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Graphene biocompatibility

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https://www.readbyqxmd.com/read/27920430/biomimetic-antimicrobial-cloak-by-graphene-oxide-agar-hydrogel
#1
Massimiliano Papi, Valentina Palmieri, Francesca Bugli, Marco De Spirito, Maurizio Sanguinetti, Carlotta Ciancico, Maria Chiara Braidotti, Silvia Gentilini, Luca Angelani, Claudio Conti
Antibacterial surfaces have an enormous economic and social impact on the worldwide technological fight against diseases. However, bacteria develop resistance and coatings are often not uniform and not stable in time. The challenge is finding an antibacterial coating that is biocompatible, cost-effective, not toxic, and spreadable over large and irregular surfaces. Here we demonstrate an antibacterial cloak by laser printing of graphene oxide hydrogels mimicking the Cancer Pagurus carapace. We observe up to 90% reduction of bacteria cells...
December 2016: Scientific Reports
https://www.readbyqxmd.com/read/27914332/amyloid-graphene-oxide-as-immobilization-platform-of-au-nanocatalysts-and-enzymes-for-improved-glucose-sensing-activity
#2
Xiaochen Wu, Mingjie Li, Zehui Li, Lili Lv, Yan Zhang, Chaoxu Li
Two-dimensional GO nanosheets and one-dimensional lysozyme nanofibrils were hybridized through electrostatic interaction to get a novel amyloid-GO composite, which promised a biocompatible immobilization platform for Au nanocatalysts as well as enzymes. The immobilization platform could load a large and tunable amount of Au NPs while maintaining their high catalytic activity. The immobilized catalysts showed high electrochemical behaviors, being ideal as glucose sensing systems. Furthermore, enzymes could also be immobilized on the residual bare surfaces of amyloid-GO, and served by a colorimetric method for a sensitive and selective analytical glucose-detecting platform...
November 16, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27876839/antibacterial-ability-and-hemocompatibility-of-graphene-functionalized-germanium
#3
Hao Geng, Jiayun Dai, Jinhua Li, Zengfeng Di, Xuanyong Liu
Germanium (Ge), as an elemental semiconductor material, has been an attractive candidate for manufacturing semiconductor microelectronic device. In the present investigation, to improve the biocompatibility of Ge-based device, graphene film is directly deposited on the Ge surface with different coverage area by controlling the growth time. Compared to bare Ge, the presence of graphene film entitles Ge with satisfactory antibacterial ability against Staphylococcus aureus (S.aureus), and acceptable antibacterial ability against Escherichia coli (E...
November 23, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27875978/near-infrared-light-responsive-polymeric-nanocomposites-for-cancer-therapy
#4
Cong Min, Xueqing Zou, Quanzhu Yang, Liqiong Liao, Guofu Zhou, Lijian Liu
Inorganic nanoparticles, which can absorb and convert near infrared (NIR) light to heat to ablate cancer cells, have been widely investigated in photothermal therapy. However, the inherent poor solubility and acute systemic toxicity of these inorganic particles hinder their application in clinical practice. Polymeric nnanocomposites materials containing both inorganic nanoparticles and polymers could be harnessed to achieve enhanced photothermal therapeutic effect as well as improved biocompatibility and multi-responsiveness...
November 22, 2016: Current Topics in Medicinal Chemistry
https://www.readbyqxmd.com/read/27871047/a-novel-label-free-electrochemical-immunosensor-based-on-functionalized-nitrogen-doped-graphene-quantum-dots-for-carcinoembryonic-antigen-detection
#5
Yuying Yang, Qing Liu, Yan Liu, Jianjian Cui, Hui Liu, Ping Wang, Yueyun Li, Lei Chen, Zengdian Zhao, Yunhui Dong
A novel and ultrasensitive label-free electrochemical immunosensor was fabricated for quantitative detection of carcino-embryonic antigen (CEA). The nitrogen-doped graphene quantum dots (N-GQDs) supported PtPd bimetallic nanoparticles (PtPd/N-GQDs) were synthesized by a simple and green hydrothermal procedure. Subsequently, PtPd/N-GQDs functionalized Au nanoparticles (PtPd/N-GQDs@Au) were prepared successfully via a self-assembly approach. Because of the synergetic effect present in PtPd/N-GQDs@Au, this novel nanocomposites has shown excellent electrocatalytic activity towards hydrogen peroxide (H2O2) reduction...
November 15, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27867108/poly-3-4-ethylenedioxythiophene-graphene-oxide-composite-coatings-for-controlling-magnesium-implant-corrosion
#6
Kasey Catt, Huaxiu Li, X Tracy Cui
: Magnesium (Mg) is a promising biodegradable implant material because of its appropriate mechanical properties and safe degradation products. However, in vivo corrosion speed and hydrogen gas production need to be controlled for uses in biomedical applications. Here we report the development of a conducting polymer 3,4-ethylenedioxythiphene (PEDOT) and graphene oxide (GO) composite coating as a corrosion control layer. PEDOT/GO was electropolymerized on Mg samples in ethanol media. The coated Mg samples were subjected to various corrosion tests...
November 17, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27845169/graphene-oxide-quantum-dots-disrupt-autophagic-flux-by-inhibiting-lysosome-activity-in-gc-2-and-tm4-cell-lines
#7
Xiaoli Ji, Bo Xu, Mengmeng Yao, Zhilei Mao, Yuqing Zhang, Guofeng Xu, Qiusha Tang, Xinru Wang, Yankai Xia
Graphene oxide quantum dots (GOQDs) have broad application prospects in many areas including bioimaging, drug delivery, DNA cleavage system, sensors and photocatalyst. Recently, increasing concerns have been raised about their biocompatibility, but studies about the effects of GOQDs on male reproductive system are still lacking. In this work, we explored the effects and molecular mechanisms of GOQDs on GC-2 and TM4 cells. We found autophagosome accumulation in GC-2 and TM4 cells after GOQDs treatment. Both LC3-II/LC3-I ratio and p62 levels increased, and the chloroquine-induced accumulation of LC3-II didn't enhance in the presence of GOQDs, which indicated that GOQDs blocked autophagic flux...
November 12, 2016: Toxicology
https://www.readbyqxmd.com/read/27825875/molecularly-imprinted-electrochemical-sensor-based-on-bioinspired-au-microflowers-for-ultra-trace-cholesterol-assay
#8
Hua Yang, Li Li, Yaping Ding, Daixin Ye, Yingzi Wang, Shiqiang Cui, Lanfeng Liao
A novel imprinted sensor for ultra-trace cholesterol (CHO) detection based on electropolymerized aminothiophenol (ATP) molecularly imprinted polymer (MIP) on a glassy carbon electrode (GCE) modified with dopamine@graphene (DGr) and bioinspired Au microflowers has been developed in this work. As the specific recognition element, the bioinspired Au microflowers were formed by Au nanoparticles (AuNPs) and wrapped by bionic polydopamine film (PDA) through electropolymerization method. These excellent biocompatible materials could capture the target CHO effectively...
September 28, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27818044/functionalized-nanocomposites-with-the-optimal-graphene-oxide-au-ratio-for-amplified-immunoassay-of-e-coli-to-estimate-quality-deterioration-in-dairy-product
#9
Xinai Zhang, Yuxiang Jiang, Chenyong Huang, Jianzhong Shen, Xiaoya Dong, Guangwei Chen, Wen Zhang
An amplified electrochemical immunosensor was developed by exploiting poly(diallyldimethylammonium chloride)-functionalized graphene oxide and gold nanoparticles (GO-PDDA@AuNP) as sensing platform. Highlight of this work was to investigate and optimize the ratio of GO-PDDA to AuNP for sensitivity enhancement. The suitable GO-PDDA@AuNP nanocomposites were proven to not only provide an excellent biocompatible microenvironment for the immobilized antibody, but also accelerate electron transfer to enhance electrochemical signal...
September 28, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27816581/amplified-fluorescent-sensing-of-dna-using-luminescent-carbon-dots-and-aunps-go-as-a-sensing-platform-a-novel-coupling-of-fret-and-dna-hybridization-for-homogeneous-hiv-1-gene-detection-at-femtomolar-level
#10
Somaye Hamd Qaddare, Abdollah Salimi
The demand for simple, sensitive, affordable, and selective DNA biosensors is willing, due to the important role of DNA detection in the areas of disease diagnostics, environment monitoring and food safety. The presented work is devoted to the fabrication of an ultrasensitive homogeneous biosensor for the detection of DNA sequences related to HIV based on fluorescence resonance energy transfer(FRET) between carbon dots(CDs) and AuNPs as nanoquenchers. CDs as fluorophore with average size 3-4nm were prepared by hydrothermal treatment of histidine...
October 19, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27812594/probing-electrical-signals-in-the-retina-via-graphene-integrated-microfluidic-platforms
#11
Yuchen Zhang, Kirsten H Dodson, Rachel Fischer, Rui Wang, Deyu Li, Rebecca M Sappington, Ya-Qiong Xu
Graphene has attracted extensive attention in biological and biomedical fields due to its unique physical properties and excellent biocompatibility. We combine graphene field-effect transistors and scanning photocurrent microscopy with microfluidic platforms to investigate electrical signals in mouse retina. Remarkable photocurrent signals were detected from the graphene underneath the optic nerve head (ONH) of the retina, where the electrical activity from this region can modulate the carrier concentration of the graphene and induce local potential gradients...
December 7, 2016: Nanoscale
https://www.readbyqxmd.com/read/27809270/flexible-graphene-electrodes-for-prolonged-dynamic-ecg-monitoring
#12
Cunguang Lou, Ruikai Li, Zhaopeng Li, Tie Liang, Zihui Wei, Mingtao Run, Xiaobing Yan, Xiuling Liu
This paper describes the development of a graphene-based dry flexible electrocardiography (ECG) electrode and a portable wireless ECG measurement system. First, graphene films on polyethylene terephthalate (PET) substrates and graphene paper were used to construct the ECG electrode. Then, a graphene textile was synthesized for the fabrication of a wearable ECG monitoring system. The structure and the electrical properties of the graphene electrodes were evaluated using Raman spectroscopy, scanning electron microscopy (SEM), and alternating current impedance spectroscopy...
November 1, 2016: Sensors
https://www.readbyqxmd.com/read/27799770/graphene-single-walled-carbon-nanotube-hybrids-promoting-osteogenic-differentiation-of-mesenchymal-stem-cells-by-activating-p38-signaling-pathway
#13
Xinxin Yan, Wen Yang, Zengwu Shao, Shuhua Yang, Xianzhe Liu
Carbon nanomaterials are becoming increasingly significant in biomedical fields since they exhibit exceptional physicochemical and biocompatible properties. Today, the stem cells offer potentially new therapeutic approaches in tissue engineering and regenerative medicine. However, the induction of differentiation into specific lineages remains challenging, which provoked us to explore the biomedical applications of carbon nanomaterials in stem cells. In this study, we investigated the interactions between graphene/single-walled carbon nanotube (G/SWCNT) hybrids and rat mesenchymal stem cells (rMSCs) and focused on the proliferation and differentiation of rMSCs treated with G/SWCNT hybrids...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27799056/toxicity-of-graphene-family-nanoparticles-a-general-review-of-the-origins-and-mechanisms
#14
REVIEW
Lingling Ou, Bin Song, Huimin Liang, Jia Liu, Xiaoli Feng, Bin Deng, Ting Sun, Longquan Shao
Due to their unique physicochemical properties, graphene-family nanomaterials (GFNs) are widely used in many fields, especially in biomedical applications. Currently, many studies have investigated the biocompatibility and toxicity of GFNs in vivo and in intro. Generally, GFNs may exert different degrees of toxicity in animals or cell models by following with different administration routes and penetrating through physiological barriers, subsequently being distributed in tissues or located in cells, eventually being excreted out of the bodies...
October 31, 2016: Particle and Fibre Toxicology
https://www.readbyqxmd.com/read/27795570/flexible-bottom-gate-graphene-transistors-on-parylene-c-substrate-and-the-effect-of-current-annealing
#15
Dong-Wook Park, Hyungsoo Kim, Jihye Bong, Solomon Mikael, Tong June Kim, Justin C Williams, Zhenqiang Ma
Flexible graphene transistors built on a biocompatible Parylene C substrate would enable active circuitry to be integrated into flexible implantable biomedical devices. An annealing method to improve the performance of a flexible transistor without damaging the flexible substrate is also desirable. Here, we present a fabrication method of a flexible graphene transistor with a bottom-gate coplanar structure on a Parylene C substrate. Also, a current annealing method and its effect on the device performance have been studied...
October 10, 2016: Applied Physics Letters
https://www.readbyqxmd.com/read/27778152/date-fruits-assisted-synthesis-and-biocompatibility-assessment-of-nickel-oxide-nanoparticles-anchored-onto-graphene-sheets-for-biomedical-applications
#16
Ali A Alshatwi, Jegan Athinarayanan, Vaiyapuri Subbarayan Periasamy, Khalid A Alatiah
Nanographene- and graphene-based nanohybrids have garnered attention in the biomedical community owing to their biocompatibility, excellent aqueous processability, ease of cellular uptake, facile surface functionalization, and thermal and electrical conductivities. NiO nanoparticle-graphene nanohybrid (G-NiO) was synthesized by first depositing Ni(OH)2 onto the surface of graphene oxide (GO) sheets. The Ni(OH)2-GO hybrids were then reduced to G-NiO using date palm syrup at 85 °C. The prepared G-NiO nanohybrids were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy, and energy-dispersive X-ray spectroscopy (EDX)...
October 24, 2016: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/27773313/ultrasound-assisted-simultaneous-reduction-and-direct-functionalization-of-graphene-oxide-with-thermal-and-cytotoxicity-profile
#17
Shrikant S Maktedar, Gopal Avashthi, Man Singh
The new sonochemical approach for simultaneous reduction and direct functionalization of graphene oxide (GrO) has been developed. The GrO was functionalized with 2-Aminobenzoxazole (2-ABOZ) in twenty min with complete deletion of hazardous steps. The significance of ultrasound was exemplified with the comparative conventional methods. The newly prepared f-(2-ABOZ)GrO was extensively characterized with near edge X-ray absorption fine structure (NEXAFS) spectroscopy, (13)C solid state NMR, XPS, XRD, HRTEM, SAED, AFM, Raman, UV-vis, FTIR and TGA...
January 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/27773294/in-situ-sonochemical-reduction-and-direct-functionalization-of-graphene-oxide-a-robust-approach-with-thermal-and-biomedical-applications
#18
Shrikant S Maktedar, Shantilal S Mehetre, Gopal Avashthi, Man Singh
The rapid, robust, scalable and non-hazardous sonochemical approach for in situ reduction and direct functionalization of graphene oxide has been developed for non-toxic biomedical applications. The graphene oxide (GrO) was directly functionalized with tryptamine (TA) without using any hazardous acylating and coupling reagents. The reaction was completed within 20min. An impact of ultrasound was inferred for a direct functionalization with other conventional methods. The evolved electronic states were confirmed with near edge X-ray absorption fine structure (NEXAFS)...
January 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/27770930/a-polyamidoamne-dendrimer-functionalized-graphene-oxide-for-dox-and-mmp-9-shrna-plasmid-co-delivery
#19
Yaming Gu, Yizhen Guo, Changyong Wang, Jiake Xu, Jianping Wu, Thomas Brett Kirk, Dong Ma, Wei Xue
It is a promising way to treat the multi drug resistance (MDR) of tumor cells in both of drug and gene methods. A polyamidoamne dendrimer functionalized graphene oxide (GO-PAMAM) was designed, which could load doxorubicin (DOX) and MMP-9 shRNA plasmid at the same time in order to achieve effective treatment to breast cancer. GO-PAMAM has a high loading capacity to DOX and pH-controlled DOX release. Besides, it has efficient gene transfer ability, the transfection efficiency is significantly better than PEI-25k in the presence of serum, and it can significantly inhibit the expression of MMP-9 protein in MCF-7 cells...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27770871/on-the-biological-performance-of-graphene-oxide-modified-chitosan-polyvinyl-pyrrolidone-nanocomposite-membranes-in-vitro-and-in-vivo-effects-of-graphene-oxide
#20
Nafiseh Mahmoudi, Abdolreza Simchi
Nanofibrous structures that mimic the native extracellular matrix and promote cell adhesion have attracted considerable interest for biomedical applications. In this study, GO-modified nanofibrous biopolymers (GO) were prepared by electrospinning blended solutions of chitosan (80vol%), polyvinyl pyrrolidone (15vol%), polyethylene oxide (5vol%) containing GO nanosheets (0-2wt%). It is shown that GO nanosheets significantly change the conductivity and viscosity of highly concentrated chitosan solutions, so that ultrafine and uniform fibers with an average diameter of 60nm are spinnable...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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