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Effect of Carbon Nanotube-Metal Hybrid Particle Exposure to Freshwater Algae Chlamydomonas reinhardtii.
Scientific Reports ( IF 3.8 ) Pub Date : 2018-Oct-17 , DOI: 10.1038/s41598-018-33674-7 Worawit Intrchom 1 , Megha Thakkar 1 , Raymond F Hamilton 2 , Andrij Holian 2 , Somenath Mitra 1
Scientific Reports ( IF 3.8 ) Pub Date : 2018-Oct-17 , DOI: 10.1038/s41598-018-33674-7 Worawit Intrchom 1 , Megha Thakkar 1 , Raymond F Hamilton 2 , Andrij Holian 2 , Somenath Mitra 1
Affiliation
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We demonstrate for the first time the toxicity of carbon nanotube (CNT) metal hybrids on freshwater algae. Carbon nanotube-silver (CNT-Ag) and platinum hybrids (CNT-Pt) were synthesized and exposed to Chlamydomonas reinhardtii (C. reinhardtii), and their toxicity was compared to the pure metal salts. Interactions between CNT-metal and algae were studied using electron microscopy and it was observed that while outer membrane of the algal cell was damaged as a result of Ag+ toxicity from pure Ag, the CNT-Ag only caused the distortion of the cell wall. It was also observed that the CNT-Ag particles could be internalized and enclosed in internal vesicles in the algal cells. Long-term exposure of the CNT-metals showed delay in algal growth. CNT-Ag at a concentration of 5.0 mg/L showed 90% growth inhibition and also showed a significant effect on photosynthetic yield with a 21% drop compared to the control. It was observed that pure silver was more toxic compared with CNT-Ag for both growth and photosynthesis in the 96-hour exposure. In general, CNT-Pt showed significantly less toxic effects on the algae than CNT-Ag. Based on this study, it is postulated that the CNT suppressed the release of Ag+ from CNT-Ag hybrids, thus reducing overall toxicity.
中文翻译：
碳纳米管-金属杂化颗粒暴露对淡水藻类莱茵衣藻的影响。
我们首次证明了碳纳米管（CNT）金属杂化物对淡水藻类的毒性。合成了碳纳米管-银（CNT-Ag）和铂杂化物（CNT-Pt）并将其暴露于莱茵衣藻（C. Reinhardtii）中，并将它们的毒性与纯金属盐进行了比较。使用电子显微镜研究了CNT-金属和藻类之间的相互作用，观察到虽然藻类细胞的外膜因纯Ag的Ag +毒性而受损，但CNT-Ag仅导致细胞壁变形。还观察到 CNT-Ag 颗粒可以被内化并封装在藻类细胞的内部囊泡中。长期暴露于碳纳米管金属会导致藻类生长延迟。浓度为5.0 mg/L的CNT-Ag表现出90%的生长抑制作用，并且对光合产量也表现出显着影响，与对照相比下降了21%。据观察，在 96 小时的暴露下，纯银对生长和光合作用的毒性比 CNT-Ag 更高。一般来说，CNT-Pt 对藻类的毒性作用明显小于 CNT-Ag。基于这项研究，推测 CNT 抑制了CNT-Ag 杂化物中Ag +的释放，从而降低了总体毒性。
更新日期：2018-10-17
中文翻译：
碳纳米管-金属杂化颗粒暴露对淡水藻类莱茵衣藻的影响。
我们首次证明了碳纳米管（CNT）金属杂化物对淡水藻类的毒性。合成了碳纳米管-银（CNT-Ag）和铂杂化物（CNT-Pt）并将其暴露于莱茵衣藻（C. Reinhardtii）中，并将它们的毒性与纯金属盐进行了比较。使用电子显微镜研究了CNT-金属和藻类之间的相互作用，观察到虽然藻类细胞的外膜因纯Ag的Ag +毒性而受损，但CNT-Ag仅导致细胞壁变形。还观察到 CNT-Ag 颗粒可以被内化并封装在藻类细胞的内部囊泡中。长期暴露于碳纳米管金属会导致藻类生长延迟。浓度为5.0 mg/L的CNT-Ag表现出90%的生长抑制作用，并且对光合产量也表现出显着影响，与对照相比下降了21%。据观察，在 96 小时的暴露下，纯银对生长和光合作用的毒性比 CNT-Ag 更高。一般来说，CNT-Pt 对藻类的毒性作用明显小于 CNT-Ag。基于这项研究，推测 CNT 抑制了CNT-Ag 杂化物中Ag +的释放，从而降低了总体毒性。
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