Health Services Vocational School of Higher Education, T. C. Istanbul Aydin University, Sefakoy Kucukcekmece, 34295, Istanbul, Turkey.
Application and Research Center for Advanced Studies, T. C. Istanbul Aydin University, Sefakoy Kucukcekmece, 34295, Istanbul, Turkey.
Environ Monit Assess. 2020 Apr 10;192(5):276. doi: 10.1007/s10661-020-08254-w.
To assess the fate and behavior of engineered nanoparticles in the environment, it is important to examine the physicochemical and toxicological transformation of nanoparticles as they age in seawater. In this study, we investigated how aging and seawater conditions altered the physiochemical structure of nanoparticles and affected their interactions with bacteria. For this purpose, zinc oxide nanoparticles were aged under different seawater conditions by keeping them in 1%, 10%, and 100% seawater for 1 day and 20 days. The main physicochemical parameters (surface chemistry, chemical composition, particle size, and zeta potential) and toxicity of aged nanoparticles towards gram-negative Pseudomonas aeruginosa and gram-positive Staphylococcus aureus were examined. The results indicated that aged zinc oxide nanoparticles in various concentrations of seawater changed their surface chemistry, chemical composition, particle size, and zeta potentials. Growth inhibition results were observed in that the inhibition of gram-negative (Pseudomonas aeruginosa) bacteria was higher compared with the gram-positive (Staphylococcus aureus) bacteria, and Staphylococcus aureus activated with the aged zinc oxide nanoparticles. Also, the results showed that the key biochemical factors affected by the aging and seawater concentration.
为了评估工程纳米粒子在环境中的命运和行为，研究纳米粒子在海水中老化时的物理化学和毒理学转化非常重要。在这项研究中，我们研究了老化和海水条件如何改变纳米粒子的物理化学结构，并影响它们与细菌的相互作用。为此，通过将氧化锌纳米粒子在 1%、10%和 100%的海水中分别保持 1 天和 20 天，研究了它们在不同海水条件下的老化过程。考察了老化纳米粒子对革兰氏阴性假单胞菌和革兰氏阳性金黄色葡萄球菌的主要物理化学参数（表面化学、化学成分、粒径和zeta 电位）和毒性。结果表明，在不同浓度海水中老化的氧化锌纳米粒子改变了它们的表面化学、化学成分、粒径和 zeta 电位。观察到生长抑制结果表明，与革兰氏阳性（金黄色葡萄球菌）细菌相比，革兰氏阴性（假单胞菌）细菌的抑制作用更高，并且用老化的氧化锌纳米粒子激活了金黄色葡萄球菌。此外，结果表明，关键的生化因素受到老化和海水浓度的影响。
