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Polyelectrolytic aspects of the thermodynamics of conformational transition: κ‐carrageenan in formamide
Author(s) -
Benegas Julio C.,
Pantano Sergio,
Vetere Amedeo,
Paoletti Sergio
Publication year - 1999
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/(sici)1097-0282(199902)49:2<127::aid-bip2>3.0.co;2-i
Subject(s) - chemistry , formamide , enthalpy , aqueous solution , intramolecular force , thermodynamics , solvent , entropy (arrow of time) , salt (chemistry) , computational chemistry , organic chemistry , physics
A recently published method for the determination of the enthalpy and entropy changes of nonionic origin upon conformational transition of linear biopolyelectrolytes in solution [J. C. Benegas, A. Cesàro, R. Rizzo and S. Paoletti (1998) Biopolymers, Vol. 45, pp. 203–216] has been extended from the case of aqueous salt solutions to that of the organic solvent formamide (FA). The calculation have been applied to the case of the intramolecular transition of the K + salt form of the sulfated polysaccharide κ‐carrageenan. The method proved to be effective in providing the desired data in FA, as it has been previously been successful for the water cases. The comparison between the predicted enthalpy change of transition and the microcalorimetric experimental one turned out to be excellent, thereby ensuring on the validity of the approach. © 1999 John Wiley & Sons, Inc. Biopoly 49: 127–130, 1999