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Article Dans Une Revue European Journal of Mass Spectrometry Année : 2003

Gas-phase basicity of glycine, alanine, proline, serine, lysine, histidine and some of their peptides by the thermokinetic method

Résumé

The thermokinetic method is applied to a set of six amino acids (glycine, alanine, proline, serine, lysine, histidine) and 30 of their di-and tri-peptides for which experimental proton transfer rate constants were available. The comparison between the presently determined gas-phase basicities, GBs, of the amino acids with values obtained from equilibrium constant determination is generally good (a mean deviation of ∼3 kJ mol−1 is observed). Derived proton affinities values are discussed. The gas-phase basicities of peptides provided by the present study correct several previously estimated values thus offering a more firm basis for structural discussion. Composite reaction efficiency curves indicate the existence, for several peptides, of at least two non-interconverting populations of protonated forms.
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Dates et versions

hal-00068599 , version 1 (17-10-2018)

Identifiants

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Guy Bouchoux, Jean-Yves Salpin. Gas-phase basicity of glycine, alanine, proline, serine, lysine, histidine and some of their peptides by the thermokinetic method. European Journal of Mass Spectrometry, 2003, 9 (4), pp.391-402. ⟨10.1255/ejms.568⟩. ⟨hal-00068599⟩
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