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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 11
BKCSDE 31(11)
November 20, 2010 

Electrochemical and Spectroelectrochemical Behaviors of Vitamin K1/Lipid Modified Electrodes and the Formation of Radical Anion in Aqueous Media
JeeEun Yang, Jang Hee Yoon, Mi Sook Won*, Yoon Bo Shim*,
Vitamin K1, Electron transfer reaction, In situ UV-visible, Anion radical, Lipid
The electrochemical properties of the liposoluble vitamin K1 adsorbed on bare and lipid coated glassy carbon electrodes (GCEs) were studied in unbuffered and well buffered aqueous media. The reduction products of vitamin K1 were characterized by employing cyclic voltammetry and the in situ UV-visible spectroelectrochemical technique. The radical species of vitamin K1 cannot be observed at the bare GCEs in well buffered media. The formation of the anion radical of vitamin K1 was observed in unbuffered solutions above pH 5.9 or at the lipid coated GCE in a well-buffered solution. UV-visible absorption bands of neutral vitamin K1 were observed at 260 nm and 330 nm, and a band corresponding to the anion radical species was observed at 450 nm. The derivative cyclic voltabsorptometric (DCVA) curves obtained for electrochemical reduction of vitamin K1 confirmed the presence of both neutral and anion radical species. The anion radical of vitamin K1 formed at the hydrophobic conditions with phosphatidylcholine (PC) lipid coated electrode was stable enough to be observed in the spectroelectrochemical experiments.
3133 - 3138
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