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Dynamic hydration numbers for biologically important ions.

Michael Y Kiriukhin1, Kim D Collins

  • 1Department of Biochemistry and Molecular Biology, University of Maryland Medical School, Baltimore, MD 21201-1503, USA.

Biophysical Chemistry
|October 16, 2002
PubMed
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This study quantifies tightly bound water for 23 biologically significant ions, revealing that ion hydration volume, not just charge, influences solution properties. These findings impact our understanding of ionic interactions in biological systems.

Area of Science:

  • Biophysical Chemistry
  • Solution Chemistry
  • Biochemistry

Background:

  • Ionized groups play crucial roles in biological systems, largely dictated by their water affinity.
  • Tightly bound water molecules associated with ions increase their effective size in solution.

Purpose of the Study:

  • To accurately determine the tightly bound water for 23 biologically significant ions.
  • To calculate the radius of the equivalent hydrated sphere (r(h)) for each ion.
  • To investigate the relationship between ion hydration volume and solution properties.

Main Methods:

  • Apparent dynamic hydration number determination using Sephadex G-10 size exclusion chromatography.
  • Calculation of the radius of the equivalent hydrated sphere (r(h)).

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Main Results:

  • First accurate determination of tightly bound water for 23 ions, including H+ and HO-.
  • The ratio of hydrated volumes for two ions approximates the ratio of the square of their charges.
  • Hydrated ion volume is a significant factor in solution properties.

Conclusions:

  • Ionic strength effects may stem from local hydration shell interactions rather than long-range electric fields.
  • Understanding ion hydration is key to explaining solution behavior in biological contexts.
  • Apparent dynamic hydration number provides a measure of tightly bound water influencing ion behavior.