Carotinoide aus marinen Schwämmen (Porifera): Isolierung und Struktur von sieben Hauptcarotinoiden ausAgelas schmidtii

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Abstract
Carotenoids from Marine Sponges(Porifera): Isolation and Structure of the Seven Main Carotenoids fromAgelas schmidtiiThe following carotenoids were identified in the marine spongeAgelas schmidtii: α‐carotene ((6′R)‐β, ε‐carotene (1)), isorenieratene (φ,φ‐carotene (2)), trikentriorhodin (3,8‐dihydroxy‐κ,χ‐caroten‐6‐one (3)) and zeaxanthin ((3R, 3′R)‐β, β‐carotene‐3, 3′‐diol (4)). In addition, three previously unknown carotenoids called agelaxanthin A, B and C were isolated. Spectroscopical and chemical structure elucidation showed agelaxanthin A to be (3R)‐β, φ‐caroten‐3‐ol (6) and agelaxanthin C to be a methoxy‐19,3′,8′‐trihydroxy‐7,8‐didehydro‐β, κ‐caroten‐6′‐one (7) with the methoxy group at C (2), C (3) or C (4). The limited data on age‐laxanthin B were compatible with the structure of a 19‐O‐methyl derivative of agelaxanthin C.