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https://www.readbyqxmd.com/read/28806859/analysis-of-low-molecular-weight-compounds-using-maldi-and-ldi-tof-ms-direct-detection-of-active-pharmaceutical-ingredients-in-different-formulations
#1
João L Bronzel, Cintia D F Milagre, Humberto M S Milagre
Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry (MALDI-MS) is a high throughput, easy to use analytical technique. The simple sample preparation of this technique and its tolerance to the presence of contaminants are among its advantages. In contrast, depending on the matrix used, MALDI can ionize and generates ions in the low m/z range that complicate the interpretation of the spectra of low molecular weight compounds. To address this issue, one can envisage the use of tunable ionic matrices that can reduce the low m/z interferents...
August 14, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28806678/the-sorptive-and-reductive-capacities-of-biochar-supported-nanoscaled-zero-valent-iron-nzvi-in-relation-to-its-crystallite-size
#2
Shengsen Wang, Yanxia Zhou, Bin Gao, Xiaozhi Wang, Xianqiang Yin, Ke Feng, Jun Wang
In this work, nZVI was immobilized by bamboo derived biochars (nZVI/BB), hydrogen peroxide (H2O2) (nZVI/PBB) and nitric acid (HNO3) (nZVI/HBB) modified BB. H2O2 and HNO3 deceased surface area and pore volume of pristine biochars. Total iron (Fe) contents were 16.50, 24.40, and 13.08% for nZVI/BB, nZVI/PBB and nZVI/HBB, respectively. The X-ray diffraction revealed that nZVI in biochar matrix was dominantly metallic Fe coated with Fe oxides. The transmission electron microscopy indicated nZVI particle sizes were 41...
August 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28806659/single-step-method-to-fabricate-durable-superliquiphobic-coating-on-aluminum-surface-with-self-cleaning-and-anti-fogging-properties
#3
D Nanda, P Varshney, M Satapathy, S S Mohapatra, B Bhushan, A Kumar
The development of self-cleaning and anti-fogging durable superliquiphobic coatings for aluminum surfaces has raised tremendous interest in materials science. In this study, a superliquiphobic coating is fabricated on an aluminum surface by a single-step dip-coating method using 1H,1H,2H,2H-Perfluorooctyltrichlorosilane-modified SiO2 nanoparticles. The successful implementation of the aforesaid coating in different applications requires extensive investigations of its characteristics and stability. To understand the properties of the coating, surface morphology, contact angle, self-cleaning, anti-fogging, and water repellency were investigated under perturbation conditions...
August 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28806654/magnetic-separable-chitosan-microcapsules-decorated-with-silver-nanoparticles-for-catalytic-reduction-of-4-nitrophenol
#4
Peng Xu, Xuguang Liang, Nannan Chen, Jingen Tang, Wei Shao, Qinwei Gao, Zhaogang Teng
In the work, we have synthesized silver (Ag) nanoparticles deposited chitosan (CS) microcapsules with magnetic multiple Fe3O4 cores (denoted as Fe3O4/CS-Ag) as efficient catalysts for the reduction of 4-nitrophenol. The Fe3O4/CS-Ag catalysts are prepared by coating hydrophobic Fe3O4 nanoparticles with chitosan via a multiple emulsion-chemical crosslinking method and following in situ deposition of Ag nanoparticles onto the surfaces. The morphology and composition of the Fe3O4/CS-Ag microcapsules are characterized by Fourier transform infrared (FT-IR) spectra, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy...
August 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28806558/nanoscale-zero-valent-iron-coated-with-rhamnolipid-as-an-effective-stabilizer-for-immobilization-of-cd-and-pb-in-river-sediments
#5
Wenjing Xue, Danlian Huang, Guangming Zeng, Jia Wan, Chen Zhang, Rui Xu, Min Cheng, Rui Deng
Nanoremediation strategies applied to contaminated river sediments can induce changes in the mobility and bioavailability of metals with potential consequences on ecosystem health. In this study, the performance of rhamnolipid (RL) coated nanoscale zero-valent iron (NZVI) in immobilizing cadmium (Cd) and lead (Pb) from contaminated river sediments was investigated. We demonstrated that RNZVI was effective in transforming labile Cd and Pb to stable fraction (the maximum residual percentage of Cd and Pb increased by 56...
June 15, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28806516/scalable-and-facile-preparation-of-highly-stretchable-electrospun-pedot-pss-pu-fibrous-nonwovens-towards-wearable-conductive-textile-applications
#6
Yichun Ding, Wenhui Xu, Wenyu Wang, Hao Fong, Zhengtao Zhu
Flexible and stretchable conductive textiles are highly desired for potential applications in wearable electronics. This study demonstrates a scalable and facile preparation of all-organic nonwoven that is mechanically stretchable and electrically conductive. Polyurethane (PU) fibrous nonwoven is prepared via the electrospinning technique; in the following step, the electrospun PU nonwoven is dip-coated with the conducting polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). This simple method enables convenient preparation of PEDOT:PSS@PU nonwovens with initial sheet resistance in the range of 35~240 Ω/ sq (i...
August 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28806422/silver-nanoparticles-as-a-control-agent-against-facades-coated-by-aerial-algae-a-model-study-of-apatococcus-lobatus-green-algae
#7
Paulina Nowicka-Krawczyk, Joanna Żelazna-Wieczorek, Tomasz Koźlecki
Aerial algae are an important biological factor causing the biodegradation of building materials and facades. Conservation procedures aimed at the protection of historic and utility materials must be properly designed to avoid an increase of the degradation rate. The aim of the present study was to investigate the effect of silver nanoparticles (AgNP) synthetized with features contributing to the accessibility and toxicity (spherical shape, small size) on the most frequently occurring species of green algae in aerial biofilms and thus, the most common biodegradation factor-Apatococcus lobatus...
2017: PloS One
https://www.readbyqxmd.com/read/28806065/synthesis-characterization-and-selective-delivery-of-darpin-gold-nanoparticle-conjugates-to-cancer-cells
#8
Sergey Deyev, Galina Proshkina, Anastasiya Ryabova, Francesco Tavanti, Maria Cristina Menziani, Gennady Eidelshtein, Gabriel Avishai, Alexander B Kotlyar
We demonstrate that the designed ankyril repeat protein (DARPin) _9-29, which specifically targets human epidermal growth factor receptor 2 (HER 2), binds tightly to gold nanoparticles (GNPs). Binding of the protein strongly increases the colloidal stability of the particles. The results of experimental analysis and molecular dynamics simulations show that approximately 35 DARPin _9-29 molecules are bound to the surface of a 5 nm GNP and that the binding does not involve the receptor-binding domain of the protein...
August 14, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28805869/wrinkle-stabilized-metal-graphene-hybrid-fibers-with-zero-temperature-coefficient-of-resistance
#9
Bo Fang, Jiabin Xi, Yingjun Liu, Fan Guo, Zhen Xu, Weiwei Gao, Daoyou Guo, Peigang Li, Chao Gao
The interfacial adhesion between graphene and metals is poor, as metals tend to generate superlubricity on smooth graphene surface. This problem renders the free assembly of graphene and metals to be a big challenge, and therefore, some desired conducting properties (e.g., stable metal-like conductivities in air, lightweight yet flexible conductors, and ultralow temperature coefficient of resistance, TCR) likely being realized by integrating the merits of graphene and metals remains at a theoretical level. This work proposes a wrinkle-stabilized approach to address the poor adhesion between graphene surface and metals...
August 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28805859/thermo-responsive-molecularly-imprinted-sensor-based-on-the-surface-enhanced-raman-scattering-for-selective-detection-of-r6g-in-the-water
#10
Hongji Li, Xiaonan Wang, Zirun Wang, Jiaqi Jiang, Maobin Wei, Jiahong Zheng, Yongsheng Yan, Chunxiang Li
In this study, a novel SERS sensor was successfully prepared by combining a molecular imprinted technique (MIT) with a SERS technique to improve the selectivity of the traditional SERS technique. Moreover, a thermo-sensitive technique was also introduced to confer stimuli-responsive properties to the materials. In a typical procedure, the Ag nanoparticles (NPs) were reduced on the surface of ZnO nanorods (NRs), and the ZnO/Ag heterostructures were used as the SERS substrates. Subsequently, a layer of thermo-sensitive imprinted polymer was coated on the surface of ZnO/Ag heterostructures to prepare the thermoresponsive ZnO/Ag/molecularly imprinted polymers (ZOA-TMIPs) by precipitation polymerization...
August 14, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28805778/-metal-self-expanding-stents-for-malignant-obstruction-of-stomach-outlet-and-duodenum
#11
A V Shabunin, S S Lebedev, G M Chechenin, Yu V Barinov, Yu V Sidorova, Z A Bagateliya, A V Vardanyan, D D Dolidze
AIM: To compare different types of self-expanding stents (partially coated or uncovered) for malignant pyloroduodenal obstruction (MPDO). MATERIAL AND METHODS: 89 MPDO patients underwent stenting at the Botkin City Hospital (Moscow) for the period 2008-2016. The causes of malignant obstruction were: stomach cancer - 53 (59.5%), pancreatic cancer - 31 (34.8%), compression by retroperitoneal lymph nodes - 3 (3.4%), duodenal cancer - 2 (2.2%). Patients were divided into two homogeneous groups...
2017: Khirurgiia
https://www.readbyqxmd.com/read/28805706/waveguide-plasmon-resonance-of-arrayed-metallic-nanostructures-patterned-on-a-soft-substrate-by-direct-contact-printing-lithography
#12
Wei-Xiang Su, Chun-Ying Wu, Yung-Chun Lee
This paper presents a direct contact printing method to obtain arrayed metallic nanostructures on a soft polymer substrate. It utilizes a polydimethylsiloxane (PDMS) mold replicated from silicon molds to transfer metallic nanopatterns onto a polymer substrate based on differences in interfacial bonding energy. Arrayed metallic nanodisks with a disk diameter down to 180 nm and a center-to-center pitch around 400 nm are experimentally patterned on a PET substrate. The patterned metallic nanostructures are then spin-coated with a polymer layer; which mechanically secures the patterned nanostructures and optically allows waveguide plasmon resonance being excited by incident EM waves...
August 13, 2017: Sensors
https://www.readbyqxmd.com/read/28805509/enhanced-cell-killing-and-apoptosis-of-oral-squamous-cell-carcinoma-cells-with-ultrasound-in-combination-with-cetuximab-coated-albumin-microbubbles
#13
Kyoichi Narihira, Akiko Watanabe, Hong Sheng, Hitomi Endo, Loreto B Feril, Yutaka Irie, Koichi Ogawa, Seyedeh Moosavi-Nejad, Seiji Kondo, Toshihiro Kikuta, Katsuro Tachibana
Targeted microbubbles has the potential to be used for ultrasound (US) therapy and diagnosis of various cancers. In the present study, US was irradiated to oral squamous cell carcinoma cells (HSC-2) in the presence of cetuximab coated albumin microbubbles (CCAM). Cell killing rate with ultrasound treatment at 0.9W/cm(2) and 1.0W/cm(2) in the presence of CCAM was greater compared to non-targeted albumin microbubbles (p < 0.05). On the other hand, selective cell killing was not observed in human myelomonocytic lymphoma cell line (U937) that had no affinity to cetuximab...
August 14, 2017: Journal of Drug Targeting
https://www.readbyqxmd.com/read/28805228/highly-dispersed-tio2-nanoparticles-with-abundant-active-sites-induced-by-surfactants-as-a-prominent-substrate-for-sers-charge-transfer-contribution
#14
Libin Yang, Di Yin, Yu Shen, Ming Yang, Xiuling Li, Xiaoxia Han, Xin Jiang, Bing Zhao
In this study, highly-dispersed TiO2 nanoparticles (NPs) with abundant active sites were synthesized by a simple sol-hydrothermal method with the assistance of surfactant polyethylene glycol (PEG) which served as an effective SERS-active substrate for the first time. The observed considerable SERS enhancement of 4-mercaptobenzoic acid (4-MBA) probe molecules on TiO2 NPs is attributed to the contribution of the charge transfer mechanism from the substrate to the probe molecule. It is suggested that PEG can act as a protective agent in the reductive calcination of the surfactant-coated nanocrystallite and consequently brings about abundant surface oxygen vacancies for TiO2 NPs, which provide more effective sites for the adsorption of probe molecules and promote the charge transfer effect and its consequent SERS enhancement...
August 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28805217/mixed-emulsion-of-liquid-crystal-microresonators-towards-white-laser-systems
#15
Gia Petriashvili, Maria Penelope De Santo, Raul Josue Hernandez, Riccardo Barberi, Gabriella Cipparrone
Microdroplet systems have attracted great interest because of their wide range of applications, easiness in processing and handling, feasibility in developing miniaturized devices with high performances and large flexibility. In this study, a stable emulsion based on different dye-doped chiral liquid crystal droplets has been engineered in order to achieve simultaneous omnidirectional lasing at different wavelengths. To obtain the mixed emulsion of dye doped Bragg onion-type microresonators the twofold action, as a surfactant and a droplet stabilizer, of the polyvinyl alcohol dissolved in water has been exploited...
August 14, 2017: Soft Matter
https://www.readbyqxmd.com/read/28805213/oxalate-assisted-formation-of-uniform-carbon-confined-sno2-nanotubes-with-enhanced-lithium-storage
#16
Chunhua Han, Baoxuan Zhang, Kangning Zhao, Jiashen Meng, Qiu He, Pan He, Wei Yang, Qi Li, Liqiang Mai
SnO2 nanotubes are synthesized via an oxalate-assisted "redox etching and precipitating" route between MnOOH nanowires and Sn(2+) ions. The addition of oxalate is found to be crucial to guide the formation of uniform SnO2 nanotubes. To further improve the conductivity and stability, the as-obtained SnO2 nanotubes are coated with a thin carbon layer. The resulting carbon-confined SnO2 nanotubes possess superior rate performance as an anode material for lithium-ion batteries.
August 14, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28805055/ph-induced-switchable-superwettability-of-efficient-antibacterial-fabrics-for-durable-selective-oil-water-separation
#17
Yuchen Fu, Biyu Jin, Qinghua Zhang, Xiaoli Zhan, Fengqiu Chen
The superhydrophobic antibacterial fabrics with intelligent switchable wettability were fabricated by the crosslink reaction among pH-responsive antibacterial copolymer tethered hydroxyl groups, methylol-contained poly(ureaformaldehyde) nanoparticles (PUF NPs) and hexamethylene diisocyanate. It was found that the surface concentration of N+ were heavily influenced by acid solutions, resulting in the rapid wettability conversion from superhydrophobicity/superoleophilicity to superhydrophilicity/underwater superoleophobicity in remarkably short time...
August 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28805046/electroenhanced-antimicrobial-coating-based-on-conjugated-polymers-with-covalently-coupled-silver-nanoparticles-prevents-staphylococcus-aureus-biofilm-formation
#18
Salvador Gomez-Carretero, Rolf Nybom, Agneta Richter-Dahlfors
The incidence of hospital-acquired infections is to a large extent due to device-associated infections. Bacterial attachment and biofilm formation on surfaces of medical devices often act as seeding points of infection. To prevent such infections, coatings based on silver nanoparticles (AgNPs) are often applied, however with varying clinical success. Here, the traditional AgNP-based antibacterial technology is reimagined, now forming the base for an electroenhanced antimicrobial coating. To integrate AgNPs in an electrically conducting polymer layer, a simple, yet effective chemical strategy based on poly(hydroxymethyl 3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT-MeOH:PSS) and (3-aminopropyl)triethoxysilane is designed...
August 14, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28805042/fabrication-and-characterization-of-electrospun-laminin-functionalized-silk-fibroin-poly-ethylene-oxide-nanofibrous-scaffolds-for-peripheral-nerve-regeneration
#19
Mina Rajabi, Masoumeh Firouzi, Zahra Hassannejad, Ismaeil Haririan, Payam Zahedi
The peripheral nerve regeneration is still one of the major clinical problems, which has received a great deal of attention. In this study, the electrospun silk fibroin (SF)/poly(ethylene oxide) (PEO) nanofibrous scaffolds were fabricated and functionalized their surfaces with laminin (LN) without chemical linkers for potential use in the peripheral nerve tissue engineering. The morphology, surface chemistry, thermal behavior and wettability of the scaffolds were examined to evaluate their performance by means of scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC) and water contact angle (WCA) measurements, respectively...
August 14, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28804994/neutron-activatable-needles-for-radionuclide-therapy-of-solid-tumors
#20
Junghyun Kim, Roger J Narayan, Xiuling Lu, Michael Jay
Various approaches have been undertaken to enhance the delivery of therapeutic agents, including tissue-killing radionuclides, into solid tumors. Here we describe the preparation of conical needles composed of Ti and Mo coated by pulsed laser deposition or chemical vapor deposition with elements (Ho and Re) that can readily yield radioactive isotopes following irradiation in a neutron flux. The radioactive needles, whose design were based on solid microneedle arrays used in transdermal drug delivery, can be produced with minimal handling of radioactivity and subsequently inserted into tumors as a means of internal radiation therapy...
August 14, 2017: Journal of Biomedical Materials Research. Part A
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