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. Author manuscript; available in PMC: 2013 May 31.
Published in final edited form as: J Phys Chem A. 2012 May 18;116(21):5129–5138. doi: 10.1021/jp302399f

Figure 5.

Figure 5

a) Polarization buildup curves of 1:1 (v/v) [1-13C]pyruvic acid:sulfolane doped with 40 mM BDPA and mixed with different concentrations of Gd3+ at 3.35 T and 1.4 K. The buildup was monitored by irradiating the samples at 94.055 GHz with a 100 mW microwave source. b) the maximum 13C nuclear polarization of [1-13C]pyruvate sample as a function of Gd3+ concentration derived from Figure 5ac) Polarization buildup time constant versus Gd3+ concentration derived by fitting single-exponential buildup equation of data from Figure 5a.