纳米二氧化钛对海洋大型藻类 Gracilaria lemaneiformis (Gracilariales, Rhodophyta) 的不利影响：生长和抗氧化活性,RSC Advances

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纳米二氧化钛对海洋大型藻类 Gracilaria lemaneiformis (Gracilariales, Rhodophyta) 的不利影响：生长和抗氧化活性
RSC Advances ( IF 3.9 ) Pub Date : 2018-08-16 00:00:00 , DOI: 10.1039/c8ra05156a
Jie Liu ₁ , Pinghe Yin ₂ , Ling Zhao ₃

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大型藻类是沿海海域初级生产力的主要贡献者，有助于海洋生态系统的物质循环和能量流动。这项工作的目的是评估纳米TiO ₂对龙须的生长和抗氧化活性的毒性作用。在该研究中观察到明显的生长抑制。暴露于纳米TiO ₂的藻类在15天的暴露期间在20 mg L ^-1和40 mg L ^-1显示出负生长速率。可溶性蛋白质的浓度在暴露的前3天略有增加，但随后由于纳米TiO ₂的高浓度和长时间暴露而逐渐降低。纳米二_氧化钛引起G. lemaneiformis的氧化损伤；_{随着纳米TiO 2}的增加，超氧阴离子积累，硝酸还原酶活性呈线性下降。此外，G. lemaneiformis的提取物可以清除 DPPH· 和羟基自由基的抗氧化能力。_{然而，随着纳米TiO 2}含量的增加，体外清除DPPH·和羟基自由基的能力略有下降。这项工作的结果表明，大型藻类可以成为纳米TiO ₂污染的有效生物标志物，并且可以作为评估海洋生态系统中不断增加的污染物氧化损伤的有用指标。

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Adverse effect of nano-TiO2 on the marine macroalgae Gracilaria lemaneiformis (Gracilariales, Rhodophyta): growth and antioxidant activity

Macroalgae, the major contributor of primary productivity in coastal seas, contribute to the material cycle and energy flow in marine ecosystems. The purpose of this work was to evaluate the toxic effect of nano-TiO₂ on the growth and antioxidant activity of Gracilaria lemaneiformis. An obvious inhibition of growth was observed in this study. The algae exposed to nano-TiO₂ showed a negative growth rate at 20 mg L⁻¹ and 40 mg L⁻¹ during the 15 days exposure. The concentration of soluble protein increased slightly during the first 3 days of exposure, but it gradually diminished thereafter due to the high concentrations of nano-TiO₂ and to prolonged exposure. Nano-TiO₂ caused oxidative damage in G. lemaneiformis; superoxide anions accumulated, and nitrate reductase activity decreased linearly with the increase in nano-TiO₂. Furthermore, extracts of G. lemaneiformis can scavenge DPPH· and hydroxyl radicals for their antioxidant capacity. However, the capacity to scavenge DPPH· and hydroxyl radicals in vitro decreased slightly with the increase in nano-TiO₂. The results from this work imply that macroalgae can be an effective biomarker of nano-TiO₂ contamination and can be useful indicators to evaluate the oxidative damage of increasing pollutants in marine ecosystems.

更新日期：2018-08-16

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