PMID: 8951424Dec 1, 1996Paper

Kinetics of parallel electron transfer from beta-carotene to phenoxyl radical and adduct formation between phenoxyl radical and beta-carotene

Free Radical Research
A Mortensen, Leif H Skibsted

Abstract

Phenoxyl radicals generated by laser flash photolysis were found to react with beta-carotene with concomitant beta-carotene bleaching in two parallel reactions with similar rates: (i) formation of a beta-carotene adduct with a (pseudo) first order rate constant of 1-1.5 x 10(4) s-1 with absorption maximum around 800 nm, and (ii) formation of a beta-carotene radical cation with a (pseudo) first order rate constant of 2-3 x 10(4) s-1 with absorption maximum around 920 nm. Both beta-carotene radicals decay on a similar time scale and have virtually disappeared after 100 ms, the beta-carotene adduct by a second order process. Oxygen had no effect on beta-carotene bleaching or radical formation and decay. The reduction of phenoxyl radicals by beta-carotene may prove important for an understanding of how beta-carotene acts as an antioxidant.

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Citations

May 22, 2001·Archives of Biochemistry and Biophysics·A MortensenT G Truscott
Jul 20, 2007·Photosynthesis Research·Mary Grace I GalinatoHarry A Frank
Mar 21, 2003·Archives of Biochemistry and Biophysics·Ann CantrellFritz Böhm
May 24, 2003·Biochemical and Biophysical Research Communications·Norman I Krinsky, Kyung-Jin Yeum
Jun 2, 2001·Journal of Photochemistry and Photobiology. B, Biology·M BurkeT G Truscott
Feb 3, 1998·Journal of Photochemistry and Photobiology. B, Biology·R EdgeT G Truscott
Aug 1, 1997·Free Radical Research·A Mortensen, L H Skibsted
Jul 1, 1997·Free Radical Research·L V JørgensenL H Skibsted
Jun 1, 1997·Free Radical Research·A Mortensen, L H Skibsted
Jun 24, 2008·The American Journal of Cardiology·Hyesun McNultyR Preston Mason
Jul 20, 2007·Molecular Nutrition & Food Research·Jens MildeJohanna Grassmann
Oct 31, 2006·Biochimica Et Biophysica Acta·Hyesun P McNultyR Preston Mason
Jun 12, 2010·Annals of the New York Academy of Sciences·Heinz D OsiewaczIngmar Strobel
Jul 10, 2010·Archives of Biochemistry and Biophysics·Alexander V Ruban, Matthew P Johnson
Aug 25, 2004·Archives of Biochemistry and Biophysics·Ali El-AgameyAndrew J Young
Nov 29, 2005·Molecular Aspects of Medicine·Norman I Krinsky, Elizabeth J Johnson
Apr 25, 2012·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Mahesh AgarwalDipak K Das
May 28, 2019·Radiation and Environmental Biophysics·Małgorzata M DobrzyńskaJoanna Radzikowska
Nov 8, 2001·Journal of the American Chemical Society·J Spanget-LarsenJ G Radziszewski
Nov 3, 2006·The Journal of Experimental Biology·Sophie BertrandGabriele Sorci
Feb 18, 2011·The Journal of Physical Chemistry. B·Chang-Hui ChenLeif H Skibsted

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