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https://www.readbyqxmd.com/read/28732160/color-encoded-assays-for-the-simultaneous-quantification-of-dual-cancer-biomarkers
#1
Jun Ma, Lei Zhan, Rong Sheng Li, Peng Fei Gao, Cheng Zhi Huang
For the first time, the scattering light of noble nanoparticles was applied for the simultaneous detection of dual cancer biomarkers. Two nanoprobes with dual scattering light colors were used for the simultaneous imaging of alpha-fetoprotein (AFP) and carcinoembryonic antigen (CEA) based on the sandwich-type immunoassay. Since AFP can combine anti-AFP-modified gold nanoparticles which have green scattering light under dark-field microscopic imaging (iDFM) technique while CEA can conjugate anti-CEA-immobilized silver nanoparticles which have blue scattering light, the simultaneous determination of AFP and CEA can be achieved by separately counting the number of green and blue light spots in iDFM technique...
July 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28731325/bioinspired-and-biomimetic-agnps-gentamicin-embedded-silk-fibroin-coatings-for-robust-antibacterial-and-osteogenetic-applications
#2
Wenhao Zhou, Zhaojun Jia, Pan Xiong, Jianglong Yan, Yangyang Li, Ming Li, Yan Cheng, Yufeng Zheng
With the progressively increasing demand for orthopedic Ti implants, the balance realization between two primary complications restricting implants applications is imperative needed to be solved that the lack of bone tissue integration and biomedical device-associated infections (BAI), where emergence of multi-resistance bacteria make it worse. Notably, a combination of silver nanoparticles (AgNPs) and a kind of antibiotic can synergistically inhibit bacterial growth, where low concentration of AgNPs has been confirmed to promote the proliferation and osteogenesis of osteoblasts...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28730725/targeting-nano-drug-delivery-to-cancer-cells-using-tunable-multi-layer-silver-decorated-gold-nanorods
#3
Zeid A Nima, Ahmed M Alwbari, Vijayalakshmi Dantuluri, Rabab N Hamzah, Natasha Sra, Pooja Motwani, Konstantinos Arnaoutakis, Rebecca A Levy, Amani F Bohliqa, Dmitry Nedosekin, Vladimir P Zharov, Issam Makhoul, Alexandru S Biris
Multifunctional nanoparticles have high potential as targeting delivery vehicles for cancer chemotherapy. In this study, silver-decorated gold nanorods (AuNR\Ag) have been successfully used to deliver specific, targeted chemotherapy against breast cancer (MCF7) and prostate carcinoma (PC3) cell lines. Doxorubicin, a commonly used chemotherapy, and anti-Epithelial cell adhesion molecule (anti-EpCAM) antibodies were covalently bonded to thiolated polyethylene glycol-coated AuNR\Ag, and the resultant system was used to deliver the drugs to cancer cells in vitro...
July 21, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28730357/biosynthesis-of-silver-nanoparticles-from-spirulina-microalgae-and-its-antibacterial-activity
#4
Govarthanan Muthusamy, Selvankumar Thangasamy, Mythili Raja, Sudhakar Chinnappan, Selvam Kandasamy
The present work focuses on a low-cost, simple, and green synthesis of silver nanoparticles (AgNPs) by mixing AgNO3 solution with the extract of Spirulina platensis (SP) without any chemical reducing and/or capping agents. The green synthesis of AgNPs was confirmed by the color change from colorless to yellowish brown. The biosynthesis of AgNPs was further confirmed by UV-visible spectroscopy (UV-vis), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), biological transmission electron microscopy (Bio-TEM), and energy dispersive X-ray analysis (EDX)...
July 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28728033/deposition-pattern-and-tracer-particle-motion-of-evaporating-multi-component-sessile-droplets
#5
Muhammad Amjad, Yang Yang, Ghulam Raza, Hui Gao, Jun Zhang, Leping Zhou, Xiaoze Du, Dongsheng Wen
The understanding of near-wall motion, evaporation behavior and dry pattern of sessile nanofluid droplets is fundamental to a wide range of applications such as painting, spray drying, thin film coating, fuel injection and inkjet printing. However, a deep insight into the heat transfer, fluid flow, near-wall particle velocity and their effects on the resulting dry patterns is still much needed to take the full advantage of these nano-sized particles in the droplet. This work investigates the effect of direct absorptive silicon/silver (Si/Ag) hybrid nanofluids via two experiments...
July 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28727434/ellipsometry-of-colloidal-solutions-new-experimental-setup-and-application-to-metallic-colloids
#6
Yann Battie, Michel Stchakovsky, Aotmane En Naciri, Suzanna Akil, Nouari Chaoui, Laurent Broch
An ellipsometric cell is developed to simultaneously determine the shape distribution, the volume fraction, and the complex refractive index of gold and silver colloids. Simulation reveals that this cell drastically improves the detection limit of ellipsometry. Indeed, Ag and Au nanoparticles (NPs) are detected at the ppmv level. We demonstrate that the NPs shape distribution can be estimated from ellipsometric measurements by analyzing them with a shape distributed effective medium theory (SDEMT). The obtained distributions from ellipsometry are in agreement with those deduced from transmission electron microcopy (TEM)...
July 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28727146/antimicrobial-effects-of-silver-nanoparticles-synthesized-by-fatsia-japonica-leaf-extracts-for-preservation-of-citrus-fruits
#7
Jing Zhang, Guoguo Si, Jun Zou, Ruiliang Fan, Ailing Guo, Xuetuan Wei
Due to their potent antimicrobial activity, silver nanoparticles (AgNPs) synthesized by biomass might be promising in food preservation, whereas effects of AgNPs on Penicillium italicum-induced rot of Citrus fruits have not been investigated. In this study, a novel AgNPs biosynthesis method was developed based on Fatsia japonica leaf extracts. It was revealed that concentrations of leaf extracts, AgNO3 and NaCl affected AgNPs yields and particle sizes obviously. Under the optimized conditions (8 mg/mL extracts, 2 mM AgNO3 and 1 mM NaCl), AgNPs, synthesized within 80 min, showed potent preservative effect against P...
July 20, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28726382/interparticle-reactions-an-emerging-direction-in-nanomaterials-chemistry
#8
K R Krishnadas, Ananya Baksi, Atanu Ghosh, Ganapati Natarajan, Anirban Som, Thalappil Pradeep
Nanoparticles exhibit a rich variety in terms of structure, composition, and properties. However, reactions between them remain largely unexplored. In this Account, we discuss an emerging aspect of nanomaterials chemistry, namely, interparticle reactions in solution phase, similar to reactions between molecules, involving atomically precise noble metal clusters. A brief historical account of the developments, starting from the bare, gas phase clusters, which led to the synthesis of atomically precise monolayer protected clusters in solution, is presented first...
July 20, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28724260/pleuropterus-multiflorus-hasuo-mediated-straightforward-eco-friendly-synthesis-of-silver-gold-nanoparticles-and-evaluation-of-their-anti-cancer-activity-on-a549-lung-cancer-cell-line
#9
Verónica Castro-Aceituno, Ragavendran Abbai, Seong Soo Moon, Sungeun Ahn, Ramya Mathiyalagan, Yu-Jin Kim, Yeon-Ju Kim, Deok Chun Yang
Pleuropterus multiflorus (Hasuo) is a widely used medicinal plant in Korea and China for treating amnesia, isnomia, heart throbbing etc. With the constructive idea of promoting the wide-spread usage of P. multiflorus, we propose its indirect usage in the form of biologically active silver (Pm-AgNPs) and gold nanoparticles (Pm-AuNPs). The synthesized nanoparticles were predominantly spherical, crystalline with the Z-average hydrodynamic diameter of 274.8nm and 104.8nm respectively. Also, proteins and phenols were identified as the major players involved in their synthesis and stability...
July 15, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28723214/electrokinetic-manipulation-integrated-plasmonic-photonic-hybrid-raman-nanosensors-with-dually-enhanced-sensitivity
#10
Chao Liu, Zheng Wang, Erwen Li, Zexi Liang, Swapnajit Chakravarty, Xiaochuan Xu, Alan X Wang, Ray T Chen, Donglei Fan
To detect biochemicals with ultrahigh sensitivity, efficiency, reproducibility, and specificity has been the holy grail in the development of nanosensors. In this work, we report an innovative type of photonic-plasmonic hybrid Raman nanosensor integrated with electrokinetic manipulation by rational design, which offers dual mechanisms that enhance the sensitivity for molecule detection directly in solution. For the first time, we integrate large arrays of synthesized plasmonic nanocapsules with densely surface distributed silver (Ag) nanoparticles (NPs) on lithographically patterned photonic crystal slabs via electric-field assembling...
March 24, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723143/an-ultrasensitive-plasmonic-nanosensor-for-aldehydes
#11
Meng Li, Lei Shi, Tao Xie, Chao Jing, Guangli Xiu, Yi-Tao Long
Glucose is the most common but important aldehyde, and it is necessary to create biosensors with high sensitivity and anti-interference to detect it. Under the existence of silver ions and aldehyde compounds, single gold nanoparticles and freshly formed silver atoms could respectively act as core and shell, which finally form a core-shell structure. By observing the reaction between glucose and Tollens' reagent, metallic silver was found to be reduced on the surface of gold nanoparticles and formed Au@Ag nanoparticles that lead to a direct wavelength shift...
February 24, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723108/oral-exposure-of-silver-nanoparticles-or-silver-ions-may-aggravate-fatty-liver-disease-in-overweight-mice
#12
Jianbo Jia, Feifei Li, Hongyu Zhou, Yuhong Bai, Sijin Liu, Yiguo Jiang, Guibin Jiang, Bing Yan
As the applications and environmental release of silver ions and nanoparticles are increasing, growing human exposures to these pollutants have become an emerging health concerns. The impeding effects of such pollutants on susceptible populations are severely under-studied. Here, we demonstrate that Ag NPs, at a dose that causes no general toxicity in normal mice, promote the progression of fatty liver disease from steatosis to steatohepatitis only in overweight mice. Exposure to Ag+ ions induces the same effects in overweight mice...
July 19, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28723090/transformative-heterointerface-evolution-and-plasmonic-tuning-of-anisotropic-trimetallic-nanoparticles
#13
Mouhong Lin, Gyeong-Hwan Kim, Jae-Ho Kim, Jeong-Wook Oh, Jwa-Min Nam
Multi-component nanoparticles that incorporate multiple nano-crystal domains into a single particle represent an important class of material with highly tailorable structures and properties. The controlled synthesis of multi-component NPs with 3 or more components with the desired structure, particularly aniso-tropic structures, and property is, however, highly challenging. Here, we developed a polymer and galvanic replacement reac-tion-based transformative heterointerface evolution (THE) method to form and tune gold-copper-silver multi-metallic ani-sotropic nanoparticles (MAPs) with well-defined configurations, including structural order, uniformity and junction geometry, giving rise to extraordinarily high tunability in the structural design, synthesis and optical property of tri-metallic plasmonic nanoantenna structures...
July 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28723074/paper-based-bimodal-sensor-for-electronic-skin-applications
#14
Minhyun Jung, Kyungkwan Kim, Bumjin Kim, Haena Cheong, Kwanwoo Shin, Oh-Sun Kwon, Jong-Jin Park, Sanghun Jeon
We present the development of a flexible bimodal sensor using a paper platform and ink-jet printing method, which are suited for low-cost fabrication processes and realization of flexible devices. In this study, we employed a vertically stacked bimodal device architecture in which a temperature sensor is stacked on top of a pressure sensor and operated on different principles, allowing the minimization of interference effects. For the temperature sensor placed in the top layer, we used the thermoelectric effect and formed a closed-loop thermocouple composed of two different printable inks: conductive PEDOT:PSS and silver nanoparticles on a flexible paper platform, and obtained temperature-sensing capability over a wide range (150 ℃)...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28722828/bioaccumulation-based-silver-nanoparticle-toxicity-in-daphnia-magna-and-maternal-impacts
#15
Sunandan Pakrashi, Cheng Tan, Wen-Xiong Wang
In this study, we tested whether the bioaccumulation in specific tissues of Daphnia magna could explain silver nanoparticles (AgNPs) toxicity. Daphnids were exposed to different concentrations of well suspended AgNPs and AgNO3 . The accumulations of Ag in the whole body, guts and non-gut tissues, as well as the mortality of daphnids were recorded over a period of 7 days. Regression analysis showed higher degree of positive correlation between the concentration of Ag in the non-gut tissues than gut tissues and the mortality of the daphnids...
July 19, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28722404/high-performance-colorimetric-detection-of-thiosulfate-by-using-silver-nanoparticles-for-smartphone-based-analysis
#16
Chen Dong, Zhuqing Wang, Yujie Zhang, Xuehua Ma, M Zubair Iqbal, Lijing Miao, Zhuangwei Zhou, Zheyu Shen, Aiguo Wu
Developing thiosulfate (S2O32-) sensors with silver nanoparticles (AgNPs) for analysis of aqueous solutions with the interference of other anions remains challenging. In this study, we propose a new strategy for excellent selective colorimetric detection of S2O32-. The non-morphological transition of AgNPs leading to a color change from yellow to brown is verified by UV-vis, TEM, DLS, SEM, and XPS analyses. The sensor exhibits high sensitivity with detection limits of 1.0 µM by naked-eye determination and 0...
July 19, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28721743/responses-of-human-hepatoma-hepg2-cells-to-silver-nanoparticles-and-polycyclic-aromatic-hydrocarbons
#17
Francisco Filipak Neto, Ludiana Cardoso da Silva, Samuel Liebel, Carmen Lúcia Voigt, Ciro Alberto de Oliveira Ribeiro
The nanotechnology has revolutionized the global market with silver nanoparticles (AgNP) occupying a prominent position due to their remarkable anti-bacterial properties. However, there is no data about the adverse and toxic effects of associations of AgNP and ubiquitous compounds, such as polycyclic aromatic hydrocarbons (PAH). In the current study, we investigated the responses of HepG2 cells to realistic concentrations of AgNP (0.09, 0.9 and 9 ng ml(-1)) and mixture of PAH (30 and 300 ng ml(-1)), separately and in association...
July 19, 2017: Toxicology Mechanisms and Methods
https://www.readbyqxmd.com/read/28721573/exposure-to-silver-nanoparticles-affects-viability-and-function-of-natural-killer-cells-mostly-via-the-release-of-ions
#18
Loretta Müller, Selina K Steiner, Laura Rodriguez-Lorenzo, Alke Petri-Fink, Barbara Rothen-Rutishauser, Philipp Latzin
Natural killer (NK) cells play a crucial role in linking innate and adaptive immune responses, especially during viral infections and tumor surveillance. They have two major effector functions: the killing of stressed/abnormal cells and the release of cytokines. Their activity is regulated via inhibitory and activating surface receptors. At the same time that the production and use of engineered nanoparticles is steadily increasing, the risk for exposure to silver nanoparticles (AgNPs) from consumer products or biomedical applications is growing...
July 18, 2017: Cell Biology and Toxicology
https://www.readbyqxmd.com/read/28721025/antibacterial-effect-of-silver-nanoparticles-in-pseudomonas-aeruginosa
#19
R Salomoni, P Léo, A F Montemor, B G Rinaldi, Mfa Rodrigues
Pseudomonas aeruginosa has great intrinsic antimicrobial resistance limiting the number of effective antibiotics. Thus, other antimicrobial agents such as silver nanoparticles (AgNPs) are considered potential agents to help manage and prevent infections. AgNPs can be used in several applications against bacteria resistant to common antibiotics or even multi-resistant bacteria such as P. aeruginosa. This study assessed the antimicrobial activity of commercial 10 nm AgNPs on two hospital strains of P. aeruginosa resistant to a large number of antibiotics and a reference strain from a culture collection...
2017: Nanotechnology, Science and Applications
https://www.readbyqxmd.com/read/28720002/green-synthesis-of-silver-nanoparticles-using-prosopis-juliflora-bark-extract-reaction-optimization-antimicrobial-and-catalytic-activities
#20
Geeta Arya, R Mankamna Kumari, Nidhi Gupta, Ajeet Kumar, Ramesh Chandra, Surendra Nimesh
In the present study, silver nanoparticles (PJB-AgNPs) have been biosynthesized employing Prosopis juliflora bark extract. The biosynthesis of silver nanoparticles was monitored on UV-vis spectrophotometer. The size, charge and polydispersity index (PDI) of PJB-AgNPs were determined using dynamic light scattering (DLS). Different parameters dictating the size of PJB-AgNPs were explored. Nanoparticles biosynthesis optimization studies suggested efficient synthesis of highly dispersed PJB-AgNPs at 25 °C when 9...
July 18, 2017: Artificial Cells, Nanomedicine, and Biotechnology
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