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Thermodynamic Parameters of Biopolymer-Water Systems

  • Madeleine Lüscher-Mattli

Abstract

It has been recognized that biopolymer-associated water plays an important role in the folding and reactivity of native biopolymers. There is, however, a lack of understanding of the basis of this solvent control of biochemical reactivity. Investigation of the energetics of biopolymer hydration processes thus seems to be essential to improve our understanding of the biological (and possibly pathological) functions of water.

Keywords

Specific Volume Water Sorption Hydration Water Partial Specific Volume Critical Water Content 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Symbols

P/PO

equilibrium relative water vapor pressure at a given experimental temperature T and constant (isosteric) water content h (g H2O/g biopolymer) or n (mol H2O g -1biopolymer)

h

water content (g H2O g-1biopolymer)

h*

critical water content (g H2Og-1 biopolymer) (“monolayer” content)

v

experimentally determined specific volume, [cm3 g-1]; (v=l-1 density)

\(\bar{\rm v}_1^0\)

partial specific volume of pure liquid water

\(\bar{\rm v}_1\)

partial specific volume of component 1

\(\bar{\rm v}_2\)

partial specific volume of component 2

\(\Delta \bar{\rm v}_2\)

difference in partial specific volume of component 2, v2, obtained by extrapolation of v versus W I functions to WI = 0, and v 2 obtained experimentally at WI =0

vφ,i

apparent specific volume of component i

Wi

weight fraction of component i

\(\Delta_{\rm a}\rm G_i^0, \Delta_{\rm a}\rm H_i^0, \Delta_{\rm a}\rm S_i^0\)

standard isosteric molar Gibbs energies, enthalpies and entropies of sorption

\(\Delta_{\rm a}\rm G_m^0, \Delta_{\rm a}\rm H_m^0, \Delta_{\rm a}\rm S_m^0\)

standard integral molar Gibbs energies, enthalpies and entropies of sorption

ΔHv

enthalpy of vaporization of pure water at 298.15K

ΔfH

enthalpy of water fusion

Tf

temperature of water fusion

ΔwHo

standard enthalpies of wetting

\(\Delta_{\rm a}\rm H_{cal}^0\)

calorimetrically obtained molar enthalpies of water sorption (or desorption)

Δa Had

adiabatic molar enthalpies of water sorption

Cp

experimentally observed specific heat capacity

\(\bar{\rm c}_{\rm p,1}\)

partial specific heat capacity of component 1

\(\bar{\rm c}_{\rm p,2}\)

partial specific heat capacity of component 2

φCp,2

apparent specific heat capacity of the biopolymer

\(\bar{\rm c}_{\rm p}^0\)

partial specific heat capacity of the pure liquid water

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Copyright information

© Springer-Verlag Berlin Heidelberg 1986

Authors and Affiliations

  • Madeleine Lüscher-Mattli

There are no affiliations available

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