Interdepartmental Research Centre for Environmental Sciences (CIRSA), University of Bologna, Ravenna, Italy.
Chem Res Toxicol. 2011 Mar 21;24(3):392-401. doi: 10.1021/tx100343p. Epub 2011 Feb 25.
This article describes the toxic effects of imidazolium ionic liquids bearing alkyl (BMIM), monoethoxy (MOEMIM), and diethoxy (M(OE)(2)MIM) side chains toward two marine diatoms, Skeletonema marinoi and Phaeodactylum tricornutum. MOEMIM and M(OE)(2)MIM cations showed a lower inhibition of growth and photosynthetic efficiency with respect to their alkyl counterpart, with both algal species. However, a large difference in sensitivity was found between S. marinoi and P. tricornutum, the first being much more sensitive to the action of ionic liquids than the second one. The effects of salinity on BMIM Cl toxicity toward S. marinoi revealed that a decrease from salinity 35 to salinity 15 does not influence the biological effects toward the alga. Finally, Fourier transform infrared (FT-IR) microscopy of algal cells after ionic liquids exposure allowed us to detect an alteration of the organic cellular components related to silica uptake and organization. On the basis of these results, the different behavior of the two diatom species can be tentatively ascribed to different silica uptake and organization in outer cell walls.
本文描述了带有烷基（BMIM）、单乙氧基（MOEMIM）和二乙氧基（M(OE)(2)MIM）侧链的咪唑鎓离子液体对两种海洋硅藻——Skeletonema marinoi 和 Phaeodactylum tricornutum 的毒性作用。MOEMIM 和 M(OE)(2)MIM 阳离子相对于其烷基对应物对两种藻类的生长和光合作用效率的抑制作用较低。然而，S. marinoi 和 P. tricornutum 之间的敏感性差异很大，前者比后者对离子液体的作用更为敏感。盐度对 S. marinoi 中 BMIM Cl 毒性的影响表明，从盐度 35 降低到盐度 15 不会影响藻类的生物效应。最后，离子液体暴露后藻类细胞的傅里叶变换红外（FT-IR）显微镜分析允许我们检测与硅吸收和组织有关的有机细胞成分的改变。基于这些结果，两种硅藻物种的不同行为可以暂时归因于它们在细胞壁外对硅的吸收和组织方式不同。
