Journal of Thermal Analysis and Calorimetry

, Volume 91, Issue 2, pp 627–632 | Cite as

Thermal stability of amino acid-(tyrosine and tryptophan) coated magnetites

  • L. Patron
  • G. Marinescu
  • D. Culita
  • L. Diamandescu
  • O. Carp
Article
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Accepted:

Abstract

The thermal stability of two amino acid-(tyrosine and tryptophan) coated magnetite and their corresponding precursors, [Fe 2 III FeII(Tyr)8]·9H2O and [Fe 2 III FeII(Trp)2(OH)4](NO3)2·8H2O (where tyrosine=Tyr and tryptophan=Trp), was analyzed in comparison with free amino acids. The complexes present a lower thermal stability relative to the free ligand, due to the catalytic effect introduced by the iron cation and the presence of NO 3 − groups. The presence of NO 3 − group determines also a different degradation’s stoichiometry of the amino acid anion comparative with the one expressed by the free ligand molecule. The amino acid bonded to magnetite decomposes in two steps, its presence inducing an increasing of γ-Fe2O3→Fe2O3 conversion temperature.

Keywords

amino acid-coated magnetite thermal analysis tryptophan tyrosine 
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References

  1. 1.
    O. Z. Yeşilel and H. Ölmez, J. Therm. Anal. Cal., 86 (2006) 211.CrossRefGoogle Scholar
  2. 2.
    N. T. Madhu, P. K. Radhakrishnan, E. Williams and W. Linert, J. Therm. Anal. Cal., 79 (2005) 157.CrossRefGoogle Scholar
  3. 3.
    M. Badea, R. Olar, D. Marinescu, G. Vasile and S. Stoleru, J. Therm. Anal. Cal., 80 (2005) 679.CrossRefGoogle Scholar
  4. 4.
    A. Ito, M. Shimkai, H. Honda and T. Kobayashi, J. Biosci. Bioenerg., 100 (2005) 1.CrossRefGoogle Scholar
  5. 5.
    S. Mornet, S. Vasseur, F. Grasset and E. Duguet, J. Mater. Chem., 14 (2004) 2161.CrossRefGoogle Scholar
  6. 6.
    S. Yu and G. H. Chow, J. Mater. Chem., 14 (2004) 2781.CrossRefGoogle Scholar
  7. 7.
    N. Fauconnier, J. N. Pons and A. Bee, J. Colloid Interface Sci., 194 (1997) 427.CrossRefGoogle Scholar
  8. 8.
    M. H. Sousa, J. C. Rubbin and F. A. Tourinho, J. Magn. Magn. Mater., 225 (2001) 67.CrossRefGoogle Scholar
  9. 9.
    K. Nakamoto, ’Infrared and Raman Spectra of Inorganic Compounds’, Ed. 4, J. Wiley&Sons, 1986, p. 223.Google Scholar
  10. 10.
    O. Carp, L. Patron, L. Diamandescu and A. Reller, Thermochim. Acta, 390 (2002) 169.CrossRefGoogle Scholar
  11. 11.
    N. J. Tang, W. Zhong, H. Y. Jiang, X. L. Wu, W. Liu and Y. W. Du, J. Mag. Mag., 282 (2004) 92.CrossRefGoogle Scholar
  12. 12.
    O. Carp, D. Gingasu, I. Mindru and L. Patron, Thermochim. Acta (in press).Google Scholar
  13. 13.
    M. Sikorska-Iwan, R. Mrozek and Z. Rzączyńska, J. Therm. Anal. Cal., 60 (2000) 139.CrossRefGoogle Scholar
  14. 14.
    R. R. Mahajan, P. S. Makashir and J. P. Agrawal, J. Therm. Anal. Cal., 65 (2001) 935.CrossRefGoogle Scholar
  15. 15.
    I. M. M. Kenawy, M. A. Hafez and R. R. Lashein, J. Therm. Anal. Cal., 65 (2001) 723.CrossRefGoogle Scholar
  16. 16.
    K. Mészáros Szécsény, V. M. Leovac, Ž. K. Jaćimović and G. Pokol, J. Therm. Anal. Cal., 74 (2003) 943.CrossRefGoogle Scholar
  17. 17.
    B. N. Sivasankar and L. Ragunath, Thermochim. Acta, 397 (2003) 237.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC. 2007

Authors and Affiliations

  • L. Patron
    • 1
  • G. Marinescu
    • 1
  • D. Culita
    • 1
  • L. Diamandescu
    • 2
  • O. Carp
    • 1
  1. 1.Institute of Physical Chemistry ‘Ilie Murgulescu’BucharestRomania
  2. 2.Institute of Atomic Physics, National Institute of Material PhysicsBucharestRomania

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