Effect of polar solvents on beta-carotene radical precursor
Tian, Yu-Xi1,2; Han, Rui-Min1,2; Zhang, Jian-Ping1,2; Skibsted, Leif H.3
Abstractbeta-Carotene forms radicals in chloroform upon photo-excitation (i) in the femtosecond time-scale by direct electron ejection into chloroform and (ii) in the microsecond time-scale by secondary reactions with chloroform radicals formed in the faster reactions. The precursor for beta-carotene radical cation decays in a second-order reaction in the mixed solvents, with a rate decreasing for increasing dielectric constant of cosolvent (acetic acid < ethanol < acetonitrile similar to methanol). The precursor is assigned as an ion pair from which the beta-carotene radical cation is formed in neat chloroform, but in more polar solvents it reacts at least partly through disproportionation in a bimolecular reaction promoted by the presence of ions. The stabilization of the radical precursor by increased solvent polarity, allowing for deactivation of the precursor by an alternative reaction channel, is discussed in relation to the balance of pro- and antioxidative properties of beta-carotene at lipid/water interfaces.
KeywordBeta-carotene Radical Solvent Effect Antioxidant
Indexed BySCI
WOS IDWOS:000255002200011
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Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorHan, Rui-Min
Affiliation1.Renmin Univ China, Dept Chem, Beijing 100872, Peoples R China
2.Chinese Acad Sci, Inst Chem, State Key Lab Struct Chem Unstable & Stable Speci, BNLMS, Beijing 100080, Peoples R China
3.Univ Copenhagen, Fac Life Sci, Dept Food Sci, DK-1058 Frederiksberg, Denmark
Recommended Citation
GB/T 7714
Tian, Yu-Xi,Han, Rui-Min,Zhang, Jian-Ping,et al. Effect of polar solvents on beta-carotene radical precursor[J]. FREE RADICAL RESEARCH,2008,42(3):281-286.
APA Tian, Yu-Xi,Han, Rui-Min,Zhang, Jian-Ping,&Skibsted, Leif H..(2008).Effect of polar solvents on beta-carotene radical precursor.FREE RADICAL RESEARCH,42(3),281-286.
MLA Tian, Yu-Xi,et al."Effect of polar solvents on beta-carotene radical precursor".FREE RADICAL RESEARCH 42.3(2008):281-286.
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