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. Author manuscript; available in PMC: 2010 May 19.
Published in final edited form as: Contrast Media Mol Imaging. 2009 Jul;4(4):183–191. doi: 10.1002/cmmi.279

Table 1.

Isomer ratios, chemical shifts (for SAP isomers) and bound water lifetimes derived from the CEST spectra (irradiation time 4s) for the series of complexes (40 mM) at 25°C.

R = Charge SAP/TSAP τM (µs) Δω (ppm) 1-(Ms/M0)
1 -CCH(CH3)2 (i-Pr) +3 61/39 37 54 0.47
2 -C(CH3)3 (t-Bu) +3 61/39 10 50 0.17
3 -CCH(CH3)(CH2CH3) (3-pentyl) +3 36/64 17 52 0.19
4 -CCH(CH2CH2CH3)2 (4-heptyl) +3 23/77 <1 45 0.07
5 -C(CH3)2COOH −1 100/0 104 48 0.69
6 -C(CH3)2COOEt +3 70/30 210 45 0.70