Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Shunichi Fukuzumi | * |
dc.date.accessioned | 2020-12-03T16:30:21Z | - |
dc.date.available | 2020-12-03T16:30:21Z | - |
dc.date.issued | 2020 | * |
dc.identifier.issn | 1011-1344 | * |
dc.identifier.other | OAK-28208 | * |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/255582 | - |
dc.description.abstract | Laser excitation of a single precursor, namely 2-hydroxy-4′-(2-hydroxyethoxy)-2-methylpropiophenone (HHEMP), has been used for generating the radical cations and radical anions of various carotenoids in methanol. In the presence of oxygen, laser excitation of HHEMP undergoes an efficient α-cleavage reaction (Norrish type I) to form acyl radicals, which react with O2, in a nearly diffusion-controlled reaction, to form their corresponding strong oxidizing acylperoxyl radicals (RO2•) (E = ~1.1 V (v SHE)), which are capable of oxidizing almost all carotenoids. Under argon-saturated conditions and in the presence of strong base (0.01 M NaOH or tetrabutylammonium hydroxide (TBAOH)), the initially formed 2-hydroxy-2-propyl radical (ACH•), generated after LFP of HHEMP, is deprotonated to form the strong reducing acetone ketyl radical (AC•-) (E {acetone/ AC•-} = −2.1 V (v SHE)), which is capable of reducing all carbonyl-containing carotenoids. To validate this new proposed approach, retinal and β-apo-8′-carotenal (APO), with known spectroscopic data, were investigated in methanol, acetonitrile and tetrahydrofuran (THF). In addition, the radical ions of newly investigated carotenoids, namely 4-oxo-β-apo-15′-carotenoic acid (4-oxo-15′), crocetindial, 4-oxo-β-apo-10′-carotenoic acid ethyl ester (4-oxo-10′) and 4-oxo-β-apo-8′-carotenoic acid ethyl ester (4-oxo-8′) have been reported. Moreover, the scope of this approach has been extended to investigate the radical ions of chlorophyll b. © 2020 Elsevier B.V. | * |
dc.language | English | * |
dc.publisher | Elsevier B.V. | * |
dc.subject | Carotenoid | * |
dc.subject | Chlorophyll b | * |
dc.subject | Flash photolysis | * |
dc.subject | Ketyl radical | * |
dc.subject | Radical anion | * |
dc.subject | Radical cation | * |
dc.title | Carotenoid radical ions: A laser flash photolysis study | * |
dc.type | Article | * |
dc.relation.volume | 212 | * |
dc.relation.index | SCIE | * |
dc.relation.index | SCOPUS | * |
dc.relation.journaltitle | Journal of Photochemistry and Photobiology B: Biology | * |
dc.identifier.doi | 10.1016/j.jphotobiol.2020.112023 | * |
dc.identifier.wosid | WOS:000582482300009 | * |
dc.identifier.scopusid | 2-s2.0-85091748787 | * |
dc.author.google | El-Agamey A. | * |
dc.author.google | Melø T.B. | * |
dc.author.google | El-Hagrasy M.A. | * |
dc.author.google | Partali V. | * |
dc.author.google | Fukuzumi S. | * |
dc.contributor.scopusid | Shunichi Fukuzumi(35430038100;58409757400) | * |
dc.date.modifydate | 20240401081001 | * |