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1 Polish Journal of Chemistry

1 1999

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The inclusion complex of vitamin K3 bisulfite with B-cyclodextrin studied by means of OSWV and UV-visible spectroscopy

Gong X., Li H.

Polish Journal of Chemistry

1999

vol. 73 nr 3

501-508

The reduction of Vitamin K3 bisulfite (VK3B) in the presence of b-cyclodextrin (b-CD) has been investigated by Osteryoung square wave voltammetry (OSWV) in phosphate buffer (pH=6.6). The results showed that b-CD form a 1:1 inclusion complex with VK3B. The dissociation constant was calculated from the plot of I2pc vs. (I2pc(VK3B)- I2pc)/[b-CD] to be Kd=3,5x10-3M. The diffusion coefficients of VK3B and the inclusion complex were obtained by chronocoulometry (CC) to be Df=1.5x10-6 cm2/s and Dc=0.7x10-6 cm2/s, respectively. UV-visible spectra gave further evidence of the complex formation and the dissociation constant obtained by spectroscopy, Kdi=5.0x10-3M, is in good agreement with that determined by electrochemistry.