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Enthalpy changes in the helix-coil transition of poly(γ-benzyl L-glutamate)

✍ Scribed by F. E. Karasz; J. M. O'Reilly

Publisher
Wiley (John Wiley & Sons)
Year
1967
Tongue
English
Weight
525 KB
Volume
5
Category
Article
ISSN
0006-3525

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✦ Synopsis

The helix-coil transition temperature Tc of poly(Y-benzy1 bglutamate) in binary solvent mixtures of dichloroacetic acid and l,bdichlorobutane, 1-chlorooctane, or 1chlorododecane have been measured. A treatment is presented with which the transition enthalpy can be calculated from the observed dependence of T, on solvent composition.

Results are compared with previously obtained calorimetric data. The nnderlying assumpt.ions of the calculation are discussed.

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Enthalpy change of the coil–helix transi
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By combining the heat of dilution of a poly (y-benzyl L-glutamate)-dichloroacetic acid-1,2-dichloroethane solution with the corresponding heat of mixing of two solvents, the integrated heat of the coil-helix transition of poly(y-benzyl L-glutamate) in the solution was estimated to be about 750 cal/m

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In this paper two points are considered: the methods of evaluating the helical content 8 and the calculation of the parameters of the transition from experimental data and its interpretation. The parameter AH obtained is in good agreement with the calorimetric one and v is found to be independent of

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## Abstract The thermal helix–coil transition of four samples of poly(γ‐benzyl‐L‐glutamate) in the dioxane–dichloroacetic acid (DCA) mixture was studied by optical rotatory dispersion method. The transition occurred at very high DCA content (97.5% by weight) in this system. The transition parameter

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## Abstract The coil to helix conformational transitions undergone by poly‐γ‐benzyl‐~L~‐glutamate in solutions of haloacetic acids and various cosolvents were studied by means of proton magnetic resonance. The results indicate a very small solvent dependence of the α‐CH Helix–coil chemical shift di