These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Biocatalytic oxidation of bisphenol A in a reverse micelle system using horseradish peroxidase.
    Author: Hong-Mei L, Nicell JA.
    Journal: Bioresour Technol; 2008 Jul; 99(10):4428-37. PubMed ID: 17928223.
    Abstract:
    Horseradish peroxidase (HRP) was used to catalyze the oxidation of bisphenol A (BPA) in a reverse micelle system consisting of water, sodium bis(2-ethylhexyl)sulfosuccinate (AOT) as the surfactant, and n-octane as the organic solvent phase. In order to achieve maximal BPA transformation, a water-to-surfactant molar ratio greater than 15 was required, above which no further increase in conversion was observed. BPA transformation was catalyzed in the reverse micelle system over a pH range of 6-9 with an optimum at pH 7 and was enhanced with increasing temperatures up to 40 degrees C. The stoichiometric ratio of moles of bisphenol A transformed per mole of peroxide consumed was 0.46 when the initial BPA concentration was 0.01 mM, which is significantly less than the theoretical value of 2 based on the known catalytic cycle of the enzyme. However, the stoichiometric ratio increased and approach the theoretical value with higher BPA concentrations. Over the course of the catalytic reaction, the enzyme became inactivated. Hydrogen peroxide strongly inhibited the enzyme and, thus, when the oxidant was present in quantities in excess of the stoichiometric amount, BPA transformation was significantly reduced.
    [Abstract] [Full Text] [Related] [New Search]