ArticleJournal of the American Society for Mass Spectrometry2007
Hydration of potassiated amino acids in the gas phase.
Article in Journal of the American Society for Mass Spectrometry, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- Gas-phase hydration thermochemistry of sodiated and potassiated nucleic acid bases.Journal of the American Society for Mass Spectrometry · 2012Article
- Thermochemistry of microhydration of sodiated and potassiated monosaccharides.Journal of the American Society for Mass Spectrometry · 2011Article
- Hydration energies of deprotonated amino acids from gas phase equilibria measurements.Journal of the American Society for Mass Spectrometry · 2008Article
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1 author.
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Abstract
The thermochemistry of stepwise hydration of several potassiated amino acids was studied by measuring the gas-phase equilibria, AAK(+)(H(2)O)(n-1) + H(2)O = AAK(+)(H(2)O)(n) (AA = Gly, AL, Val, Met, Pro, and Phe), using a high-pressure mass spectrometer. The AAK(+) ions were obtained by electrospray and the equilibrium constants K(n-1,n) were measured in a pulsed reaction chamber at 10 mbar bath gas, N(2), containing a known partial pressure of water vapor. Determination of the equilibrium constants at different temperatures was used to obtain the DeltaH(n)(o), DeltaS(n)(o), and DeltaG(n)(o) values. The results indicate that the water binding energy in AAK(+)(H(2)O) decreases as the K(+) affinity to AA increases. This trend in binding energies is explained in terms of changes in the side-chain substituent, which delocalize the positive charge from K(+) to AA in AAK(+) complexes, varying the AAK(+)-H(2)O electrostatic interaction.
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