Selenium is an essential trace element that is more important for normal functioning of human biological system. Traditional supplements of selenium based medications have a low level of absorption and high toxicity. Hence, it is important to create an alternative and innovative method to transport selenium compounds, which would raise the bioavailability of this component and also permit its controlled discharge in the life form. Nanoscale selenium has pulled in an extraordinary enthusiasm as a nourishment added substance particularly in people with selenium inadequacy, yet additionally as a therapeutic agent without leading to any harmful side effects. In this present investigation, the black tea mediated selenium nanoparticles were synthesized by green synthesis method. The synthesized selenium nanoparticles were characterized using double beam UV visible spectrophotometer and it results in maximum absorbance at 380nm. Agar well diffusion technique was used to assess the antibacterial activity on chosen oral pathogens such as Streptococcus mutans, Staphylococcus aureus, Enterococcus feacalis. DPPH assay was assigned to determine the free radical scavenging activity. The black tea mediated selenium nanoparticles shows potent antimicrobial and antioxidant activity.
Key words: Green synthesis, black tea, Selenium nanoparticles, Antimicrobial activity, Antioxidant activity.