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Dielectric Increments & Dervied Dipole Moments for some Amino Acids & Glycine Peptide Chains in Aqueous Solution at 25C

Sample Dielectric Increment δ Debye Units (from eqn 3.5*) References
α-Alanine 23.2 15.9 13
27.7 17.4 14
l-Asparagine 28.4 17.6 14
20.4 14.9 16
l-Aspartic Acid 27.8 17.4 14
d-Glutamic Acid 26 16.8 14
l-Glutamine 20.8 15.1 16
Glycine 22.6 15.7 13
26.4 17.0 14
l-α-Leucine 25 16.5 14
Glycine Dipeptide 70 27.6 14
70.5 27.7 17
Glycine Tripeptide 113 35.1 13
128 37.3 17
Glycine Tetrapeptide 159 41.6 13
Glycine Pentapeptide 215 48.4 13
Glycine Hexapeptide 234 50.5 13
Glycine Heptapeptide** 290 56.2 5
Taken from Pethig p.80

* Equ 3.5: = 3.30 δ01/2

** In 5.14 molar urea

Reference 5: J Wyman, J. Am. Chem. Soc., 14 1 (1959)

Reference 13: J. Wyman and T. L. McMeekin, J. Am. Chem. Soc., 55, 908 (1933)

Reference 14: P. Devoto, Gazz. Chim. Ital., 60, 520 (1930); 61, 897 (1931); 64, 76 (1934)

Reference 16: H. Greenstein and J Wyman, J Am. Chem. Soc., 58, 463 (1936)

Reference 17: A. Cavallaro, Arch. Sci. Biol., 20, 567 (1934)