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Nanoparticles

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https://www.readbyqxmd.com/read/28212595/preparation-and-characterization-of-gold-nanoparticles-in-the-presence-of-citrate-and-soybean-seed-extract-in-an-acidic-conditions
#1
Ebrahim Izadi, Ali Rasooli, Abolfazl Akbarzadeh, Soodabeh Davaran
Through the present study, an eco-friendly method was used to synthesize the gold nanoparticles (GNPs) by using the sodium citrate and extract of the soybean seed as reducing the agents at PH 3. X-Ray diffraction (XRD) method was used to evaluate the crystal structure of as-synthesized NPs and it's revealed that this method leads to well crystallized GNPs. In order to determine the particle size and their distribution, field emission scanning microscopy (FE-SEM) and dynamic light scattering (DLS) were used...
February 17, 2017: Drug Research
https://www.readbyqxmd.com/read/28212584/hyaluronic-acid-serum-albumin-conjugate-based-nanoparticles-for-targeted-cancer-therapy
#2
Ravit Edelman, Yehuda G Assaraf, Inna Levitzky, Tal Shahar, Yoav D Livney
Multiple carcinomas including breast, ovarian, colon, lung and stomach cancer, overexpress the hyaluronic acid (HA) receptor, CD44. Overexpression of CD44 contributes to key cancer processes including tumor invasion, metastasis, recurrence, and chemoresistance. Herein, we devised novel targeted nanoparticles (NPs) for delivery of anticancer chemotherapeutics, comprised of self-assembling Maillard reaction-based conjugates of HA and bovine serum albumin (BSA). HA served as the hydrophilic block, and as the ligand for actively targeting cancer cells overexpressing CD44...
February 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28212517/phytoremediation-of-dyes-using-lagerstroemia-speciosa-mediated-silver-nanoparticles-and-its-biofilm-activity-against-clinical-strains-pseudomonas-aeruginosa
#3
V Sai Saraswathi, Neethu Kamarudheen, K V BhaskaraRao, K Santhakumar
The aim of this study was to prepare silver nanoparticles by a green method using the aqueous leaves extract of Lagerstroemia speciosa. The prepared silver nanoparticles were characterized, studied for its photocatalytic and biofilm inhibition studies. The maximum absorbance peak was found at 427nm and thus confirming the formation of silver nanoparticles. The average size of silver nanoparticles synthesized was found to be 12nm using XRD and it was spherical in shape. The nanoparticles synthesized was investigated for photocatalytic activity for to two different dye molecules, methyl orange and methylene blue showing 310 and 290min degradation time respectively...
February 10, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28212500/cyto-genotoxic-and-dna-methylation-changes-induced-by-different-crystal-phases-of-tio2-np-in-bronchial-epithelial-16-hbe-cells
#4
Manosij Ghosh, Deniz Öner, Radu-Corneliu Duca, Stevan M Cokic, Sven Seys, Stef Kerkhofs, Kirsten Van Landuyt, Peter Hoet, Lode Godderis
With the increase in use of TiO2-np, a better understanding of their safety is important. In the present study the effect of different crystal phases of TiO2-np (anatase, rutile and anatase: rutile mixture; 20-26nm) were studied for cyto-genotoxicity and global DNA methylation and hydroxymethylation. Cytotoxic response was observed at a concentration of 25μg/ml for the particles tested. Results of comet and micronucleus (with and without CytB) assays revealed significant genotoxic effect of these particles...
February 10, 2017: Mutation Research
https://www.readbyqxmd.com/read/28212489/direct-single-enzyme-biomineralization-of-catalytically-active-ceria-and-ceria-zirconia-nanocrystals
#5
Christopher D Curran, Li Lu, Yue Jia, Christopher J Kiely, Bryan W Berger, Steven McIntosh
Biomineralization is an intriguing approach to the synthesis of functional inorganic materials for energy applications whereby biological systems are engineered to mineralize inorganic materials and control their structure over multiple length scales under mild reaction conditions. Herein we demonstrate a single enzyme mediated biomineralization route to synthesize crystalline, catalytically active, quantum confined ceria (CeO2-x) and ceria-zirconia (Ce1-yZryO2-x) nanocrystals for application as environmental catalysts...
February 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28212485/efficient-upconverting-multiferroic-core-shell-photocatalysts-visible-to-near-infrared-photon-harvesting
#6
Jianming Zhang, Yue Huang, Lei Jin, Federico Rosei, Fiorenzo Vetrone, Jerome P Claverie
We report the two-step synthesis of a core@shell nanohybrid material for visible-to-near-infrared (NIR) photocatalysis. The core is constituted of NaGdF4:Er(3+), Yb(3+) upconverting nanoparticles (UCNPs). A bismuth ferrite (BFO) shell is assembled around the UCNPs via a hydrothermal process. The photocatalytic degradation assays of organic compounds of methylene orange and 4-chlorophenol reveal that core@shell nanostructures possess remarkably enhanced reaction activity under visible and NIR irradiation, compared to the BFO powder alone and the BFO-UCNP mixture...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28212344/green-microwave-assisted-combustion-synthesis-of-zinc-oxide-nanoparticles-with-citrullus-colocynthis-l-schrad-characterization-and-biomedical-applications
#7
Susan Azizi, Rosfarizan Mohamad, Mahnaz Mahdavi Shahri
In this paper, a green microwave-assisted combustion approach to synthesize ZnO-NPs using zinc nitrate and Citrullus colocynthis (L.) Schrad (fruit, seed and pulp) extracts as bio-fuels is reported. The structure, optical, and colloidal properties of the synthesized ZnO-NP samples were studied. Results illustrate that the morphology and particle size of the ZnO samples are different and depend on the bio-fuel. The XRD results revealed that hexagonal wurtzite ZnO-NPs with mean particle size of 27-85 nm were produced by different bio-fuels...
February 16, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28212282/collagen-gold-nanoparticle-conjugates-for-versatile-biosensing
#8
Sarah Unser, Samuel Holcomb, ReJeana Cary, Laura Sagle
Integration of noble metal nanoparticles with proteins offers promising potential to create a wide variety of biosensors that possess both improved selectivity and versatility. The multitude of functionalities that proteins offer coupled with the unique optical properties of noble metal nanoparticles can allow for the realization of simple, colorimetric sensors for a significantly larger range of targets. Herein, we integrate the structural protein collagen with 10 nm gold nanoparticles to develop a protein-nanoparticle conjugate which possess the functionality of the protein with the desired colorimetric properties of the nanoparticles...
February 15, 2017: Sensors
https://www.readbyqxmd.com/read/28212271/carbon-nanotubes-as-an-effective-opportunity-for-cancer-diagnosis-and-treatment
#9
REVIEW
Alessandro Sanginario, Beatrice Miccoli, Danilo Demarchi
Despite the current progresses of modern medicine, the resistance of malignant tumors to present medical treatments points to the necessity of developing new therapeutic approaches. In recent years, numerous studies have focused their attention on the promising use of nanomaterials, like iron oxide nanowires, zinc oxide or mesoporous silica nanoparticles, for cancer and metastasis treatment with the advantage of operating directly at the bio-molecular scale. Among them, carbon nanotubes emerged as valid candidates not only for drug delivery, but also as a valuable tool in cancer imaging and physical ablation...
February 15, 2017: Biosensors
https://www.readbyqxmd.com/read/28212026/isotope-tracers-to-study-the-environmental-fate-and-bioaccumulation-of-metal-containing-engineered-nanoparticles-techniques-and-applications
#10
Yongguang Yin, Zhiqiang Tan, Ligang Hu, Sujuan Yu, Jingfu Liu, Guibin Jiang
The rapidly growing applicability of metal-containing engineered nanoparticles (MENPs) has made their environmental fate, biouptake, and transformation important research topics. However, considering the relatively low concentration of MENPs and the high concentration of background metals in the environment and in organisms, tracking the fate of MENPs in environment-related scenarios remains a challenge. Intrinsic labeling of MENPs with radioactive or stable isotopes is a useful tool for the highly sensitive and selective detection of MENPs in the environment and organisms, thus enabling tracing of their transformation, uptake, distribution, and clearance...
February 17, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28212023/electrostatic-assembly-of-functional-and-macromolecular-ferricinium-chloride-stabilized-gold-nanoparticles
#11
Roberto Ciganda, Haibin Gu, Ricardo Hernandez, Ane Escobar, Angel Martínez, Luis Yates, Sergio Moya, Jaime Ruiz, Didier Astruc
Substituted ferrocenes with various stereoelectronic effects including a ferrocene-terminated dendrimer in ether reduce aqueous HAuCl4 to gold nanoparticles (AuNPs) by interfacial electron transfer. The dependence on the stirring speed plays a crucial role, and the stereoelectronic influences on the reaction rates are dramatic. With a ferrocene-containing polymer, the reaction is conducted using an homogeneous THF/water medium, also forming AuNPs. Fully stable functional, dendritic and polymeric ferricinium chloride-stabilized AuNPs are obtained with core sizes between 13 and 35 nm, an optimal size range for potential biomedical applications...
February 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28212004/fluorescence-regulation-of-poly-thymine-templated-copper-nanoparticles-via-an-enzyme-triggered-reaction-towards-sensitive-and-selective-detection-of-alkaline-phosphatase
#12
Junyao Li, Ling Si, Jianchun Bao, Zhaoyin Wang, Zhihui Dai
The activity of alkaline phosphatase (ALP) is a crucial index of blood routine examinations, since the concentration of ALP is highly associated with various human diseases. To address the demands of clinical tests, efforts should be made to develop more approaches that can sense ALP in real samples. Recently, we find that fluorescence of poly(30T)-templated copper nanoparticles (CuNPs) can be directly and effectively quenched by pyrophosphate ion (PPi), provid-ing new perspective in designing sensitive biosensors based on DNA-templated CuNPs...
February 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28211933/enhanced-bone-tissue-regeneration-using-a-3d-printed-microstructure-incorporated-with-a-hybrid-nano-hydrogel
#13
Dong Nyoung Heo, Nathan J Castro, Se-Jun Lee, Hanaul Noh, Wei Zhu, Lijie Grace Zhang
Three-dimensional (3D) functional constructs with biomimetic mechanical and chemical properties are ideal for various regenerative medicine applications. These properties of 3D fabricated constructs mainly depend on the intrinsic characteristics of the materials and fabrication method. In this respect, the current use of hydrogels for musculoskeletal tissue repair is not ideal due to the lack of suitable mechanical properties, as well as the high biomimetic requirement for success. To overcome this limitation, we developed a novel functionalized hydrogel with bioactive gold nanoparticles (GNPs), reinforcing a 3D printed microstructure via fused deposition modeling (FDM) for bone tissue regeneration...
February 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28211930/stable-amphiphilic-supramolecular-self-assembly-based-on-cyclodextrin-and-carborane-for-the-efficient-photodynamic-therapy
#14
Hejian Xiong, Dongfang Zhou, Xiaohua Zheng, Yanxin Qi, Yongheng Wang, Xiabin Jing, Yubin Huang
Novel and stable supramolecular nanoparticles (NP) were prepared based on the high affinity of carboranes to β-cyclodextrin for the efficient photodynamic therapy of porphyrin in vitro.
February 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28211929/calcium-phosphate-nanoparticles-prepared-from-infusion-fluids-for-stem-cell-transfection-process-optimization-and-cytotoxicity-analysis
#15
Quazi T H Shubhra, Ayako Oyane, Hiroko Araki, Maki Nakamura, Hideo Tsurushima
This is the first study to report the use of infusion fluids for particle-mediated gene delivery with DNA-immobilized calcium phosphate (CaP) nanoparticles (NPs). In conventional CaP systems, CaP NPs are fabricated in labile supersaturated CaP solutions which are prepared from chemical reagents. In the present study, we fabricated CaP NPs via coprecipitation in labile supersaturated CaP solutions that were prepared from infusion fluids (even the water used was of injectable quality) instead of chemical reagents and demonstrated their gene delivery capabilities for the hard to transfect pluripotent stem cell (C3H10T1/2) along with the easy to transfect CHO-K1 cell...
February 17, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28211928/facile-synthesis-of-stable-water-soluble-dendron-coated-gold-nanoparticles
#16
Alan E Enciso, Giovanni Doni, Riccardo Nifosì, Ferruccio Palazzesi, Roberto Gonzalez, Amy A Ellsworth, Jeffery L Coffer, Amy V Walker, Giovanni M Pavan, Ahmed A Mohamed, Eric E Simanek
Upon reduction with sodium borohydride, diazonium tetrachloroaurate salts of triazine dendrons yield dendron-coated gold nanoparticles connected by a gold-carbon bond. These robust nanoparticles are stable in water and toluene solutions for longer than one year and present surface groups that can be reacted to change surface chemistry and manipulate solubility. Molecular modeling was used to provide insight on the hydration of the nanoparticles and their observed solubilties.
February 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28211898/rapid-prototyping-of-all-solution-processed-multi-lengthscale-electrodes-using-polymer-induced-thin-film-wrinkling
#17
Christine M Gabardo, Robert C Adams-McGavin, Barnabas C Fung, Eric J Mahoney, Qiyin Fang, Leyla Soleymani
Three-dimensional electrodes that are controllable over multiple lengthscales are very important for use in bioanalytical systems that integrate solid-phase devices with solution-phase samples. Here we present a fabrication method based on all-solution-processing and thin film wrinkling using smart polymers that is ideal for rapid prototyping of tunable three-dimensional electrodes and is extendable to large volume manufacturing. Although all-solution-processing is an attractive alternative to vapor-based techniques for low-cost manufacturing of electrodes, it often results in films suffering from low conductivity and poor substrate adhesion...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211702/antimicrobial-effect-of-biocompatible-silicon-nanoparticles-activated-by-therapeutic-ultrasound
#18
Svetlana N Shevchenko, Markus Burkhardt, Eugene V Sheval, Ulyana A Natashina, Christina Große, Alexander L Nikolaev, Alexander V Gopin, Ute Neugebauer, Andrew A Kudryavtsev, Vladimir Sivakov, Liubov Andreevna Osminkina
In this study, we report on a method for suppressing of Escherichia coli (E.coli) vitality by means of therapeutic ultrasound irradiation (USI) using biocompatible silicon nanoparticles as cavitation sensitizers. Silicon nanoparticles without (SiNPs) and with polysaccharide (dextran) coating (DSiNPs) were used. Both types of nanoparticles were non-toxic to Hep 2 cells up to concentration of 2 mg/ml. The treatment of bacteria with nanoparticles and application of 1 W/cm2 USI resulted in reduction of their viability up to 35% and 72% for SiNPs and DSiNPs, respectively...
February 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28211680/two-way-gold-nanoparticle-label-free-sensing-of-specific-sequence-and-small-molecule-targets-using-switchable-concatemers
#19
Longjiao Zhu, Xiangli Shao, Yunbo Luo, Kunlun Huang, Wentao Xu
A two-way colorimetric biosensor based on unmodified gold nanoparticles (GNPs) and a switchable double-stranded DNA (dsDNA) concatemer have been demonstrated. Two hairpin probes (H1&H2) were first designed that provided the fuels to assemble the dsDNA concatemers via hybridization chain reaction (HCR). A functional hairpin (FH) was rationally designed to recognize the target sequences. All the hairpins contained single-stranded DNA (ssDNA) loop and sticky-ends to prevent GNPs from salt-induced aggregation. In the presence of target sequence, the capture probe blocked in the FH recognizes the target to form a duplex DNA, which causes the release of the initiator probe by FH conformational change...
February 17, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28211526/stable-optical-trapping-and-sensitive-characterization-of-nanostructures-using-standing-wave-raman-tweezers
#20
Mu-Ying Wu, Dong-Xiong Ling, Lin Ling, William Li, Yong-Qing Li
Optical manipulation and label-free characterization of nanoscale structures open up new possibilities for assembly and control of nanodevices and biomolecules. Optical tweezers integrated with Raman spectroscopy allows analyzing a single trapped particle, but is generally less effective for individual nanoparticles. The main challenge is the weak gradient force on nanoparticles that is insufficient to overcome the destabilizing effect of scattering force and Brownian motion. Here, we present standing-wave Raman tweezers for stable trapping and sensitive characterization of single isolated nanostructures with a low laser power by combining a standing-wave optical trap with confocal Raman spectroscopy...
February 17, 2017: Scientific Reports
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