Antibacterial and antioxidant properties of tellurium nanoparticles synthesized by Mariannaea sp. HJ

Abstract:

[Background] In recent years, tellurium nanoparticles (TeNPs) have been widely used in optoelectronics, energy, medicine, and other fields. Featuring mild synthesis conditions and low toxicity, biosynthetic TeNPs have attracted wide attention. However, there are few studies on the synthesis of TeNPs by fungi. [Objective] To investigate the ability of Mariannaea sp. HJ to synthesize TeNPs and the antibacterial and antioxidant properties of the TeNPs. [Methods] We used HJ to synthesize TeNPs and optimize the synthesis conditions. XRD, SEM, and DLS were employed to characterize the yielded TeNPs. In addition, we tested the antibacterial and antioxidant properties of TeNPs through experiments. [Results] The optimal synthesis conditions are as follows: 1.5 g (wet weight) of HJ, and TeO₃²⁻ at 5 mmol/L. The yielded TeNPs were mainly spherical with a hexagonal crystal system (XRD). FTIR showed that functional groups such as hydroxyl, carboxyl, and amino were involved in the synthesis of TeNPs. The TeNPs inhibited Staphylococcus aureus and DPPH (inhibition rate=80%at 500 mg/L). [Conclusion] This study provides a TeNPs-synthesizing fungal strain, which lays a theoretical basis for the biosynthesis and application of TeNPs.