Table 2. The static dielectric constant and relaxation time constant of amino acids and neurotransmitters.

		Theoretical (T = 298 K)		Experimental (T = 298 K)
Material	In Zwitterion Form	ε0	τD(ps)	ε0	τD(ps)
Gly 1 M	NH3+- CH2- COO−	97.36 ± 3.7	20.81 ± 2.6	100.44	22.73
Ala 1 M	CH3- CH- NH3+- COO−	89.52 ± 2.5	33 ± 2.4	103.54	30.871
Glu 1 M	COOH - CH2 - CH2 - NH3+- COO−	105.5 ± 1.3	155.5 ± 6
Gaba 1 M	NH3+ - CH2 - CH2 - CH2- COO−	120.72 ± 1.7	126.55 ± 2.6	128	11714
Dopamine 1 M	C6H3(OH)(O−) - CH2 - CH2 - NH3+	102.7 ± 3.9	137.52 ± 5.2