Table 2.

Experimental Results of ¹³C NMR Relaxation Times T₁ and T_1ρ for Water Hydrated Elastin^a

samples	I	II	III	IV	V
Carbonyl Carbons
T1(s)	4.3 ±0.3	5.0 ± 0.4	4.1 ± 0.4	3.5 ± 0.4	4.2 ± 0.4
T1ρ (ms)	4.3 ± 0.2	5.2 ± 0.3	6.0 ± 0.4	7.5 ± 0.7	4.6 ± 0.3
τc(s)	(8.14 ± 0.48) × 10−7	(7.98 ± 0.54) × 10−7	(6.72 ± 0.54) × 10−7	(5.55 ± 0.55) × 10−7	(7.78 ± 0.64) × 10−7
CD (s−2)	(1.43 ± 0.02) × 108	(1.21 ± 0.01) × 108	(1.24 ± 0.02) × 108	(1.20 ± 0.02) × 108	(1.40 ± 0.02) × 108
Aliphatic Carbons
T1(s)	0.90 ± 0.06	0.68 ± 0.05	0.98 ± 0.07	0.94 ± 0.07	0.93 ± 0.11
T1ρ (ms)	2.34 ± 0.14	1.90 ± 0.09	3.39 ± 0.25	3.78 ± 0.36	2.47 ± 0.29
τc(s)	(5.04 ± 0.28) × 10−7	(4.86 ± 0.23) × 10−7	(4.37 ± 0.30) × 10−7	(4.05 ± 0.36) × 10−7	(4.99 ± 0.55) × 10−7
CD (s−2)	(4.23 ± 0.02) × 108	(5.40 ± 0.06) × 108	(3.37 ± 0.02) × 108	(3.26 ± 0.03) × 108	(4.06 ± 0.03) × 108

^aIn the table, τ_c and C_D (defined in the text) were determined by using eqs 3 and 4 and the ¹³C T₁ and T_1ρ relaxation times. The respective values shown after the ± represent standard error from the measurements.