PMID: 16512435Mar 4, 2006Paper

Electrochemistry of xanthine oxidase and its interaction with nitric oxide

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
Hui ZhouGenxi Li

Abstract

With the help of nanocrystalline TiO2, the direct electrochemistry of xanthine oxidase (XOD) was achieved and two pairs of redox waves were observed. The interaction between XOD and nitric oxide (NO) was also investigated. The experimental results reveal that NO can be reduced at a XOD-nano TiO2 film modified electrode. When the NO concentration was low, the reduced product, HNO, would inactivate the protein. However, when the NO concentration was high, HNO would continue to react with NO to form N2O2- and N3O3-, which would not inhibit XOD, and thus the amount of active protein did not decrease any further.

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