Dielectric Increments & Dervied Dipole Moments for some Amino Acids & Glycine Peptide Chains in Aqueous Solution at 25°C
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: µ = 3.30 δ₀^1/2

** 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)