Ultrasonic absorption of antamanide in different solvents was measured in the frequency range of 0.5–100 MHz. Three relaxation effects could be resolved, each occurring at a given frequency which remains unchanged for the different solvents. The slowest effect disappears upon Na + ‐complex formation. It is ascribed to a conformational transition of the peptide backbone. Rate constants of this effect are in the range of 10 6 s −1 . The two other relaxation effects may be caused by rotational isomerism of amino‐acid side chains. The solvent dependence of the structural conformations is discussed.
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Bürgermeister et al. (1974) studied this question.
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