Back
Hydroxyl radical oxidation of feruloylated arabinoxylan.
Journal article

Hydroxyl radical oxidation of feruloylated arabinoxylan.

  • Bagdi A Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 9, CH-8092 Zurich, Switzerland; Department of Applied Biochemistry and Food Science, Budapest University of Technology and Economics (BME), Műegyetem rkp. 3, H-1111 Budapest, Hungary. Electronic address: bagdiattila@mail.bme.hu.
  • Tömösközi S Department of Applied Biochemistry and Food Science, Budapest University of Technology and Economics (BME), Műegyetem rkp. 3, H-1111 Budapest, Hungary. Electronic address: tomoskozi@mail.bme.hu.
  • Nyström L Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 9, CH-8092 Zurich, Switzerland. Electronic address: laura.nystroem@hest.ethz.ch.
  • 2016-08-13
Published in:
  • Carbohydrate polymers. - 2016
Arabinoxylan
EPR
Gelation
Hydroxyl radical
Oxidation
Viscosity
Coumaric Acids
Electron Spin Resonance Spectroscopy
Hydroxyl Radical
Oxidants
Oxidation-Reduction
Temperature
Xylans
English Feruloylated arabinoxylan (AX) has a unique capacity to form covalent gels in the presence of certain oxidizing agents. The present study demonstrates that hydroxyl radical oxidation does not provoke ferulic acid dimerization and thus oxidative gelation. We studied the hydroxyl radical mediated oxidation of an alkali-extracted AX preparation (purity: 92g/100g dry matter) that showed gel-forming capability upon peroxidase/hydrogen peroxide treatment. Hydroxyl radicals were produced with ascorbate-driven Fenton reaction and the radical formation was monitored with electron paramagnetic resonance, using a POBN/EtOH spin trapping system. Oxidation was carried out at different catalytic concentrations of iron (50 and 100μM) and at different temperatures (20°C, 50°C, and 80°C). It was demonstrated that hydroxyl radical oxidation does not provoke gel formation, but viscosity decrease in AX solution, which suggests polymer degradation. Furthermore, it was demonstrated that hydroxyl radical formation in AX solution can be initiated merely by increasing temperature.
Language
  • English
Open access status
closed
Identifiers
Persistent URL
https://sonar.ch/global/documents/40836
Statistics
Document views: 36 File downloads: