Figure 6.

Oyster glycogen (pH 9.6) in H₂O and D₂O. (a) The Z-spectra (B₁ = 0.4 μT) of glycogen (100 mM, pH 9.6) in H₂O (95% H₂O/5% D₂O) and D₂O (95% D₂O/5% H₂O). The bottom panel shows the magnetization transfer difference signal of these Z-spectra after removing the direct water saturation background. (b) The H1-4 NOE peak (+0.6 ppm) intensity as a function of B₁ saturation power. The H1-4 NOE rates (σ₁) were fitted according to Eqs. 4 and 7 and assuming the slow tumbling limit ($\frac{{\sigma }_{ae}}{{\rho }_e}\approx \text{-}1$).