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
NMR and optical activity observations on the helix–coil transition in poly(γ-benzyl L-glutamate) solutions
✍ Scribed by Kang-Jen Liu; J. S. Lignowski; Robert Ullman
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1967
- Tongue
- English
- Weight
- 338 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0006-3525
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✦ Synopsis
The helix-coil transition of poly(ybenzy1 L-glutamate) was studied by comparing proton magnetic relaxation behavior with optical activity studies. The transition temperatnre as determined by magnetic relaxation was lower than that obtained by optical activity.
The relationship of these experiments with previous NMR studies and also with calorimetric investigation of the trsnsition is developed.
The concentration dependence of the transition was also studied.
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## Abstract The helix–coil conformational transition undergone by poly(γ‐benzyl‐L‐glutamate) in solutions of trifluoroacetic acid and deuterated chloroform was studied by proton and carbon‐13 nmr. The results indicate that in the case of the solvent‐induced helix–coil transition, the side chain ass
## 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
The effects of deuteration and of changes in solvent composition on the thermodynamics of the helix-coil transition have been studied by calorimetric and optical measurements in the poly-7-benzyl-Lglutamatedichloroacetic acid-l,%dichloroethane system. For a given solvent composition, deuteration of
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