Abstract
The carotenoids in the carapace, flesh and gonad of Paralithodes brevipes were investigated from the stereochemical point of view. The absolute configuration of papilioerythrinone (=3-hydroxy-β, e-carotene-4, 3'-dione) isolated from the crab was determined to be (3S, 6'R)-configuration. In the carapace and flesh, three stereoisomers of astaxanthin (33-39%) and (3S, 3'S)-7, 8-didehydro-astaxanthin (27-32%) were identified as major components accompanied by (3S, 3'S)-7, 8, 7', 8'-tetradehydro-astaxanthin (6-7%), fritschiellaxanthin (4-10%) and papilioerythrinone (2-6%) etc., while in the gonad β, β-carotene (64%) was found to be dominant along with three stereo-isomers of astaxanthin (11%), echinenone (7%) and isocryptoxanthin (3%) etc. From the experimental results obtained, we proposed the plausible oxidative metabolic path-way of lutein A to papilioerythrinone via fritschiellaxanthin in P. brevipes.
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