Abstract
It was found that if introduced into a nutrient medium of 0.05–1 g/L nano-SiO2, the oxidant activity (OA) of the culture medium (CM) of bacilli increased by 43.2–60.1 % and the antioxidant activity (AA) decreased by 4.5–11.8 %. SiO2 nanoparticles had different effects on antiradical activity (ARA) of the CM of Bacillus subtilis IMV B-7023. In particular, nano-SiO2 had no significant effect on the ability of the CM of bacilli to inactivate the 2.2-diphenyl-1-picrylhydrazyl (DPPH·) free radical. However, for the content of the nanomaterial of 0.01–1 g/L decreased hydroxyl radical scavenging in the CM of B. subtilis IMV B-7023 on 7.2–17.6 % compared with a control. Low doses of silica nanoparticles stimulated the reducing power of the CM of bacteria and then highly suppressed it.
Highlights
High antioxidant and antiradical properties of Bacillus subtilis IMV B-7023 [1] allow the recommend of bacterial preparations that are based on this strain for crops which are exposed to aggressive stress agents
Silica nanoparticles can penetrate into the cells [19], but increasingly, their biological effect is associated with the pronounced membranotropic properties
According to the literature [5, 7], silica nanoparticles interact with the lipid bilayer of cell membranes that can stimulate the excessive formation of reactive oxygen species (ROS), which are biological factors of the peroxidation of bio-effecting molecules [6]
Summary
High antioxidant and antiradical properties of Bacillus subtilis IMV B-7023 [1] allow the recommend of bacterial preparations that are based on this strain for crops which are exposed to aggressive stress agents. That the introduction of these organisms into agroecosystem will have an influence on disperse materials of various nature [2], in particular nanomaterials, the dimensions of which are at least in one geometric dimension of less than 100 nm [3]. The unique properties of nano-sized silica, such as high specific surface area, mechanical and thermal resistance, the ability to pass UV radiation, and the lack of photodegradation, found their application in various fields [5]. The purpose of this work was to study the influence of silica nanoparticles on antioxidant and antiradical properties of B. subtilis IMV В-7023
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