Excitation energy transfer in carotenoid-chlorophyll protein complexes probed by femtosecond fluorescence decays

✍ Scribed by Seiji Akimoto; Sinichi Takaichi; Takehiko Ogata; Yoshinobu Nishimura; Iwao Yamazaki; Mamoru Mimuro

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 448 KB
• Volume: 260
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(96)00863-9

✦ Synopsis

An energy transfer pathway in a carotenoid-chlorophyll a protein complex of dinoflagellates was studied by the femtosecond up-conversion method. The energy levels of the S 2 state of peridinin and their lifetime were essentially identical in methanol and in the complex. The S l lifetime of peridinin in solvents was more than 30-fold longer than in the complex. These results account for an observed transfer efficiency (higher than 85%) and indicate that an energy transfer occurs between the S j states of peridinin and chlorophyll a after a rapid internal conversion. This pathway is unique in photosynthetic organisms.