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Purity and adulterant analysis of some recent drug seizures in Italy

Published: Dec 9, 2016

Author(s): Simona Pichini, Francesco Paolo Busardò, Adolfo Gregori, Paolo Berretta, Stefano Gentili, Roberta Pacifici

Journal: Drug Testing and Analysis

Read More thumbnail image: Purity and adulterant analysis of some recent drug seizures in Italy

Capillary electrophoresis inductively coupled plasma mass spectrometry combined with metal tag for ultrasensitively determining trace saxitoxin in seafood

Published: Dec 8, 2016

Author(s): Ye He, Fan Mo, Danlong Chen, LiangJun Xu, Yongning Wu, FengFu Fu

Journal: ELECTROPHORESIS

As one of paralytic shellfish toxins, the saxitoxin (STX) in the aqueous environment can be accumulated by most shellfish, and thus harms human health through the food chain. Therefore, it is crucial to determine trace STX in seafood samples in order to ensure the safety of seafood consumption. In this study, we developed a novel indirect method for ultrasensitively determining trace STX in seafood by using CE‐ICP‐MS together with Eu3+...

Read More thumbnail image: Capillary electrophoresis inductively coupled plasma mass spectrometry combined with metal tag for ultrasensitively determining trace saxitoxin in seafood

Numerical study of the faithful replication of micro/nanostructures on curved surfaces by the electrohydrodynamic instability process

Published: Dec 8, 2016

Author(s): Hefu Li, Weixing Yu, Taisheng Wang, Zhenyu Liu, M. P. Y. Desmulliez

Journal: ELECTROPHORESIS

This paper reports the numerical study of the one‐step faithful replication of micro/nano‐scale structures on a fiber surface by using the electrohydrodynamic instability patterning (EHDIP) process. By employing a rigorous numerical analysis method, conditions are revealed under which the faithful replication of a pattern can be achieved from a curved master electrode. It is found that the radius of curvature of the fiber plays an...

Read More thumbnail image: Numerical study of the faithful replication of micronanostructures on curved surfaces by the electrohydrodynamic instability process

HPTLC and magnetochromatography of new complexes of carboxylates with transition metals or rare earth elements and their ligands – study of lipophilicity

Published: Dec 5, 2016

Author(s): Irena Malinowska, Agnieszka Wronka, Wiesława Ferenc

Journal: Biomedical Chromatography

Abstract Nineteen new complexes of carboxylates with transition and rare elements as central ions and their ligands were characterized by chromatographic analyses. The parameter of relative lipophilicity (RM0) of the tested compounds was determined experimentally by the reversed‐phase high‐performance thin layer chromatography method with mixtures of various organic modifiers (acetonitrile, acetone, dioxane) and water as a mobile phase. The...

Read More thumbnail image: HPTLC and magnetochromatography of new complexes of carboxylates with transition metals or rare earth elements and their ligands  study of lipophilicity

Hydrophilic interaction chromatography with Fourier transform mass spectrometry of monosaccharide anhydrides

Published: Dec 2, 2016

Author(s): David Matějíček, Jana Vašíčková

Journal: Journal of Separation Science

A fast, selective, and sensitive method for the determination of three monosaccharide anhydrides (galactosan, mannosan, levoglucosan), based on hydrophilic interaction chromatography and Fourier transform mass spectrometry, was successfully developed. The simple experimental stationary phase and mass spectrometry performance screening allowed the selection of the best available chromatographic and mass spectrometry conditions. Thus, the...

Read More thumbnail image: Hydrophilic interaction chromatography with Fourier transform mass spectrometry of monosaccharide anhydrides

On the effect of dead time on the counting statistical error

Published: Dec 2, 2016

Author(s): Bruno Vrebos, Charalampos Zarkadas, Yannick Coquereau, Aleksandr Komelkov, Gary Pritchard, Christos Tsouris, 

Journal: X-Ray Spectrometry

In X‐ray intensity measurements, the counting statistical error is typically calculated as the square root of the number of counts collected. This, however, is an approximation in the sense that the effect of the dead time in the counting process has been ignored. In this work, the equations for calculation of the counting statistical error in X‐ray fluorescence measurements will be derived, including the effect of the dead time of the...

Read More thumbnail image: On the effect of dead time on the counting statistical error

Transmission probability and energy distribution of electrons impinging on indium thin film targets

Published: Dec 2, 2016

Author(s): M. Hannachi, Z. Rouabah, N. Bouarissa, C. Champion

Journal: Surface and Interface Analysis

Based on a home‐made Monte Carlo simulation, the electron backscattering coefficient, mean penetration depth, transmission probability, and transmission energy distribution of 1–5 keV electron normally incident penetrating in indium thin film targets have been computed. The trend of all features of interest as a function of the indium film thickness at both nanometric scale region and bulk material region has been examined and discussed....

Read More thumbnail image: Transmission probability and energy distribution of electrons impinging on indium thin film targets

The clinical utility of QSM: disease diagnosis, medical management, and surgical planning

Published: Dec 1, 2016

Author(s): Sarah Eskreis‐Winkler, Yan Zhang, Jingwei Zhang, Zhe Liu, Alexey Dimov, Ajay Gupta, Yi Wang

Journal: NMR in Biomedicine

Quantitative susceptibility mapping (QSM) is an MR technique that depicts and quantifies magnetic susceptibility sources. Mapping iron, the dominant susceptibility source in the brain, has many important clinical applications. Herein, we review QSM applications in the diagnosis, medical management, and surgical treatment of disease. To assist in early disease diagnosis, QSM can identify elevated iron levels in the motor cortex of...

Read More thumbnail image: The clinical utility of QSM disease diagnosis medical management and surgical planning

Magnetic solid‐phase extraction of angiotensin II receptor antagonists in human urine and plasma with a reversed‐phase/cation‐exchange mixed‐mode sorbent

Published: Nov 30, 2016

Author(s): Shu‐Wen Xue, Ling Luo, Li Xu

Journal: Journal of Separation Science

Biocompatible magnetic nanoparticles that featured divinylbenzene and sulfonate functionalities were used for the magnetic solid‐phase extraction of five angiotensin II receptor antagonists from human urine and plasma samples based on a reversed‐phase and cation‐exchange mixed‐mode mechanism. Under the optimized extraction conditions, coupled to high‐performance liquid chromatography with fluorescence detection, this proposed method was...

Read More thumbnail image: Magnetic solidphase extraction of angiotensin II receptor antagonists in human urine and plasma with a reversedphasecationexchange mixedmode sorbent

Recent advances and applications of gas chromatography vacuum ultraviolet spectroscopy

Published: Nov 30, 2016

Author(s): Inês C. Santos, Kevin A. Schug

Journal: Journal of Separation Science

The vacuum ultraviolet spectrophotometer was developed recently as an alternative to existing gas chromatography detectors. This detector measures the absorption of gas‐phase chemical species in the range of 120–240 nm, where all chemical compounds present unique absorption spectra. Therefore, qualitative analysis can be performed and quantification follows standard Beer–Lambert law principles. Different fields of application, such as...

Read More thumbnail image: Recent advances and applications of gas chromatography vacuum ultraviolet spectroscopy

The development of SRM assays is transforming proteomics research

Published: Nov 30, 2016

Author(s): Nathan P. Manes, Aleksandra Nita‐Lazar

Journal: PROTEOMICS

Bottom‐up targeted proteomics using SRM is a powerful analytical technology, but it requires the development of SRM assays, which is a complex procedure. Whereas proteome‐wide SRM assays have recently been developed for a small number of species, this is not so for the mouse. In this issue, Percy et al. report the development of hundreds of mouse SRM assays. Their development required shotgun MS to identify proteotypic peptides, ...

Read More thumbnail image: The development of SRM assays is transforming proteomics research

Acetylene black paste electrode modified with molecularly imprinted polymers/graphene for the determination of bisphenol A

Published: Nov 29, 2016

Author(s): Wanzhen Xu, Fei Yuan, Chunyan Li, Weihong Huang, Xiangyang Wu, Zhengqiao Yin, Wenming Yang

Journal: Journal of Separation Science

A novel nanocomposite of molecularly imprinted polymers and graphene sheets was fabricated and used to obtain a highly conductive acetylene black paste electrode with high conductivity for the detection of bisphenol A. The two‐dimensional structure and the chemical functionality of graphene provide an excellent surface for the enhancement of the sensitivity of the electrochemical sensor and the specificity of molecularly imprinted...

Read More thumbnail image: Acetylene black paste electrode modified with molecularly imprinted polymersgraphene for the determination of bisphenol A

Optimization of alcohol‐assisted dispersive liquid–liquid microextraction by experimental design for the rapid determination of fluoxetine in biological samples

Published: Nov 29, 2016

Author(s): Raheleh Hamedi, Mohammad Reza Hadjmohammadi

Journal: Journal of Separation Science

A sensitive and rapid method based on alcohol‐assisted dispersive liquid–liquid microextraction followed by high‐performance liquid chromatography for the determination of fluoxetine in human plasma and urine samples was developed. The effects of six parameters on the extraction recovery were investigated and optimized utilizing Plackett–Burman design and Box–Benken design, respectively. According to the Plackett–Burman design results,...

Read More thumbnail image: Optimization of alcoholassisted dispersive liquidliquid microextraction by experimental design for the rapid determination of fluoxetine in biological samples

Diffusion‐weighted imaging of the abdomen: Impact of b ‐values on texture analysis features

Published: Nov 29, 2016

Author(s): Anton S. Becker, Matthias W. Wagner, Moritz C. Wurnig, Andreas Boss

Journal: NMR in Biomedicine

The purpose of this work was to systematically assess the impact of the b‐value on texture analysis in MR diffusion‐weighted imaging (DWI) of the abdomen. In eight healthy male volunteers, echo‐planar DWI sequences at 16 b‐values ranging between 0 and 1000 s/mm2 were acquired at 3 T. Three different apparent diffusion coefficient (ADC) maps were computed (0, 750/100, 390, 750 s/mm2/all b‐values). Texture analysis of...

Read More thumbnail image: Diffusionweighted imaging of the abdomen Impact of b values on texture analysis features

Perfusion has no effect on the in vivo CEST effect from Cr (CrCEST) in skeletal muscle

Published: Nov 29, 2016

Author(s): Feliks Kogan, Randall B. Stafford, Erin K. Englund, Garry E. Gold, Hari Hariharan, John A. Detre, Ravinder Reddy

Journal: NMR in Biomedicine

Abstract Creatine, a key component of muscle energy metabolism, exhibits a chemical exchange saturation transfer (CEST) effect between its amine group and bulk water, which has been exploited to spatially and temporally map creatine changes in skeletal muscle before and after exercise. In addition, exercise leads to an increase in muscle perfusion. In this work, we determined the effects of perfused blood on the CEST effects from...

Read More thumbnail image: Perfusion has no effect on the in vivo CEST effect from Cr CrCEST in skeletal muscle

Identification and quantification of thymol metabolites in plasma, liver and duodenal wall of broiler chickens using UHPLC‐ESI‐QTOF‐MS

Published: Nov 29, 2016

Author(s): Jana Pisarčíková, Vladimíra Oceľová, Štefan Faix, Iveta Plachá, Angela I. Calderón

Journal: Biomedical Chromatography

Abstract In the present study, we aimed to develop a method for thymol sulfate and thymol glucuronide determination in plasma, liver and duodenal wall of broiler chickens after feeding with a Thymus vulgaris essential oil at the different concentrations (0.01, 0.05 and 0.1% w/w). UHPLC coupled with accurate‐mass QTOF‐MS was used for identification and quantification of thymol metabolites. Novel Waters Oasis Prime HLB solid‐phase extraction...

Read More thumbnail image: Identification and quantification of thymol metabolites in plasma liver and duodenal wall of broiler chickens using UHPLCESIQTOFMS

Automated nonlinear alignment of XRF spectra

Published: Nov 29, 2016

Author(s): George Kourousias, Fulvio Billè, Alessandra Gianoncelli

Journal: X-Ray Spectrometry

An important computational operation in a set of spectra is that of aligning them to a reference spectrum. In X‐ray fluorescence, this is referred to as energy calibration and may be necessary for fitting low‐count acquisitions. It may be useful for multi‐element detector systems. Typically, this is carried out in a linear manner, and sometimes requires user feedback. Automated methods exist but are often focused on specific type of data....

Read More thumbnail image: Automated nonlinear alignment of XRF spectra

Pressure dependence of the Raman signal intensity in high‐pressure gases

Published: Nov 28, 2016

Author(s): Dmitry V. Petrov, Ivan I. Matrosov

Journal: Journal of Raman Spectroscopy

At present gas analysis based on Raman, spectroscopy is actively developed. In most cases, to achieve the required Raman signal intensity, compression of the gas medium is used. However, in comparison with normal conditions, the character of motion of molecules and their electric properties change in high‐pressure gas media, thereby violating a linear dependence of the Raman signal intensity on the concentration of molecules and the gas...

Read More thumbnail image: Pressure dependence of the Raman signal intensity in highpressure gases

Preclinical pharmacokinetics and ADME characterization of a novel anticancer chalcone, cardamonin

Published: Nov 28, 2016

Author(s): Swati Jaiswal, Mahendra Shukla, Abhisheak Sharma, Nagarjun Rangaraj, Kalpesh Vaghasiya, Mohd Yaseen Malik, Jawahar Lal

Journal: Drug Testing and Analysis

Cardamonin (CRD), a chalconoid obtained from several medicinal plants of Zingiberaceae family, had shown promising potential in cancer prevention and therapy. For further development and better pharmacological elucidation, we performed a series of in vitro and in vivo studies to characterize its preclinical pharmacokinetics. The study samples were analyzed using validated liquid chromatography‐tandem mass spectrometry (LC‐MS/MS) and high performance...

Read More thumbnail image: Preclinical pharmacokinetics and ADME characterization of a novel anticancer chalcone cardamonin

Urinary steroid profile in females – the impact of menstrual cycle and emergency contraceptives

Published: Nov 28, 2016

Author(s): Jenny E. Mullen, John‐Olof Thörngren, Jenny J. Schulze, Magnus Ericsson, Nina Gårevik, Mikael Lehtihet, Lena Ekström

Journal: Drug Testing and Analysis

Today's doping tests involving longitudinal monitoring of steroid profiles are difficult in women. Women have more complex hormonal fluctuations than men and commonly take drugs such as hormonal contraceptives that are shown to affect biomarkers used in these doping tests. In this study, we followed six women's urinary steroid profile during one menstrual cycle, including both glucuronides and sulfate conjugated fractions. Additionally,...

Read More thumbnail image: Urinary steroid profile in females  the impact of menstrual cycle and emergency contraceptives
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