Green synthesis of functional metallic nanoparticles by dissimilatory metal-reducing bacteria Shewanella : A comprehensive review

The biosynthesis strategy of nanoparticles has attracted much attention due to the mild synthesis condi-tions, environmental-friendly properties, and low costs. Biosynthesized nanoparticles (bio-NPs) not only show excellent physicochemical properties, but also exhibit high stability, enlarged specific surface area, and excellent biocompatibility, which are crucial for industrial, agricultural, and medical fields. She-wanella, a kind of dissimilatory metal-reducing bacteria, is regarded as a typical biosynthesis-functional bacteria class with wide distribution and strong adaptability. Thus, in this paper, functional bio-NPs by Shewanella were reviewed to provide a comprehensive view of current research progress. The biosynthetic mechanisms of Shewanella are summarized as the Mtr pathway (predominant), extracellular polymeric substance-induced pathway, and enzyme/protein-induced pathway. During the biosynthesis process, bio-logical factors along with the physicochemical parameters highly influenced the properties of the resul-tant bio-NPs. Till now, bio-NPs have been applied in various fields including environmental remediation, antibacterial applications, and microbial fuel cells. However, some challenging issues of bio-NPs by She-wanella remain unsolved, such as optimizing suitable bacterial strains, intelligently controlling bio-NPs, clarifying biosynthesis mechanisms, and expanding bio-NPs applications.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

Automated summary

The biosynthesis strategy of nanoparticles has gained much attention due to its mild synthesis conditions, environmental-friendly properties, and low costs. Biosynthesized nanoparticles (bio-NPs) not only possess excellent physicochemical properties, but also exhibit high stability, enlarged specific surface area, and excellent biocompatibility. This paper reviews the functional bio-NPs produced by Shewanella bacteria to provide a comprehensive understanding of current research progress. The biosynthetic mechanisms of Shewanella involve the Mtr pathway, extracellular polymeric substance-induced pathway, and enzyme/protein-induced pathway. Bio-NPs have been applied in environmental remediation, antibacterial applications, and microbial fuel cells; however, challenges regarding suitable bacterial strains, intelligent control of bio-NPs, clarification of biosynthesis mechanisms, and expanding their applications remain unsolved.