Abstract
Abstract— Carotenoid pigments were extracted and purified from wild‐type and mutants 7 and 93a of Sarcina lutea, and tested for their ability to quench 1O2. The wild‐type pigment (P‐438, 9 conjugated double bonds) is as active in quenching 1O2 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 1O2. 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.
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