Currently, an interesting alternative to synthetic magnetic Fe3O4 nanoparticles, called magnetosome, has been found in magnetotactic bacteria. It has been reported that Acidithiobacillus ferrooxidans (At. ferrooxidans) has a potential to synthesize magnetosome.
Biocompatibility evaluation of magnetosomes formed by Acidithiobacillus ferrooxidans
We work with Magnetospirillum gryphiwaldense and some cocci, they appear to be sensitve to oxygen concentration as well as iron concentration. I would assume that thiobacillus ferroxidans might be able to produce magnetite as well as greigeite or a mixture thereof, one has to try seeveral ironsalt concentrations as well as oxygen (gradients) in order to find the right conditions for nanoparticle formation. :)
you are very wellcome. Also try with water that has been aired i.e. oxygenized beforehand. Good luck :)
Per
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