced rolling circle amplification, followed by graphene oxide (GO) and nicking enzyme-assisted signal amplification as a method to analyze telomerase and miRNA-21 in urine samples with the following merits. First, it is a binary assay and can simultaneously output double signals that correspond to the quantities of telomerase and miRNA, respectively. Second, telomerase activity is enhanced by using a DNA molecular beacon probe to inhibit the formation of G-quadruplex...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28635254/sudoku-like-lab-on-paper-cyto-device-with-dual-enhancement-of-electrochemiluminescence-intermediates-strategy
#14
Hongmei Yang, Yan Zhang, Li Li, Lina Zhang, Feifei Lan, Jinghua Yu
This paper describes the design and construction of a sudoku-like lab-on-paper platform, in which dual enhancement of reaction intermediates strategy was incorporated for multiplexed competitive electrochemiluminescence (ECL) cyto-assay. Benefiting from the sudoku-like structure, integrated multifunctions were obtained on such an elaborately devised platform, including specific reagents storage, multiple samples immobilization, residual automatic washing, and signal collection. By utilizing semicarbazide (SE) and silver nanoparticles (AgNPs) as dual enhancers, more ECL intermediates could be obtained in the graphene quantum dots (GQDs) and peroxydisulfate system, resulting in the production of more excited-state GQDs to emit light...
July 5, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28632263/fabrication-of-a-graphene-c60-nanohybrid-via-%C3%AE-cyclodextrin-host-guest-chemistry-for-photodynamic-and-photothermal-therapy
#15
Zhen Hu, Cheng Wang, Feng Zhao, Xirong Xu, Shuhong Wang, Long Yu, Dayu Zhang, Yudong Huang
The wonderful chemical structures and characteristics of low-dimensional carbon materials have exciting applications in life sciences. In the present study, we developed a facile strategy to conjugate C60 with graphene via host-guest chemistry for targeted phototherapy. A versatile carrier based on folic acid-functionalized graphene (GO-FA) and comprising γ-cyclodextrin (γ-CD) at its surface was assembled via π-π interaction, creating hybrid structures with drug storage and tumor targeting properties. This γ-CD-modified graphene (GO-FA/Py-γ-CD) is capable of hosting pristine C60 molecules for the fabrication of a GO-FA/Py-γ-CD/C60 nanohybrid...
June 29, 2017: Nanoscale
https://www.readbyqxmd.com/read/28629019/methotrexate-loaded-nitrogen-doped-graphene-quantum-dots-nanocarriers-as-an-efficient-anticancer-drug-delivery-system
#16
Fatemeh Khodadadei, Shahrokh Safarian, Narges Ghanbari
Graphene quantum dots (GQDs) are new efficient nanomaterials used in therapeutic applications. In this study, blue fluorescent nitrogen-doped GQDs (N-GQDs) were synthesized by a hydrothermal method via pyrolisis of citric acid as the carbon source and urea as the nitrogen source. The existence of doped nitrogen in GQDs was confirmed by FTIR characterization. Here, for the first time, the N-GQDs were loaded with the anticancer drug, methotrexate (MTX), to prepare MTX-(N-GQDs) as an efficient drug delivery system...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629006/a-colon-targeted-drug-delivery-system-based-on-alginate-modificated-graphene-oxide-for-colorectal-liver-metastasis
#17
Bin Zhang, Yayuan Yan, Qiujuan Shen, Dong Ma, Langhuan Huang, Xiang Cai, Shaozao Tan
A major problem associated with colon cancer is liver metastasis. A colon-targeted drug delivery system is one way to address this problem after the resection of colorectal cancer. However, traditional drug delivery systems face many challenges, such as an inability to control the release rate, inaccurate targeting, susceptibility to the microenvironment and poor stability. Here, we report the development of a graphene oxide (GO)-based, sodium alginate (ALG) functionalized colon-targeting drug delivery system, that is loaded with 5-fluorouracil (5-FU) as the anti-cancer drug (denoted as GO-ALG/5-FU)...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28624669/neutron-activatable-radionuclide-cancer-therapy-using-graphene-oxide-nanoplatelets
#18
Junghyun Kim, Michael Jay
Neutron-activation is a promising method of generating radiotherapeutics with minimal handling of radioactive materials. Graphene oxide nanoplatelets (GONs) were examined as a carrier for neutron-activatable holmium with the purpose of exploiting inherent characteristics for theranostic application. GONs were hypothesized to be an ideal candidate for this application owing to their desirable characteristics such as a rigid structure, high metal loading capacity, low density, heat resistance, and the ability to withstand harsh environments associated with the neutron-activation process...
September 2017: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/28614069/pegylated-lipid-bilayer-wrapped-nano-graphene-oxides-for-synergistic-co-delivery-of-doxorubicin-and-rapamycin-to-prevent-drug-resistance-in-cancers
#19
Raj Kumar Thapa, Jeong Hoon Byeon, Han-Gon Choi, Chul Soon Yong, Jong Oh Kim
Nano-graphene oxide (nGO) is a carbon allotrope studied for its potential as carrier for chemotherapeutic delivery and its photoablation effects. However, interaction of nGO with blood components and the subsequent toxicities warrant a hybrid system for effective cancer drug delivery. Combination chemotherapy aids in effective cancer treatment and prevention of drug resistance. Therefore, in this study, we attempted to prepare polyethylene glycosylated (PEGylated) lipid bilayer-wrapped nGO co-loaded with doxorubicin (DOX) and rapamycin (RAPA), GOLDR, for the prevention and treatment of resistant cancers...
June 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28575975/biosynthesis-of-reduced-graphene-oxide-and-its-in-vitro-cytotoxicity-against-cervical-cancer-hela-cell-lines
#20
Lan Luo, Lina Xu, Haibo Zhao
The present work proposed a simple, one pot, and green approach for the deoxygenation of graphene oxide (GO) using pyrogallol as reducing and stabilizing agent. This synthetic strategy prevents the utilization of toxic reducing reagents during synthesis. The characterization results of Ultra violet visible (UV-Vis), X-ray diffraction (XRD), X-ray photo electron spectroscopy (XPS), Transmission electron microscopy (TEM) for the synthesized GO and reduced graphene oxide (RGO) indicated the strong removal of oxygen groups after reduction which followed by stabilization with oxidized form of pyrogallol...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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