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ADMR of carotenoid triplet states in bacterial photosynthetic antenna and reaction center complexes

✍ Scribed by V. Aust; A. Angerhofer; J. Ullrich; J.U. von Schütz; H.C. Wolf; R.J. Cogdell

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
728 KB
Volume
181
Category
Article
ISSN
0009-2614

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✦ Synopsis

Using absorption detected magnetic resonance (ADMR) the triplet states of carotenoids have been detected in B880-RC complexes of the purple photosynthetic bacteria Rhodocyclus gelatinosus 149, Rhodopseudomonas acidophrla 7050, Rhodopsrudomonas paluslris 8252, and Rhodospirillum rubrum SI, and in reaction center (RC) complexes of Rhodosplrillum rubrum SI.

The triplet states were identified as belongmg to antenna carotenoids in the all-tram conformatIon with conjugated chain lengths ranging from 10 to 13 double bonds, and to ihe RC carotenoid 15,15 '-cis splrilloxanthin. Carotenoids with different numbers of conjugated double bonds have similar abihty to quench the trlplet states of the bacteriochlorophylls.

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