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Affinity extraction of emerging contaminants from water based on bovine serum albumin as a binding agent

Published: Jan 2, 2018

Author(s): Efthimia Papastavros, Rachael A. Remmers, Daniel D. Snow, David A. Cassada, David S. Hage

Journal: Journal of Separation Science

Abstract Affinity sorbents using bovine serum albumin as a binding agent were developed and tested for the extraction of environmental contaminants from water. Computer simulations based on a countercurrent distribution model were also used to study the behavior of these sorbents. Several model drugs, pesticides, and hormones of interest as emerging contaminants were considered in this work, with carbamazepine being used as a...

Read More thumbnail image: Affinity extraction of emerging contaminants from water based on bovine serum albumin as a binding agent

Development of a precolumn derivatization HPLC method with diode‐array detection for the determination of amino sugars in peat and soil humic acids

Published: Jan 2, 2018

Author(s): Erik Beňo, Róbert Góra, Milan Hutta

Journal: Journal of Separation Science

Abstract The work is focused on the development of a high‐performance liquid chromatography method with diode‐array detection for the separation and quantitation of the three most abundant amino sugars; d‐glucosamine, d‐galactosamine, and d‐mannosamine. The high‐performance liquid chromatography separation was carried out by reversed‐phase chromatography on Chromolith Performance RP‐18e monolithic column after acid hydrolysis (5 M HCl) and...

Read More thumbnail image: Development of a precolumn derivatization HPLC method with diodearray detection for the determination of amino sugars in peat and soil humic acids

Preparation of silica microspheres with a broad pore size distribution and their use as the support for a coated cellulose derivative chiral stationary phase

Published: Jan 2, 2018

Author(s): Mingxian Huang, Hongyan Ma, Mengna Niu, Fei Hu, Shige Wang, Lulu Li, Chunguang Lv

Journal: Journal of Separation Science

Abstract A templating strategy using crosslinked and functionalized polymeric beads to synthesize silica microspheres with a broad pore size distribution has been developed. The polymer/silica hybrid microspheres were prepared by utilizing the combination of a templating weak cation exchange resin, a structure‐directing agent N‐trimethoxysilylpropyl‐N,N,N‐trimethylammonium chloride, and a silica precursor tetraethyl orthosilicate. The silica...

Read More thumbnail image: Preparation of silica microspheres with a broad pore size distribution and their use as the support for a coated cellulose derivative chiral stationary phase

Preparation of silica microspheres with a broad pore size distribution and their use as the support for a coated cellulose derivative chiral stationary phase

Published: Jan 2, 2018

Author(s): Mingxian Huang, Hongyan Ma, Mengna Niu, Fei Hu, Shige Wang, Lulu Li, Chunguang Lv

Journal: Journal of Separation Science

Abstract A templating strategy using crosslinked and functionalized polymeric beads to synthesize silica microspheres with a broad pore size distribution has been developed. The polymer/silica hybrid microspheres were prepared by utilizing the combination of a templating weak cation exchange resin, a structure‐directing agent N‐trimethoxysilylpropyl‐N,N,N‐trimethylammonium chloride, and a silica precursor tetraethyl orthosilicate. The silica...

Read More thumbnail image: Preparation of silica microspheres with a broad pore size distribution and their use as the support for a coated cellulose derivative chiral stationary phase

Trace quantification of selected sulfonamides in aqueous media by implementation of a new dispersive solid‐phase extraction method using a nanomagnetic titanium dioxide graphene‐based sorbent and HPLC‐UV

Published: Jan 2, 2018

Author(s): Maryam Izanloo, Ali Esrafili, Mohammad Behbahani, Mahnaz Ghambarian, Hamid Reza Sobhi

Journal: Journal of Separation Science

Abstract Herein, a new dispersive solid‐phase extraction method using a nano magnetic titanium dioxide graphene‐based sorbent in conjunction with high‐performance liquid chromatography and ultraviolet detection was successfully developed. The method was proved to be simple, sensitive, and highly efficient for the trace quantification of sulfacetamide, sulfathiazole, sulfamethoxazole, and sulfadiazine in relatively large volume of...

Read More thumbnail image: Trace quantification of selected sulfonamides in aqueous media by implementation of a new dispersive solidphase extraction method using a nanomagnetic titanium dioxide graphenebased sorbent and HPLCUV

Determination of herbicides in environmental water samples by simultaneous in‐syringe magnetic stirring‐assisted dispersive liquid–liquid microextraction and silylation followed by GC–MS

Published: Jan 2, 2018

Author(s): Ruth Suárez, Sabrina Clavijo, Alba González, Víctor Cerdà

Journal: Journal of Separation Science

Abstract An on‐line, fast, simple, selective, and sensitive method has been developed for the determination of three herbicides belonging to the following families: triazines (atrazine), chloroacetamide (alachlor), and phenoxy (2,4‐dichlorophenoxyacetic acid) in water samples. The method involves an in‐syringe magnetic stirring‐assisted dispersive liquid–liquid microextraction along with simultaneous silylation prior to their...

Read More thumbnail image: Determination of herbicides in environmental water samples by simultaneous insyringe magnetic stirringassisted dispersive liquidliquid microextraction and silylation followed by GCMS

Determination of herbicides in environmental water samples by simultaneous in‐syringe magnetic stirring‐assisted dispersive liquid–liquid microextraction and silylation followed by GC–MS

Published: Jan 2, 2018

Author(s): Ruth Suárez, Sabrina Clavijo, Alba González, Víctor Cerdà

Journal: Journal of Separation Science

Abstract An on‐line, fast, simple, selective, and sensitive method has been developed for the determination of three herbicides belonging to the following families: triazines (atrazine), chloroacetamide (alachlor), and phenoxy (2,4‐dichlorophenoxyacetic acid) in water samples. The method involves an in‐syringe magnetic stirring‐assisted dispersive liquid–liquid microextraction along with simultaneous silylation prior to their...

Read More thumbnail image: Determination of herbicides in environmental water samples by simultaneous insyringe magnetic stirringassisted dispersive liquidliquid microextraction and silylation followed by GCMS

Preparation of highly hydrophilic magnetic nanoparticles with anion‐exchange ability and their application for the extraction of non‐steroidal anti‐inflammatory drugs in environmental samples

Published: Jan 2, 2018

Author(s): Li‐yun Ma, Qian Li, Jing Li, Li Xu

Journal: Journal of Separation Science

Abstract Diallyldimethylammonium chloride modified magnetic nanoparticles were synthesized by the “thiol‐ene” click chemistry reaction. Diallyldimethylammonium chloride rendered the material plenty of quaternary ammonium groups, and thus the excellent aqueous dispersibility and anion‐exchange capability. The novel material was then used as the magnetic solid‐phase extraction sorbent to extract eight non‐steroidal anti‐inflammatory...

Read More thumbnail image: Preparation of highly hydrophilic magnetic nanoparticles with anionexchange ability and their application for the extraction of nonsteroidal antiinflammatory drugs in environmental samples

Deep Omics

Published: Dec 29, 2017

Author(s): Ngoc Hieu Tran, Xianglilan Zhang, Ming Li

Journal: PROTEOMICS

Abstract Deep learning has revolutionized research in image processing, speech recognition, natural language processing, game playing, and will soon revolutionize research in proteomics and genomics. Through three examples in genomics, protein structure prediction, and proteomics, we demonstrate that deep learning is changing bioinformatics research, shifting from algorithm‐centric to data‐centric approaches.

Read More thumbnail image: Deep Omics

Phytochemical profiling of anti‐inflammatory Lavandula extracts via RP–HPLC–DAD–QTOF–MS and –MS/MS: Assessment of their qualitative and quantitative differences

Published: Dec 29, 2017

Author(s): María del Mar Contreras, Francesca Algieri, Alba Rodriguez‐Nogales, Julio Gálvez, Antonio Segura‐Carretero

Journal: ELECTROPHORESIS

Abstract As for other aromatic plants, there are many analytical methods for the determination of volatile compounds in lavender essential oils. Alternatively, in this study RP–HPLC–DAD–QTOF–MS was used for the profiling of the phytochemical constituents of hydromethanolic extracts of L. stoechas and L. dentata, which were obtained by pressurized liquid extraction. The spectrometric data revealed complex profiles constituted of a ...

Read More thumbnail image: Phytochemical profiling of antiinflammatory Lavandula extracts via RPHPLCDADQTOFMS and MSMS Assessment of their qualitative and quantitative differences

Phytochemical profiling of anti‐inflammatory Lavandula extracts via RP–HPLC–DAD–QTOF–MS and –MS/MS: Assessment of their qualitative and quantitative differences

Published: Dec 29, 2017

Author(s): María del Mar Contreras, Francesca Algieri, Alba Rodriguez‐Nogales, Julio Gálvez, Antonio Segura‐Carretero

Journal: ELECTROPHORESIS

Abstract As for other aromatic plants, there are many analytical methods for the determination of volatile compounds in lavender essential oils. Alternatively, in this study RP–HPLC–DAD–QTOF–MS was used for the profiling of the phytochemical constituents of hydromethanolic extracts of L. stoechas and L. dentata, which were obtained by pressurized liquid extraction. The spectrometric data revealed complex profiles constituted of a ...

Read More thumbnail image: Phytochemical profiling of antiinflammatory Lavandula extracts via RPHPLCDADQTOFMS and MSMS Assessment of their qualitative and quantitative differences

Investigation of the BOLD and CBV fMRI responses to somatosensory stimulation in awake marmosets ( Callithrix jacchus )

Published: Dec 29, 2017

Author(s): Yoshiyuki Hirano, Cecil C. Yen, Junjie V. Liu, Julie B. Mackel, Hellmut Merkle, George C. Nascimento, Bojana Stefanovic, Afonso C. Silva

Journal: NMR in Biomedicine

Understanding the spatiotemporal features of the hemodynamic response function (HRF) to brain stimulation is essential for the correct application of neuroimaging methods to study brain function. Here, we investigated the spatiotemporal evolution of the blood oxygen level‐dependent (BOLD) and cerebral blood volume (CBV) HRF in conscious, awake marmosets (Callithrix jacchus), a New World non‐human primate with a lissencephalic brain and with growing...

Read More thumbnail image: Investigation of the BOLD and CBV fMRI responses to somatosensory stimulation in awake marmosets  Callithrix jacchus

Evaluation of markers out of the steroid profile for the screening of testosterone misuse. Part II: Intramuscular administration

Published: Dec 28, 2017

Author(s): Aristotelis Kotronoulas, Àlex Gomez‐Gómez, Andreu Fabregat, Jordi Segura, Sheng Yang, Yanyi Xing, Wu Moutian, Josep Marcos, Jesús Joglar, Rosa Ventura, Oscar J. Pozo

Journal: Drug Testing and Analysis

Abstract In the fight against doping, the introduction of alternative markers to the steroid profile can be considered as an effective approach to improve the screening capabilities for the detection of testosterone (T) misuse. The aim of this study was to evaluate the potential of several T metabolites (cysteinyl conjugated and glucuronoconjugated resistant to enzymatic hydrolysis) to detect both the transdermal and the...

Read More thumbnail image: Evaluation of markers out of the steroid profile for the screening of testosterone misuse_ Part II Intramuscular administration

Evaluation of markers out of the steroid profile for the screening of testosterone misuse. Part II: Intramuscular administration

Published: Dec 28, 2017

Author(s): Aristotelis Kotronoulas, Àlex Gomez‐Gómez, Andreu Fabregat, Jordi Segura, Sheng Yang, Yanyi Xing, Wu Moutian, Josep Marcos, Jesús Joglar, Rosa Ventura, Oscar J. Pozo

Journal: Drug Testing and Analysis

Abstract In the fight against doping, the introduction of alternative markers to the steroid profile can be considered as an effective approach to improve the screening capabilities for the detection of testosterone (T) misuse. The aim of this study was to evaluate the potential of several T metabolites (cysteinyl conjugated and glucuronoconjugated resistant to enzymatic hydrolysis) to detect both the transdermal and the...

Read More thumbnail image: Evaluation of markers out of the steroid profile for the screening of testosterone misuse_ Part II Intramuscular administration

Sensitivity of doping biomarkers after administration of a single dose testosterone gel

Published: Dec 28, 2017

Author(s): Jenny Mullen, Annica Börjesson, Oscar Hopcraft, Jenny J. Schulze, Magnus Ericsson, Anders Rane, Mikael Lehtihet, Lena Ekström

Journal: Drug Testing and Analysis

Abstract Micro‐doping with testosterone (T) is challenging to detect with the current doping tests. Today, the methods available to detect T are longitudinally monitoring of urine biomarkers in the Athlete Biological Passport (ABP) and measuring the isotopic composition of excreted biomarkers to distinguish the origin of the molecule. In this study, we investigated the detectability of a single dose of 100 mg T gel in 8 healthy...

Read More thumbnail image: Sensitivity of doping biomarkers after administration of a single dose testosterone gel

Sensitivity of doping biomarkers after administration of a single dose testosterone gel

Published: Dec 28, 2017

Author(s): Jenny Mullen, Annica Börjesson, Oscar Hopcraft, Jenny J. Schulze, Magnus Ericsson, Anders Rane, Mikael Lehtihet, Lena Ekström

Journal: Drug Testing and Analysis

Abstract Micro‐doping with testosterone (T) is challenging to detect with the current doping tests. Today, the methods available to detect T are longitudinally monitoring of urine biomarkers in the Athlete Biological Passport (ABP) and measuring the isotopic composition of excreted biomarkers to distinguish the origin of the molecule. In this study, we investigated the detectability of a single dose of 100 mg T gel in 8 healthy...

Read More thumbnail image: Sensitivity of doping biomarkers after administration of a single dose testosterone gel

Application of pH‐zone‐refining countercurrent chromatography in the chiral separation of two β‐adrenergic blocking agents

Published: Dec 28, 2017

Author(s): Liqiong Lv, Zhisi Bu, Wenyu Sun, Chaoyue Wang, Cong Xu, Shengqiang Tong

Journal: Journal of Separation Science

Abstract Two β‐adrenergic blocking agents, 1‐[(1‐methylethyl)amino]‐3‐phenoxy‐2‐propanol (1) and 1‐[(1‐methylethyl)amino]‐3‐(3‐methylphenoxy)‐2‐propanol (2; Toliprolol), were enantioseparated by pH‐zone‐refining countercurrent chromatography. A two‐phase solvent system composed of chloroform containing 0.10 mol/L of di‐n‐hexyl l‐tartrate/0.10 mol/L of boric acid aqueous solution (1:1, v/v) was selected, in which 20 mmol/L triethylamine was...

Read More thumbnail image: Application of pHzonerefining countercurrent chromatography in the chiral separation of two adrenergic blocking agents

Application of pH‐zone‐refining countercurrent chromatography in the chiral separation of two β‐adrenergic blocking agents

Published: Dec 28, 2017

Author(s): Liqiong Lv, Zhisi Bu, Wenyu Sun, Chaoyue Wang, Cong Xu, Shengqiang Tong

Journal: Journal of Separation Science

Abstract Two β‐adrenergic blocking agents, 1‐[(1‐methylethyl)amino]‐3‐phenoxy‐2‐propanol (1) and 1‐[(1‐methylethyl)amino]‐3‐(3‐methylphenoxy)‐2‐propanol (2; Toliprolol), were enantioseparated by pH‐zone‐refining countercurrent chromatography. A two‐phase solvent system composed of chloroform containing 0.10 mol/L of di‐n‐hexyl l‐tartrate/0.10 mol/L of boric acid aqueous solution (1:1, v/v) was selected, in which 20 mmol/L triethylamine was...

Read More thumbnail image: Application of pHzonerefining countercurrent chromatography in the chiral separation of two adrenergic blocking agents

Investigation of solvation of ammonium salts: A Raman spectroscopy and ab initio study

Published: Dec 28, 2017

Author(s): Anamika Mukhopadhyay, Pankaj Dubey

Journal: Journal of Raman Spectroscopy

Abstract The effect of dissolved salts on the hydrogen bonded network in water is extremely important to be understood, as it plays an important role in many aspects of structure and dynamics in aqueous solutions. We have undertaken a study of this phenomenon, using NH4Cl (AC) and (NH4)2SO4 (AS), as the salts for influencing the hydrogen bonded network in water. The effects of varying the temperature and concentration in these...

Read More thumbnail image: Investigation of solvation of ammonium salts A Raman spectroscopy and ab initio study

Investigation of solvation of ammonium salts: A Raman spectroscopy and ab initio study

Published: Dec 28, 2017

Author(s): Anamika Mukhopadhyay, Pankaj Dubey

Journal: Journal of Raman Spectroscopy

Abstract The effect of dissolved salts on the hydrogen bonded network in water is extremely important to be understood, as it plays an important role in many aspects of structure and dynamics in aqueous solutions. We have undertaken a study of this phenomenon, using NH4Cl (AC) and (NH4)2SO4 (AS), as the salts for influencing the hydrogen bonded network in water. The effects of varying the temperature and concentration in these...

Read More thumbnail image: Investigation of solvation of ammonium salts A Raman spectroscopy and ab initio study
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