ICCAS OpenIR
Radical cation generation from singlet and triplet excited states of all-trans-lycopene in chloroform
Han, RM; Wu, YS; Feng, J; Ai, XC; Zhang, JP; Skibsted, LH
2004-09-01
Source PublicationPHOTOCHEMISTRY AND PHOTOBIOLOGY
ISSN0031-8655
Volume80Issue:2Pages:326-333
AbstractOn direct photoexcitation, subpicosecond time-resolved absorption spectroscopy revealed that the 1B(u)-type singlet excited state of all-trans-lycopene in chloroform was about seven times more efficient than all-trans-beta-carotene in generating the radical cation. The time constant of radical cation generation from the 1B(u)-type state was found to be similar to0.14 ps, a value that was comparable for the two carotenoids. On anthracene-sensitized triplet excitation, radical cation generation was found to be much less efficient for lycopene than for beta-carotene. A slow rising phase (20-30 mus) in the bleaching of ground-state absorption was common for both lycopene and beta-carotene in chloroform and was ascribed to an efficient secondary reaction with a solvent radical leading to the formation of carotenoid radical cations. The reverse ordering in the tendency of the excited states of different multiplicities for the two carotenoids to generate radical cations is discussed in relation to the two carotenoids as scavengers of free radicals.
Indexed BySCI
Language英语
WOS IDWOS:000225158400027
PublisherAMER SOC PHOTOBIOLOGY
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Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/81652
Collection中国科学院化学研究所
Corresponding AuthorZhang, JP
Affiliation1.Chinese Acad Sci, State Key Lab Struct Chem Unstable & Stable Speci, Inst Chem, Beijing 100080, Peoples R China
2.Royal Vet & Agr Univ, Dept Dairy & Food Sci, Frederiksberg C, Denmark
Recommended Citation
GB/T 7714
Han, RM,Wu, YS,Feng, J,et al. Radical cation generation from singlet and triplet excited states of all-trans-lycopene in chloroform[J]. PHOTOCHEMISTRY AND PHOTOBIOLOGY,2004,80(2):326-333.
APA Han, RM,Wu, YS,Feng, J,Ai, XC,Zhang, JP,&Skibsted, LH.(2004).Radical cation generation from singlet and triplet excited states of all-trans-lycopene in chloroform.PHOTOCHEMISTRY AND PHOTOBIOLOGY,80(2),326-333.
MLA Han, RM,et al."Radical cation generation from singlet and triplet excited states of all-trans-lycopene in chloroform".PHOTOCHEMISTRY AND PHOTOBIOLOGY 80.2(2004):326-333.
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