Abstract
Specialist bacteria can synthesize nanoparticles from various metal ions in solution. Metal recovery with high efficiency can be achieved by metal-tolerant microorganisms that proliferate in a concentrated metal solution. In this study, we isolated bacteria (Pseudomonas sp. strain KKY-29) from a bacterial library collected from water near an abandoned mine in Komatsu City, Ishikawa Prefecture, Japan. KKY-29 was maintained in nutrient medium with lead acetate and synthesized hydrocerussite and pyromorphite nanoparticles inside the cell; KKY-29 also survived nanoparticle synthesis. Quantitative PCR analysis of genes related to phosphate metabolism showed that KKY-29 decomposed organic phosphorus to synthesize lead phosphate. KKY-29 also deposited various metal ions and synthesized metal nanoparticles when incubated in various metal salt solutions other than lead. The present study considers the development of biotechnology to recover lead as an economically valuable material.
Highlights
Sci. 2022, 23, 2483. https://doi.org/Elements are largely divided into metallic and nonmetallic elements
The water samples were spread on nutrient agar medium containing lead acetate
The strain KKY-29 was identified as a bacterium with lead resistance and the ability to synthesize nanoparticles from fresh water collected from an abandoned mine
Summary
Sci. 2022, 23, 2483. https://doi.org/Elements are largely divided into metallic and nonmetallic elements. Both essential and non-essential elements can be toxic if ingested in excess Since their discovery, humans have employed metals in all practices of life. Heavy metals have become important in the modern industrialized landscape, where they have been utilized in various products such as paints, batteries, computers, and fertilizers. Heavy metals accumulate in plants and animals and cause irreversible damage at the cellular level, where they inhibit enzyme activity, disturb the functioning of essential elements, and promote the prevalence of reactive oxygen species [2,3,4]
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