Effects of Modified Magnetite Nanoparticles on Bacterial Cells and Enzyme Reactionsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 14 октября 2020 г.
Аннотация:Current paper presents biological effects of magnetite nanoparticles (MNPs). Analyzingeffects of MNP’ characteristics (zeta‐potential and hydrodynamic diameters) on bacteria and theirenzyme reactions was the main focus. Photobacterium phosphoreum and bacterial enzymatic reactions were chosen as bioassays. Three types of MNPs were under study: bare Fe3O4, Fe3O4 modified with 3‐aminopropyltriethoxysilane (Fe3O4/APTES), and humic acids (Fe3O4/HA). Effects of the MNPswere studied at a low concentration range (< 2 mg/L) and attributed to availability and oxidativeactivity of Fe3+, high negative surface charge, and low hydrodynamic diameter of Fe3O4/HA, as wellas higher Fe3+ content in suspensions of Fe3O4/HA. Low‐concentration suspensions of bare Fe3O4provided inhibitory effects in both bacterial and enzymatic bioassays, whereas the MNPs withmodified surface (Fe3O4/APTES and Fe3O4/HA) did not affect the enzymatic activity. Under oxidative stress (i.e., in the solutions of model oxidizer, 1,4‐benzoquinone), MNPs did not reveal antioxidant activity, moreover, Fe3O4/HA demonstrated additional inhibitory activity. The study contributes to the deeper understanding of a role of humic substances and silica in biogeochemicalcycling of iron. Bioluminescence assays, cellular and enzymatic, can serve as convenient tools toevaluate bioavailability of Fe3+ in natural dispersions of iron‐containing nanoparticles, e.g., magnetite, ferrihydrite, etc.