A Novel Carotenoid Ester, Loroxanthin Dodecenoate, fromPyramimonas parkeae(Prasinophyceae) and a Chlorarachniophycean Alga

摘要

A novel carotenoid ester, which had previously been assumed tentatively and without full supporting data to be loroxanthin 19-dodecenoate (Kohata and Watanabe 1989), was isolated and purified from cultured strains ofPyramimonas parkeae(Prasinophyceae) and a chlorarachniophycean alga. From spectroscopic and chemical evidence, including results of analysis by1H-NMR, FD-MS, GLC and CD, the compound was clearly identified as loroxanthin dodecenoate, (3R,3′R,6′R)-β,ε-carotene-3,19,3′-triol 19-(2-trans-dodecenoate). A double bond of the dodecenoate was located at theΔ12 position and was in thetransform, as is the case for that in a siphonaxanthin ester. However, loroxanthin itself was absent from these algae. Other algal pigments identified were Chls a and b,β-carotene, lutein A, zeaxanthin, violaxanthin and n