Gemini1231双季铵盐选择性抑制赤潮生物生长的实验

以甲藻门的东海原甲藻、塔玛亚历山大藻、裸甲藻,黄藻门的赤潮异弯藻,硅藻门的中肋骨条藻等典型赤潮生物以及绿藻门的青岛大扁藻和亚心形扁藻2种非赤潮生物为研究对象,探讨了Gemini1231双季铵盐类表面活性剂的抑藻活性.结果表明,该表面活性剂在较低浓度下(0.2～0.5 mg·L^-1时),对东海原甲藻、塔玛亚历山大藻和赤潮异湾藻等赤潮生物的生长表现出了明显的抑制作用.当该双季铵盐的浓度增至0.5 mg·L^-1以上时,对中肋骨条藻的生长也表现出了一定的抑制作用.而在相同浓度范围内,对裸甲藻和所选用的2种非赤潮生物生长的影响不明显,表现出了抑藻作用的选择性.对各海洋微藻的脂肪酸组成分析表明,该表面活性剂的选择性抑藻作用与不同海洋微藻生物膜的脂肪酸组成,尤其是其多不饱和脂肪酸的含量明显相关.

Selective Algicidal Activity of Gemini1231 Biquaternary Ammonium Salt

The growth-inhibiting effects of Gemini1231 surfactant on Prorocentrum donghaiense,Alexandrium tamarense,Gymnodinium sp.,Heterosigma akashiwo,Skeletonema costatum,Platymonas helgolanidica and Platymonas subcordiforus were investigated.The results demonstrate that the growth of P.donghaiense,A.tamarense and H.akashiwo was strongly inhibited in medium containing Gemini1231 from 0.2 to 0.5(mg·L^-1,) and the S.costatum was also inhibited at concentrations above 0.5(mg·L^-1.) However,the effects of this surfactant on the growth of Gymnodinium sp.and two beneficial green microalgae tested were negligible under the same treatment,indicating the potential for the selective control of red tide organisms.In addition,the analysis of the correlation between the inhibitory effect of the Gemini1231 on the algae tested and fatty acid composition of the algae implied that the differences in the fatty acid composition,especially the proportion of PUFAs,were responsible for the species-specific responses to biquaternary ammonium salt.