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Acid Radical

The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform

Furio Brighenti – 1st expert on this subject based on the ideXlab platform

  • Application of the 2,2‘-Azinobis(3-ethylbenzothiazoline-6-sulfonic Acid) Radical Cation Assay to a Flow Injection System for the Evaluation of Antioxidant Activity of Some Pure Compounds and Beverages
    Journal of Agricultural and Food Chemistry, 2003
    Co-Authors: Nicoletta Pellegrini, Barbara Colombi, Marta Bianchi, Furio Brighenti

    Abstract:

    The 2,2‘-azinobis(3-ethylbenzothiazoline-6-sulfonic Acid) Radical cation (ABTS•+) assay was adapted to a flow injection (FI) system to obtain a sensitive and rapid technique for the monitoring of antioxidant activity of pure compounds and complex matrixes, such as beverages and food extracts. The FI system includes a HPLC pump that flows the mobile phase (a solution of ABTS•+ in ethanol) through a 20 μL loop injector, a single bead string reactor filled with Acid-washed silanized beads, a delay coil and a photodiode array UV−visible detector. The technique was very sensitive, with limits of detection and of quantification of 4.14 and 9.29 μmol of Trolox/L, respectively, and demonstrated high repeatability and reproducibility. The proposed technique was then applied to the evaluation of the antioxidant activity of some pure compounds, demonstrating good agreement with published data obtained by the original spectrophotometric ABTS•+ assay. Finally, the total antioxidant activity of 10 beverages was determi…

  • application of the 2 2 azinobis 3 ethylbenzothiazoline 6 sulfonic Acid Radical cation assay to a flow injection system for the evaluation of antioxidant activity of some pure compounds and beverages
    Journal of Agricultural and Food Chemistry, 2003
    Co-Authors: Nicoletta Pellegrini, Barbara Colombi, Marta Bianchi, Furio Brighenti

    Abstract:

    The 2,2‘-azinobis(3-ethylbenzothiazoline-6-sulfonic Acid) Radical cation (ABTS•+) assay was adapted to a flow injection (FI) system to obtain a sensitive and rapid technique for the monitoring of antioxidant activity of pure compounds and complex matrixes, such as beverages and food extracts. The FI system includes a HPLC pump that flows the mobile phase (a solution of ABTS•+ in ethanol) through a 20 μL loop injector, a single bead string reactor filled with Acid-washed silanized beads, a delay coil and a photodiode array UV−visible detector. The technique was very sensitive, with limits of detection and of quantification of 4.14 and 9.29 μmol of Trolox/L, respectively, and demonstrated high repeatability and reproducibility. The proposed technique was then applied to the evaluation of the antioxidant activity of some pure compounds, demonstrating good agreement with published data obtained by the original spectrophotometric ABTS•+ assay. Finally, the total antioxidant activity of 10 beverages was determi…

Zhigang Zou – 2nd expert on this subject based on the ideXlab platform

  • An anion-controlled crystal growth route to Zn2GeO4 nanorods for efficient photocatalytic conversion of CO2 into CH4
    Dalton Transactions, 2013
    Co-Authors: Shicheng Yan, Jiajia Wang, Zhigang Zou

    Abstract:

    For photoreduction of CO2 into solar fuels driven by photocatalysis, a means to convert solar energy into chemical energy, a semiconductor photocatalyst with a specific crystal surface and high chemical stability is expected to achieve high activity and selectivity. Here, (110) facets exposed Zn2GeO4 nanorods with different aspect ratios were prepared by the ion exchange reaction between Na2GeO3 colloidal solution and various zinc salt solutions. The aspect ratio of Zn2GeO4 can be adjusted in the wide range from 2.5 : 1 to 20 : 1, depending on the Acid Radical. In this synthetic route, the Na2GeO3 precursor is a strong base, but strong Acids such as HCl, HNO3 and H2SO4 as by-products were formed, meaning that the Zn2GeO4 single-crystal nanorods have good chemical stability in Acid as well as in base. The excellent hydrothermal stability for the Zn2GeO4 nanorods in NaOH solution provides a simple method to obtain a hydroxylated surface for high performance in the photocatalytic conversion of CO2 and H2O to hydrocarbons fuels.

  • An anion-controlled crystal growth route to Zn2GeO4 nanorods for efficient photocatalytic conversion of CO2 into CH 4
    Dalton Transactions, 2013
    Co-Authors: Shicheng Yan, Jiajia Wang, Zhigang Zou

    Abstract:

    For photoreduction of CO2 into solar fuels driven by photocatalysis, a means to convert solar energy into chemical energy, a semiconductor photocatalyst with a specific crystal surface and high chemical stability is expected to achieve high activity and selectivity. Here, (110) facets exposed Zn2GeO4 nanorods with different aspect ratios were prepared by the ion exchange reaction between Na2GeO3 colloidal solution and various zinc salt solutions. The aspect ratio of Zn2GeO4 can be adjusted in the wide range from 2.5:1 to 20:1, depending on the Acid Radical. In this synthetic route, the Na2GeO3 precursor is a strong base, but strong Acids such as HCl, HNO3 and H2SO4 as by-products were formed, meaning that the Zn2GeO4 single-crystal nanorods have good chemical stability in Acid as well as in base. The excellent hydrothermal stability for the Zn2GeO4 nanorods in NaOH solution provides a simple method to obtain a hydroxylated surface for high performance in the photocatalytic conversion of CO2 and H2O to hydrocarbons fuels.

Nicoletta Pellegrini – 3rd expert on this subject based on the ideXlab platform

  • Application of the 2,2‘-Azinobis(3-ethylbenzothiazoline-6-sulfonic Acid) Radical Cation Assay to a Flow Injection System for the Evaluation of Antioxidant Activity of Some Pure Compounds and Beverages
    Journal of Agricultural and Food Chemistry, 2003
    Co-Authors: Nicoletta Pellegrini, Barbara Colombi, Marta Bianchi, Furio Brighenti

    Abstract:

    The 2,2‘-azinobis(3-ethylbenzothiazoline-6-sulfonic Acid) Radical cation (ABTS•+) assay was adapted to a flow injection (FI) system to obtain a sensitive and rapid technique for the monitoring of antioxidant activity of pure compounds and complex matrixes, such as beverages and food extracts. The FI system includes a HPLC pump that flows the mobile phase (a solution of ABTS•+ in ethanol) through a 20 μL loop injector, a single bead string reactor filled with Acid-washed silanized beads, a delay coil and a photodiode array UV−visible detector. The technique was very sensitive, with limits of detection and of quantification of 4.14 and 9.29 μmol of Trolox/L, respectively, and demonstrated high repeatability and reproducibility. The proposed technique was then applied to the evaluation of the antioxidant activity of some pure compounds, demonstrating good agreement with published data obtained by the original spectrophotometric ABTS•+ assay. Finally, the total antioxidant activity of 10 beverages was determi…

  • application of the 2 2 azinobis 3 ethylbenzothiazoline 6 sulfonic Acid Radical cation assay to a flow injection system for the evaluation of antioxidant activity of some pure compounds and beverages
    Journal of Agricultural and Food Chemistry, 2003
    Co-Authors: Nicoletta Pellegrini, Barbara Colombi, Marta Bianchi, Furio Brighenti

    Abstract:

    The 2,2‘-azinobis(3-ethylbenzothiazoline-6-sulfonic Acid) Radical cation (ABTS•+) assay was adapted to a flow injection (FI) system to obtain a sensitive and rapid technique for the monitoring of antioxidant activity of pure compounds and complex matrixes, such as beverages and food extracts. The FI system includes a HPLC pump that flows the mobile phase (a solution of ABTS•+ in ethanol) through a 20 μL loop injector, a single bead string reactor filled with Acid-washed silanized beads, a delay coil and a photodiode array UV−visible detector. The technique was very sensitive, with limits of detection and of quantification of 4.14 and 9.29 μmol of Trolox/L, respectively, and demonstrated high repeatability and reproducibility. The proposed technique was then applied to the evaluation of the antioxidant activity of some pure compounds, demonstrating good agreement with published data obtained by the original spectrophotometric ABTS•+ assay. Finally, the total antioxidant activity of 10 beverages was determi…