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Investigation of cadmium accumulation mechanism in hepatopancreas of Patinopecten yessoensis by synchrotron radiation X‐ray absorption fine structure and synchrotron radiation X‐ray fluorescence analyses

Published: Jan 4, 2018

Author(s): Kenji Terada, Yoshinari Abe, Izumi Nakai, Shingo Maruhashi, Shigetoshi Miura, Kotaro Honda, Yasuhiro Tomooka

Journal: X-Ray Spectrometry

Chemical state of cadmium in a hepatopancreas of a scallop (Patinopecten yessoensis) was studied by means of synchrotron radiation‐based X‐ray analytical techniques. X‐ray absorption fine structure (XAFS) and X‐ray fluorescence (XRF) imaging were used to identify the chemical state and the distribution of cadmium in the hepatopancreas, respectively. The results of in vivo Cd K‐edge XAFS suggested that the neighboring atoms of the cadmium in the...

Read More thumbnail image: Investigation of cadmium accumulation mechanism in hepatopancreas of Patinopecten yessoensis by synchrotron radiation Xray absorption fine structure and synchrotron radiation Xray fluorescence analyses

Electrochromatographic performance of graphene and graphene oxide modified silica particles packed capillary columns

Published: Jan 4, 2018

Author(s): Hongyan Zhao, Yizhou Wang, Danyu Zhang, Heyong Cheng, Yuanchao Wang

Journal: ELECTROPHORESIS

Abstract Graphene oxide functionalized silica microspheres (GO@SiO2) were synthesized based on condensation reaction between amino from aminosilica particles and carboxyl groups from GO. Reduction of GO@SiO2 with hydrazinium hydroxide generated graphene modified silica particles (G@SiO2). GO@SiO2 and G@SiO2 packed capillary columns for capillary electrochromatography were thereafter fabricated by pressure slurry packing with single‐particle ...

Read More thumbnail image: Electrochromatographic performance of graphene and graphene oxide modified silica particles packed capillary columns

Electrochromatographic performance of graphene and graphene oxide modified silica particles packed capillary columns

Published: Jan 4, 2018

Author(s): Hongyan Zhao, Yizhou Wang, Danyu Zhang, Heyong Cheng, Yuanchao Wang

Journal: ELECTROPHORESIS

Abstract Graphene oxide functionalized silica microspheres (GO@SiO2) were synthesized based on condensation reaction between amino from aminosilica particles and carboxyl groups from GO. Reduction of GO@SiO2 with hydrazinium hydroxide generated graphene modified silica particles (G@SiO2). GO@SiO2 and G@SiO2 packed capillary columns for capillary electrochromatography were thereafter fabricated by pressure slurry packing with single‐particle ...

Read More thumbnail image: Electrochromatographic performance of graphene and graphene oxide modified silica particles packed capillary columns

Direct determination of amino acids in brewery worts produced by different processes by capillary zone electrophoresis

Published: Jan 4, 2018

Author(s): Renata Corrêa de Carvalho, Thiago Rocha dos Santos Mathias, Annibal Duarte Pereira Netto, Flávia Ferreira de Carvalho Marques

Journal: ELECTROPHORESIS

Abstract The direct and simultaneous determination of cysteine, histidine, phenylalanine, lysine, tryptophan and arginine in brewery worts by capillary zone electrophoresis (CZE) was applied to evaluate the effects of temperature control and protease supplementation during mashing on the changes of these amino acids (AAs) wort composition. A cation exchange resin was used for AAs extraction from wort samples prior to CZE...

Read More thumbnail image: Direct determination of amino acids in brewery worts produced by different processes by capillary zone electrophoresis

Direct determination of amino acids in brewery worts produced by different processes by capillary zone electrophoresis

Published: Jan 4, 2018

Author(s): Renata Corrêa de Carvalho, Thiago Rocha dos Santos Mathias, Annibal Duarte Pereira Netto, Flávia Ferreira de Carvalho Marques

Journal: ELECTROPHORESIS

Abstract The direct and simultaneous determination of cysteine, histidine, phenylalanine, lysine, tryptophan and arginine in brewery worts by capillary zone electrophoresis (CZE) was applied to evaluate the effects of temperature control and protease supplementation during mashing on the changes of these amino acids (AAs) wort composition. A cation exchange resin was used for AAs extraction from wort samples prior to CZE...

Read More thumbnail image: Direct determination of amino acids in brewery worts produced by different processes by capillary zone electrophoresis

Electric double layer electrostatics of lipid‐bilayer‐encapsulated nanoparticles: Toward a better understanding of protocell electrostatics

Published: Jan 4, 2018

Author(s): Haoyuan Jing, Siddhartha Das

Journal: ELECTROPHORESIS

Abstract Lipid‐bilayer‐encapsulated nanoparticles (LBLENPs) or NP‐supported LBL systems, such as protocells (which are lipid bilayer encapsulated mesoporous silica nanoparticles or MSNPs) have received extensive attention for applications like targeted drug and gene deliveries, multimodal diagnostics, characterization of membrane‐geometry sensitive molecules, etc. Very often electrostatic‐mediated interactions have been hypothesized...

Read More thumbnail image: Electric double layer electrostatics of lipidbilayerencapsulated nanoparticles Toward a better understanding of protocell electrostatics

Electric double layer electrostatics of lipid‐bilayer‐encapsulated nanoparticles: Toward a better understanding of protocell electrostatics

Published: Jan 4, 2018

Author(s): Haoyuan Jing, Siddhartha Das

Journal: ELECTROPHORESIS

Abstract Lipid‐bilayer‐encapsulated nanoparticles (LBLENPs) or NP‐supported LBL systems, such as protocells (which are lipid bilayer encapsulated mesoporous silica nanoparticles or MSNPs) have received extensive attention for applications like targeted drug and gene deliveries, multimodal diagnostics, characterization of membrane‐geometry sensitive molecules, etc. Very often electrostatic‐mediated interactions have been hypothesized...

Read More thumbnail image: Electric double layer electrostatics of lipidbilayerencapsulated nanoparticles Toward a better understanding of protocell electrostatics

Insights into the uptake, metabolization, and translocation of four non‐steroidal anti‐inflammatory drugs in cress ( Lepidium sativum ) by HPLC‐MS 2

Published: Jan 4, 2018

Author(s): Lisa Emhofer, Markus Himmelsbach, Wolfgang Buchberger, Christian W. Klampfl

Journal: ELECTROPHORESIS

Abstract The metabolization of four non‐steroidal anti‐inflammatory drugs by cress (Lepidium sativum) was investigated using a HPLC‐MS2 method. Cress was grown hydroponically in water containing 0.1 mg/L of each drug for investigations on the kinetics of drug uptake and metabolization over a growing period of 12 days. It could be shown that the parent drugs are metabolized and the abundance of both the parent drug and the metabolites...

Read More thumbnail image: Insights into the uptake metabolization and translocation of four nonsteroidal antiinflammatory drugs in cress  Lepidium sativum  by HPLCMS 2

Insights into the uptake, metabolization, and translocation of four non‐steroidal anti‐inflammatory drugs in cress ( Lepidium sativum ) by HPLC‐MS 2

Published: Jan 4, 2018

Author(s): Lisa Emhofer, Markus Himmelsbach, Wolfgang Buchberger, Christian W. Klampfl

Journal: ELECTROPHORESIS

Abstract The metabolization of four non‐steroidal anti‐inflammatory drugs by cress (Lepidium sativum) was investigated using a HPLC‐MS2 method. Cress was grown hydroponically in water containing 0.1 mg/L of each drug for investigations on the kinetics of drug uptake and metabolization over a growing period of 12 days. It could be shown that the parent drugs are metabolized and the abundance of both the parent drug and the metabolites...

Read More thumbnail image: Insights into the uptake metabolization and translocation of four nonsteroidal antiinflammatory drugs in cress  Lepidium sativum  by HPLCMS 2

Determination of telbivudine in the plasma of chronic hepatitis B patients in long‐term treatment by high‐performance liquid chromatographic–tandem mass spectrometry

Published: Jan 3, 2018

Author(s): Bicui Chen, Li Chen, Cai Cheng, Mingkang Zhong, Xiaojin Shi, Jiming Zhang, Bin Wang

Journal: Biomedical Chromatography

Abstract Creatine kinase elevation is commonly reported in telbivudine‐treated patients. However, little is known about the relationship between this adverse drug reaction and plasma concentration. In this study, a sensitive, rapid and safe quantitative bioanalytical method has been established by using LC‐MS/MS for the determination of telbivudine in a clinical study of chronic hepatitis B patients. The assay was linear in a...

Read More thumbnail image: Determination of telbivudine in the plasma of chronic hepatitis B patients in longterm treatment by highperformance liquid chromatographictandem mass spectrometry

Determination of telbivudine in the plasma of chronic hepatitis B patients in long‐term treatment by high‐performance liquid chromatographic–tandem mass spectrometry

Published: Jan 3, 2018

Author(s): Bicui Chen, Li Chen, Cai Cheng, Mingkang Zhong, Xiaojin Shi, Jiming Zhang, Bin Wang

Journal: Biomedical Chromatography

Abstract Creatine kinase elevation is commonly reported in telbivudine‐treated patients. However, little is known about the relationship between this adverse drug reaction and plasma concentration. In this study, a sensitive, rapid and safe quantitative bioanalytical method has been established by using LC‐MS/MS for the determination of telbivudine in a clinical study of chronic hepatitis B patients. The assay was linear in a...

Read More thumbnail image: Determination of telbivudine in the plasma of chronic hepatitis B patients in longterm treatment by highperformance liquid chromatographictandem mass spectrometry

A novel fast method for aqueous derivatization of THC, OH‐THC and THC‐COOH in human whole blood and urine samples for routine forensic analyses

Published: Jan 3, 2018

Author(s): Fabio Stefanelli, Federica Giorgia Pesci, Mario Giusiani, Silvio Chericoni

Journal: Biomedical Chromatography

Abstract A novel aqueous in situ derivatization procedure with propyl chloroformate (PCF) for the simultaneous, quantitative analysis of Δ9‐tetrahydrocannabinol (THC), 11‐hydroxy‐Δ9‐tetrahydrocannabinol (OH‐THC) and 11‐nor‐Δ9‐tetrahydrocannabinol‐carboxylic acid (THC‐COOH) in human blood and urine is proposed. Unlike current methods based on the silylating agent [N,O‐bis(trimethylsilyl)trifluoroacetamide] added in an anhydrous environment, this new...

Read More thumbnail image: A novel fast method for aqueous derivatization of THC OHTHC and THCCOOH in human whole blood and urine samples for routine forensic analyses

A novel fast method for aqueous derivatization of THC, OH‐THC and THC‐COOH in human whole blood and urine samples for routine forensic analyses

Published: Jan 3, 2018

Author(s): Fabio Stefanelli, Federica Giorgia Pesci, Mario Giusiani, Silvio Chericoni

Journal: Biomedical Chromatography

Abstract A novel aqueous in situ derivatization procedure with propyl chloroformate (PCF) for the simultaneous, quantitative analysis of Δ9‐tetrahydrocannabinol (THC), 11‐hydroxy‐Δ9‐tetrahydrocannabinol (OH‐THC) and 11‐nor‐Δ9‐tetrahydrocannabinol‐carboxylic acid (THC‐COOH) in human blood and urine is proposed. Unlike current methods based on the silylating agent [N,O‐bis(trimethylsilyl)trifluoroacetamide] added in an anhydrous environment, this new...

Read More thumbnail image: A novel fast method for aqueous derivatization of THC OHTHC and THCCOOH in human whole blood and urine samples for routine forensic analyses

Qualitative analysis of flavors and fragrances added to tea by using GC–MS

Published: Jan 3, 2018

Author(s): Jianwu Wang, Yuanxin Hang, Tingting Yan, Jiahui Liang, Zhiqiang Huang, Huilan Xu

Journal: Journal of Separation Science

Abstract A precise identification method was developed to identify the flavors and fragrances added to tea matrix artificially using gas chromatography with mass spectrometry and gas chromatography with quadrupole time‐of‐flight mass spectrometry. The proposed method was based on the corresponding “three‐column retention indices, two exact mass numbers, one mass spectrum matching degree” database of 40 kinds of common flavors and...

Read More thumbnail image: Qualitative analysis of flavors and fragrances added to tea by using GCMS

Surfactant‐assisted electromembrane extraction combined with cyclodextrin‐modified capillary electrophoresis for the separation and quantification of Tranylcypromine enantiomers in biological samples

Published: Jan 3, 2018

Author(s): Ali Reza Fakhari, Hasan Mohammadi Kosalar, Sajad Asadi, Kobra Sadat Hasheminasab

Journal: Journal of Separation Science

Abstract Surfactant‐assisted electromembrane extraction coupled with cyclodextrin‐modified capillary electrophoresis was developed for the separation and determination of Tranylcypromine enantiomers in biological samples. This combination would provide a new strategy for selective and sensitive determination of target analytes. The addition of surfactant in the donor solution improved the analyte transport into the lumen of hollow...

Read More thumbnail image: Surfactantassisted electromembrane extraction combined with cyclodextrinmodified capillary electrophoresis for the separation and quantification of Tranylcypromine enantiomers in biological samples

Isolation and purification of food‐grade C‐phycocyanin from Arthrospira platensis and its determination in confectionery by HPLC with diode array detection

Published: Jan 3, 2018

Author(s): Maria Kissoudi, Ioannis Sarakatsianos, Victoria Samanidou

Journal: Journal of Separation Science

Abstract C‐Phycocyanin is the major phycobiliprotein in Arthrospira platensis, also known as Spirulina, which is a cyanobacterium used as a dietary supplement because of its powerful effects on body and brain. C‐phycocyanin is a blue‐colored accessory photosynthetic pigment with multiple applications in food industry as natural dye or additive, and in pharmaceuticals. This study presents a simple protocol for the extraction and purification of...

Read More thumbnail image: Isolation and purification of foodgrade Cphycocyanin from Arthrospira platensis and its determination in confectionery by HPLC with diode array detection

Liquid chromatographic resolution of proline and pipecolic acid derivatives on chiral stationary phases based on (+)‐(18‐crown‐6)‐2,3,11,12‐tetracarboxylic acid

Published: Jan 2, 2018

Author(s): Eun Sol Cho, Ji Yeong Sung, Jong Sung Jin, Myung Ho Hyun

Journal: Journal of Separation Science

Abstract Two liquid chromatographic chiral stationary phases based on (+)‐(18‐crown‐6)‐2,3,11,12‐tetracarboxylic acid were applied to the resolution of the amide derivatives of cyclic α‐amino acids including proline and pipecolic acid. Among the five amide derivatives of proline, aniline amide was resolved best on the first chiral stationary phase, which contains two N–H tethering amide groups, with the separation factor of 1.31 and...

Read More thumbnail image: Liquid chromatographic resolution of proline and pipecolic acid derivatives on chiral stationary phases based on 18crown6231112tetracarboxylic acid

Liquid chromatographic resolution of proline and pipecolic acid derivatives on chiral stationary phases based on (+)‐(18‐crown‐6)‐2,3,11,12‐tetracarboxylic acid

Published: Jan 2, 2018

Author(s): Eun Sol Cho, Ji Yeong Sung, Jong Sung Jin, Myung Ho Hyun

Journal: Journal of Separation Science

Abstract Two liquid chromatographic chiral stationary phases based on (+)‐(18‐crown‐6)‐2,3,11,12‐tetracarboxylic acid were applied to the resolution of the amide derivatives of cyclic α‐amino acids including proline and pipecolic acid. Among the five amide derivatives of proline, aniline amide was resolved best on the first chiral stationary phase, which contains two N–H tethering amide groups, with the separation factor of 1.31 and...

Read More thumbnail image: Liquid chromatographic resolution of proline and pipecolic acid derivatives on chiral stationary phases based on 18crown6231112tetracarboxylic acid

Determination of the transformation of ginsenosides in Ginseng Radix et Rhizoma during decoction with water using ultra‐fast liquid chromatography coupled with tandem mass spectrometry

Published: Jan 2, 2018

Author(s): Lei Zhang, Qi‐Le Zhou, Xiu‐Wei Yang

Journal: Journal of Separation Science

Abstract This study was conducted to determine the variations of ginsenosides in Ginseng Radix et Rhizoma when using different preparation solvents and explore the major factors for changes. With an established ultra‐fast liquid chromatography coupled with tandem mass spectrometry method which could quantify 52 ginsenosides, the extraction differences were characterized and compared using different solvents (water, 70% aqueous...

Read More thumbnail image: Determination of the transformation of ginsenosides in Ginseng Radix et Rhizoma during decoction with water using ultrafast liquid chromatography coupled with tandem mass spectrometry

Determination of the transformation of ginsenosides in Ginseng Radix et Rhizoma during decoction with water using ultra‐fast liquid chromatography coupled with tandem mass spectrometry

Published: Jan 2, 2018

Author(s): Lei Zhang, Qi‐Le Zhou, Xiu‐Wei Yang

Journal: Journal of Separation Science

Abstract This study was conducted to determine the variations of ginsenosides in Ginseng Radix et Rhizoma when using different preparation solvents and explore the major factors for changes. With an established ultra‐fast liquid chromatography coupled with tandem mass spectrometry method which could quantify 52 ginsenosides, the extraction differences were characterized and compared using different solvents (water, 70% aqueous...

Read More thumbnail image: Determination of the transformation of ginsenosides in Ginseng Radix et Rhizoma during decoction with water using ultrafast liquid chromatography coupled with tandem mass spectrometry
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