Microbial synthesis of nanoparticles is a green approach that interconnects nanotechnology and microbial biotechnology. The most common methods for synthesizing platinum nanoparticles are chemical techniques that are generally inexpensive and with a high volume of production. However, the need for toxic solvents in the production of nanoparticles limits their potential use in medical applications. Therefore, a green and nontoxic approach to produce metal nanoparticles is needed so that they can be used in a wide range of fields. This goal can be achieved using biological methods. The main objective of this study was to investigate the ability of actinomycetes to product PtNP for the first time. Characterization of particles was performed using UV - vis spectroscopy and dynamic light scattering (DLS). Synthesis was carried out using cell lysis supernatant. Sediment formation and obsorbance at 330 nm as revealed by UV-vis confirmed the formation of platinum nanoparticles, moreover, the results of DLS analysis indicated that platinum nanoparticle had an average size of 36 nm. In general, the results showed that actinomycetes can synthesize platinum nanoparticles. Due to the method used in this study and the use of environmentally friendly and safe materials, these nanoparticles can be considered a suitable candidate for use in medical, antimicrobial and anticancer applications in the future.

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