The effect of iron-chelating agents on Magnetospirillum magneticum strain AMB-1: stimulated growth and magnetosome production and improved magnetosome heating properties.
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/g(Fe) in the absence of iron-chelating agent up to ∼444 W/g(Fe) in the presence of 4 μM rhodamine B and to ∼723 W/g(Fe) in the presence of 4 μM EDTA. These observations were made at an iron concentration of 20 μM and iron-chelating agent concentrations below 40 μM.
Institut de minéralogie et de physique des milieux condensés, UMR 7590 CNRS, Université Pierre et Marie Curie, 4 Place Jussieu, 75005, Paris, France. edouardalphandery@hotmail.com
Edouard
E
Alphandéry
Matthieu
M
Amor
François
F
Guyot
Imène
I
Chebbi
D003470:Culture Media / Q000737:chemistry; D004492:Edetic Acid / Q000378:metabolism; D007502:Iron Chelating Agents / Q000378:metabolism*; D055944:Magnetosomes / Q000378:metabolism*; D042201:Magnetospirillum / Q000254:growth & development* / Q000378:metabolism*; D012235:Rhodamines / Q000378:metabolism
D003470:Culture Media; D007502:Iron Chelating Agents; D012235:Rhodamines; D004492:Edetic Acid; C029773:rhodamine B