Bacterial Exopolysaccharides as Reducing and/or Stabilizing Agents during Synthesis of Metal Nanoparticles with Biomedical Applications

Table 2

Different noncarbohydrate substituents found in microbial exopolysaccharides.

Substituent	Appearance in microbial EPS
Organic acids
Acetate	Very common
Glycerate	Pseudomonas elodea
Hydroxybutanoate	Rhizobium irifolii
Propionate	Escherichia coli
Pyruvate	Very common
Succinate	Rhizobium spp., Agrobacterium spp,
Amino acids
L-glutamate	Klebsiella
Serine	E. coli
Inorganic acids
Phosphate	Common
Sulfate	Cyanobacteria, Bacillus spp.