Journal of Separation Science

Cover image for Vol. 37 Issue 24

December 2014

Volume 37, Issue 24

Pages 3595–3772

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Liquid Chromatography
    5. Gas Chromatography
    6. Sample Preparation
    7. Electro Driven Separations
    8. Other Techniques
    9. Acknowledgements
    1. You have free access to this content
      Functionalized graphene quantum dots loaded with free radicals combined with liquid chromatography and tandem mass spectrometry to screen radical scavenging natural antioxidants from Licorice and Scutellariae

      Guoying Wang, XiuLi Niu, Gaofeng Shi, Xuefu Chen, Ruixing Yao and Fuwen Chen

      Article first published online: 8 DEC 2014 | DOI: 10.1002/jssc.201470221

      Thumbnail image of graphical abstract

      (J. Sep. Sci. 2014, 37 (24), 3641–3648)

      This paper describes an approach to simultaneously evaluate the antioxidant power of a component versus radicals, and to identify it in two vegetal matrixes. This work includes the development of a new material, i.e. functionalized graphene quantum dots, able to adsorb radicals, thus facilitating their interaction between antioxidants contained in complex matrices. This fact is demonstrated by applying the method to plant extracts. Separation is performed with and without a preliminary exposure of the sample to specific free radicals on a ‘functional’ graphene quantum dots surface, which facilitates reaction between free radicals and potential antioxidants. The difference in chromatographic peak areas is used to identify potential antioxidants. The structure of the antioxidants in two samples (Radix Scutellariae and Licorice skin) is identified using MS/MS is and compared with standards. The approach is interesting and potentially useful. The electrochemical impedance spectroscopy was successfully employed to monitor the electrochemical characteristics of the complex plant extract screening system for the first time. The new screening approach can also be widely used for the detection and identification of antioxidants in other complex samples.

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Liquid Chromatography
    5. Gas Chromatography
    6. Sample Preparation
    7. Electro Driven Separations
    8. Other Techniques
    9. Acknowledgements
    1. You have free access to this content
      Contents: J. Sep. Science 24'14

      Article first published online: 8 DEC 2014 | DOI: 10.1002/jssc.201470222

  3. Liquid Chromatography

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Liquid Chromatography
    5. Gas Chromatography
    6. Sample Preparation
    7. Electro Driven Separations
    8. Other Techniques
    9. Acknowledgements
    1. Evaluation of gardenia yellow using crocetin from alkaline hydrolysis based on ultra high performance liquid chromatography and high-speed countercurrent chromatography (pages 3619–3624)

      Koichi Inoue, Chihiro Tanada, Hiroaki Nishikawa, Satoru Matsuda, Atsuko Tada, Yusai Ito, Jun Zhe Min, Kenichiro Todoroki, Naoki Sugimoto, Toshimasa Toyo'oka and Hiroshi Akiyama

      Article first published online: 12 NOV 2014 | DOI: 10.1002/jssc.201400793

  4. Gas Chromatography

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Liquid Chromatography
    5. Gas Chromatography
    6. Sample Preparation
    7. Electro Driven Separations
    8. Other Techniques
    9. Acknowledgements
    1. You have free access to this content
  5. Sample Preparation

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Liquid Chromatography
    5. Gas Chromatography
    6. Sample Preparation
    7. Electro Driven Separations
    8. Other Techniques
    9. Acknowledgements
    1. Comparison of different cleanup procedures for oil crops based on the development of a trace analytical method for the determination of pyraclostrobin and epoxiconazole (pages 3669–3676)

      Xinglu Pan, Fengshou Dong, Jun Xu, Xingang Liu, Youpu Cheng, Zenglong Chen, Na Liu, Xixi Chen, Yan Tao and Yongquan Zheng

      Article first published online: 6 NOV 2014 | DOI: 10.1002/jssc.201400596

    2. Multiresidue analysis of 59 nonallowed substances and other contaminants in cosmetics (pages 3684–3690)

      Jia Zhan, Mei-lin Ni, Hai-ying Zhao, Xiao-ming Ge, Xiao-yu He, Ju-yi Yin, Xue-jun Yu, Yuan-mu Fan and Zhi-qiang Huang

      Article first published online: 19 NOV 2014 | DOI: 10.1002/jssc.201400698

    3. Simultaneous extraction and determination of various pesticides in environmental waters (pages 3699–3705)

      Zulin Zhang, Thibault Lefebvre, Christine Kerr and Mark Osprey

      Article first published online: 4 NOV 2014 | DOI: 10.1002/jssc.201400855

  6. Electro Driven Separations

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Liquid Chromatography
    5. Gas Chromatography
    6. Sample Preparation
    7. Electro Driven Separations
    8. Other Techniques
    9. Acknowledgements
    1. Affinity capillary electrophoresis to evaluate the complex formation between poliovirus and nanobodies (pages 3729–3737)

      Hadewych Halewyck, Lise Schotte, Iuliana Oita, Bert Thys, Ann Van Eeckhaut, Yvan Vander Heyden and Bart Rombaut

      Article first published online: 12 NOV 2014 | DOI: 10.1002/jssc.201400406

  7. Other Techniques

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Liquid Chromatography
    5. Gas Chromatography
    6. Sample Preparation
    7. Electro Driven Separations
    8. Other Techniques
    9. Acknowledgements
  8. Acknowledgements

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Liquid Chromatography
    5. Gas Chromatography
    6. Sample Preparation
    7. Electro Driven Separations
    8. Other Techniques
    9. Acknowledgements

SEARCH

SEARCH BY CITATION