Extracellular biosynthesis of magnetite using fungi |
| |
Authors: | Bharde Atul Rautaray Debabrata Bansal Vipul Ahmad Absar Sarkar Indranil Yusuf Seikh Mohammad Sanyal Milan Sastry Murali |
| |
Affiliation: | Nanoscience Group, Materials Chemistry Division, National Chemical Laboratory, Pune, India. |
| |
Abstract: | The development of synthetic processes for oxide nanomaterials is an issue of considerable topical interest. While a number of chemical methods are available and are extensively used, the collaborations are often energy intensive and employ toxic chemicals. On the other hand, the synthesis of inorganic materials by biological systems is characterized by processes that occur at close to ambient temperatures and pressures, and at neutral pH (examples include magnetotactic bacteria, diatoms, and S-layer bacteria). Here we show that nanoparticulate magnetite may be produced at room temperature extracellularly by challenging the fungi, Fusarium oxysporum and Verticillium sp., with mixtures of ferric and ferrous salts. Extracellular hydrolysis of the anionic iron complexes by cationic proteins secreted by the fungi results in the room-temperature synthesis of crystalline magnetite particles that exhibit a signature of a ferrimagnetic transition with a negligible amount of spontaneous magnetization at low temperature. |
| |
Keywords: | biosynthesis extracellular growth fungi magnetite nanoparticles |
本文献已被 PubMed 等数据库收录! |
|