Figure 2.

Longitudinal relaxivity of GdL at 7 T. a) r ₁ in the presence of various concentrations of ZnCl₂ in HEPES (50 mM) or PBS (50 mM) ([GdL]=3 mM, pH 7.4 and 37 °C); b) r ₁ in the presence of different quantities of Ca²⁺, Mg²⁺, Cu²⁺ or Zn²⁺ ([GdL]=3 mM, 50 mM HEPES, pH 7.4 and 25 °C). c,d) r ₁ in the presence of various concentrations of ZnCl₂ in c) HSA (0.6 mM) or d) human serum (both [GdL]=1 mM, pH 7.4 and 37 °C). Values in (a), (c) and (d) represent the mean and standard deviation from 3 independent measurements.