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https://www.readbyqxmd.com/read/29775856/a-simple-ultrasensitive-electrochemical-sensor-for-simultaneous-determination-of-gallic-acid-and-uric-acid-in-human-urine-and-fruit-juices-based-on-zirconia-choline-chloride-gold-nanoparticles-modified-carbon-paste-electrode
#1
Seyed Alireza Shahamirifard, Mehrorang Ghaedi, Zahra Razmi, Shaaker Hajati
The determination of gallic acid (GA) and uric acid (UA) is essential due to their biological properties. Numerous methods have been reported for the analysis of GA and UA in various real samples. However, the development of a simple, rapid and practical sensor still remains a great challenge. Here, a carbon paste electrode (CPE) was modified by nanocomposite containing zirconia nanoparticles (ZrO2 NPs), Choline chloride (ChCl) and gold nanoparticles (AuNPs) to construct ZrO2 -ChCl-AuNPs/CPE as electrochemical sensor for the simultaneous electro-oxidation of GA and UA...
May 8, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29775854/a-wavelength-modulated-localized-surface-plasmon-resonance-lspr-optical-fiber-sensor-for-sensitive-detection-of-mercury-ii-ion-by-gold-nanoparticles-dna-conjugates
#2
Shuo Jia, Chao Bian, Jizhou Sun, Jianhua Tong, Shanhong Xia
The study presented herein investigated an easy preparation, high performance, wavelength-modulated LSPR optical fiber chemosensor coated by gold nanospheres(AuNS) for Hg2+ detection based on thymine-Hg2+ -thymine base pair mismatches and the coupled plasmonic resonance effect.Utilizing electrostatic self-assembly method, the high density and dispersivity monolayer AuNS coated LSPR fiber sensor had the near field refractive index sensitivity up to 2016 nm/RIU. The single-strand probe DNA served as a binding element for free AuNS labelled-target DNA conjugates was attached to the monolayer AuNS by Au-S bond...
May 8, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29775052/double-photosystems-based-z-scheme-photoelectrochemical-sensing-mode-for-ultrasensitive-detection-of-disease-biomarker-accompanying-3d-dna-walker
#3
Shuzhen Lv, Kangyao Zhang, Yongyi Zeng, Dianping Tang
A new double photosystems-based 'Z-scheme' photoelectrochemical (PEC) sensing platform is designed for ultrasensitive detection of prostate-specific antigen (PSA) by coupling with three-dimensional (3D) DNA walker. Two photosystems consist of CdS quantum dots (photosystem I; PS I) and BiVO4 photoactive materials (photosystem II; PS II), whereas gold nanoparticles (AuNPs) photodeposited on high-active {010} facets of BiVO4 are used as the electron mediators to promote electron transfer from conduction band (CB) of PS II to valence band (VB) of PS I...
May 18, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29775044/effect-of-hydrophobicity-on-nano-bio-interactions-of-zwitterionic-luminescent-gold-nanoparticles-at-the-cellular-level
#4
Shasha Sun, Yingyu Huang, Chen Zhou, Sishan Chen, Mengxiao Yu, Jinbin Liu, Jie Zheng
Fundamental understanding of how the hydrophobicity impacts cellular interactions of engineered nanoparticles is critical to their future success in healthcare. Herein, we report that inserting hydrophobic octanethiol onto the surface of zwitterionic luminescent glutathione coated gold nanoparticles (GS-AuNPs) of 2 nm enhanced their affinity to the cellular membrane and increased cellular uptake kinetics by more than one order of magnitude, rather than inducing the accumulation of the AuNPs in the bilayer core or enhancing their passive diffusion...
May 18, 2018: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29774971/3d-dna-origami-crystals
#5
Tao Zhang, Caroline Hartl, Kilian Frank, Amelie Heuer-Jungemann, Stefan Fischer, Philipp C Nickels, Bert Nickel, Tim Liedl
3D crystals assembled entirely from DNA provide a route to design materials on a molecular level and to arrange guest particles in predefined lattices. This requires design schemes that provide high rigidity and sufficiently large open guest space. A DNA-origami-based "tensegrity triangle" structure that assembles into a 3D rhombohedral crystalline lattice with an open structure in which 90% of the volume is empty space is presented here. Site-specific placement of gold nanoparticles within the lattice demonstrates that these crystals are spacious enough to efficiently host 20 nm particles in a cavity size of 1...
May 18, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29774603/programmed-nanoparticle-loaded-nanoparticles-for-deep-penetrating-3d-cancer-therapy
#6
Jinhwan Kim, Changshin Jo, Won-Gwang Lim, Sungjin Jung, Yeong Mi Lee, Jun Lim, Haeshin Lee, Jinwoo Lee, Won Jong Kim
Tumors are 3D, composed of cellular agglomerations and blood vessels. Therapies involving nanoparticles utilize specific accumulations due to the leaky vascular structures. However, systemically injected nanoparticles are mostly uptaken by cells located on the surfaces of cancer tissues, lacking deep penetration into the core cancer regions. Herein, an unprecedented strategy, described as injecting "nanoparticle-loaded nanoparticles" to address the long-lasting problem is reported for effective surface-to-core drug delivery in entire 3D tumors...
May 18, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29773989/the-cytotoxic-effects-of-betulin-conjugated-gold-nanoparticles-as-stable-formulations-in-normal-and-melanoma-cells
#7
Marius Mioc, Ioana Zinuca Pavel, Roxana Ghiulai, Dorina E Coricovac, Claudia Farcaş, Ciprian-Valentin Mihali, Camelia Oprean, Vlad Serafim, Ramona A Popovici, Cristina A Dehelean, Michael I Shtilman, Aristidis M Tsatsakis, Codruţa Şoica
Gold nanoparticles are currently investigated as theranostics tools in cancer therapy due to their proper biocompatibility and increased efficacy related to the ease to customize the surface properties and to conjugate other molecules. Betulin, [lup-20(29)-ene-3β, 28-diol], is a pentacyclic triterpene that has raised scientific interest due to its antiproliferative effect on several cancer types. Herein we described the synthesis of surface modified betulin-conjugated gold nanoparticles using a slightly modified Turkevich method...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29773174/in-vivo-bio-distribution-clearance-and-toxicity-assessment-of-biogenic-silver-and-gold-nanoparticles-synthesized-from-abutilon-indicum-in-wistar-rats
#8
Rani Mata, Jayachandra Reddy Nakkala, Varshney Khub Chandra, Kumar Raja, Sudha Rani Sadras
This study reports the bio-distribution and clearance of Abutilon indicum silver and gold nanoparticles (AIAgNPs and AIAuNPs) in Wistar rats. Rats in different groups were orally administered with 5 and 10 mg/Kg BW of AIAgNPs and AIAuNPs (size 1-25 nm) for 28 days and few were maintained until 58 days of washout period. Serum biochemical parameters were not changed significantly at both doses of AIAuNPs and at lower concentration of AIAgNPs. But, with 10 mg/Kg BW of AIAgNPs rats showed elevated levels of AST, ALP and ALT on day 29, however, these levels were restored to normal after washout period...
July 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29772778/visual-and-colorimetric-sensing-of-metsulfuron-methyl-by-exploiting-hydrogen-bond-induced-anti-aggregation-of-gold-nanoparticles-in-the-presence-of-melamine
#9
Guangyang Liu, Ruonan Zhang, Xiaodong Huang, Lingyun Li, Naixin Liu, Jing Wang, Donghui Xu
Various highly sensitive and selective analytical methods have been used to monitor metsulfuron-methyl residue in the environment. However, these methods involve costly instruments and complex, time-consuming operations performed in laboratories. Here, a rapid, convenient, and sensitive colorimetric sensor based on anti-aggregation of gold nanoparticles (AuNPs) is demonstrated for the rapid detection of metsulfuron-methyl in agricultural irrigation water. The AuNPs could be induced to aggregate in the presence of melamine and exhibited a distinct color change from wine-red to blue...
May 17, 2018: Sensors
https://www.readbyqxmd.com/read/29772775/ph-responsive-mercaptoundecanoic-acid-functionalized-gold-nanoparticles-and-applications-in-catalysis
#10
Siyam M Ansar, Saptarshi Chakraborty, Christopher L Kitchens
Mercaptoundecanoic acid (MUA) functionalized gold nanoparticles (AuNP-MUA) were synthesized and demonstrated to possess pH-triggered aggregation and re-dispersion, as well as the capability of phase transfer between aqueous and organic phases in response to changes in pH. The pH of aggregation for AuNP-MUA is consistent with the pKa of MUA (pH ~4) in solution, while AuNP-MUA phase transition between aqueous and organic phases occurs at pH ~9. The ion pair formation between the amine group in octadecylamine (ODA), the carboxylate group in MUA, and the hydrophobic alkyl chain of ODA facilitates the phase transfer of AuNP-MUA into an organic medium...
May 17, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29772665/investigating-the-role-of-gold-nanoparticle-shape-and-size-in-their-toxicities-to-fungi
#11
Kangze Liu, Zhonglei He, Hugh J Byrne, James F Curtin, Furong Tian
Gold nanoparticles (GNPs) are increasingly being used in a wide range of applications, and such they are being released in greater quantities into the environment. Consequently, the environmental effects of GNPs, especially toxicities to living organisms, have drawn great attention. However, their toxicological characteristics still remain unclear. Fungi, as the decomposers of the ecosystem, interact directly with the environment and critically control the overall health of the biosphere. Thus, their sensitivity to GNP toxicity is particularly important...
May 16, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29772094/quantifying-biomolecular-binding-constants-using-video-paper-analytical-devices
#12
Benjamin S Miller, Claudio Parolo, Valerian Turbé, Candice E Keane, Eleanor R Gray, Rachel McKendry
We report a novel ultralow-cost biochemical analysis platform to quantify protein dissociation binding constants and kinetics using paper microfluidics. Our approach marries video imaging with one of humankind's oldest materials - paper, requiring no large, expensive laboratory equipment, complex microfluidics or external power. Temporal measurements of nanoparticle-antibody conjugates binding on paper is found to follow the Langmuir Adsorption Model. This is exploited to measure a series of antibody-antigen dissociation constants on paper, showing excellent agreement with a gold-standard benchtop interferometer...
May 17, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29770826/the-size-selective-interaction-of-key-and-lock-nanocrystals-driven-by-depletion-attraction-at-the-nanoscale
#13
D Hinrichs, R Himstedt, D Dorfs
In this article, we study the size-dependent interactions of quasi-spherical nanocrystals with voids of concave nanoparticles of complementary sizes and shapes. Experimental insights into a system with key and lock particles with smaller dimensions than 15 nm are presented, which provide evidence for key-lock specific interaction on this length scale. Using depletion attraction as a driving force, the key-lock interaction is shown to be reversible and independent of the material composition of the key particles...
May 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29768892/green-synthesis-characterization-and-catalytic-activity-of-gold-nanoparticles-prepared-using-rosmarinic-acid
#14
Soo Hyeon Lim, Youmie Park
Green strategies to synthesize gold nanoparticles have attracted a substantial amount of attention because global sustainability is a focal issue in many research areas. In the present study, rosmarinic acid was utilized as a reducing agent to reduce gold ions to gold nanoparticles. The characteristic surface plasmon resonance of gold nanoparticles was observed at 532 nm with a pink-colored colloidal solution. High-resolution transmission electron microscopy (HR-TEM) revealed the presence of spherical nanoparticles along with triangular nanoplates...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29768883/a-simple-%C3%AE-ketoglutarate-electrochemical-biosensor-based-on-reduced-mos%C3%A2-nanoparticle-gold-nanoparticle-nanocomposite
#15
Yadong Yu, Na Wu, Gang Peng, Tao Li, Ling Jiang, He Huang
Convenient and sensitive methods for the detection of α-ketoglutarate (α-KG) will be beneficial for biomedical diagnosis and microbial fermentation industry. In this work, reduced MoS2 nanoparticles (rMNs) were prepared by ultrasonication and electrochemical reduction. The rMNs were then decorated with gold nanoparticles (Aunano) to fabricate rMNs-Aunano nanocomposite. The glass carbon electrode modified with rMNs-Aunano nanocomposite (rMNs-Aunano-GCE) showed excellent electro-catalytic oxidation toward NADH with a satisfied reproducibility and exhibited linear response in the range of 38...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29768812/sensitive-detection-of-rifampicin-based-on-au-carbon-nanocomposite
#16
Ruimin Xing, Xiaoyu Zhao, Yanli Xu, Haitang Yang, Zhixian Chang, Jianying Qu, Xiuhua Liu, Jing-He Yang, Shanhu Liu
Gold nanoparticles-supported Cabot Vulcan XC72R (Au/VXC72R) nanocomposite was synthesized by chemical reduction of gold (III) chloride with VXC72R. A novel electrochemical sensor based on the Au/VXC72R nanocomposite has been fabricated for the sensitive detection of rifampicin (RIF). Field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray powder diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS) were used to characterize the morphology, structure and compositions of the nanocomposite...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29768243/corrigendum-synthesis-of-extracellular-gold-nanoparticles-using-cupriavidus-metallidurans-ch34-cells
#17
(no author information available yet)
No abstract text is available yet for this article.
June 2018: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29768241/effects-of-fe-sds-and-au-nanoparticles-on-p-aeruginosa-bacterial-growth-and-biosurfactant-production
#18
Neda Alamdar, Behnam Rasekh, Fatemeh Yazdian
The aim of this study was to evaluate the effects of iron (Fe)/SDS and gold (Au) nanoparticles on growth and biosurfactant production of Pseudomonas aeruginosa PBCC5 . The concentrations of the nanoparticles used were 1, 500 and 1000 mg/l. In this research, the surface tension of biosurfactant, dry weight of biosurfactant and biomass, emulsification indexes (E24 ) were measured and transmission electron microscopy analysis was used to monitor the nanoparticles. The test results showed that the effect of nanoparticles on the bacterial growth and biosurfactant production varied corresponding to the type and concentration of nanoparticles...
June 2018: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29768239/antibacterial-and-catalytic-activity-of-biogenic-gold-nanoparticles-synthesised-by-trichoderma-harzianum
#19
Ravi Mani Tripathi, Braj Raj Shrivastav, Archana Shrivastav
This study reveals the antibacterial and catalytic activity of biogenic gold nanoparicles (AuNPs) synthesised by biomass of Trichoderma harzianum . The antibacterial activity of AuNPs was analysed by the means of growth curve, well diffusion and colony forming unit (CFU) count methods. The minimum inhibitory concentration of AuNPs was 20 µg/ml. AuNPs at 60 µg/ml show effective antibacterial activity as optical absorption was insignificant. The well diffusion and CFU methods were also applied to analyse the effect of various concentration of AuNPs...
June 2018: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29768233/biogenic-gold-nanoparticles-for-reduction-of-4-nitrophenol-to-4-aminophenol-an-eco-friendly-bioremediation
#20
Asmathunisha Nabikhan, Suji Rathinam, Kathiresan Kandasamy
The present study investigated the synthesis of gold nanoparticles (AuNPs) using mangrove plant extract from Avicennia marina as bioreductant for eco-friendly bioremediation of 4-nitrophenol (4-NP) . The AuNPs synthesised were confirmed by UV spectrum, transmission electron microscopy (TEM), X-ray diffraction, Fourier transmission infrared spectroscopy (FTIR), dynamic light scattering (DLS), and zeta potential. The AuNPs were found to be spherical in shape with size ranging from 4 to 13 nm, as evident by TEM and DLS...
June 2018: IET Nanobiotechnology
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