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首页> 外文期刊>Bioprocess and Biosystems Engineering >A comparative ecotoxicity analysis of α- and γ-phase aluminium oxide nanoparticles towards a freshwater bacterial isolate Bacillus licheniformis
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A comparative ecotoxicity analysis of α- and γ-phase aluminium oxide nanoparticles towards a freshwater bacterial isolate Bacillus licheniformis

机译：α相和γ相氧化铝纳米粒子对淡水细菌分离地衣芽孢杆菌的比较生态毒性分析

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摘要

Crystalline structure of nanoparticles may influence their physicochemical behaviour as well as their toxicological impact on biota. The differences in orientation of the atoms result in the variations in chemical stability. Thus, toxicological impacts of different crystalline phases of aluminium oxide nanoparticles are expected to vary. The present study brings out a comparative toxicity analysis of γ-phase and α-phase aluminium oxide nanoparticles of comparable hydrodynamic size range towards a freshwater bacterial isolate Bacillus licheniformis at low exposure concentrations (5, 1, 0.5 and 0.05 μg/mL). Upon 2-h exposure, the α-aluminium oxide particles showed lower toxicity than the γ-phase aluminium oxide. The lower level of oxidative stress generation and cell membrane damage in case of the α-phase aluminium oxide nanoparticles substantiated the toxicity results. The involvement of protein, lipopolysaccharides in nanoparti-cle-cell surface interaction, was noted in both the cases. To conclude, the crystallinity of aluminium oxide nanoparticles played an important role in the interaction and the toxicity response.
机译：纳米粒子的晶体结构可能影响其理化行为以及对生物群的毒理学影响。原子取向的差异导致化学稳定性的变化。因此，预期氧化铝纳米颗粒的不同晶相的毒理学影响是变化的。本研究对低暴露浓度（5、1、0.5和0.05μg/ mL）对淡水细菌分离的地衣芽孢杆菌（Bacillus licheniformis）具有相当的水动力尺寸范围的γ相和α相氧化铝纳米粒子进行了比较毒性分析。暴露2小时后，α-氧化铝颗粒的毒性低于γ-相氧化铝。在α相氧化铝纳米粒子的情况下，较低水平的氧化应激产生和细胞膜损伤证实了毒性结果。在这两种情况下均注意到蛋白质，脂多糖参与纳米颗粒-细胞表面相互作用。总之，氧化铝纳米颗粒的结晶度在相互作用和毒性反应中起着重要作用。

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