An ultrasonic relaxation process is observed in aqueous solutions of sodium poly(α, L-glutamic acid) containing high concentrations of LiCl and LiClO4. It arises from an equilibrium involving hydrated lithium ions and the carbonyl group of the peptide bond.
M. J. Adams, C. B. Baddiel and A. J. Matheson, J. Chem. Soc., Faraday Trans. 2, 1974, 70, 1756 DOI: 10.1039/F29747001756
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