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From the pressure dependence of  1 H high resolution NMR spectra of two dipeptides (glycylsarcosine and N-acetyl-ʟ-proline-NH-methylamide in the range 0.1 MPa ≤p ≤ 150 MPa the activation volumes ⊿V ≠  for the amide rotation are derived. This conformational transition is characterized for glycylsarcosine by ⊿V ≠  = 4 ± 1 cm 3  · mol -1  and for. the proline derivative by ⊿V ≠  = 7.5±1 cm 3  · mol -1 . From the given results the maximum contribution of proline cis ⇌ trans isomerisation to the pressure dependence of the rate of reactivation of proteins can be estimated to ~ - 30% per MPa and proline present.

Free Activation Energies and Activation Volumes for the Amide Rotation in Some Peptides Studied by High Pressure 1 H-High Resolution NMR