Synthesis and characterization of lactones by Azotobacter chroococcum

The current paper deals with new metabolites of different groups produced by the Azotobacter chroococcum XU1 strain. Until now, a wide variety of secondary metabolites were documented for this species, but some compounds are being reported for the first time. These compounds—representatives of lactones. An important finding within this survey was the production of lactones, namely 1,5-D-gluconolactone and D, L-mevalonic acid lactone. It is interesting to note that the strain produced 1,5-D-gluconolactone as a response to the substrate modification (C-source): in the D-glucose supplemented Ashby, the major compound was 1,5-D-gluconolactone instead of EPS (which is produced in the sucrose supplemented Ashby)

Exopolysaccharide-Based Bioflocculant Matrix of Azotobacter chroococcum XU1 for Synthesis of AgCl Nanoparticles and Its Application as a Novel Biocidal Nanobiomaterial

A simple and green method was developed for the biosynthesis of AgCl nanoparticles, free from Ag nanoparticles, using the exopolysaccharide-based bioflocculant of nitrogen fixing Azotobacter chroococcum XU1 strain. AgCl nanoparticles were characterized by UV-Vis, X-ray diffraction (XRD), Fourier Transform-Infra Red (FT-IR) and Scanning electron microscopy-energy dispersive X-ray (SEM-EDX). The concentration-dependent and controllable method for the synthesis of AgCl nanoparticles of a certain size and morphology was developed. As-synthesized AgCl nanoparticles were characterized bya high content of AgCl and exhibited strong antimicrobial activity towards pathogenic microorganisms such as E. coli, S. aureus and C. albicans. The biofabricated AgCl nanoparticles can be exploited as a promising new biocidalbionanocomposite against pathogenic microorganisms