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A proton magnetic relaxation study of human ferrihaemoglobin in aqueous salt solutions

The proton magnetic relaxation time, T1, has been measured at 29 MHz in 0.1M KH2PO4 and 0.1M NaCI (both pH 6) aqueous solutions of human ferrihaemoglobin, the protein concentrations ranging from 0.5 to 5 mM per haem. The linear dependence on protein concentration of the enhancement in relaxation rates, Δ(1/T1), due to the presence of the paramagnetic iron in haemoglobin was confirmed at 34°C and at ∼10°C. In the middle temperature range there is a thermally activated process, whose energy of activation depends on protein concentration. This dependence is different for the two salt solutions; Ea increases with cHb for 0.1M KH2PO4 and decreases for 0.1M NaCI.