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https://www.readbyqxmd.com/read/28549217/surface-enhanced-raman-scattering-active-gold-nanoparticles-with-enzyme-mimicking-activities-for-measuring-glucose-and-lactate-in-living-tissues
#1
Yihui Hu, Hanjun Cheng, Xiaozhi Zhao, Jiangjiexing Wu, Faheem Muhammad, Shichao Lin, Jian He, Liqi Zhou, Chengping Zhang, Yu Deng, Peng Wang, Zhengyang Zhou, Shuming Nie, Hui Wei
Gold nanoparticles (AuNPs) with simultaneous plasmonic and biocatalytic properties provide a promising approach to developing versatile bioassays. However, the combination of AuNPs' intrinsic enzyme mimicking properties with their surface-enhanced Ra-man scattering (SERS) activities has yet to be explored. Here we designed a peroxidase mimicking nanozyme by in situ growing AuNPs into a highly porous and thermally stable metal-organic framework (MOF) called MIL-101. The obtained AuNPs@MIL-101 nanozymes acted as the peroxidase mimics to oxidize Raman inactive reporter leucomalachite green (LMG) into the active malachite green (MG) with hydrogen peroxide, and simultaneously as the SERS substrates to enhance the Raman signals of the as-produced MG...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28546912/observation-of-metal-nanoparticles-for-acoustic-manipulation
#2
Mian Chen, Feiyan Cai, Chen Wang, Zhiyong Wang, Long Meng, Fei Li, Pengfei Zhang, Xin Liu, Hairong Zheng
Use of acoustic trapping for the manipulation of objects is invaluable to many applications from cellular subdivision to biological assays. Despite remarkable progress in a wide size range, the precise acoustic manipulation of 0D nanoparticles where all the structural dimensions are much smaller than the acoustic wavelength is still present challenges. This study reports on the observation of metal nanoparticles with different nanostructures for acoustic manipulation. Results for the first time exhibit that the hollow nanostructures play more important factor than size in the nanoscale acoustic manipulation...
May 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28546899/assembly-of-metallic-nanoparticle-arrays-on-glass-via-nanoimprinting-and-thin-film-dewetting
#3
Sun-Kyu Lee, Sori Hwang, Yoon-Kee Kim, Yong-Jun Oh
We propose a nanofabrication process to generate large-area arrays of noble metal nanoparticles on glass substrates via nanoimprinting and dewetting of metallic thin films. Glass templates were made via pattern transfer from a topographic Si mold to an inorganically cross-linked sol-gel (IGSG) resist on glass using a two-layer polydimethylsiloxane (PDMS) stamp followed by annealing, which turned the imprinted resist into pure silica. The transparent, topographic glass successfully templated the assembly of Au and Ag nanoparticle arrays via thin-film deposition and dewetting at elevated temperatures...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28545186/gallium-nanoparticle-mediated-reduction-of-brain-specific-serine-protease-4-in-an-experimental-metastatic-cancer-model
#4
Enas M Moustafa, Marwa Abdelhameed Mohamed, Noura M Thabet
Purpose: Tumor growth and metastasis depend on angiogenesis; therefore, efforts are being made to develop specific angiogenic inhibitors. Gallium (Ga) is the second most common metal ion, after platinum, used in cancer treatment. Its activities are numerous and various. In the present study, we aimed to investigate the effect of Ga on brain metastasis arising from hepatocellular carcinoma (HCC). Materials and methods: Forty experimental rats (divided into 4 groups) received diethylnitrosamine (DEN) at a dose (20 mg/kg...
April 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28544781/pd-nanoparticles-immobilized-on-individual-calcium-carbonate-plate-derived-from-mussel-shell-waste-an-eco-friendly-catalyst-for-copper-free-sonogashira-coupling-reaction
#5
Trin Saetan, Chutiparn Lertvachirapaiboon, Ekgasit Sanong, Mongkol Sukwattanasinitt, Sumrit Wacharasindhu
Conversion of waste into high value materials has been considered an important sustainability strategy in modern chemical industries. Large volume of shell waste is generated globally from mussel cultivation. In this work, mussel shell wastes (Perna viridis) are transformed into individual calcium carbonate plate (ICCP) and apply as a support for heterogeneous catalyst. Palladium nanoparticles (3-6 nm) are deposited with even dispersion on ICCP surface as demonstrated by X-ray diffraction and scanning electron microscopy...
May 22, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28544505/understanding-the-mechanisms-of-gold-shell-growth-onto-polymer-microcapsules-to-control-shell-thickness
#6
Alison Louise Tasker, James Hitchcock, Elaine Alice Baxter, Olivier Cayre, Simon Biggs
Polymer microcapsules have been used commercially for decades, however they have an inherent flaw which renders them impractical as a carrier of small, volatile molecules. The porous nature of the polymer shell allows for diffusion of the encapsulated molecules into the bulk. The use of metal shells is an innovative way to prevent undesired loss of small molecules from the core of microcapsules, however it is important, particularly when using expensive metals to ensure that the resulting shell is as thin as possible...
May 21, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28544178/transition-metal-nitride-core-noble-metal-shell-nanoparticles-as-highly-co-tolerant-catalysts
#7
Aaron Garg, Maria Milina, Madelyn Ball, Daniela Zanchet, Sean T Hunt, James A Dumesic, Yuriy Roman-Leshkov
Core-shell architectures offer an effective way to tune and enhance the properties of noble metal catalysts. Here, we demonstrate the synthesis of Pt shell on titanium tungsten nitride core nanoparticles (Pt/TiWN) by high temperature ammonia nitridation of a parent core-shell carbide material (Pt/TiWC). X-ray photoelectron spectroscopy revealed significant core-level shifts for Pt shells supported on TiWN cores, corresponding to increased stabilization of the Pt valence d-states. The modulation of the electronic structure of the Pt shell by the nitride core translated into enhanced CO tolerance during hydrogen electrooxidation in the presence of CO...
May 25, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28543610/metallic-nanoparticles-irradiated-by-low-energy-protons-for-radiation-therapy-are-there-significant-physical-effects-to-enhance-the-dose-delivery
#8
Anne-Catherine Heuskin, Bernard Gallez, Olivier Feron, Philippe Martinive, Carine Michiels, Stéphane Lucas
PURPOSE: To identify which physical properties of nanoparticles are correlated to the survival fraction of cells exposed in vitro to low energy protons in combination with nanoparticles. METHODS: The Geant4 simulation toolkit (version 10.3) was used to model nanoparticles of different sizes (5 to 50 nm) and materials (Ti, Zr, Hf, Ta, Au, Pt), with or without an organic capping ensuring biocompatibility and to irradiate them with 1.3 or 4 MeV protons and 5.3 MeV alpha particles...
May 23, 2017: Medical Physics
https://www.readbyqxmd.com/read/28541686/general-oriented-formation-of-carbon-nanotubes-from-metal-organic-frameworks
#9
Jiashen Meng, Chaojiang Niu, Linhan Xu, Jiantao Li, Xiong Liu, Xuanpeng Wang, Yuzhu Wu, Xiaoming Xu, Wenyi Chen, Qi Li, Zi-Zhong Zhu, Dongyuan Zhao, Liqiang Mai
Carbon nanotubes (CNTs) are of great interest for many potential applications because of their extraordinary electronic, mechanical and structural properties. However, issues of chaotic staking, high cost and high energy dissipation in the synthesis of CNTs remain to be resolved. Here we develop a facile, general and high-yield strategy for the oriented formation of CNTs from metal-organic frameworks (MOFs) through a low-temperature (as low as 430 °C) pyrolysis process. The selected MOF crystals act as a single precursor for both nanocatalysts and carbon sources...
May 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28541350/ultrasensitive-and-reproducible-sers-platform-of-coupled-ag-grating-with-multibranched-au-nanoparticles
#10
Yevgeniya Kalachyova, David Mares, Vitezslav Jerabek, Pavel Ulbrich, Ladislav Lapcak, Vaclav Svorcik, Oleksiy Lyutakov
Surface-enhanced Raman scattering (SERS) spectroscopy is an extremely sensitive analytical technique that is capable of identifying the vibration signatures of target molecules up to single-molecule sensitivity. In this work, the ultrahigh sensitivity of SERS has been achieved through the immobilization of sharp-edges specific nanoparticles - so-called gold multibranched NPs (AuMs) on the silver grating surface through the biphenyl dithiol. This approach allows combining the extremely high SERS enhancement factor (better than that in the case of AuMs immobilized on the flat Ag film) with perfect reproducibility of Raman signals...
May 25, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28541035/three-dimensional-printing-of-silver-microarchitectures-using-newtonian-nanoparticle-inks
#11
Sanghyeon Lee, Jung Hyun Kim, Muhammad Wajahat, Hwakyung Jeong, Won Suk Chang, Sung Ho Cho, Ji Tae Kim, Seung Kwon Seol
Although three-dimensional (3D) printing has recently emerged as a technology to potentially bring about the next industrial revolution, the limited selection of usable materials restricts its use to simple prototyping. In particular, metallic 3D printing with submicrometer spatial resolution is essential for the realization of 3D-printed electronics. Herein, a meniscus-guided 3D printing method that exploits a low-viscosity (∼7 mPa·s) silver nanoparticle (AgNP) ink meniscus with Newtonian fluid characteristics (which is compatible with conventional inkjet printers) to fabricate 3D silver microarchitectures is reported...
May 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28541030/pt-nanoparticle-collisions-detected-by-electrocatalytic-amplification-and-afm-imaging-np-collision-frequency-adsorption-and-random-distribution-at-an-ume-surface
#12
Cesar A Ortiz-Ledón, Cynthia G Zoski
We demonstrate good agreement between the theoretical and experimental collision frequency of individual Pt NPs undergoing collisions at a Au UME (5 µm radius) using electrocatalytic amplification provided by 15 mM hydrazine in 5 mM PB (pH7) over 100 to 300 s. DLS measurements demonstrated that Pt NP aggregation in this solution had the least impact on NP diffusion coefficient and concentration values, which are directly proportional to collision frequency. We show that the smaller, uniform current steps are indicative of NPs of metallic radii in agreement with those determined by TEM, with corresponding larger NP diffusion coefficient and concentration, in agreement with DLS results...
May 25, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28540947/the-role-of-iron-nitrides-in-the-fe-n-c-catalysis-system-towards-the-oxygen-reduction-reaction
#13
Min Wang, Yushi Yang, Xiaobo Liu, Zonghua Pu, Zongkui Kou, Peipei Zhu, Shichun Mu
Fe-N-C series catalysts are always attractive for their high catalytic activity towards the oxygen reduction reaction (ORR). However, they usually consist of various components such as iron nitrides, metallic iron, iron carbides, N-doped carbon and Fe-N4 moieties, leading to controversial contributions of these components to the catalysis of the ORR, especially iron nitrides. In this work, to investigate the function of iron nitrides, FexN nanoparticles (NPs) embedded in mesoporous N-doped carbon without Fe-N4 moieties are designed and constructed by a simple histidine-assisted method...
May 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28540373/in-vitro-cellular-behaviors-and-toxicity-assays-of-small-sized-fluorescent-silicon-nanoparticles
#14
Zhaohui Cao, Fei Peng, Zhilin Hu, Binbin Chu, Yiling Zhong, Yuanyuan Su, Sudan He, Yao He
Extensive investigations have been carried out for evaluating the toxicology of various nanomaterials (e.g., carbon- and metal-based nanomaterials), which offer invaluable information for assessing the feasibility of nanomaterial-based wide-ranging applications. In recent years, sufficient efforts have been made to develop fluorescent small-sized silicon nanoparticles (SiNPs) as a novel optical material simultaneously featuring strong fluorescence and ultrahigh photostability, providing high promise for a myriad of biological, biomedical and electronic applications...
May 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28538196/self-assembly-of-gd-3-sds-hepes-complex-and-curcumin-entrapment-for-enhanced-stability-fluorescence-image-in-cellular-system
#15
Chonticha Sahub, Gamolwan Tumcharern, Prae Chirawatkul, Vithaya Ruangpornvisuti, Sanong Ekgasit, Supasorn Wanichweacharungruang, Thawatchai Tuntulani, Tanapat Palaga, Boosayarat Tomapatanaget
At present, strategies to disperse hydrophobic molecules in water without altering their chemical structures include conventional surfactant-based micellar and vesicular systems, encapsulation into water dispersible polymeric nanoparticles, and loading onto the surface of various metal nanoparticles. Here, we report a simple and low cost platform to incorporate hydrophobic molecules into a stable water dispersible nanostructure that can significantly increase the stability of the encapsulated materials. The platform is based on the incorporation of hydrophobic molecules into the self-assembled complex of gadolinium ion (Gd(3+)), sodium dodecyl sulfate (SDS), and 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES) called GdSH...
May 13, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28537611/metal-nanoinks-as-chemically-stable-surface-enhanced-scattering-sers-probes-for-the-analysis-of-blue-bic-ballpoint-pens
#16
A Alyami, D Saviello, M A P McAuliffe, A Mirabile, L Lewis, D Iacopino
Metal nanoinks constituted by Ag nanoparticles and Au nanorods were employed as probes for the Surface Enhanced Raman Scattering (SERS) analysis of a blue BIC ballpoint pen. The dye components of the pen ink were first separated by thin layer chromatography (TLC) and subsequently analysed by SERS at illumination wavelengths of 514 nm and 785 nm. Compared to normal Raman conditions, enhanced spectra were obtained for all separated spots, allowing easy identification of phthalocyanine Blue 38 and triarylene crystal violet in the ink mixture...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28537384/cysteine-functionalized-metal-organic-framework-facile-synthesis-and-high-efficient-enrichment-of-n-linked-glycopeptides-in-cell-lysate
#17
Wen Ma, Linnan Xu, Xianjiang Li, Sensen Shen, Mei Wu, Yu Bai, Huwei Liu
Cysteine-functionalized metal-organic framework (MOF) was synthesized via a common and facile two-step method of in situ loading of Au nanoparticles on amino-derived MOF followed by L-Cysteine immobilization. Owing to the large specific surface area and ultrahigh hydrophilicity of this nanocomposite, excellent performance was observed in the enrichment of N-linked glycopeptides in both model glycoprotein and HeLa cell lysate. By using this nanocomposite, 16 and 31 glycopeptides were efficiently extracted from digest of horseradish peroxidase (HRP) and human serum immunoglobulin G (IgG), respectively...
May 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28537291/galvanic-replacement-reaction-recent-developments-for-engineering-metal-nanostructures-towards-catalytic-applications
#18
Anderson G M da Silva, Thenner S Rodrigues, Sarah J Haigh, Pedro H C Camargo
Metallic nanoparticles have been extensively studied towards applications in catalysis. Among the several methods for their controlled synthesis, galvanic replacement is particularly attractive as it enables the production of bimetallic and hollow nanomaterials displaying ultrathin walls in a single reaction step. This procedure is versatile, but final morphologies are often limited to shapes that represent the hollow analogues of the starting template nanocrystals. For catalytic applications, it is highly desirable to broaden the scope of physicochemical control that can be achieved by this method...
May 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28535789/a-multi-target-therapeutic-potential-of-prunus-domestica-gum-stabilized-nanoparticles-exhibited-prospective-anticancer-antibacterial-urease-inhibition-anti-inflammatory-and-analgesic-properties
#19
Nazar Ul Islam, Raza Amin, Muhammad Shahid, Muhammad Amin, Sumera Zaib, Jamshed Iqbal
BACKGROUND: Phytotherapeutics exhibit diverse pharmacological effects that are based on the combined action of a mixture of phytoconstituents. In this study, Prunus domestica gum-loaded, stabilized gold and silver nanoparticles (Au/Ag-NPs) were evaluated for their prospective anticancer, antibacterial, urease-inhibition, anti-inflammatory, and analgesic properties. METHODS: Au/Ag-NPs were biosynthesized and characterized with UV-Vis, FTIR, SEM, EDX, and XRD techniques...
May 23, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28535675/a-novel-liposome-based-surface-enhanced-raman-spectroscopy-sers-substrate
#20
William Lum, Ian R Bruzas, Zohre Gorunmez, Sarah A Unser, Thomas L Beck, Laura B Sagle
Although great strides have been made in recent years towards making highly enhancing surface enhanced Raman spectroscopy (SERS) substrates, the biological compatibility of such substrates remains a crucial problem. To address this issue, liposome-based SERS substrates have been constructed in which the biological probe molecule is encapsulated inside the aqueous liposome compartment, and metallic elements are assembled using the liposome as a scaffold. Thus, the probe molecule is not in contact with the metallic surfaces...
May 23, 2017: Journal of Physical Chemistry Letters
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