Citation: TANG Rui-Zhi, LI Hai-Xia, LIU Yan-Cheng, ZHANG Peng, CAO Xi-Yan, WANG Wen-Feng. Laser Flash Photolysis Study on Electron Transfer Oxidation Reaction of Tryptophan or Tyrosine with Triplet State Vitamin K3[J]. Acta Physico-Chimica Sinica, ;2012, 28(01): 213-216. doi: 10.3866/PKU.WHXB201228213
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Laser flash photolysis was used to study the photosensitized oxidation mechanism of vitamin K3, commonly known as 2-methyl-1,4-naphthoquinone (MQ), with tryptophan (TrpH) or tyrosine (TyrOH) in acetonitrile/water (1:1, V/V) solution. The triplet state of MQ reacted with TrpH or TyrOH by electron transfer with the formation of a MQ anion radical, which was directly observed in the transient absorption spectrum. The rate constants of the electron transfer reactions were determined to be 1.1×109 and 0.6×109 L·mol-1·s-1 for TrpH and TyrOH, respectively. The free energy changes (ΔG) of the reactions showed that the proposed electron transfer steps are thermodynamically feasible.
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Keywords:
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Vitamin K3
, - Tryptophan,
- Tyrosine,
- Laser flash photolysis
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