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https://www.readbyqxmd.com/read/29676819/co2-assisted-conversion-of-crystal-two-dimensional-molybdenum-oxide-to-amorphism-with-plasmon-resonances
#1
Wei Liu, Qun Xu
Localized surface plasmon resonances (LSPRs) of ultra-thin two-dimensional (2D) nanomaterials opened a new regime in plasmonics in the last several years. 2D plasmonic materials are yet concentrated on the crystal structure, amorphous materials are hardly reported because of their limited preparation methods rather than undesired plasmonic properties. Taking molybdenum oxides as an example, herein, we elaborate the 2D amorphous plasmons prepared with the assistance of supercritical CO2. In brief, we examine the reported characteristic plasmonic properties of molybdenum oxides, and applications of supercritical CO2 in formations of 2D layer materials as well as introduced phase and disorder engineering based on our researchs...
April 20, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29676147/a-highly-sensitive-photoelectrochemical-assay-with-donor-acceptor-type-material-as-photoactive-material-and-polyaniline-as-signal-enhancer
#2
Tao Hu, Ying-Ning Zheng, Meng-Jie Li, Wen-Bin Liang, Yaqin Chai, Ruo Yuan
In this work, a highly sensitive photoelectrochemical (PEC) assay was constructed based on a donor-acceptor (D-A)-type material poly{4,8-bis[5-(2-ethylhexyl) thiophen-2-yl]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl)-carbonyl]thieno[3,4-b]thiophene-4,6-diyl} (PTB7-Th) as photoactive material and polyaniline (PANI) in-situ deposited on the surface of PTB7-Th as signal enhancer. Initially, PTB7-Th that contains an electron-rich unit as donor and an electron-deficient unit as acceptor with the easy separation of electron-hole pairs and intermolecular electron transfer provided an excellent photocurrent response...
April 20, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29676129/-rapidly-identify-oligosaccharides-in-morinda-officinalis-by-uplc-q-tof-mse
#3
Qing-Xiu Hao, Li-Ping Kang, Shou-Dong Zhu, Yi Yu, Ming-Hua Hu, Fang-Li Ma, Jie Zhou, Lan-Ping Guo
In this paper, an approach was applied for separation and identification of oligosaccharides in Morinda officinalis How by Ultra performance liquid chromatography/quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF-MS) with collision energy. The separation was carried out on an ACQUITY UPLC BEH Amide C₁₈(2.1mm×100 mm,1.7 μm) with gradient elution using acetonitrile(A) and water(B) containing 0.1% ammonia as mobile phase at a flow rate of 0.2 mL·min⁻¹. The column temperature was maintained at 40 °C...
March 2018: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29676122/-quality-control-of-guci-tablets-using-uplc-elsd-fingerprint-analysis-coupled-with-chemometrics
#4
Ya-Dan Wang, Zhong Dai, Cai-Lin Sun, Xian-Fu Wu, Shuang-Cheng Ma
Ultra-performance liquid chromatography-evaporative light scattering detection (UPLC-ELSD) fingerprint analysis method was established for quality control of Guci tablets. Chromatographic separation was performed on Waters Acquity UPLC BEH C₁₈ column (2.1 mm×100 mm, 1.7 μm) at 30 °C of column temperature. Acetonitrile-0.1% formic acid solution was adopted as mobile phase for gradient elution. The flow rate was set at 0.3 mL·min⁻¹, and the injection volume was 3 μL. Detection was carried out on an ELSD with a nitrogen pressure of 0...
March 2018: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29676080/-quality-evaluation-of-medicinal-herb-decoction-forsythiae-fructus
#5
Jiao Xu, Jung Chao, Yun-Tao Dai, Chao Zhu, Qi Li, Tomoda Takehisa, Dan-Dan Wang, Shi-Lin Chen
To establish the quality control methods for the standard decoction of Forsythiae Fructus. Twelve batches of representative Forsythiae Fructus were collected to prepare standard decoction of Forsythiae Fructus, and then the parameters such as extraction ratio, transfer rate of the index components and pH value of the solution were calculated to evaluate the stability of the process. The simultaneous determination method of target components and fingerprint method were established, and ultra performance liquid chromatography-quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF-MS) was used to identify the main common peaks in the fingerprint to clarify the main chemical constituents in the decoction...
March 2018: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29676079/-quality-evaluation-of-rhei-radix-et-rhizoma-decoction
#6
Man-Jia Zhao, Jung Chao, Yun-Tao Dai, Shi-Lin Chen, Qi Li, Zi-Quan Fan, Dan-Dan Wang, Takehisa Tomoda
Decoction of single medicinal herb is a reference for the standardization of different dosage forms of Chinese medicine and it provides a new direction for solving the problems existing in the quality of Chinese medicinal granules such as no uniform dosage form and no clear quality standard. In this paper, the quality evaluation method of standard decoction of rhubarb was established to provide reference for the quality control of common dosage forms such as clinical decoction and formula granule. 10 batches of representative Rhei Radix et Rhizoma were collected to establish UPLC fingerprints were established...
March 2018: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29675708/magnetic-ionic-liquid-based-dispersive-liquid-liquid-microextraction-technique-for-preconcentration-and-ultra-trace-determination-of-cd-in-honey
#7
Emiliano F Fiorentini, Leticia B Escudero, Rodolfo G Wuilloud
A simple, highly efficient, batch, and centrifuge-less dispersive liquid-liquid microextraction method based on a magnetic ionic liquid (MIL-DLLME) and electrothermal atomic absorption spectrometry (ETAAS) detection was developed for ultra-trace Cd determination in honey. Initially, Cd(II) was chelated with ammonium diethyldithiophosphate (DDTP) at pH 0.5 followed by its extraction with the MIL trihexyl(tetradecyl)phosphonium tetrachloroferrate(III) ([P6,6,6,14 ]FeCl4 ) and acetonitrile as dispersant. The MIL phase containing the analyte was separated from the aqueous phase using only a magnet...
April 19, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29675707/a-rapid-solution-based-method-for-determining-the-affinity-of-heroin-hapten-induced-antibodies-to-heroin-its-metabolites-and-other-opioids
#8
Oscar B Torres, Alexander J Duval, Agnieszka Sulima, Joshua F G Antoline, Arthur E Jacobson, Kenner C Rice, Carl R Alving, Gary R Matyas
We describe for the first time a method that utilizes microscale thermophoresis (MST) technology to determine polyclonal antibody affinities to small molecules. Using a novel type of heterologous MST, we have accurately measured a solution-based binding affinity of serum antibodies to heroin which was previously impossible with other currently available methods. Moreover, this mismatch approach (i.e., using a cross-reactive hapten tracer) has never been reported in the literature. When compared with equilibrium dialysis combined with ultra-performance liquid chromatography/tandem mass spectrometry (ED-UPLC/MS/MS), this novel MST method yields similar binding affinity values for polyclonal antibodies to the major heroin metabolites 6-AM and morphine...
April 19, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29675544/biodegradation-of-pendimethalin-by-paracoccus-sp-p13
#9
Haiyan Ni, Na Li, Jiguo Qiu, Qing Chen, Jian He
In this study, a bacterial strain P13 capable of degrading pendimethalin was isolated from the soil of a fruit garden. Based on observed cellular morphology and physiology characteristics and a phylogenetic analysis of 16S rRNA gene sequences, strain P13 was identified as a member of the genus Paracoccus. Strain P13 grew on pendimethalin as the sole carbon source, and could degrade 100 mg/L pendimethalin within 2 days and 200 mg/L pendimethalin within 5 days. Pendimethalin degradation was proposed to be initiated by oxidation ring cleavage to yield 1,3-dinitro-2-(pentan-3-ylamino)butane-1,4-diol, an alkane organic compound that was identified by ultra-high performance liquid chromatography coupled to tandem mass spectrometry (UHPLC-MS/MS), which then underwent a series of enzymatic reactions to produce CO2 and H2 O...
April 19, 2018: Current Microbiology
https://www.readbyqxmd.com/read/29675297/minimally-invasive-multimode-optical-fiber-microendoscope-for-deep-brain-fluorescence-imaging
#10
Shay Ohayon, Antonio Caravaca-Aguirre, Rafael Piestun, James J DiCarlo
A major open challenge in neuroscience is the ability to measure and perturb neural activity in vivo from well defined neural sub-populations at cellular resolution anywhere in the brain. However, limitations posed by scattering and absorption prohibit non-invasive multi-photon approaches for deep (>2mm) structures, while gradient refractive index (GRIN) endoscopes are relatively thick and can cause significant damage upon insertion. Here, we present a novel micro-endoscope design to image neural activity at arbitrary depths via an ultra-thin multi-mode optical fiber (MMF) probe that has 5-10X thinner diameter than commercially available micro-endoscopes...
April 1, 2018: Biomedical Optics Express
https://www.readbyqxmd.com/read/29675243/electronic-modulation-of-transition-metal-phosphide-via-doping-as-efficient-and-ph-universal-electrocatalysts-for-hydrogen-evolution-reaction
#11
Xin Xiao, Leiming Tao, Man Li, Xiaowei Lv, Dekang Huang, Xingxing Jiang, Haiping Pan, Mingkui Wang, Yan Shen
It is highly desirable to develop efficient and low-cost catalysts to minimize the overpotential of the hydrogen evolution reaction (HER) for large-scale hydrogen production from electrochemical water splitting. Doping a foreign element into the host catalysts has been proposed as an effective approach to optimize the electronic characteristics of catalysts and thus improve their electrocatalytic performance. Herein we, for the first time, report vanadium-doped CoP on self-supported conductive carbon cloth (V-CoP/CC) as a robust HER electrocatalyst, which achieves ultra-low overpotentials of 71, 123 and 47 mV to afford a current density of 10 mA cm-2 in 1 M KOH, 1 M PBS and 0...
February 21, 2018: Chemical Science
https://www.readbyqxmd.com/read/29674781/towards-understanding-the-microstructural-and-structural-changes-in-natural-hierarchical-materials-for-energy-recovery-in-operando-multi-scale-x-ray-scattering-characterization-of-na-and-ca-montmorillonite-on-heating-to-1150-%C3%A2-c
#12
Greeshma Gadikota, Fan Zhang, Andrew J Allen
Understanding the changes in the microstructures and structures of clays with varying intercalated metal ions at elevated temperatures is of importance for many applications ranging from the recovery of shale gas from unconventional formations to developing effective nuclear waste containment technologies, and engineering materials such as ceramics for fuel cell applications. In this study, synchrotron-based in-operando multi-scale X-ray scattering analyses are used to determine dynamic microstructural and crystal structural changes in Na- and Ca-montmorillonite on heating from 30 °C to 1150 °C...
May 2017: Fuel
https://www.readbyqxmd.com/read/29674032/reliable-determination-of-new-lipid-peroxidation-compounds-as-potential-early-alzheimer-disease-biomarkers
#13
Ana García-Blanco, Carmen Peña-Bautista, Camille Oger, Claire Vigor, Jean-Marie Galano, Thierry Durand, Nuria Martín-Ibáñez, Miguel Baquero, Máximo Vento, Consuelo Cháfer-Pericás
Lipid peroxidation plays an important role in Alzheimer Disease, so corresponding metabolites found in urine samples could be potential biomarkers. The aim of this work is to develop a reliable ultra-performance liquid chromatography-tandem mass spectrometry analytical method to determine a new set of lipid peroxidation compounds in urine samples. Excellent sensitivity was achieved with limits of detection between 0.08 and 17 nmol L-1 , which renders this method suitable to monitor analytes concentrations in real samples...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29673996/production-of-r-r-2-3-butanediol-of-ultra-high-optical-purity-from-paenibacillus-polymyxa-zj-9-using-homologous-recombination
#14
Li Zhang, Can Cao, Ruifan Jiang, Hong Xu, Feng Xue, Weiwei Huang, Hao Ni, Jian Gao
The present study describes the use of metabolic engineering to achieve the production of R,R-2,3-butanediol (R,R-2,3-BD) of ultra-high optical purity (>99.99%). To this end, the diacetyl reductase (DAR) gene (dud A) of Paenibacillus polymyxa ZJ-9 was knocked out via homologous recombination between the genome and the previously constructed targeting vector pRN5101-L'C in a process based on homologous single-crossover. PCR verification confirmed the successful isolation of the dud A gene disruption mutant P...
April 11, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29673893/a-new-discrete-dipole-kernel-for-quantitative-susceptibility-mapping
#15
Carlos Milovic, Julio Acosta-Cabronero, José Miguel Pinto, Hendrik Mattern, Marcelo Andia, Sergio Uribe, Cristian Tejos
PURPOSE: Most approaches for quantitative susceptibility mapping (QSM) are based on a forward model approximation that employs a continuous Fourier transform operator to solve a differential equation system. Such formulation, however, is prone to high-frequency aliasing. The aim of this study was to reduce such errors using an alternative dipole kernel formulation based on the discrete Fourier transform and discrete operators. METHODS: The impact of such an approach on forward model calculation and susceptibility inversion was evaluated in contrast to the continuous formulation both with synthetic phantoms and in vivo MRI data...
April 16, 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29671324/discovery-of-lipidome-alterations-following-traumatic-brain-injury-via-high-resolution-metabolomics
#16
Scott R Hogan, John H Phan, Melissa Alvarado-Velez, May Dongmei Wang, Ravi V Bellamkonda, Facundo M Fernandez, Michelle C LaPlaca
Traumatic brain injury (TBI) can occur across wide segments of the population, presenting in a heterogeneous manner that makes diagnosis inconsistent and management challenging. Biomarkers offer the potential to objectively identify injury status, severity, and phenotype by measuring the relative concentrations of endogenous molecules in readily accessible biofluids. Through a data-driven, discovery approach, novel biomarker candidates for TBI were identified in the serum lipidome of adult male Sprague-Dawley rats in the first week following moderate controlled cortical impact (CCI)...
April 19, 2018: Journal of Proteome Research
https://www.readbyqxmd.com/read/29671321/a-comparative-metabolomics-approach-detects-stress-specific-responses-during-coral-bleaching-in-soft-corals
#17
Mohamed A Farag, Achim Meyer, Sara E Ali, Mohamed A Salem, Patrick Giavalisco, Hildegard Westphal, Ludger A Wessjohann
Chronic exposure to ocean acidification and elevated sea-surface temperatures pose significant stress to marine ecosystems. This in turn necessitates costly acclimation responses in corals in both the symbiont and host, with a re-organization of cell metabolism and structure. A large-scale untargeted metabolomics approach comprising gas chromatography mass spectrometry (GC-MS) and ultra performance liquid chromatography coupled to high resolution mass spectrometry (UPLC-MS) was applied to profile the metabolite composition of the soft coral Sarcophyton ehrenbergi and its dinoflagellate symbiont...
April 19, 2018: Journal of Proteome Research
https://www.readbyqxmd.com/read/29671312/a-flexible-polymer-ultra-fine-fiber-with-extreme-toughness
#18
Guangliang Zhou, Guang Yang, Xilin Li, Baiyi Chen, Jing Fan, Xu Hou, Shaobing Zhou
Fiber materials with multilevel interior structures have myriad applications in many fields due to their unique properties. In this study, we develop a bio-inspired flexible ultra-fine polymer fiber via an integrated microfluidic-electrospinning technology. The fiber possesses periodic hollow and tubular chambers with a shell layer of approximately 150 nm in thickness extremely like natural bamboo. The single fiber with a diameter of ~1.5 µm exhibits the Young's modulus ranging from 2-7 MPa measured with atomic force microscopy (AFM)...
April 19, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29671195/aflatoxin-m-1-contamination-of-raw-cow-s-milk-in-five-regions-of-kosovo-during-2016
#19
Arieta Camaj, Karsten Meyer, Bajram Berisha, Tahir Arbneshi, Arben Haziri
During February and August 2016 (winter and summer season), 192 samples of raw bulk tank milk have been collected from small dairy farms in five different regions of Kosova (Prishtina, Prizren, Peja, Mitrovica, and Gjilan). These samples were analyzed for aflatoxin M1 (AFM1 ) contamination level by ultra-high performance liquid chromatography coupled with electrospray ionization triple quadrupole tandem mass spectrometry (UHPLC-ESI-MS/MS). The limit of quantification for AFM1 was 0.02 μg/L and recovery at 0...
April 18, 2018: Mycotoxin Research
https://www.readbyqxmd.com/read/29671029/rapid-and-sensitive-determination-of-nine-bisphenol-analogues-three-amphenicol-antibiotics-and-six-phthalate-metabolites-in-human-urine-samples-using-uhplc-ms-ms
#20
Yuan Yao, Yijun Shao, Ming Zhan, Xiaoli Zou, Weidong Qu, Ying Zhou
Bisphenol analogues, amphenicol antibiotics, and phthalate have widely aroused public concerns due to their adverse effects on human health. In this study, a rapid and sensitive method for determination of nine bisphenol analogues, three amphenicol antibiotics, and six phthalate metabolites in the urine based on ultra-high-performance liquid chromatography coupled with triple quadrupole tandem mass spectrometry was developed and validated. The sample pretreatment condition on the base of mixed-mode anion-exchange (Oasis MAX) SPE was optimized to separate bisphenol analogues and amphenicol antibiotics from phthalate metabolites: the former were detected with a mobile phase of 0...
April 19, 2018: Analytical and Bioanalytical Chemistry
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