Raman spectral evidence for hydration forces between collagen triple helices.
basic_science · Level V
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- Record sourced from PubMed, PMID 9326606.
- Also identified by PMC identifier 23454.
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Abstract
Hydration forces are thought to result from the energetic cost of water rearrangement near macromolecular surfaces. Raman spectra, collected on the same collagen samples on which these forces were measured, reveal a continuous change in water hydrogen-bonding structure as a function of separation between collagen triple helices. The varying spectral parameters track the force-distance curve. The energetic cost of water "restructuring," estimated from the spectra, is consistent with the measured energy of intermolecular interaction. These correlations support the idea that the change in water structure underlies the exponentially varying forces seen in this system at least over the 13-18-A range of interaxial separations.
Medical subject headings
- Collagen