Weissella oryzae DC6-facilitated green synthesis of silver nanoparticles and their antimicrobial potential

Figures & data

Figure 1. W. oryzae DC6 on TSA plate (a), W. oryzae DC6 on TSA plate supplemented with 1 mM AgNO3 (b). UV-Vis spectra of reaction mixture contain silver nanoparticles (c), respectively.

Figure 2. TEM image of spherical shaped silver nanoparticles at 20 nm (a) and 50 nm (b).

Figure 3. EDX spectrum of silver nanoparticles (a), XRD spectrum of silver nanoparticles (b), elemental mapping results indicate distribution of silver elements, TEM micrograph of silver nanoparticles pellet solution (c), and silver nanoparticles (d), respectively.

Figure 4. Particles size distribution of silver nanoparticles with respect to intensity, number and volume of silver nanoparticles.

Figure 5. Antimicrobial activity of silver nanoparticles against Staphylococcus aureus [ATCC 6538] (a), Candida albicans [KACC 30062] (b), Bacillus cereus [ATCC 14579] (c), Vibrio parahaemolyticus [ATCC 33844] (d), Escherichia coli [ATCC 10798] (e) and, Bacillus anthracis [NCTC 10340] (f), respectively.

Table I. Antimicrobial activity of silver nanoparticles against pathogenic microorganism.

Pathogenic Microorganism	Zone of inhibition (mm)*
Staphylococcus aureus [ATCC 6538]	26 ± 0.7
Candida albicans [KACC 30062]	25 ± 1
Bacillus cereus [ATCC 14579]	17 ± 0.4
Vibrio parahaemolyticus [ATCC 33844]	16 ± 0.9
Escherichia coli [ATCC 10798]	14 ± 0.4
Bacillus anthracis [NCTC 10340]	12 ± 0.2

*Mean diameter of zone of inhibition around each disc.

Figure 6. Biofilm inhibition activity of silver nanoparticles against Staphylococcus aureus [ATCC 6538] and Pseudomonas aeruginosa [ATCC 27853].