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Rapid preparation of methyltrimethoxy‐modified magnetic mesoporous silica as an effective solid‐phase extraction adsorbent

Published: Jan 11, 2018

Author(s): Shi‐Bin Qin, Yu‐Han Fan, Xiao‐Shui Li, Yuan Zhang, Shi‐Hua Qi

Journal: Journal of Separation Science

Abstract A time‐saving method was applied to synthesize methyltrimethoxy‐modified magnetic mesoporous silica with or without p‐toluenesulfonic acid as the catalyst for magnetic solid‐phase extraction. The synthesized materials were systematically characterized. Results demonstrated that methyltrimethoxy modified magnetic mesoporous silica with p‐toluenesulfonic acid as the catalyst has a relatively smaller aperture and extreme hydrophobicity (water contact...

Read More thumbnail image: Rapid preparation of methyltrimethoxymodified magnetic mesoporous silica as an effective solidphase extraction adsorbent

Rapid preparation of methyltrimethoxy‐modified magnetic mesoporous silica as an effective solid‐phase extraction adsorbent

Published: Jan 11, 2018

Author(s): Shi‐Bin Qin, Yu‐Han Fan, Xiao‐Shui Li, Yuan Zhang, Shi‐Hua Qi

Journal: Journal of Separation Science

Abstract A time‐saving method was applied to synthesize methyltrimethoxy‐modified magnetic mesoporous silica with or without p‐toluenesulfonic acid as the catalyst for magnetic solid‐phase extraction. The synthesized materials were systematically characterized. Results demonstrated that methyltrimethoxy modified magnetic mesoporous silica with p‐toluenesulfonic acid as the catalyst has a relatively smaller aperture and extreme hydrophobicity (water contact...

Read More thumbnail image: Rapid preparation of methyltrimethoxymodified magnetic mesoporous silica as an effective solidphase extraction adsorbent

Isolation of ellagic acid from pomegranate peel extract by hydrophobic interaction chromatography using graphene oxide grafted cotton fiber adsorbent

Published: Jan 11, 2018

Author(s): Rong Peng, Qijiayu Wu, Jingling Chen, Raja Ghosh, Xiaonong Chen

Journal: Journal of Separation Science

Abstract Ellagic acid, a natural polyphenol, was isolated from pomegranate peel extract by hydrophobic interaction using graphene oxide grafted cotton fiber as a stationary adsorbent. The grafted graphene oxide moieties served as hydrophobic interaction‐binding sites for ellagic acid adsorption. The graphene oxide grafted cotton fiber was made into a membrane‐like sheet in order to complete ellagic acid purification by using a...

Read More thumbnail image: Isolation of ellagic acid from pomegranate peel extract by hydrophobic interaction chromatography using graphene oxide grafted cotton fiber adsorbent

Isolation of ellagic acid from pomegranate peel extract by hydrophobic interaction chromatography using graphene oxide grafted cotton fiber adsorbent

Published: Jan 11, 2018

Author(s): Rong Peng, Qijiayu Wu, Jingling Chen, Raja Ghosh, Xiaonong Chen

Journal: Journal of Separation Science

Abstract Ellagic acid, a natural polyphenol, was isolated from pomegranate peel extract by hydrophobic interaction using graphene oxide grafted cotton fiber as a stationary adsorbent. The grafted graphene oxide moieties served as hydrophobic interaction‐binding sites for ellagic acid adsorption. The graphene oxide grafted cotton fiber was made into a membrane‐like sheet in order to complete ellagic acid purification by using a...

Read More thumbnail image: Isolation of ellagic acid from pomegranate peel extract by hydrophobic interaction chromatography using graphene oxide grafted cotton fiber adsorbent

Polarized Raman, FTIR, and DFT study of Na2Ti3O7 microcrystals

Published: Jan 11, 2018

Author(s): Fábio Lacerda Resende e Silva, Adailton Azevedo Araújo Filho, Mauricélio Bezerra Silva, Karla Balzuweit, Jean‐Louis Bantignies, Ewerton Wagner Santos Caetano, Roberto Luiz Moreira, Valder Nogueira Freire, Ariete Righi

Journal: Journal of Raman Spectroscopy

Abstract Sodium trititanate Na2Ti3O7 microcrystals were carefully prepared by sodium carbonate and titanium dioxide solid‐state reaction and characterized by scanning and transmission electron microscopies, selected area electron diffraction, X‐ray powder diffraction, and Raman and Fourier transform infrared spectroscopies. Electron microscopic techniques revealed that the samples were formed by elongated particles several microns...

Read More thumbnail image: Polarized Raman FTIR and DFT study of Na2Ti3O7 microcrystals

Polarized Raman, FTIR, and DFT study of Na2Ti3O7 microcrystals

Published: Jan 11, 2018

Author(s): Fábio Lacerda Resende e Silva, Adailton Azevedo Araújo Filho, Mauricélio Bezerra Silva, Karla Balzuweit, Jean‐Louis Bantignies, Ewerton Wagner Santos Caetano, Roberto Luiz Moreira, Valder Nogueira Freire, Ariete Righi

Journal: Journal of Raman Spectroscopy

Abstract Sodium trititanate Na2Ti3O7 microcrystals were carefully prepared by sodium carbonate and titanium dioxide solid‐state reaction and characterized by scanning and transmission electron microscopies, selected area electron diffraction, X‐ray powder diffraction, and Raman and Fourier transform infrared spectroscopies. Electron microscopic techniques revealed that the samples were formed by elongated particles several microns...

Read More thumbnail image: Polarized Raman FTIR and DFT study of Na2Ti3O7 microcrystals

Distinction and quantification of inorganic sulfur species including thiosulfate by X ‐ray fluorescence ( WD‐XRF )

Published: Jan 10, 2018

Author(s): Stephanie Hennings, Alexander Pleßow

Journal: X-Ray Spectrometry

Sulfur occurs in a variety of inorganic and organic compounds with oxidation states from −II up to +VI. Differentiation of these species in solid geochemical samples can be challenging because of oxidation processes during sample preparation by acidic digestion. Applying pressed powder pellets and an analysis by wavelength‐dispersive X‐ray fluorescence minimises reactions with oxidants and water. Main...

Read More thumbnail image: Distinction and quantification of inorganic sulfur species including thiosulfate by X ray fluorescence  WDXRF

Distinction and quantification of inorganic sulfur species including thiosulfate by X ‐ray fluorescence ( WD‐XRF )

Published: Jan 10, 2018

Author(s): Stephanie Hennings, Alexander Pleßow

Journal: X-Ray Spectrometry

Sulfur occurs in a variety of inorganic and organic compounds with oxidation states from −II up to +VI. Differentiation of these species in solid geochemical samples can be challenging because of oxidation processes during sample preparation by acidic digestion. Applying pressed powder pellets and an analysis by wavelength‐dispersive X‐ray fluorescence minimises reactions with oxidants and water. Main...

Read More thumbnail image: Distinction and quantification of inorganic sulfur species including thiosulfate by X ray fluorescence  WDXRF

LC‐MS/MS profiling of polyphenol‐enriched leaf, stem and root extracts of Korean Humulus japonicus Siebold & Zucc and determination of their antioxidant effects

Published: Jan 10, 2018

Author(s): Jin Young Choi, Kebede Taye Desta, Soo Jung Lee, Yun‐Hi Kim, Sung Chul Shin, Gon‐Sup Kim, Sung Joong Lee, Jae‐Han Shim, Ahmet Hacımüftüo, A. M. Abd El‐Aty

Journal: Biomedical Chromatography

Abstract Polyphenols from ethyl acetate extracts from the leaves, stems and roots of Korean Humulus japonicus were comprehensively profiled using liquid chromatography–electrospray ionization–tandem mass spectrometry. A total of 36 polyphenols were detected, of which 26 were structurally characterized based on their [M − H]− peak, tandem mass spectrometry fragmentation pattern, UV–vis absorption and published data. Validation data provided satisfactory ...

Read More thumbnail image: LCMSMS profiling of polyphenolenriched leaf stem and root extracts of Korean Humulus japonicus Siebold  Zucc and determination of their antioxidant effects

LC‐MS/MS profiling of polyphenol‐enriched leaf, stem and root extracts of Korean Humulus japonicus Siebold & Zucc and determination of their antioxidant effects

Published: Jan 10, 2018

Author(s): Jin Young Choi, Kebede Taye Desta, Soo Jung Lee, Yun‐Hi Kim, Sung Chul Shin, Gon‐Sup Kim, Sung Joong Lee, Jae‐Han Shim, Ahmet Hacımüftüo, A. M. Abd El‐Aty

Journal: Biomedical Chromatography

Abstract Polyphenols from ethyl acetate extracts from the leaves, stems and roots of Korean Humulus japonicus were comprehensively profiled using liquid chromatography–electrospray ionization–tandem mass spectrometry. A total of 36 polyphenols were detected, of which 26 were structurally characterized based on their [M − H]− peak, tandem mass spectrometry fragmentation pattern, UV–vis absorption and published data. Validation data provided satisfactory ...

Read More thumbnail image: LCMSMS profiling of polyphenolenriched leaf stem and root extracts of Korean Humulus japonicus Siebold  Zucc and determination of their antioxidant effects

The issue of HPLC determination of endogenous lipoic acid in human plasma

Published: Jan 10, 2018

Author(s): Soňa Sechovcová, Pavla Královcová, Roman Kanďár, Karel Ventura

Journal: Biomedical Chromatography

Abstract Lipoic acid (LA) is used extensively as a therapeutic agent for the treatment of various diseases. Many methods have been reported for the determination of LA plasma levels and its metabolites after its supplementation, but available information concerning endogenous plasma levels is still scarce. Studies which directly focused on determining the endogenous plasma levels provided highly controversial results, <4.9 nmol/L...

Read More thumbnail image: The issue of HPLC determination of endogenous lipoic acid in human plasma

The issue of HPLC determination of endogenous lipoic acid in human plasma

Published: Jan 10, 2018

Author(s): Soňa Sechovcová, Pavla Královcová, Roman Kanďár, Karel Ventura

Journal: Biomedical Chromatography

Abstract Lipoic acid (LA) is used extensively as a therapeutic agent for the treatment of various diseases. Many methods have been reported for the determination of LA plasma levels and its metabolites after its supplementation, but available information concerning endogenous plasma levels is still scarce. Studies which directly focused on determining the endogenous plasma levels provided highly controversial results, <4.9 nmol/L...

Read More thumbnail image: The issue of HPLC determination of endogenous lipoic acid in human plasma

A fast and accurate isotope dilution GC‐IT‐MS/MS method for determination of eugenol in different tissues of fish: Application to a depletion study in mandarin fish

Published: Jan 10, 2018

Author(s): Yongtao Liu, Xiaohui Ai, Le Li, Jincheng Li, Hong Yang

Journal: Biomedical Chromatography

Abstract An accurate, rapid and effective method was established for determination of eugenol in plasma, muscle, skin, liver, kidney and gill of fish using gas chromatography–ion trap tandem mass spectrometry. Samples of muscle, skin, liver, kidney and gill were prepared using the modified QuEChERS (quick, easy, cheap, effective, rugged and safe) procedure, and a plasma sample was prepared by a liquid–liquid extraction procedure....

Read More thumbnail image: A fast and accurate isotope dilution GCITMSMS method for determination of eugenol in different tissues of fish Application to a depletion study in mandarin fish

A fast and accurate isotope dilution GC‐IT‐MS/MS method for determination of eugenol in different tissues of fish: Application to a depletion study in mandarin fish

Published: Jan 10, 2018

Author(s): Yongtao Liu, Xiaohui Ai, Le Li, Jincheng Li, Hong Yang

Journal: Biomedical Chromatography

Abstract An accurate, rapid and effective method was established for determination of eugenol in plasma, muscle, skin, liver, kidney and gill of fish using gas chromatography–ion trap tandem mass spectrometry. Samples of muscle, skin, liver, kidney and gill were prepared using the modified QuEChERS (quick, easy, cheap, effective, rugged and safe) procedure, and a plasma sample was prepared by a liquid–liquid extraction procedure....

Read More thumbnail image: A fast and accurate isotope dilution GCITMSMS method for determination of eugenol in different tissues of fish Application to a depletion study in mandarin fish

Analysis of thyreostats in bovine feces using ultra high performance liquid chromatography with tandem mass spectrometry

Published: Jan 10, 2018

Author(s): Sebastian Witek, Barbara Wozniak, Iwona Matraszek‐Zuchowska, Andrzej Posyniak

Journal: Journal of Separation Science

Abstract A method based on ultra‐high performance liquid chromatography was developed and validated to detect six thyreostatic compounds: tapazole, thiouracil, methylthiouracil, dimethylthiouracil, propylthiouracil, and phenylthiouracil in faeces of bovine. Thyreostats were extracted from the matrix with a mixture of methanol and buffer (pH = 8). Next step was derivatization of analytes with 3‐iodobenzylbromide. The liquid...

Read More thumbnail image: Analysis of thyreostats in bovine feces using ultra high performance liquid chromatography with tandem mass spectrometry

Analysis of thyreostats in bovine feces using ultra high performance liquid chromatography with tandem mass spectrometry

Published: Jan 10, 2018

Author(s): Sebastian Witek, Barbara Wozniak, Iwona Matraszek‐Zuchowska, Andrzej Posyniak

Journal: Journal of Separation Science

Abstract A method based on ultra‐high performance liquid chromatography was developed and validated to detect six thyreostatic compounds: tapazole, thiouracil, methylthiouracil, dimethylthiouracil, propylthiouracil, and phenylthiouracil in faeces of bovine. Thyreostats were extracted from the matrix with a mixture of methanol and buffer (pH = 8). Next step was derivatization of analytes with 3‐iodobenzylbromide. The liquid...

Read More thumbnail image: Analysis of thyreostats in bovine feces using ultra high performance liquid chromatography with tandem mass spectrometry

Thermodynamic enantioseparation behavior of phenylthiohydantoin‐amino acid derivatives in supercritical fluid chromatography on polysaccharide chiral stationary phases

Published: Jan 10, 2018

Author(s): Syame Khater, Baptiste Canault, Taoufik Azzimani, Pascal Bonnet, Caroline West

Journal: Journal of Separation Science

Abstract Thirteen pairs of enantiomers belonging to the same structural family (phenylthiohydantoin‐amino acids) were analyzed on two polysaccharide chiral stationary phases, namely, tris‐(3,5‐dimethylphenylcarbamate) of amylose (Chiralpak AD‐H) or cellulose (Chiralcel OD‐H) in supercritical fluid chromatography with a carbon dioxide/methanol mobile phase (90:10 v/v). Five different temperatures (5, 10, 20, 30, 40°C) were applied to...

Read More thumbnail image: Thermodynamic enantioseparation behavior of phenylthiohydantoinamino acid derivatives in supercritical fluid chromatography on polysaccharide chiral stationary phases

Thermodynamic enantioseparation behavior of phenylthiohydantoin‐amino acid derivatives in supercritical fluid chromatography on polysaccharide chiral stationary phases

Published: Jan 10, 2018

Author(s): Syame Khater, Baptiste Canault, Taoufik Azzimani, Pascal Bonnet, Caroline West

Journal: Journal of Separation Science

Abstract Thirteen pairs of enantiomers belonging to the same structural family (phenylthiohydantoin‐amino acids) were analyzed on two polysaccharide chiral stationary phases, namely, tris‐(3,5‐dimethylphenylcarbamate) of amylose (Chiralpak AD‐H) or cellulose (Chiralcel OD‐H) in supercritical fluid chromatography with a carbon dioxide/methanol mobile phase (90:10 v/v). Five different temperatures (5, 10, 20, 30, 40°C) were applied to...

Read More thumbnail image: Thermodynamic enantioseparation behavior of phenylthiohydantoinamino acid derivatives in supercritical fluid chromatography on polysaccharide chiral stationary phases

Simultaneous determination and validation of emtricitabine, rilpivirine and tenofovir from biological samples using LC and CE methods

Published: Jan 9, 2018

Author(s): Mehmet Gumustas, Mehmet Gokhan Caglayan, Feyyaz Onur, Sibel A. Ozkan

Journal: Biomedical Chromatography

Abstract A combination of antiretroviral agents is frequently used in effective treatment of the human immunodeficiency virus infection. In this study, two different separation methods are presented for the simultaneous determination of emtricitabine, rilpivirine and tenofovir from raw materials and urine samples. Developed liquid chromatography and capillary electrophoresis methods were thoroughly optimized for high analytical...

Read More thumbnail image: Simultaneous determination and validation of emtricitabine rilpivirine and tenofovir from biological samples using LC and CE methods

Simultaneous determination and validation of emtricitabine, rilpivirine and tenofovir from biological samples using LC and CE methods

Published: Jan 9, 2018

Author(s): Mehmet Gumustas, Mehmet Gokhan Caglayan, Feyyaz Onur, Sibel A. Ozkan

Journal: Biomedical Chromatography

Abstract A combination of antiretroviral agents is frequently used in effective treatment of the human immunodeficiency virus infection. In this study, two different separation methods are presented for the simultaneous determination of emtricitabine, rilpivirine and tenofovir from raw materials and urine samples. Developed liquid chromatography and capillary electrophoresis methods were thoroughly optimized for high analytical...

Read More thumbnail image: Simultaneous determination and validation of emtricitabine rilpivirine and tenofovir from biological samples using LC and CE methods
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