Dielectric classification of <Emphasis Type="Italic">D</Emphasis>-and <Emphasis Type="Italic">L</Emphasis>-amino acids by thermal and analytical methods |
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Authors: | M E Matthews I Atkinson Lubaina Presswala O Najjar Nadine Gerhardstein R Wei Elizabeth Rye A T Riga |
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Institution: | (1) Department of Chemistry, Cleveland State University, Cleveland, Ohio 44115, USA |
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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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Keywords: | activation energy chiral recognition dielectric analysis (DEA) dipole orientation polarization |
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