Acta Phys. -Chim. Sin. ›› 1999, Vol. 15 ›› Issue (11): 1030-1035.doi: 10.3866/PKU.WHXB19991114

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Determination of One-Electron Reduction Potential of Vitamin K1 in Mixed Solvent

Chen Jia-Fu, Chu Gao-Sheng, Ge Xue-Wu, Zhang Zhi-Cheng, Yao Si-De   

  1. Department of Applied Chemistry,University of Science and Technology of China,Hefei 230026|Labaratory of Radiation Chemistry,shanghai Institute of Nuclear Research,Chinese Academy of Science,Shanghai 201800
  • Received:1999-01-28 Revised:1999-03-22 Published:1999-11-15
  • Contact: Chen Jia-Fu

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Abstract:

The reaction process of VK1 and isopropanol radical has been investigated by using pulse radiolytical technique. It has been found that the reduction states of VK1 exist in two forms under different pH conditions, that are VK1H•(pH < 5.4) and VK1-• (pH > 5.4), their maximum absorption peaks are 370 nm and 390 nm respectively. Selecting MV2+as the refereance, the one electron reduction potential of VK1 in N2 saturated aqueous isopropanol acetone mixed solvent and in N2O saturated water-isopropanol has been determined as -266 and -279mV respectively.

Key words: Vitamin K1, One-electron reduction potential, Pulse radiolysis