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Simple and accurate method for determining dissolved inorganic carbon in environmental water by reaction headspace gas chromatography

Published: Dec 27, 2017

Author(s): Wei‐Qi Xie, Yi‐Xian Gong, Kong‐Xian Yu

Journal: Journal of Separation Science

Abstract We investigate a simple and accurate method for quantitatively analyzing dissolved inorganic carbon in environmental water by reaction headspace gas chromatography. The neutralization reaction between the inorganic carbon species (i.e. bicarbonate ions and carbonate ions) in environmental water and hydrochloric acid is carried out in a sealed headspace vial, and the carbon dioxide formed from the neutralization reaction,...

Read More thumbnail image: Simple and accurate method for determining dissolved inorganic carbon in environmental water by reaction headspace gas chromatography

Simple and accurate method for determining dissolved inorganic carbon in environmental water by reaction headspace gas chromatography

Published: Dec 27, 2017

Author(s): Wei‐Qi Xie, Yi‐Xian Gong, Kong‐Xian Yu

Journal: Journal of Separation Science

Abstract We investigate a simple and accurate method for quantitatively analyzing dissolved inorganic carbon in environmental water by reaction headspace gas chromatography. The neutralization reaction between the inorganic carbon species (i.e. bicarbonate ions and carbonate ions) in environmental water and hydrochloric acid is carried out in a sealed headspace vial, and the carbon dioxide formed from the neutralization reaction,...

Read More thumbnail image: Simple and accurate method for determining dissolved inorganic carbon in environmental water by reaction headspace gas chromatography

Investigating the robustness and extraction performance of a matrix‐compatible solid‐phase microextraction coating in human urine and its application to assess 2–6‐ring polycyclic aromatic hydrocarbons using GC–MS/MS

Published: Dec 27, 2017

Author(s): Attilio Naccarato, Emanuela Gionfriddo, Rosangela Elliani, Janusz Pawliszyn, Giovanni Sindona, Antonio Tagarelli

Journal: Journal of Separation Science

Abstract In this work, a polydimethylsiloxane/divinylbenzene fiber overcoated with a layer of polydimethylsiloxane was evaluated as analytical sampling tool for the first time in human urine. Urinary polycyclic aromatic hydrocarbons with 2–6 aromatic rings were considered as target compounds. The analyte uptake in kinetic and thermodynamic regime was evaluated and compared to the performances of polydimethylsiloxane/divinylbenzene...

Read More thumbnail image: Investigating the robustness and extraction performance of a matrixcompatible solidphase microextraction coating in human urine and its application to assess 26ring polycyclic aromatic hydrocarbons using GCMSMS

Investigating the robustness and extraction performance of a matrix‐compatible solid‐phase microextraction coating in human urine and its application to assess 2–6‐ring polycyclic aromatic hydrocarbons using GC–MS/MS

Published: Dec 27, 2017

Author(s): Attilio Naccarato, Emanuela Gionfriddo, Rosangela Elliani, Janusz Pawliszyn, Giovanni Sindona, Antonio Tagarelli

Journal: Journal of Separation Science

Abstract In this work, a polydimethylsiloxane/divinylbenzene fiber overcoated with a layer of polydimethylsiloxane was evaluated as analytical sampling tool for the first time in human urine. Urinary polycyclic aromatic hydrocarbons with 2–6 aromatic rings were considered as target compounds. The analyte uptake in kinetic and thermodynamic regime was evaluated and compared to the performances of polydimethylsiloxane/divinylbenzene...

Read More thumbnail image: Investigating the robustness and extraction performance of a matrixcompatible solidphase microextraction coating in human urine and its application to assess 26ring polycyclic aromatic hydrocarbons using GCMSMS

Comparative study on the liquid chromatographic enantioseparation of cyclic β‐amino acids and the related cyclic β‐aminohydroxamic acids on Cinchona alkaloid‐based zwitterionic chiral stationary phases

Published: Dec 27, 2017

Author(s): Attila Bajtai, Beáta Fekete, Márta Palkó, Ferenc Fülöp, Wolfgang Lindner, Michal Kohout, István Ilisz, Antal Péter

Journal: Journal of Separation Science

Abstract The enantiomeric pairs of cis and trans stereoisomers of cyclic β‐aminohydroxamic acids and their related cis and trans cyclic β‐amino acids containing two chiral centers were directly separated on four structurally related chiral stationary phases derived from quinine and quinidine modified with (R,R)‐ and (S,S)‐aminocyclohexanesulfonic acids. Applying these zwitterionic ion‐exchangers as chiral selectors, the effects of the composition ...

Read More thumbnail image: Comparative study on the liquid chromatographic enantioseparation of cyclic amino acids and the related cyclic aminohydroxamic acids on Cinchona alkaloidbased zwitterionic chiral stationary phases

Comparative study on the liquid chromatographic enantioseparation of cyclic β‐amino acids and the related cyclic β‐aminohydroxamic acids on Cinchona alkaloid‐based zwitterionic chiral stationary phases

Published: Dec 27, 2017

Author(s): Attila Bajtai, Beáta Fekete, Márta Palkó, Ferenc Fülöp, Wolfgang Lindner, Michal Kohout, István Ilisz, Antal Péter

Journal: Journal of Separation Science

Abstract The enantiomeric pairs of cis and trans stereoisomers of cyclic β‐aminohydroxamic acids and their related cis and trans cyclic β‐amino acids containing two chiral centers were directly separated on four structurally related chiral stationary phases derived from quinine and quinidine modified with (R,R)‐ and (S,S)‐aminocyclohexanesulfonic acids. Applying these zwitterionic ion‐exchangers as chiral selectors, the effects of the composition ...

Read More thumbnail image: Comparative study on the liquid chromatographic enantioseparation of cyclic amino acids and the related cyclic aminohydroxamic acids on Cinchona alkaloidbased zwitterionic chiral stationary phases

Simultaneous quantitative assessment of nine glycosides in tobacco by liquid chromatography–tandem mass spectrometry

Published: Dec 27, 2017

Author(s): Yue Yuan, Rong Zhou, Dongliang Li, Cheng Luo, Guoyou Li

Journal: Journal of Separation Science

Abstract A simple and efficient method combining ultrasound‐assisted extraction, the conditions of which were optimized by response surface methodology, with liquid chromatography and tandem mass spectrometry was established and validated for the absolute quantification of nine non‐volatile neutral glycosides originating from tobacco (Nicotiana tobaccum L.) leaves, comprising three phenolic glycosides, one benzanoid glycoside, and five...

Read More thumbnail image: Simultaneous quantitative assessment of nine glycosides in tobacco by liquid chromatographytandem mass spectrometry

Simultaneous quantitative assessment of nine glycosides in tobacco by liquid chromatography–tandem mass spectrometry

Published: Dec 27, 2017

Author(s): Yue Yuan, Rong Zhou, Dongliang Li, Cheng Luo, Guoyou Li

Journal: Journal of Separation Science

Abstract A simple and efficient method combining ultrasound‐assisted extraction, the conditions of which were optimized by response surface methodology, with liquid chromatography and tandem mass spectrometry was established and validated for the absolute quantification of nine non‐volatile neutral glycosides originating from tobacco (Nicotiana tobaccum L.) leaves, comprising three phenolic glycosides, one benzanoid glycoside, and five...

Read More thumbnail image: Simultaneous quantitative assessment of nine glycosides in tobacco by liquid chromatographytandem mass spectrometry

Generic approach to the method development of intact protein separations using hydrophobic interaction chromatography

Published: Dec 27, 2017

Author(s): Eva Tyteca, Jelle Vos, Marco Tassi, Ken Cook, Xiaodong Liu, Erwin Kaal, Sebastiaan Eeltink

Journal: Journal of Separation Science

Abstract We describe a liquid chromatography method development approach for the separation of intact proteins using hydrophobic interaction chromatography. First, protein retention was determined as function of the salt concentration by isocratic measurements and modeled using linear regression. The error between measured and predicted retention factors was studied while varying gradient time (between 15 and 120 min) and...

Read More thumbnail image: Generic approach to the method development of intact protein separations using hydrophobic interaction chromatography

Generic approach to the method development of intact protein separations using hydrophobic interaction chromatography

Published: Dec 27, 2017

Author(s): Eva Tyteca, Jelle Vos, Marco Tassi, Ken Cook, Xiaodong Liu, Erwin Kaal, Sebastiaan Eeltink

Journal: Journal of Separation Science

Abstract We describe a liquid chromatography method development approach for the separation of intact proteins using hydrophobic interaction chromatography. First, protein retention was determined as function of the salt concentration by isocratic measurements and modeled using linear regression. The error between measured and predicted retention factors was studied while varying gradient time (between 15 and 120 min) and...

Read More thumbnail image: Generic approach to the method development of intact protein separations using hydrophobic interaction chromatography

Development and optimisation of a novel three‐way extraction technique based on a combination of Soxhlet extraction, membrane assisted solvent extraction and a molecularly imprinted polymer using sludge polycyclic aromatic hydrocarbons as model compounds

Published: Dec 27, 2017

Author(s): Somandla Ncube, Goitsemang Lekoto, Ewa Cukrowska, Luke Chimuka

Journal: Journal of Separation Science

Abstract A novel technique that integrates extraction and clean‐up into a single step format is reported as part of the search for new sample preparation techniques in the analysis of persistent organic pollutants from complex samples. This was achieved by combining the extraction efficiency of the Soxhlet extractor, the selectivity of a size exclusion membrane and the specificity of a molecularly imprinted polymer for the...

Read More thumbnail image: Development and optimisation of a novel threeway extraction technique based on a combination of Soxhlet extraction membrane assisted solvent extraction and a molecularly imprinted polymer using sludge polycyclic aromatic hydrocarbons as model compounds

Development and optimisation of a novel three‐way extraction technique based on a combination of Soxhlet extraction, membrane assisted solvent extraction and a molecularly imprinted polymer using sludge polycyclic aromatic hydrocarbons as model compounds

Published: Dec 27, 2017

Author(s): Somandla Ncube, Goitsemang Lekoto, Ewa Cukrowska, Luke Chimuka

Journal: Journal of Separation Science

Abstract A novel technique that integrates extraction and clean‐up into a single step format is reported as part of the search for new sample preparation techniques in the analysis of persistent organic pollutants from complex samples. This was achieved by combining the extraction efficiency of the Soxhlet extractor, the selectivity of a size exclusion membrane and the specificity of a molecularly imprinted polymer for the...

Read More thumbnail image: Development and optimisation of a novel threeway extraction technique based on a combination of Soxhlet extraction membrane assisted solvent extraction and a molecularly imprinted polymer using sludge polycyclic aromatic hydrocarbons as model compounds

Analysis of emerging organic contaminants in poultry manure by gas chromatography–tandem mass spectrometry

Published: Dec 27, 2017

Author(s): Ramón Aznar, Beatriz Albero, Rosa Ana Pérez, Consuelo Sánchez‐Brunete, Esther Miguel, José L. Tadeo

Journal: Journal of Separation Science

Abstract A multiresidue method was developed for the determination of 19 emerging organic contaminants (pharmaceutical drugs, personal care products, and bisphenol A) in poultry manure. Lyophilized samples of manure were extracted by ultrasound‐assisted matrix solid‐phase dispersion and the extracts were analyzed by gas chromatography with tandem mass spectrometry after derivatization. Analysis of spiked poultry manure samples, at...

Read More thumbnail image: Analysis of emerging organic contaminants in poultry manure by gas chromatographytandem mass spectrometry

Analysis of emerging organic contaminants in poultry manure by gas chromatography–tandem mass spectrometry

Published: Dec 27, 2017

Author(s): Ramón Aznar, Beatriz Albero, Rosa Ana Pérez, Consuelo Sánchez‐Brunete, Esther Miguel, José L. Tadeo

Journal: Journal of Separation Science

Abstract A multiresidue method was developed for the determination of 19 emerging organic contaminants (pharmaceutical drugs, personal care products, and bisphenol A) in poultry manure. Lyophilized samples of manure were extracted by ultrasound‐assisted matrix solid‐phase dispersion and the extracts were analyzed by gas chromatography with tandem mass spectrometry after derivatization. Analysis of spiked poultry manure samples, at...

Read More thumbnail image: Analysis of emerging organic contaminants in poultry manure by gas chromatographytandem mass spectrometry

l‐ Cysteine‐modified silver‐functionalized silica‐based material as an efficient solid‐phase extraction adsorbent for the determination of bisphenol A

Published: Dec 27, 2017

Author(s): Yuanyuan Li, Nan Zhu, Bingxiang Li, Tong Chen, Yulong Ma, Qiang Li

Journal: Journal of Separation Science

Abstract A new silver‐functionalized silica‐based material with a core–shell structure based on silver nanoparticle‐coated silica spheres was synthesized, and silver nanoparticles were modified using strongly bound l‐cysteine. l‐Cysteine‐silver@silica was characterized by scanning electron microscopy and FTIR spectroscopy. Then, a solid‐phase extraction method based on l‐cysteine‐silver@silica was developed and successfully used for bisphenol A...

Read More thumbnail image: l Cysteinemodified silverfunctionalized silicabased material as an efficient solidphase extraction adsorbent for the determination of bisphenol A

l‐ Cysteine‐modified silver‐functionalized silica‐based material as an efficient solid‐phase extraction adsorbent for the determination of bisphenol A

Published: Dec 27, 2017

Author(s): Yuanyuan Li, Nan Zhu, Bingxiang Li, Tong Chen, Yulong Ma, Qiang Li

Journal: Journal of Separation Science

Abstract A new silver‐functionalized silica‐based material with a core–shell structure based on silver nanoparticle‐coated silica spheres was synthesized, and silver nanoparticles were modified using strongly bound l‐cysteine. l‐Cysteine‐silver@silica was characterized by scanning electron microscopy and FTIR spectroscopy. Then, a solid‐phase extraction method based on l‐cysteine‐silver@silica was developed and successfully used for bisphenol A...

Read More thumbnail image: l Cysteinemodified silverfunctionalized silicabased material as an efficient solidphase extraction adsorbent for the determination of bisphenol A

Canagliflozin stability study and ecofriendly chromatographic determination of its degradation product: A comparative study

Published: Dec 27, 2017

Author(s): Aml A. Emam

Journal: Journal of Separation Science

Abstract Canagliflozin is a newly approved drug for type II diabetes mellitus. A full stability study of canagliflozin was performed following international conference on harmonization strategies. The drug was stable against all conditions except oxidation where only one degradation product was separated and structurally elucidated using mass spectrometry and infrared spectroscopy. A green high‐performance thin‐layer chromatographic...

Read More thumbnail image: Canagliflozin stability study and ecofriendly chromatographic determination of its degradation product A comparative study

Canagliflozin stability study and ecofriendly chromatographic determination of its degradation product: A comparative study

Published: Dec 27, 2017

Author(s): Aml A. Emam

Journal: Journal of Separation Science

Abstract Canagliflozin is a newly approved drug for type II diabetes mellitus. A full stability study of canagliflozin was performed following international conference on harmonization strategies. The drug was stable against all conditions except oxidation where only one degradation product was separated and structurally elucidated using mass spectrometry and infrared spectroscopy. A green high‐performance thin‐layer chromatographic...

Read More thumbnail image: Canagliflozin stability study and ecofriendly chromatographic determination of its degradation product A comparative study

Screening and identification of α‐glucosidase inhibitors from Shenqi Jiangtang Granule by ultrafiltration liquid chromatography and mass spectrometry

Published: Dec 27, 2017

Author(s): Hui Zhang, Xiaojing Zhang, Huijie Jiang, Cong Xu, Shengqiang Tong, Jizhong Yan

Journal: Journal of Separation Science

Abstract Shenqi Jiangtang Granule, a well‐known traditional Chinese herbal preparation, has been widely used for the treatment of type II diabetes mellitus. In this work, an ultrafiltration liquid chromatography with quadrupole time‐of‐flight mass spectrometry method was proposed for the rapid identification of bioactive ingredients from Shenqi Jiangtang Granule using α‐glucosidase as an example. First, the chemical profile of this...

Read More thumbnail image: Screening and identification of glucosidase inhibitors from Shenqi Jiangtang Granule by ultrafiltration liquid chromatography and mass spectrometry

Quantitative determination of acidic hydrolysis products of Chemical Weapons Convention related chemicals from aqueous and soil samples using ion‐pair solid‐phase extraction and in situ butylation

Published: Dec 27, 2017

Author(s): Suresh Pal Anagoni, Asma Kauser, Gopal Maity, Vijayasarathi V. R. Upadhyayula

Journal: Journal of Separation Science

Abstract Chemical warfare agents such as organophosphorus nerve agents, mustard agents, and psychotomimetic agent like 3‐quinuclidinylbenzilate degrade in the environment and form acidic degradation products, the analysis of which is difficult under normal analytical conditions. In the present work, a simultaneous extraction and derivatization method in which the analytes are butylated followed by gas chromatography and mass...

Read More thumbnail image: Quantitative determination of acidic hydrolysis products of Chemical Weapons Convention related chemicals from aqueous and soil samples using ionpair solidphase extraction and in situ butylation
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