The biosynthesis of gold nanoparticles would benefit from the development of clean, nontoxic, and environmentally acceptable procedures concerning microorganisms from bacteria to fungi. Streptomyces are saprophyte bacteria that have the enormous ability to produce secondary metabolites such as vitamin B, antibiotics, and antifungi. The authors investigated biosynthesis of gold nanoparticles by Streptomycec griseus. The UV–vis and XRD spectra of the aqueous medium containing Streptomycec griseus and 1 mM HAuCl4 demonstrated the formation of gold nanoparticles after 48 h. Transmission electron microscopy micrographs showed extracellular production of gold nanoparticles with good monodispersity, spherical shape, and average size of 50 nm.
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Derakhshan et al. (2012) studied this question.
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