Biosythesis of Selenium andTellurium Nano alloys using probiotic bacteria and their toxicological studies on Paramecium

Rawal, Vidushi
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Selenium and Tellurium are two elements that have gradually gained much importance over the years due to their notable biological effects and applications. In our experiment , we exposed Lactobacillus casei to different concentrations of Sodium Hydrogen Selenite (NaHSeO3) and Sodium Tellurite (Na2TeO3). The resulting stable Se-Te nano alloys formed were then extracted from the cell by lysosomal action and further purification. Electron Microscopy shows the gradual change in shape of nano alloys from (spherical to rod) with concentration change, the average particle size ranging from 250 to 450 nm. ICP-MS confirms that bacteria are indeed not selective for either element and synthesise Se-Te nanoalloys using the same mechanism. The nanoparticles exhibit no toxic harm on Paramecium sp. used for toxicological studies. On further comparison with Gold and Silver Nanoparticles, Se-Te Nanoalloys prove to have comparatively lower toxicity on the eukaryotic test model. The evident lower toxicity and physio-chemical properties of these alloy particles are being studied further to identify specific fields of application and relevance.
nanoparticles, Selenium, Tellurium, toxicity