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Journal of Separation Science

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https://www.readbyqxmd.com/read/29350466/simultaneous-extraction-and-determination-of-trace-amounts-of-diclofenac-from-whole-blood-using-supported-liquid-membrane-microextraction-and-fast-fourier-transform-voltammetry
#1
Zahra Mofidi, Parviz Norouzi, Masumeh Sajadian, Mohammad Reza Ganjali
A novel, simple and inexpensive analytical technique based on flat sheet supported liquid membrane microextraction coupled with fast Fourier transform stripping cyclic voltammetry on a reduced graphene oxide carbon paste electrode was used for the extraction and online determination of diclofenac in whole blood. First, diclofenac was extracted from blood samples using a polytetrafluoroethylene membrane impregnated with 1-octanol and then into an acceptor solution, subsequently it was oxidized on a carbon paste electrode modified with reduced graphene oxide nano-sheets...
January 19, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29337424/enantiomeric-separation-of-six-chiral-pesticides-that-contain-chiral-sulfur-phosphorus-atoms-by-supercritical-fluid-chromatography
#2
Lijun Zhan, Yelong Miao, Chunmian Lin
Six chiral pesticides containing chiral sulfur/phosphorus atoms were separated by supercritical fluid chromatography with supercritical CO2 as the main mobile phase component. The effect of the chiral stationary phase, different type and concentration of modifiers, column temperature, and backpressure on the separation efficiency was investigated to obtain the appropriate separation condition. Five chiral pesticides (isofenphos-methyl, isocarbophos, flufiprole, fipronil, and ethiprole) were baseline separated under experimental conditions, while isofenphos only obtained partial separation...
January 16, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29334589/preparation-and-evaluation-of-a-deoxycholic-calix-4-arene-hybrid-type-receptor-as-a-chiral-stationary-phase-for-hplc
#3
Sadegh Yaghoubnejad, Kourosh Tabar Heydar, Seyyed Hamid Ahmadi, Reza Zadmard, Nima Ghonouei
We report the synthesis and enantioseparation characteristics of two novel covalently immobilized deoxycholic acid derivatives as chiral stationary phases for high-performance liquid chromatography. In the structure of the first stationary phase, the 3-position of deoxycholic acid is substituted with a 3,5-dinitrophenylcarbamoyl group and the second one has an additional calix[4]arene attached to the carboxylic group of the deoxycholic acid. The chromatographic performance of the stationary phases was evaluated with enantioseparation of N-(3,5-dinitrobenzoyl)-dl-leucine, N-(3,5-dinitrobenzoyl)-dl-valine, omeprazole, diclofop-methyl, dl-mandelic acid and (RS)-pregabalin...
January 15, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29333682/selective-extraction-of-bisphenol-a-from-water-by-one-monomer-molecularly-imprinted-magnetic-nanoparticles
#4
Zhenkun Lin, Yanfang Zhang, Yu Su, Jinxia Qi, Yinhang Jia, Changjiang Huang, Qiaoxiang Dong
One-monomer molecularly imprinted magnetic nanoparticles were prepared as adsorbents for selective extraction of bisphenol A from water in this study. A single bi-functional monomer was adopted for preparation of the molecularly imprinted polymer, avoiding the tedious trial-and-error optimizations as traditional strategy. Moreover, bisphenol F was used as the dummy template for bisphenol A to avoid the interference from residual template molecules. These nanoparticles not only showed large adsorption capacity and good selectivity to the bisphenol A, but also outstanding magnetic response performance...
January 15, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29333671/selective-enrichment-of-n-linked-glycopeptides-and-glycans-by-using-a-dextran-modified-hydrophilic-material
#5
Linlin Chen, Di Ding, Qianying Sheng, Long Yu, Xiuping Liu, Xinmiao Liang
Glycosylation analysis of proteins from biological sources utilizing mass-spectrometry-based approaches is challenging due to the relatively low abundance of glycopeptides, the structural diversity of glycans as well as the co-existing matrices. In this study, a customized dextran-bonded silica-based stationary phase was introduced for selective enrichment of glycopeptides and glycans from complex biological samples. This material has exhibited superior selectivity and broader glycosylation site coverage over commercial Sepharose in glycoproteomic evaluation...
January 15, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29333638/rapid-profiling-of-polymeric-phenolic-acids-in-salvia-miltiorrhiza-by-hybrid-data-dependent-targeted-multistage-mass-spectrometry-acquisition-based-on-expected-compounds-prediction-and-fragment-ion-searching
#6
Yao Shen, Zijin Feng, Min Yang, Zhe Zhou, Sumei Han, Jinjun Hou, Zhenwei Li, Wanying Wu, De-An Guo
Phenolic acids are the major water-soluble components in Salvia miltiorrhiza (> 5%). According to previous studies, many of them contribute to the cardiovascular effects and antioxidant effects of S. miltiorrhiza. Polymeric phenolic acids can be considered as the tanshinol derived metabolites, e.g., dimmers, trimers and tetramers. A strategy combined with tanshinol-based expected compounds prediction, total ion chromatogram filtering, Fragment Ion Searching and parent list-based multistage mass spectrometry acquisition by Linear Trap Quadropole-orbitrap Velos Mass Spectrometry was proposed to rapid profile polymeric phenolic acids in S...
January 15, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29331063/simultaneous-pharmacokinetics-and-stability-studies-of-physalins-in-rat-plasma-and-intestinal-bacteria-culture-media-using-liquid-chromatography-with-mass-spectrometry
#7
Yunliang Zheng, Meihua Lin, Xingjiang Hu, You Zhai, Qiao Zhang, Yan Lou, Jianzhong ShenTu, Lihua Wu
Physalins are the major steroidal constituent of Physalis plants and display a range of biological activity. For this study, a rapid and sensitive high-performance liquid chromatography with triple quadrupole mass spectrometry method was developed for the simultaneous quantification of six physalins. Specifically, it was for the quantification of physalin A, physalin B, physalin D, physalin G, 4,7-didehydroneophysalin B and isophysalin B in rat plasma and rat intestinal bacteria. After a solid-phase extraction, analytes and internal standards (prednisolone) were separated on a Shield reverse-phase C18 column (measuring 3 mm × 150 mm with an internal diameter of 3...
January 13, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29330963/metal-organic-framework-based-in-syringe-solid-phase-extraction-for-the-on-site-sampling-of-polycyclic-aromatic-hydrocarbons-from-environmental-water-samples
#8
Xiaoqiong Zhang, Peiyi Wang, Qiang Han, Hengzhen Li, Tong Wang, Mingyu Ding
In-syringe solid-phase extraction is a promising sample pretreatment method for the on-site sampling of water samples because of its outstanding advantages of portability, simple operation, short extraction time and low cost. In this work, a novel in-syringe solid-phase extraction device using metal-organic frameworks as the adsorbent was fabricated for the on-site sampling of polycyclic aromatic hydrocarbons from environmental waters. Trace polycyclic aromatic hydrocarbons were effectively extracted through the self-made device followed by gas chromatography with mass spectrometry analysis...
January 13, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29330916/separation-of-three-polar-compounds-from-rheum-tanguticum-by-high-speed-counter-current-chromatography-with-an-ethyl-acetate-glacial-acetic-acid-water-system
#9
Tao Chen, Ping Wang, Nana Wang, Chongyang Sun, Xue Yang, Hongmei Li, Guoying Zhou, Yulin Li
The separation of polar compounds by high-speed counter-current chromatography is still regarded as a challenge. In this study, an efficient strategy for the separation of three polar compounds from Rheum tanguticum has been successfully conducted by using high-speed counter-current chromatography. X-5 macroporous resin chromatography was used for the fast enrichment of the target compounds. Then, the target fraction was directly introduced into high-speed counter-current chromatography for separation using ethyl acetate/glacial acetic acid/water (100:1:100, v/v) as the solvent system...
January 13, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29330912/high-capacity-protein-a-affinity-chromatography-for-the-fast-quantification-of-antibodies-two-wavelength-detection-expands-linear-range
#10
Peter Satzer, Alois Jungbauer
The high-throughput analysis of antibodies from processes can be enhanced when the linear range is expanded and sample preparation is kept to a minimum. We developed a fast chromatography method based on a hexameric variant of Staphylococcal protein A immobilized on Toyopearl matrix, TSK 5 PW using two wavelengths. A protocol with 5 min runtime and a single-wavelength detection at 280 nm yielded an upper limit of quantification of 2.10 mg/mL and a lower limit of quantification of 0.06 mg/mL. The optimized method with a runtime of 2 min and two-wavelength detection at 280 and 300 nm allowed us to span a valid concentration range of 0...
January 13, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29330898/determination-of-phthalate-esters-in-soil-using-a-quick-easy-cheap-effective-rugged-and-safe-method-followed-by-gc-ms
#11
Qianjun Liu, Di Chen, Jiyuan Wu, Guangcai Yin, Qintie Lin, Min Zhang, Huawen Hu
A quick, easy, cheap, effective, rugged, and safe procedure was designed to extract pesticide residues from fruits and vegetables with a high percentage of water. It has not been used extensively for the extraction of phthalate esters from sediments, soils and sludges. In this work, this procedure was combined with gas chromatography with mass spectrometry to determine 16 selected phthalate esters in soil. The extraction efficiency of the samples was improved by ultrasonic extraction and dissolution of the soil samples in ultra-pure water, which promoted the dispersion of the samples...
January 13, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29330897/cyclodextrin-assisted-dispersive-liquid-liquid-microextraction-for-the-preconcentration-of-carbamazepine-and-clobazam-with-subsequent-sweeping-micellar-electrokinetic-chromatography
#12
Szu-Ying Chen, Wen-Chi Chen, Sarah Y Chang
A new version of dispersive liquid-liquid microextraction, namely, cyclodextrin-assisted dispersive liquid-liquid microextraction, with subsequent sweeping micellar electrokinetic chromatography has been developed for the preconcentration and sensitive detection of carbamazepine and clobazam. α-Cyclodextrin and chloroform were used as the dispersive agent and extraction solvent, respectively. After the extraction, carbamazepine and clobazam were analyzed using micellar electrokinetic chromatography with ultraviolet detection...
January 13, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29328549/synthesis-of-polydopamine-functionalized-magnetic-graphene-and-carbon-nanotubes-hybrid-nanocomposites-as-an-adsorbent-for-the-fast-determination-of-16-priority-polycyclic-aromatic-hydrocarbons-in-aqueous-samples
#13
Kun Chen, Rongrong Jin, Chen Luo, Guoxin Song, Yaoming Hu, Hefa Cheng
A novel adsorbent made of polydopamine-functionalized magnetic graphene and carbon nanotubes hybrid nanocomposite was synthesized and applied in the determination of 16 priority polycyclic aromatic hydrocarbons by magnetic solid phase extraction in water samples. FTIR spectroscopy, transmission electron microscopy, scanning electron microscopy, and Raman spectroscopy consistently indicate that the synthesized adsorbents are made of core-shell nanoparticles well dispersed on the surface of graphene and carbon nanotubes...
January 12, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29327507/rapid-characterization-of-chlorogenic-acids-in-duhaldea-nervosa-based-on-uhplc-ltq-orbitrap-ms-and-mass-spectral-trees-similarity-filter-technique
#14
Lianghong Liu, Jiayu Zhang, Binjie Zheng, Ying Guan, Liting Wang, Lei Chen, Wei Cai
Duhaldea nervosa (Wallich ex Candolle) A. Anderberg (D. nervosa) has been traditionally used as a food spice and also in folk medicine for treating traumatic injury and relieving rheumatism, especially, accelerating the healing of a fracture. However, so far as we are aware, the chemical constituents have not been fully investigated. In this study, a practical method of mass spectral trees similarity filter, a data-mining technique, was developed and evaluated for the rapid detection and identification complicated constituents based on UHPLC-LTQ-Orbitrap-MS...
January 12, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29327466/analysis-of-trace-levels-of-impurities-and-hydrogen-isotopes-in-helium-purge-gas-using-gas-chromatography-for-tritium-extraction-system-of-an-indian-lead-lithium-ceramic-breeder-test-blanket-module
#15
V Gayathri Devi, Amit Sircar, Deepak Yadav, Jayraj Parmar
In the fusion fuel cycle, the accurate analysis and understanding of the chemical composition of any gas mixture is of great importance for the efficient design of a tritium extraction and purification system or any tritium handling system. Methods like laser Raman spectroscopy and gas chromatography with thermal conductivity detector have been considered for hydrogen isotopes analyses in fuel cycles. Gas chromatography with a cryogenic separation column has been used for the analysis of hydrogen isotopes gas mixtures in general due to its high reliability and ease of operation...
January 12, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29327426/quantification-of-total-cholesterol-in-human-milk-by-gas-chromatography
#16
Maurizio Beggio, Cristina Cruz-Hernandez, Pierre-Alain Golay, Le Ye Lee, Francesca Giuffrida
Human milk provides the key nutrients necessary for infant growth and development. The objective of this study was to develop and validate a method to analyze the cholesterol content in liquid human milk samples along lactation. Direct saponification of the sample using ethanolic potassium hydroxide solution under cold conditions was applied and unsaponifiable matter was separated by centrifugation. Cholesterol was converted into its trimethylsilyl ether and the derivative analyzed by gas chromatography coupled with a flame ionization detector...
January 12, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29327421/ionic-liquid-chemically-bonded-basalt-fibers-for-in-tube-solid-phase-microextraction
#17
Juanjuan Feng, Huijun Mao, Xiuqin Wang, Yu Tian, Chuannan Luo, Min Sun
Ionic liquids have been widely used in different fields by advantage of its specific property. In this work, 1-methyl-3-(3-trimethoxysilyl propyl)imidazolium chloride was prepared and chemically bonded onto basalt fibers for in-tube solid-phase microextraction. Through combining in-tube extraction device with high performance liquid chromatography equipped with a diode array detector, an online enrichment and analysis method for eight polycyclic aromatic hydrocarbons was established under the optimum conditions...
January 12, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29323783/chiral-ligand-exchange-countercurrent-chromatography-enantioseparation-of-amino-acids
#18
Qing Xiong, Jing Jin, Liqiong Lv, Zhisi Bu, Shengqiang Tong
This work deals with the enantioseparation of α-amino acids by chiral ligand exchange high-speed countercurrent chromatography using N-n-dodecyl-l-hydroxyproline as a chiral ligand and copper(II) as a transition metal ion. A biphasic solvent system composed of n-hexane/n-butanol/aqueous phase with different volume ratios was selected for each α-amino acid. The enantioseparation conditions were optimized by enantioselective liquid-liquid extractions, in which the main influence factors, including type of chiral ligand, concentration of chiral ligand and transition metal ion, separation temperature and pH of aqueous phase, were investigated for racemic phenylalanine...
January 11, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29323777/optimization-of-the-surface-modification-process-of-crosslinked-polythiol-coated-chiral-stationary-phases-synthesized-by-a-two-step-thiol-ene-click-reaction
#19
Kristina Schmitt, Michael Lämmerhofer
A new platform technology for the preparation of stable chiral stationary phases was successfully optimized. The chiral selector tert-butylcarbamoylquinine was firstly covalently connected to the polymer poly(3-mercaptopropyl)methylsiloxane by thiol-ene click reaction. Secondly, the quinine carbamate functionalized polysiloxane conjugate was coated onto the surface of vinyl modified silica particles and crosslinked via thiol-ene click reaction. The amount of polysiloxane, chiral selector, radical initiator, reaction solvent (chloroform and methanol), reaction time, and pore size of the supporting silica particles were varied and systematically optimized in terms of achievable plate numbers while maintaining simultaneously enantioselectivity...
January 11, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29323775/van-t-hoff-analysis-in-chiral-chromatography
#20
Leonid D Asnin, Maria V Stepanova
The present review discusses the theory and application of van't Hoff analysis in chiral chromatography, with main focus on liquid chromatography. The topics considered include the physical meaning of van't Hoff equation's parameters, interpretation of thermodynamic data in terms of retention and enantioseparation mechanisms, abnormal behavior of van't Hoff plots, and best practices to avoid biased results. This article is protected by copyright. All rights reserved.
January 11, 2018: Journal of Separation Science
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