title: [Quenching of chlorophyll and pheophytin fluorescence with fucoxanthin].
abstract: Quenching of chlorophyll a and pheophytin a fluorescence with fucoxanthin in acetone and n-hexanole at room temperature was investigated. The relationship between fluorescence yield and concentration of the quencher is subject to Stern--Folmer relation. The velocity constants were calculated and the efficiency of fluorescence quenching was determined. The energetic estimation has shown that the fluorescence quenching mechanism when the excited chlorophyll a molecule collides with fucoxanthin molecule may involve electron transfer from chlorophyll to fucoxanthin. In case of pheophytin a transfer of the electron from fucoxanthin to pheophytin is likely to take place.
mesh_terms: D002338:Carotenoids / Q000031:analogs & derivatives*; D055598:Chemical Phenomena; D002621:Chemistry; D002734:Chlorophyll / Q000031:analogs & derivatives; D007700:Kinetics; D008433:Mathematics; D010674:Pheophytins; D013050:Spectrometry, Fluorescence; D024341:Xanthophylls
chemical_list: D010674:Pheophytins; D024341:Xanthophylls; C025164:fucoxanthin; D002734:Chlorophyll; D002338:Carotenoids
vernacular_title: Tushenie fluorestsentsii khlorofilla i feofitina fukoksantinom.