Abstract
Dielectric analysis (DEA), supported by thermogravimetric analysis (TG), differential scanning calorimetry (DSC), powder X-ray diffraction analysis (PXRD) and photomicrography, reveal the chiral difference in the amino acids. The acids are classified as dielectric materials based on their structure, relating chirality to the vector sum of the average dipole moment, composed of the constant optical (electronic) and infra-red (atomic) polarizabilities, as well as dipole orientation. This study encompasses 14 L-and D-amino acid isomers. Physical properties recorded include AC electrical conductivity, charge transfer complexes, melting, recrystallization, amorphous and crystalline phases, and relaxation spectra, activation energies and polarization times for the electrical charging process.
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References
M. G. Finn, Chirality, 14 (2002) 534.
M. Koźbiał, J. Poznański, E. Utzig and J. Lipkowski, J. Therm. Anal. Cal., 83 (2006) 575.
H. Frohlich, Theory of Dieletrics: Dieletric Constant and Dieletric Loss, Oxford Science Publications, Oxford 1986, pp. 104–121.
P. J. Haines Ed., Principles of Thermal Analysis and Calorimetry, RSC Paperbacks, Cambridge 2002, p. 99.
J. Cahoon, A. Riga and V. Lvovich, Materials Characterization by Dynamic and Modulated Thermal Analytical Techniques, ASTM STP 1402, American Society for Testing and Materials, West Conshohocken, PA 2001, pp. 157–173.
A. Riga, J. Cahoon and J. W. Pialet, Materials Characterization by Dynamic and Modulated Thermal Analytical Techniques, ASTM STP 1402, American Society for Testing and Materials, West Conshohocken, PA 2001, pp. 139–156.
L. Presswala, M. E. Matthews, I. Atkinson, O. Najjar, N. Gerhardstein, J. Moran, R. Wei and A. Riga, Hydration of Crystalline Amino Acids with Bound and Unbound Water Revealed by Thermal Analysis, NATAS Conference, August 2007, Lansing, Michigan.
Netzsch Instruments, Inc., 37 North Ave., Burlington, MA 01803
TA Instruments, 109 Lukens Drive, New Castle, DE 19720
A. Riga and K. Alexander, Amer. Pharm. Rev., 6(45) (2005) 50.
H. Frohlich, Theory of Dieletrics: Dieletric Constant and Dieletric Loss, Oxford Science Publications, Oxford 1986, p. 122.
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Matthews, M.E., Atkinson, I., Presswala, L. et al. Dielectric classification of D-and L-amino acids by thermal and analytical methods. J Therm Anal Calorim 93, 281–287 (2008). https://doi.org/10.1007/s10973-007-8835-8
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DOI: https://doi.org/10.1007/s10973-007-8835-8