Investigation on the variation of bioactive metabolites in coral reef organisms

为了开展课题研究，我们在琉球群岛沿着的珊瑚礁中采集了大量的肉珊瑚属的软珊瑚和柱珊瑚属、异柱珊瑚属等海绵的标本。提取每个样本，并使用梯度HPLC和1H NMR检查主要成分。我们专注于西松烷二萜类在软珊瑚的物种，季节和地理区域。结果表明，灰绿青冈中含量最高的是3种主要的化学型，包括emblide、2 R，7S，8 S-sarcophytoxide和7-hydroxy-1，3，11-cembratrien-20，8- carbolactone，此外还有几种罕见的化学型。在S.trocheliophorum的情况下，主要的化学型是2 R，7 R，8 R-sarcophytoxide，而S.ehrenbergi被发现是7，8-环氧-1，3，11-cembratriene。此外，还调查了其他一些种，S.crassocaule，S.elegans，S.infundibuliforme，S. pullchellum，S.cherbonnieri。大多数物种没有观察到季节性变化，但某些物种可能存在地理变异。

In order to carry out the title project, we collected a large number of specimens of soft corals of the genus Sarcophyton and some sponges of the genera such as Stylotella and Dysidea in the coral reefs along the Ryukyu Islands. Each specimen was extracted and checked with gradient HPLC and ^1H NMR for major constituents. We focused on the cembranoid diterepenes in the soft corals with respect to species, seasons, and geographic regions. As a result, the most abundant species S.glaucum was found to be three dominant chemotypes containing emblide, 2R,7S,8S-sarcophytoxide, and 7-hydroxy-1,3,11-cembratrien-20,8- carbolactone together with several rare chemotypes. In case of S.trocheliophorum, the major chemotype was 2R,7R,8R-sarcophytoxide, while S.ehrenbergi was found to be 7,8-epoxy- 1,3,11-cembratriene. Some other species, S.crassocaule, S.elegans, S.infundibuliforme, S.pulchellum, S.cherbonnieri, were also investigated. Seasonal change was not observed for most species, however, geographic variation may exist in some species.