Table 3.

Measured $T_{1\rho }$ relaxation times for two different spin-locking fields for the samples

Assignment	$T_{1\rho }$ (ms)	$T_{1\rho }$ (ms)	${\tau }_{\text{c}}\times {10}^{-6}$ (s)
Untreated sample (DP)	$f_e$ = $3.02\times {10}^4$ (Hz)	$f_e$ = $5.87\times {10}^4$ (Hz)
Cβ-Ala, Cγ-Val	$9.49\pm 0.68$	$20.04\pm 1.10$	$4.55\pm 0.87$
22.5 ppm	$11.57\pm 0.84$	$15.09\pm 1.70$	$1.93\pm 0.91$
25.7 ppm	$3.61\pm 0.08$	$4.70\pm 0.17$	$1.93\pm 0.30$
Cβ-Val, Cβ-Pro	$4.07\pm 0.08$	$5.37\pm 0.18$	$1.99\pm 0.26$
Cβ-Phe, Cβ-Ile	$2.37\pm 0.08$	$3.88\pm 0.25$	$3.08\pm 0.54$
Cα-Gly, Cβ-Leu	$2.27\pm 0.08$	$3.16\pm 0.23$	$2.26\pm 0.53$
Cα-Ala, Cα-Leu	$2.07\pm 0.04$	$2.69\pm 0.08$	$1.92\pm 0.25$
C=O	$1.01\pm 0.02$	$1.88\pm 0.02$	$3.52\pm 0.28$
Glucose-treated sample (DP)	$f_e$ = $3.02\times {10}^4$ (Hz)	$f_e$ = $5.87\times {10}^4$ (Hz)
Cβ-Ala, Cγ-Val	$1.82\pm 0.09$	$4.11\pm 0.60$	$4.99\pm 1.41$
Cβ-Ala, Cγ-Val	$1.71\pm 0.07$	$5.34\pm 0.59$	$7.63\pm 1.69$
Cβ-Val, Cβ-Pro	$0.67\pm 0.03$	$1.78\pm 0.14$	$6.18\pm 1.09$
Cα-Gly, Cβ-Leu	$0.35\pm 0.02$	$0.92\pm 0.08$	$6.10\pm 1.46$
C=O	$12.61\pm 0.06$	$15.76\pm 0.07$	$1.73\pm 0.54$
Glucose-treated sample (CP)	$f_e$ = $3.23\times {10}^4$ (Hz)	$f_e$ = $6.25\times {10}^4$ (Hz)
Cβ-Ala, Cγ-Val	$2.29\pm 0.04$	$9.50\pm 0.9$	$10.96\pm 1.42$
22.5 ppm	$1.52\pm 0.17$	$1.48\pm 0.05$	$7.30\pm 1.10$
24.0 ppm	$2.26\pm 0.11$	$8.50\pm 1.60$	$9.40\pm 2.93$
25.7 ppm	$1.22\pm 0.04$	$4.10\pm 0.3$	$7.98\pm 0.38$
Cβ-Val, Cβ-Pro	$1.26\pm 0.03$	$6.60\pm 0.7$	$17.31\pm 3.83$
Cα-Ala, Cα-Phe	$1.01\pm 0.21$	$5.19\pm 0.41$	$16.72\pm 3.81$
C=O	$2.50\pm 0.09$	$4.40\pm 0.05$	$3.24\pm 1.23$

Correlation times were determined from the ratio of the two $T_{1\rho }$ times using Eq. 3. The applied locking field is determined by $f_e$ = ${\omega }_e/2\pi$.