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Effects of metal ions on the activity and stability of peroxidase in Tartary buckwheat shoots

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DOI: 10.4236/jacen.2013.23009    3,233 Downloads   5,726 Views   Citations

ABSTRACT

This is the first report to purify and characterize POX in shoots of buckwheat species. POX was partially purified from Tartary buckwheat shoots by 48.0 fold with a final yield of 9.07%. During ion-exchange and gel filtration chromatography,only one peak corresponding to POX activity was found. The molecular weight of POX was determined to be 37.5 kDa using gel filtration chromatography. The optimal pH of POX activity was 5.5 (guaiacol, quercetin) and 5.0 (ABTS). The Km of POX activity was 22.3 mM (guaiacol), 6.3 mM (ABTS) and 0.92 mM (quercetin). In contrast, the Km for quercetin in the presence of Fe3+ions was two orders of magnitude less (0.018 mM) than that in its absence. The stability of POX activity was increased in the presence of trivalentmetal ions, even after 186 h in solution. POX activity
was retained by 83.6% and 56.1% in the presence of 1 mMFe3+and Al3+ions, respectively, whereasit was completely inactivated in
their absence. To the best of our knowledge, this is thefirst study to detail the activation and stabilization of POX activity in relation to trivalent metal ions.


Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

D. Mikami, H. Kurihara, K. Takahashi, T. Suzuki and T. Morishita, "Effects of metal ions on the activity and stability of peroxidase in Tartary buckwheat shoots," Journal of Agricultural Chemistry and Environment, Vol. 2 No. 3, 2013, pp. 59-64. doi: 10.4236/jacen.2013.23009.

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