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将产于加勒比海西部新鲜的热带海藻棕叶藻[Stypopodium zonale(Lamouroux)Papenfuss]放在水中,水立即变成铁锈色,这种有色的水对生活在礁岩边的一种吃草小鱼Eupomacenturs leucostictus毒性很大。用乙醚提取此铁锈色水得到的主要成份是一种亮红色邻-醌类化合物棕叶藻二酮(Stypoldione,1)。海水中含1.0微克/毫升的(1)即表现出与原海藻相同的毒性。但海藻的氯仿/甲醇粗提取物的毒性比(I)更
Place the fresh tropical algae, Stypopodium zonale (Lamouroux) Papenfuss, in the western Caribbean, into water immediately turning the water rusty. This colored water reacts on grazing fish Eupomacenturs leucostictus is very toxic. The main ingredient extracted with this rusty water from ether is a bright red o-quinone compound, Stypoldione (1). The seawater containing 1.0 micrograms per milliliter (1) showed the same toxicity as the original seaweed. However, the chloroform / methanol crude extract of seaweed is more toxic than (I)