Oxidative cross-linking of wheat arabinoxylans by manganese peroxidase. Comparison with laccase and horseradish peroxidase. Effect of cysteine and tyrosine on gelation
1999
Figueroa-Espinoza, M.C. | Morel, M.H. | Surget, A. | Rouau, X.
The potential of manganese peroxidase (MnP) from Phanerochaete chrysosporium to cross-link wheat arabinoxylans, and to covalently link cysteine and tyrosine to the ferulic acid esterified on arabinoxylans, was investigated. MnP was able to gel arabinoxylans by oxidative coupling of their feruloyl groups, with concominant formation of dehydrodimers of ferulic acid. Whereas at high concentrations cysteine delayed gelation, at low concentrations it had no effect. Tyrosine did not affect gelation, but it accelerated the consumption of ferulic acid. The MnP was compared to laccase from Pycnoporus cinnabarinus and the couple hydrogen peroxide/horseradish peroxidase (H2O2/POD).
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