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Aldonic Acids

The Experts below are selected from a list of 201 Experts worldwide ranked by ideXlab platform

Francois Fajula – 1st expert on this subject based on the ideXlab platform

  • the catalysis of the ruff oxidative degradation of Aldonic Acids by copper ii containing solids
    Journal of Catalysis, 2002
    Co-Authors: Gwenaelle Hourdin, Alain Germain, Claude Moreau, Francois Fajula

    Abstract:

    The catalysis of the Ruff oxidative degradation of calcium D-gluconate to D-arabinose by aqueous diluted hydrogen peroxide was investigated using copper(II)-containing solids: zeolites and resins. Among zeolites, copper(II)-exchanged Y faujasite has given good results, similar to homogeneous copper catalysts. Only minute amounts of soluble copper were detected at the end of the reaction and the recovered solid was recycled twice without diminution of efficiency. However, it was not true heterogeneous catalysis because the chelating gluconate anion leached copper right from the beginning of the reaction. So, the catalysis occurred in solution but the metal precipitated again at the end of the reaction, when all the gluconate was consumed. Copper (II) iminodiacetic resin, in which the metal cation is more strongly bound than in the gluconate complex, was not active. This demonstrates that copper(II) must be in solution in order to be active.

  • the catalysis of the ruff oxidative degradation of Aldonic Acids by titanium containing zeolites
    Catalysis Letters, 2000
    Co-Authors: Gwenaelle Hourdin, Alain Germain, Claude Moreau, Francois Fajula

    Abstract:

    Ti‐BEA and Ti‐FAU, obtained by post‐synthesis treatment, and TS‐1, obtained by direct hydrothermal synthesis, have been tested as catalysts for the Ruff oxidative degradation of calcium d‐gluconate to d‐arabinose using diluted hydrogen peroxide as oxidant. Only large‐pore zeolites Ti‐BEA and Ti‐FAU were found to be active. It was shown, in particular, that a very rapid leaching of titanium occurred and that the titanium species present in the solution were responsible for the catalytic activity observed.

  • The catalysis of the Ruff oxidative degradation of Aldonic Acids by titanium‐containing zeolites
    Catalysis Letters, 2000
    Co-Authors: Gwenaelle Hourdin, Alain Germain, Claude Moreau, Francois Fajula

    Abstract:

    Ti‐BEA and Ti‐FAU, obtained by post‐synthesis treatment, and TS‐1, obtained by direct hydrothermal synthesis, have been tested as catalysts for the Ruff oxidative degradation of calcium d‐gluconate to d‐arabinose using diluted hydrogen peroxide as oxidant. Only large‐pore zeolites Ti‐BEA and Ti‐FAU were found to be active. It was shown, in particular, that a very rapid leaching of titanium occurred and that the titanium species present in the solution were responsible for the catalytic activity observed.

Gwenaelle Hourdin – 2nd expert on this subject based on the ideXlab platform

  • the catalysis of the ruff oxidative degradation of Aldonic Acids by copper ii containing solids
    Journal of Catalysis, 2002
    Co-Authors: Gwenaelle Hourdin, Alain Germain, Claude Moreau, Francois Fajula

    Abstract:

    The catalysis of the Ruff oxidative degradation of calcium D-gluconate to D-arabinose by aqueous diluted hydrogen peroxide was investigated using copper(II)-containing solids: zeolites and resins. Among zeolites, copper(II)-exchanged Y faujasite has given good results, similar to homogeneous copper catalysts. Only minute amounts of soluble copper were detected at the end of the reaction and the recovered solid was recycled twice without diminution of efficiency. However, it was not true heterogeneous catalysis because the chelating gluconate anion leached copper right from the beginning of the reaction. So, the catalysis occurred in solution but the metal precipitated again at the end of the reaction, when all the gluconate was consumed. Copper (II) iminodiacetic resin, in which the metal cation is more strongly bound than in the gluconate complex, was not active. This demonstrates that copper(II) must be in solution in order to be active.

  • the catalysis of the ruff oxidative degradation of Aldonic Acids by titanium containing zeolites
    Catalysis Letters, 2000
    Co-Authors: Gwenaelle Hourdin, Alain Germain, Claude Moreau, Francois Fajula

    Abstract:

    Ti‐BEA and Ti‐FAU, obtained by post‐synthesis treatment, and TS‐1, obtained by direct hydrothermal synthesis, have been tested as catalysts for the Ruff oxidative degradation of calcium d‐gluconate to d‐arabinose using diluted hydrogen peroxide as oxidant. Only large‐pore zeolites Ti‐BEA and Ti‐FAU were found to be active. It was shown, in particular, that a very rapid leaching of titanium occurred and that the titanium species present in the solution were responsible for the catalytic activity observed.

  • The catalysis of the Ruff oxidative degradation of Aldonic Acids by titanium‐containing zeolites
    Catalysis Letters, 2000
    Co-Authors: Gwenaelle Hourdin, Alain Germain, Claude Moreau, Francois Fajula

    Abstract:

    Ti‐BEA and Ti‐FAU, obtained by post‐synthesis treatment, and TS‐1, obtained by direct hydrothermal synthesis, have been tested as catalysts for the Ruff oxidative degradation of calcium d‐gluconate to d‐arabinose using diluted hydrogen peroxide as oxidant. Only large‐pore zeolites Ti‐BEA and Ti‐FAU were found to be active. It was shown, in particular, that a very rapid leaching of titanium occurred and that the titanium species present in the solution were responsible for the catalytic activity observed.

Fuping Lu – 3rd expert on this subject based on the ideXlab platform

  • efficient production of sugar derived Aldonic Acids by pseudomonas fragi tccc11892
    RSC Advances, 2018
    Co-Authors: Juanjuan Yang, Jianlin Wu, Fuping Lu

    Abstract:

    Aldonic Acids are receiving increased interest due to their applications in nanotechnology, food, pharmaceutical and chemical industries. Microbes with aldose-oxidizing activity, rather than purified enzymes, are used for commercial production with limited success. Thus it is still very important to develop new processes using strains with more efficient and novel biocatalytic activities for the production of adonic Acids. In the present study, Pseudomonas fragi TCCC11892 was found to be an efficient producer of Aldonic Acids, with the production of galactonic and L-rhamnonic acid by P. fragi reported for the first time. The semi-continuous production of maltobionic acid and lactobionic acid was developed for P. fragi TCCC11892, achieving a yield of over 90 g L−1 for the first 7 cycles. The excellent performance of P. fragi in the production of lactobionic acid (119 g L−1) was also observed when using waste cheese whey as an inexpensive fermentation medium. Scaling up of the above process for production of Aldonic Acids with P. fragi TCCC11892 cells should facilitate their commercial applications.