CJCU

Chem. J. Chinese Universities ›› 2006, Vol. 27 ›› Issue (3): 556.

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Reaction of Carotenoids with Nitrogen Dioxide Radical(NO·2)

ZHAO Wen-En1*,HUANG Jin-Yong2,WANG Wen-Feng3,QIAN Su-Ping3,YAO Si-De3   

  1. 1. Chemical Engineering College;2. Department of Bioengineering,Zhengzhou University,Zhengzhou 450052;
    3. Shanghai Institute of Applied Physics,Shanghai 201800,China
  • Received:2005-03-14 Online:2006-03-10 Published:2006-03-10

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Abstract:

The interactions of carotenoids with NO·2 were investigated by pulse radiolysis. Optical traces show bleaching of the ground-state absorption of β-carotene,zeaxanthin and canthaxanthin at 450 nm,and bixin at 460—510 nm. The transient absorption spectrum shows that the positive absorption attributed to the formation of carotenoid addition radicals cannot be observed in the range of 600—700 nm. It is suggested that carotenoids undergo more readily electron transfer with NO·2 to yield the carotenoid radical cations. The rate constants for the reaction of β-carotene,zeaxanthin,bixin and canthaxanthin with NO·2 obtained are 1.6×108,2.41×108,5.41×107 and 1.75×107 mol/(L-1·s-1),respectively.

Key words: Carotenoid; NO·2; Pulse radiolysis; Transient absorption

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