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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 2.

Figure 2

a) Representative polarization buildup curves of 1.4 M [1-13C]pyruvate in 1:1 (v/v) glycerol:water glassing matrix doped with 15 mM trityl OX063 and mixed with different concentrations of Gd3+. These curves were taken by irradiating the samples at 94.072 GHz with a 100 mW microwave source at 3.35 T and 1.4 K. The solid lines are fits to a mono-exponential buildup equation. b) The maximum 13C nuclear polarization of [1-13C]pyruvate sample as a function of Gd3+ concentration at 3.35 T and 1.4 K. c) Polarization buildup time constant τbu versus Gd3+ concentration derived by fitting the polarization buildup curves with a single-exponential buildup equation.