The sediment marine samples were obtained from several places along the coastline of the Tuticorin shoreline, Tamil Nadu, India were separated for the presence of bioactive compound producing actinobacteria. The actinobacterial strain was subjected to 16Sr RNA sequence cluster analysis and identified as Nocardiopsis dassonvillei- DS013 NCBI accession number: KM098151. Bacterial mediated synthesis of nanoparticles gaining research attention owing its wide applications in nonmedical biotechnology. In the current study, a single step eco-friendly silver nanoparticles (AgNPs) were synthesized from novel actinobacteria Nocardiopsis dassonvillei- DS013 has been attempted. The actinobacterial mediated silver nanoparticles were characterized by TEM, UV-Visible, XRD, FT-IR spectroscopy. The initial detection of AgNPs was identified using UV-Vis spectrum and confirmed by the appearance of absorbance peak at 408 nm. A Fourier transform infrared spectroscopy (FT-IR) result reveals the presence of protein component in the culture supernatant may act as protecting agents. The XRD pattern indicated that the typical peaks reveal the presence of nanoparticles. The TEM morphology confirms the formation of circular and non uniform distributions of AgNPs with the size range from 30 to 80 nm. The antibacterial activity of both isolated actinobacterial (IA) and silver nanoparticles mediated actinobacterial (SNA) of Nocardiopsis dassonvillei- DS013 were done by well diffusion method against selected clinical isolates of bacteria, namely Escherichia coli, Enterococcus sp., Pseudomonas sp., Klebsiella sp., Proteus sp., Shigella sp., Bacillus subtilis, and Streptococcus sp. When compared to isolated actinobacteria, the SNA shows the better antibacterial activity against clinical isolates.
Keywords: AgNPs; Marine actinobacteria; Marine sediments; Nocardiopsis dassonvillei.
© 2020 The Author(s).