Abstract
A rich variety of magnetic phenomena is observed in Mössbauer studies of ferritin. Depending on the amount of iron in the horse spleen ferritin core, a paramagnetic relaxation spectrum, or quadrupole split doublet or a magnetically split sextet showing superpara-magnetism, are obtained a 4.1 K. Mössbauer studies of the recently prepared iron loaded concanavalin A yield hyperfine parameters identical to those found previously in mammalian ferritin, yet show the existence of larger iron aggregates. Due to the larger particle size it is possible to follow the magnetic hyperfine field and to obtain the magnetic ordering temperature as 240 K. This is exactly the Neél temperature of ferrihydrite, thus establishing that this is indeed the iron compound in the ferritin core.
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Bauminger, E.R., Nowik, I. Magnetism in plant and mammalian ferritin. Hyperfine Interact 50, 489–497 (1989). https://doi.org/10.1007/BF02407681
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DOI: https://doi.org/10.1007/BF02407681