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CAROTENOID CHROMOPHORE LENGTH AND PROTECTION AGAINST PHOTOSENSITIZATION
Author(s) -
MathewsRoth Micheline M.,
Wilson Thérèse,
Fujimori Eiji,
Krinsky Norman I.
Publication year - 1974
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1974.tb06501.x
Subject(s) - phytoene , chemistry , photochemistry , chromophore , carotenoid , chlorophyll , quenching (fluorescence) , pigment , conjugated system , sarcina , hydroquinone , fluorescence , biochemistry , biology , organic chemistry , polymer , lycopene , physics , quantum mechanics , genetics , bacteria
— Carotenoid pigments were extracted and purified from wild‐type and mutants 7 and 93a of Sarcina lutea , and tested for their ability to quench 1 O 2 . The wild‐type pigment (P‐438, 9 conjugated double bonds) is as active in quenching 1 O 2 as is β‐carotene. On the other hand, the pigment P‐422 (8 conjugated double bonds) from mutant 7 is 2 or 3 times less efficient, whereas phytofluene and phytoene from S. lutea are 100 and 1000 times less efficient, respectively, than is β‐carotene at quenching 1 O 2 . It was also found that the broad EPR signal, induced by light in benzene solutions of chlorophyll a and hydroquinone, and related to chlorophyll oxidation, is efficiently quenched by P‐438 and to a much smaller extent also by Sarcina phytoene.