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Raman spectroscopic investigations on transition‐metal dichalcogenides MX 2 (M = Mo, W; X = S, Se) at high pressures and low temperature

Published: Sep 19, 2014

Author(s): Sandip V. Bhatt, M. P. Deshpande, Vasant Sathe, Rekha Rao, S. H. Chaki

Journal: Journal of Raman Spectroscopy

Transition‐metal dichalcogenides have been investigated using Raman spectroscopy both being off‐resonance and in resonance. The first‐order Raman spectra of MoS2, MoSe2, WS2 and WSe2 single crystal synthesized by vapor transport technique have been studied as a function of hydrostatic pressure (0–20 GPa) and temperature (80–300 K). Isobaric and isothermal mode‐Grüneisen parameters have been determined from the temperature and ...

Read More thumbnail image: Raman spectroscopic investigations on transitionmetal dichalcogenides MX 2 MMo W XS Se at high pressures and low temperature

Micro‐Raman spectroscopy and ancient ceramics: applications and problems

Published: Sep 19, 2014

Author(s): Laura Medeghini, Pier Paolo Lottici, Caterina De Vito, Silvano Mignardi, Danilo Bersani

Journal: Journal of Raman Spectroscopy

Micro‐Raman spectroscopy is applied for the study of two classes of ancient ceramic artefacts showing different features and technological background, i.e. the fine‐grain Black Gloss Ware from Motya (Sicily, Italy) and the coarse‐grain pottery from Khirbet al‐Batrawy (Jordan). The characterization of the mineralogical composition of these ceramics allows exploring the firing conditions and the manufacturing process. In particular, μ‐Raman...

Read More thumbnail image: MicroRaman spectroscopy and ancient ceramics applications and problems

Resonance Raman spectroscopic study of shape‐induced phase transition in CdSe nanoclusters

Published: Sep 19, 2014

Author(s): Sandip Dhara, Chuan‐Pu Liu, Shu‐Fang Chen, Andrei A. Eliseev, Dmitry I. Petukhov

Journal: Journal of Raman Spectroscopy

We report an observation of shape‐induced phase transition from wurtzite to zinc blende phase of encapsulated CdSe nanoclusters in mesoporous silica. Presence of both the phases is also observed in the as‐grown sample before encapsulation. Role of interfacial energy in the energetic mesopores, as the possible origin of phase transition, is thus ruled out, as the samples are encapsulated subsequent to their synthesis in the soft chemistry...

Read More thumbnail image: Resonance Raman spectroscopic study of shapeinduced phase transition in CdSe nanoclusters

Disposition and metabolic profile of the weak androgen Dehydroepiandrosterone (DHEA) following administration as part of a nutritional supplement to exercised horses

Published: Sep 19, 2014

Author(s): H.K. Knych, R.M. Arthur, S.D. Stanley, D.S. McKemie

Journal: Drug Testing and Analysis

In order to ensure the welfare of performance horses and riders as well as the integrity of the sport, the use of both therapeutic and illegal agents in horse racing is tightly regulated. While Dehydroepiandrosterone (DHEA) is not specifically banned from administration to racehorses in the United States and no screening limit or threshold concentration exists, the metabolic conversion of DHEA to testosterone make its presence in...

Read More thumbnail image: Disposition and metabolic profile of the weak androgen Dehydroepiandrosterone DHEA following administration as part of a nutritional supplement to exercised horses

Using imaging ToF‐SIMS data to determine the cell wall thickness of fibers in wood

Published: Sep 19, 2014

Author(s): Lorenz Gerber, Viet Mai Hoang, Linh Tran, Hoang Anh Tuan Kiet, Per Malmberg, Jörg Hanrieder, Andrew Ewing

Journal: Surface and Interface Analysis

Here, we demonstrate the use of time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) imaging data for estimation of cell wall thickness in wood samples. Current research in forest biotechnology focuses on transgenic trees with wood properties tailored to specific applications. Appropriate analytical methods to characterize the very heterogeneous wood material are constantly being developed and improved. Chemical imaging of wood by...

Read More thumbnail image: Using imaging ToFSIMS data to determine the cell wall thickness of fibers in wood

Application of an optimized dispersive nanomaterial ultrasound‐assisted microextraction method for preconcentration of carbofuran and propoxur and their determination by high‐performance liquid chromatography with UV detection

Published: Sep 18, 2014

Author(s): Saeid Khodadoust, Mohammad Sharif Talebianpoor, Mehrorang Ghaedi

Journal: Journal of Separation Science

An extraction method based on dispersive nanomaterial ultrasound‐assisted microextraction was used for the preconcentration of carbofuran and propoxur insecticides in water samples prior to high‐performance liquid chromatography with UV detection. ZnS:Ni nanoparticles were synthesized based on the reaction of the mixture of zinc acetate and nickel acetate with thioacetamide in aqueous media and then loaded on activated carbon (ZnS:Ni‐AC)....

Read More thumbnail image: Application of an optimized dispersive nanomaterial ultrasoundassisted microextraction method for preconcentration of carbofuran and propoxur and their determination by highperformance liquid chromatography with UV detection

Computer‐assisted design and synthesis of molecularly imprinted polymers for the simultaneous determination of six carbamate pesticides from environmental water

Published: Sep 18, 2014

Author(s): Peipei Qi, Xiangyun Wang, Xinquan Wang, Hu Zhang, Hao Xu, Kezhi Jiang, Qiang Wang

Journal: Journal of Separation Science

The computer‐assisted design and synthesis of molecularly imprinted polymers for the simultaneous capture of six carbamate pesticides from environmental water are reported in this work. The quantum mechanical computational approach was employed to design the molecularly imprinted polymers with carbofuran as template. The interaction energies between the template molecule and different functional monomers in various solvents were...

Read More thumbnail image: Computerassisted design and synthesis of molecularly imprinted polymers for the simultaneous determination of six carbamate pesticides from environmental water

Combination of a sub‐3 μm superficially porous particle packed column with charged aerosol detection for the simple and sensitive measurement of nine macrolides in human urine

Published: Sep 18, 2014

Author(s): Shaodong Jia, In Gi Song, Kyung Min Jeong, Jing Li, Jeong Hill Park, Jeongmi Lee, Sung Won Kwon

Journal: Journal of Separation Science

Due to the lack of chromophores in many macrolides, analytical methods based on mass spectrometry and electrochemical detection coupled to liquid chromatography have been suggested to be suitable for the quantification of macrolides in complex matrices. In this study, a simple and sensitive analytical method was established for the simultaneous measurement of nine macrolides in human urine by combining a sub‐3 μm superficially porous...

Read More thumbnail image: Combination of a sub3m superficially porous particle packed column with charged aerosol detection for the simple and sensitive measurement of nine macrolides in human urine

Multiresidue determination of UV filters in water samples by solid‐phase extraction and liquid chromatography with tandem mass spectrometry analysis

Published: Sep 18, 2014

Author(s): Anna Laura Capriotti, Chiara Cavaliere, Susy Piovesana, Roberto Samperi, Serena Stampachiacchiere, Salvatore Ventura, Aldo Laganà

Journal: Journal of Separation Science

UV filters, contained in sunscreens and other cosmetic products, as well as in some plastics and industrial products, are nowadays considered contaminants of emerging concern because their widespread and increasing use has lead to their presence in the environment. Furthermore, some UV filters are suspected to have endocrine disruption activity. In the present work, we developed an analytical method based on liquid chromatography with...

Read More thumbnail image: Multiresidue determination of UV filters in water samples by solidphase extraction and liquid chromatography with tandem mass spectrometry analysis

Histamine H1 receptor cell membrane chromatography online high‐performance liquid chromatography with mass spectrometry method reveals houttuyfonate as an activator of the histamine H1 receptor

Published: Sep 18, 2014

Author(s): Ying Guo, Shengli Han, Jingjing Cao, Tao Zhang, Langchong He

Journal: Journal of Separation Science

Allergy is an abnormal reaction of the body to an allergen. Histamine is responsible for many of the acute symptoms of allergic diseases. Many of the allergic and inflammatory actions of histamine are mediated by the histamine H1 receptor. In the present study, we established a two‐dimensional histamine H1 receptor/cell membrane chromatography with online high‐performance liquid chromatography and mass spectrometry method for screening...

Read More thumbnail image: Histamine H1 receptor cell membrane chromatography online highperformance liquid chromatography with mass spectrometry method reveals houttuyfonate as an activator of the histamine H1 receptor

Simultaneous determination of phenolic compounds in Equisetum palustre L. by ultra high performance liquid chromatography with tandem mass spectrometry combined with matrix solid‐phase dispersion extraction

Published: Sep 18, 2014

Author(s): Zuofu Wei, Youzhi Pan, Lu Li, Yuyang Huang, Xiaolin Qi, Meng Luo, Yuangang Zu, Yujie Fu

Journal: Journal of Separation Science

A method based on matrix solid‐phase dispersion extraction followed by ultra high performance liquid chromatography with tandem mass spectrometry is presented for the extraction and determination of phenolic compounds in Equisetum palustre. This method combines the high efficiency of matrix solid‐phase dispersion extraction and the rapidity, sensitivity, and accuracy of ultra high performance liquid chromatography with tandem mass spectrometry. The...

Read More thumbnail image: Simultaneous determination of phenolic compounds in Equisetum palustre L_ by ultra high performance liquid chromatography with tandem mass spectrometry combined with matrix solidphase dispersion extraction

Ultrasound‐enhanced and microwave‐assisted extraction of lipid from Dunaliella tertiolecta and fatty acid profile analysis

Published: Sep 18, 2014

Author(s): Xiao‐Ying Qv, Qin‐Fan Zhou, Jian‐Guo Jiang

Journal: Journal of Separation Science

Microalgal lipid is considered as a potential biodiesel resource due to its advantages compared to other bioresources. The production of biofuel from microalgae includes several stages like microalgae cultivation, biomass harvest, biomass treatment, lipid extraction, and the ultimate biodiesel synthesis. Lipid extraction is closely associated with the productivity and cost of energy production. In the present study, lipid of green algae...

Read More thumbnail image: Ultrasoundenhanced and microwaveassisted extraction of lipid from Dunaliella tertiolecta and fatty acid profile analysis

Evaluating the reliability of spectral variables selected by subsampling methods

Published: Sep 17, 2014

Author(s): Zhaozhou Lin, Xiaoning Pan, Bing Xu, Jiayu Zhang, Xinyuan Shi, Yanjiang Qiao

Journal: Journal of Chemometrics

It is imperfect to evaluate a subsampling variable selection method using only its prediction performance. To further assess the reliability of subsampling variable selection methods, dummy noise variables of different amplitudes were augmented to the original spectral data, and the false variable selection number was recorded. The reliabilities of three subsampling variable selection methods including Monte Carlo uninformative variable...

Read More thumbnail image: Evaluating the reliability of spectral variables selected by subsampling methods

Quantitative urine confirmatory testing for synthetic cannabinoids in randomly collected urine specimens

Published: Sep 17, 2014

Author(s): Marisol S. Castaneto, Karl B. Scheidweiler, Adarsh Gandhi, Ariane Wohlfarth, Kevin L. Klette, Thomas M. Martin, Marilyn A. Huestis

Journal: Drug Testing and Analysis

Synthetic cannabinoid intake is an ongoing health issue worldwide, with new compounds continually emerging, making drug testing complex. Parent synthetic cannabinoids are rarely detected in urine, the most common matrix employed in workplace drug testing. Optimal identification of synthetic cannabinoid markers in authentic urine specimens and correlation of metabolite concentrations and toxicities would improve synthetic cannabinoid...

Read More thumbnail image: Quantitative urine confirmatory testing for synthetic cannabinoids in randomly collected urine specimens

Magnetic beads as an extraction medium for simultaneous quantification of acetaminophen and structurally related compounds in human serum

Published: Sep 17, 2014

Author(s): Caroline Bylda, Vanya Velichkova, Jens Bolle, Roland Thiele, Uwe Kobold, Dietrich A. Volmer

Journal: Drug Testing and Analysis

This paper describes a sample preparation method that complements a previously published liquid chromatography‐tandem mass spectrometry (LC‐MS/MS) assay for acetaminophen and eight structurally‐related compounds in human serum (C. Bylda, R. Thiele, U. Kobold, D.A. Volmer. Drug Test. Anal. 2014, 6, 451). The analytes (acetaminophen [APAP] + metabolites acetaminophen‐glucuronide [APG], ‐cysteine [APC], ‐mercapturate [APM] and ‐cysteine...

Read More thumbnail image: Magnetic beads as an extraction medium for simultaneous quantification of acetaminophen and structurally related compounds in human serum

Pharmacokinetics of cytisine, an α 4 β 2 nicotinic receptor partial agonist, in healthy smokers following a single dose

Published: Sep 17, 2014

Author(s): Soo Hee Jeong, David Newcombe, Janie Sheridan, Malcolm Tingle

Journal: Drug Testing and Analysis

Cytisine, an α4β2 nicotinic receptor partial agonist, is a plant alkaloid that is commercially extracted for use as a smoking cessation medication. Despite its long history of use, there is very little understanding of the pharmacokinetics of cytisine. To date, no previous studies have reported cytisine concentrations in humans following its use as a smoking cessation agent. A high performance liquid chromatography‐ultraviolet (HPLC‐UV)...

Read More thumbnail image: Pharmacokinetics of cytisine an  4  2 nicotinic receptor partial agonist in healthy smokers following a single dose

Stimulated Raman spectroscopy using chirped pulses

Published: Sep 17, 2014

Author(s): Barbara Dunlap, Peter Richter, David W. McCamant

Journal: Journal of Raman Spectroscopy

We present a detailed theoretical and experimental characterization of a new methodology for stimulated Raman spectroscopy using two duplicates of a chirped, broadband laser pulse. Because of the linear variation of laser frequency with time (‘chirp’), when the pulses are delayed relative to one another, there exists a narrow bandwidth, instantaneous frequency difference between them, which, when resonant with a Raman‐active vibration in...

Read More thumbnail image: Stimulated Raman spectroscopy using chirped pulses

Origin of the variability of the mechanical properties of silk fibers: 4. Order/crystallinity along silkworm and spider fibers

Published: Sep 17, 2014

Author(s): Marine Wojcieszak, Aline Percot, Sylvie Noinville, Gwénaël Gouadec, Bernard Mauchamp, Philippe Colomban

Journal: Journal of Raman Spectroscopy

The poor crystallinity of proteic fibers has fuelled an ongoing debate over their exact organization. We present a full‐range Raman comparison of Nephila madagascariensis spider and Bombyx mori silkworm silks that sheds some new light on that matter. On the one hand, a large variability is observed along the fibers in the −200 to 200 cm−1 spectral window, which is sensitive to the long‐range order signature of polyamide chains. This questions the...

Read More thumbnail image: Origin of the variability of the mechanical properties of silk fibers 4_ Ordercrystallinity along silkworm and spider fibers

Simultaneous quantification of two steroidal glycosides after oral gavage of Marsdenia tenacissima extract in rats using a LC‐MS/MS method

Published: Sep 16, 2014

Author(s): Wei Wang, Wei Sun, Lei Dong, Xiaotong Qu, Jin Shi, Ke‐Jun Li, Bing Li, Da‐Peng Ma

Journal: Biomedical Chromatography

ABSTRACT A specific, sensitive and accurate analytical LC‐MS/MS assay was developed for the simultaneous determination of two steroidal glycosides, tenacissoside H and tenacissoside I, in rat plasma. An Agilent ZORBAX SB‐C18 column was used with an isocratic mobile phase system composed of methanol–water–formic acid (70:30:0.1, v/v/v) at a flow rate of 0.3 mL/min. The analysis was performed on a positive ionization electrospray mass...

Read More thumbnail image: Simultaneous quantification of two steroidal glycosides after oral gavage of Marsdenia tenacissima extract in rats using a LCMSMS method

Simultaneous determination of nine lignans from Schisandra chinensis extract using ultra‐performance liquid chromatography with tandem mass spectrometry in rat plasma, urine, and gastrointestinal tract samples: Application to the pharmacokinetic study of Schisandra chinensis

Published: Sep 16, 2014

Author(s): You‐Jin Kim, Hee Ju Lee, Chul Young Kim, Sun‐Young Han, Young‐Won Chin, Young Hee Choi

Journal: Journal of Separation Science

The fruit of Schisandra chinensis is a well‐known herbal medicine and dietary supplement due to a variety of biological activities including antihepatotoxic and antihyperlipidemic activities. However, the simultaneous validation methodology and pharmacokinetic investigation of nine lignans of S. chinensis extract in biological samples have not been proved yet. Thus, the present study was undertaken to develop the proper sample preparation...

Read More thumbnail image: Simultaneous determination of nine lignans from Schisandra chinensis extract using ultraperformance liquid chromatography with tandem mass spectrometry in rat plasma urine and gastrointestinal tract samples Application to the pharmacokinetic study of Schisandra chinensis
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