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Optimization of solid‐phase extraction of parabens and benzophenones in water samples using a combination of Plakett‐Burman and Box‐Behnken designs

Published: Nov 21, 2018

Author(s): Carmin A. Chávez‐Moreno, Laura Hinojosa‐Reyes, Edgar J. Ruiz‐Ruiz, Aracely Hernández‐Ramírez, Jorge L. Guzmán‐Mar

Journal: Journal of Separation Science

Abstract An automated method for the analysis of methylparaben, propylparaben, benzophenone‐3, and benzophenone‐4 in water effluents via on‐line solid‐phase extraction coupled with high‐performance liquid chromatography/ultraviolet detection was proposed. The preconcentration parameters were studied using Plackett‐Burman and Box‐Behnken experimental designs using a C18 sorbent material. The results demonstrated that the eluent...

Read More thumbnail image: Optimization of solidphase extraction of parabens and benzophenones in water samples using a combination of PlakettBurman and BoxBehnken designs

Assessment of quality consistency in traditional Chinese medicine using multi‐wavelength fusion profiling by integrated quantitative fingerprint method: Niuhuang Jiedu pill as an example

Published: Nov 21, 2018

Author(s): Jing Zhang, Guoxiang Sun

Journal: Journal of Separation Science

Abstract Under the wave of the revival of traditional Chinese medicine, there is a quite imperative duty to study an integrated and comprehensive method of fingerprint data processing and analysis on the quality consistency of traditional Chinese medicine. So, we proposed six parameters from two aspects (qualitative and quantitative), three levels (biased to strong peaks, biased to weak peaks, no obvious bias), to comprehensively...

Read More thumbnail image: Assessment of quality consistency in traditional Chinese medicine using multiwavelength fusion profiling by integrated quantitative fingerprint method Niuhuang Jiedu pill as an example

Mapping tissue water T 1 in the liver using the MOLLI T 1 method in the presence of fat, iron and B 0 inhomogeneity

Published: Nov 21, 2018

Author(s): Ferenc E. Mozes, Elizabeth M. Tunnicliffe, Ahmad Moolla, Thomas Marjot, Christina K. Levick, Michael Pavlides, Matthew D. Robson

Journal: NMR in Biomedicine

Modified Look‐Locker inversion recovery (MOLLI) T1 mapping sequences can be useful in cardiac and liver tissue characterization, but determining underlying water T1 is confounded by iron, fat and frequency offsets. This article proposes an algorithm that provides an independent water MOLLI T1 (referred to as on‐resonance water T1) that would have been measured if a subject had no fat and normal iron, and imaging had been done on resonance. Fifteen NiCl2‐doped...

Read More thumbnail image: Mapping tissue water T 1 in the liver using the MOLLI T 1 method in the presence of fat iron and B 0 inhomogeneity

Detection of bemitil and its metabolite in urine by means of LC–MS/MS in view of doping control analysis

Published: Nov 20, 2018

Author(s): Dorota Kwiatkowska, Katarzyna Kowalczyk, Krzysztof Grucza, Mirosław Szutowski, Ewa Bulska, Mariola Wicka

Journal: Drug Testing and Analysis

Abstract 2‐(Ethylthio) benzimidazole is an active ingredient of Antihot, a dietary supplement sold in Ukraine. The substance, available also under names of Bemitil, Metaprot, and Bemaktor, was developed in the USSR in 1970s, and after tests on Soviet cosmonauts and soldiers, several studies on its influence on athletes' performances were conducted. The research showed that bemitil is a synthetic adaptogen which is capable to...

Read More thumbnail image: Detection of bemitil and its metabolite in urine by means of LCMSMS in view of doping control analysis

Sulfate metabolites improve retrospectivity after oral testosterone administration

Published: Nov 20, 2018

Author(s): Argitxu Esquivel, Élida Alechaga, Nuria Monfort, Rosa Ventura

Journal: Drug Testing and Analysis

Abstract The detection of testosterone (T) misuse is performed using the steroid profile that includes concentrations of T and related metabolites excreted free and glucuronoconjugated, and the ratios between them. In this work, the usefulness of 14 endogenous steroid sulfates to improve the detection capabilities of oral T administration has been evaluated. Quantitation of the sulfate metabolites was performed using solid‐phase...

Read More thumbnail image: Sulfate metabolites improve retrospectivity after oral testosterone administration

Metabolomics‐based parallel discovery of xenobiotics and induced endogenous metabolic dysregulation in clinical toxicology

Published: Nov 20, 2018

Author(s): Chang Chen, Ziquan Fan, Hui Xu, Xiaojie Tan, Mingshe Zhu

Journal: Biomedical Chromatography

Abstract Intoxication by xenobiotics triggers the perturbation of metabolic fingerprints in biofluids, including the accumulation of xenobiotic compounds and the dysregulation of endogenous metabolites. In this work, an untargeted metabolomics workflow was developed to simultaneously profile both xenobiotic and endogenous metabolites for the identification of the xenobiotic origin and an in‐depth understanding of the intoxication...

Read More thumbnail image: Metabolomicsbased parallel discovery of xenobiotics and induced endogenous metabolic dysregulation in clinical toxicology

Comparative metabolism of the eight main bioactive ingredients of gegen qinlian decoction by the intestinal flora of diarrhoeal and healthy piglets

Published: Nov 20, 2018

Author(s): Chang‐Shun Liu, Xiao Liang, Xiao‐Han Wei, Fei‐Long Chen, Qing‐Fa Tang, Xiao‐Mei Tan

Journal: Biomedical Chromatography

Abstract Diarrhoeal diseases alter the composition of intestinal flora, thereby affecting the efficacy of herbal medicinal formulations. Gegen Qinlian decoction (GQD), a Chinese traditional herbal formulation, is widely used to treat infectious diarrhoea. However, little is known about the microbial disposition of GQD in the diarrhoeal state. In this study, the comparative metabolism of components of GQD by diarrhoeal and normal...

Read More thumbnail image: Comparative metabolism of the eight main bioactive ingredients of gegen qinlian decoction by the intestinal flora of diarrhoeal and healthy piglets

Isolation and determination of saponin hydrolysis products from Medicago sativa using supercritical fluid extraction, solid‐phase extraction and liquid chromatography with evaporative light scattering detection

Published: Nov 20, 2018

Author(s): Anna Kiełbasa, Aneta Krakowska, Katarzyna Rafińska, Bogusław Buszewski

Journal: Journal of Separation Science

Abstract Saponins are widespread secondary metabolites with various beneficial properties: fungicidal, antibacterial, antiviral, and anticancer. Alfalfa saponin molecules contain mainly: medicagenic acid, hederagenin, bayogenin, and soyasapogenol B. Structural diversity of saponins makes their determination in Medicago sativa extracts very difficult. The most popular determination technique is high‐performance liquid chromatography applied...

Read More thumbnail image: Isolation and determination of saponin hydrolysis products from Medicago sativa using supercritical fluid extraction solidphase extraction and liquid chromatography with evaporative light scattering detection

A protocol for quantifying cardiogenic oscillations in dynamic 129 Xe gas exchange spectroscopy: The effects of idiopathic pulmonary fibrosis

Published: Nov 20, 2018

Author(s): Elianna A. Bier, Scott H. Robertson, Geoffry M. Schrank, Craig Rackley, Joseph G. Mammarappallil, Sudarshan Rajagopal, H. Page McAdams, Bastiaan Driehuys

Journal: NMR in Biomedicine

The spectral parameters of hyperpolarized 129Xe exchanging between airspaces, interstitial barrier, and red blood cells (RBCs) are sensitive to pulmonary pathophysiology. This study sought to evaluate whether the dynamics of 129Xe spectroscopy provide additional insight, with particular focus on quantifying cardiogenic oscillations in the RBC resonance. 129Xe spectra were dynamically acquired in eight healthy volunteers and nine subjects with...

Read More thumbnail image: A protocol for quantifying cardiogenic oscillations in dynamic 129 Xe gas exchange spectroscopy The effects of idiopathic pulmonary fibrosis

Fitting algorithms and baseline correction influence the results of non‐invasive in vivo quantitation of 2‐hydroxyglutarate with 1 H‐MRS

Published: Nov 20, 2018

Author(s): Katharina J. Wenger, Elke Hattingen, Patrick N. Harter, Christian Richter, Kea Franz, Joachim P. Steinbach, Oliver Bähr, Ulrich Pilatus

Journal: NMR in Biomedicine

1H‐MRS enables non‐invasive detection of 2‐hydroxyglutarate (2‐HG), an oncometabolite accumulating in gliomas carrying mutations in the isocitrate dehydrogenase (IDH) genes. Reliable 2‐HG quantitation requires reproducible post‐processing, deployment of fitting algorithms and quantitation methods. We prospectively enrolled 38 patients with suspected or recently diagnosed gliomas (IDH mutated n = 26). The...

Read More thumbnail image: Fitting algorithms and baseline correction influence the results of noninvasive in vivo quantitation of 2hydroxyglutarate with 1 HMRS

Application of in vivo MR methods in the study of breast cancer metabolism

Published: Nov 20, 2018

Author(s): Naranamangalam R. Jagannathan

Journal: NMR in Biomedicine

In the last two decades, various in vivo MR methodologies have been evaluated for their potential in the study of cancer metabolism. During malignant transformation, metabolic alterations occur, leading to morphological and functional changes. Among various MR methods, in vivo MRS has been extensively used in breast cancer to study the metabolism of cells, tissues or whole organs. It provides biochemical information at the metabolite...

Read More thumbnail image: Application of in vivo MR methods in the study of breast cancer metabolism

Evaluation of normal cadaveric Achilles tendon and enthesis with ultrashort echo time (UTE) magnetic resonance imaging and indentation testing

Published: Nov 20, 2018

Author(s): Bimin Chen, Xin Cheng, Erik W. Dorthe, Yinghua Zhao, Darryl D'Lima, Graeme M. Bydder, Sirun Liu, Jiang Du, Ya‐Jun Ma

Journal: NMR in Biomedicine

Entheses are regions where tendons and ligaments attach to bone, and are the primary target in seronegative and other diseases of the musculoskeletal (MSK) system. MRI has been widely used for visualizing features of inflammatory and degenerative MSK disease; however, normal tendons and entheses have short transverse relaxation times (T2), and show little or no signal with conventional clinical MRI pulse sequences, making it difficult to investigate...

Read More thumbnail image: Evaluation of normal cadaveric Achilles tendon and enthesis with ultrashort echo time UTE magnetic resonance imaging and indentation testing

Levels of choline‐containing compounds in normal liver and liver metastases of colorectal cancer as recorded by 1 H MRS

Published: Nov 20, 2018

Author(s): Edwin E.G.W. Voert, Linda Heijmen, Jack J.A. Asten, Alan J. Wright, Iris D. Nagtegaal, Cornelis J.A. Punt, Johannes H.W. Wilt, Hanneke W.M. Laarhoven, Arend Heerschap

Journal: NMR in Biomedicine

Purpose A relatively high signal for choline‐containing compounds (total choline, tCho) is commonly found in 1H MR spectra of malignant tumors, but it is unclear if this also occurs in tumors in the liver. We evaluated the potential of the tCho signal in single voxel 1H MR spectra of the human liver to assess metastases of colorectal cancers. Experiment MR spectra of an...

Read More thumbnail image: Levels of cholinecontaining compounds in normal liver and liver metastases of colorectal cancer as recorded by 1 H MRS

Preface for the special issue of ALC'17

Published: Nov 20, 2018

Author(s): Yahachi Saito

Journal: Surface and Interface Analysis

Read More thumbnail image: Preface for the special issue of ALC17

Applying facilely synthesized CuO/CeO 2 photocatalyst to accelerate methylene blue degradation in hypersaline wastewater

Published: Nov 20, 2018

Author(s): Zhendong Li, Dongfang Liu, Wenli Huang, Yanmei Sun, Songrong Li, Xiaocheng Wei

Journal: Surface and Interface Analysis

Textile and dye effluents have strong color, unstable pH and COD, a lot of inorganic salt, and high biotoxicity. It is difficult and inefficient to remove dyes from high‐saline wastewater by traditional methods. In this study, a simple synthetic CuO/CeO2 photocatalyst is used to achieve high efficiency photodegradation of methylene blue in high salt wastewater. The p‐type CuO/n‐type CeO2 heterojunction photocatalyst is synthesized by a modified...

Read More thumbnail image: Applying facilely synthesized CuOCeO 2 photocatalyst to accelerate methylene blue degradation in hypersaline wastewater

Tribological properties of Ti‐doped diamond‐like carbon coatings under dry friction and PAO oil lubrication

Published: Nov 20, 2018

Author(s): Youzhi Guo, Peng Guo, Lili Sun, Xiaowei Li, Peiling Ke, Qiang Li, Aiying Wang

Journal: Surface and Interface Analysis

Titanium‐doped diamond‐like carbon (Ti‐DLC) coatings with Ti concentration of 4 at.% (Ti4at.%‐DLC) and 27 at.% (Ti27at.%‐DLC) were prepared by a hybrid ion beam deposition system for comparison. The tribological behaviors of Ti‐DLC coatings under dry friction and boundary lubrication conditions were systematically investigated. Results showed that, under dry friction, the Ti4at.%‐DLC coating displayed lower friction coefficient (0.07) and...

Read More thumbnail image: Tribological properties of Tidoped diamondlike carbon coatings under dry friction and PAO oil lubrication

The effect of surface pretreatment on the corrosion behaviour of silanated AA2198‐T851 Al‐Cu‐Li alloy

Published: Nov 20, 2018

Author(s): Uyime Donatus, Rafael Emil Klumpp, Naga Vishnu Vardan Mogili, Renato Aletobelli Antunees, Mariana Xavier Milagre, Isolda Costa

Journal: Surface and Interface Analysis

The corrosion behaviour of silanated AA2198‐T851 alloy substrates with and with no manufacturing‐process induced near‐surface deformed layer (MPI‐NSDL) has been investigated. Two methods (alkaline etching + desmutting and mechanical polishing) were employed in removing the MPI‐NSDL. Silanization was performed using 2‐bis‐triethoxysilylethane. Electrochemical impedance spectroscopy (EIS), salt spray test, and microscopy techniques were...

Read More thumbnail image: The effect of surface pretreatment on the corrosion behaviour of silanated AA2198T851 AlCuLi alloy

Rapid and sensitive surface‐enhanced resonance Raman spectroscopy detection for norepinephrine in biofluids

Published: Nov 20, 2018

Author(s): Xia Zhou, Miao Qin, Jun Zhu, Cong Wang, Guang Zhu, Hongyan Wang, Liangbao Yang

Journal: Journal of Raman Spectroscopy

Abstract Norepinephrine (NE) is a kind of catecholamine neurotransmitter that participates significant function in living organism. Rapid and sensitive detection target in complex system is crucial in analytical science. A facile ferric citrate (CA‐Fe (III)) sensor was designed successfully for sensitive detection of NE by surface‐enhanced resonance Raman spectroscopy (SERRS) method. This CA‐Fe (III) sensor was prepared by modifying...

Read More thumbnail image: Rapid and sensitive surfaceenhanced resonance Raman spectroscopy detection for norepinephrine in biofluids

Si quantum dots enhancement stimulated Raman scattering of water molecules

Published: Nov 20, 2018

Author(s): Fabing Li, Ying Wang, Zhanlong Li, Wenhui Fang, Yeqiu Li, Chenglin Sun, Zhiwei Men

Journal: Journal of Raman Spectroscopy

Abstract Stimulated Raman scattering (SRS) spectra of the OH stretching vibrations of pure water and 2‐nm Si quantum dots (Si QDs) water solution have been investigated under different pump laser energies. Simultaneously, we have studied the spontaneous Raman spectra of pure water and Si QDs water solution at room temperature and atmospheric pressure. The results show that SRS intensity of Si QDs water solution is an order of...

Read More thumbnail image: Si quantum dots enhancement stimulated Raman scattering of water molecules

Preprocessing of spectral data in the extended multiplicative signal correction framework using multiple reference spectra

Published: Nov 20, 2018

Author(s): Joakim Skogholt, Kristian Hovde Liland, Ulf Geir Indahl

Journal: Journal of Raman Spectroscopy

Abstract Extended multiplicative signal correction (EMSC) is a widely used framework for preprocessing spectral data. In the EMSC framework, spectra are scaled according to a given reference spectrum. Spectra that are far from collinear with the selected reference spectrum may not be scaled appropriately. An extension of the EMSC framework that allows for the incorporation of multiple reference spectra in the EMSC model is proposed...

Read More thumbnail image: Preprocessing of spectral data in the extended multiplicative signal correction framework using multiple reference spectra
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