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The effect of iron-chelating agents on Magnetospirillum magneticum strain AMB-1: stimulated growth and magnetosome production and improved magnetosome heating properties |
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| Authors: | Edouard Alphandéry Matthieu Amor Fran?ois Guyot Imène Chebbi |
| Institution: | 1. Institut de min??ralogie et de physique des milieux condens??s, UMR 7590 CNRS, Universit?? Pierre et Marie Curie, 4 Place Jussieu, 75005, Paris, France 2. Nanobacterie SARL, 36 boulevard Flandrin, 75016, Paris, France 3. Equipe G??obiosph??re Actuelle et Primitive, Institut de Physique du Globe de Paris, Universit?? Paris Diderot, Sorbonne Paris Cit??, UMR 7154 CNRS, Universit?? Paris Diderot, 1 rue Jussieu, 75005, Paris, France |
| Abstract: | The introduction of various iron-chelating agents to the Magnetospirillum magneticum strain AMB-1 bacterial growth medium stimulated the growth of M. magneticum strain AMB-1 magnetotactic bacteria and enhanced the production of magnetosomes. After 7?days of growth, the number of bacteria and the production of magnetosomes were increased in the presence of iron-chelating agents by factors of up to ??2 and ??6, respectively. The presence of iron-chelating agents also produced an increase in magnetosome size and chain length and yielded improved magnetosome heating properties. The specific absorption rate of suspensions of magnetosome chains isolated from M. magneticum strain AMB-1 magnetotactic bacteria, measured under the application of an alternating magnetic field of average field strength ??20?mT and frequency 198?kHz, increased from ??222?W/gFe in the absence of iron-chelating agent up to ??444?W/gFe in the presence of 4???M rhodamine B and to ??723?W/gFe in the presence of 4???M EDTA. These observations were made at an iron concentration of 20???M and iron-chelating agent concentrations below 40???M. |
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