𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Helix–coil transition of poly(γ-benzyl-L-glutamate) in the dioxane–dichloroacetic acid mixture

✍ Scribed by A. K. Gupta; C. Dufour; E. Marchal; H. Benoit

Publisher
Wiley (John Wiley & Sons)
Year
1975
Tongue
English
Weight
367 KB
Volume
14
Category
Article
ISSN
0006-3525

No coin nor oath required. For personal study only.

✦ Synopsis

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 parameters have been evaluated by two methods based on the theories of Zimm and Bragg and of Nagai. The values of the helix initiation parameter and of the enthalpy of transition were found to be (4.4 ± 0.4) × 10^−5^ and 340 cal/mole, respectively. The range of validity and equivalence of the two methods is discussed.

📜 SIMILAR VOLUMES

Enthalpy change of the coil–helix transi
Enthalpy change of the coil–helix transition of poly(γ-benzyl L-glutamate) in dichloroacetic acid–1,2-dichloroethane mixtures
✍ Akihiro Kagemoto; Ryoichi Fujishiro 📂 Article 📅 1968 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 254 KB 👁 1 views

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

Helix–coil transition in copolypeptides.
Helix–coil transition in copolypeptides. I. Poly (γ-benzyl-co-γ-methyl L-glutamate)
✍ A. Roig; M. Cortijo 📂 Article 📅 1971 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 361 KB 👁 1 views

## Abstract The helix–coil transition in poly(γ‐benzyl L‐glutamate‐__co__‐γ‐methyl L‐glutamate) copolypeptides was studied experimentally in nonaqueous solvents and the results compared with theory. It is found that the transition can be described by the same theory as for the homopolypeptides, but

Helix–coil transition in poly(γ-benzyl-L
Helix–coil transition in poly(γ-benzyl-L-glutamate) and poly-ε-carbobenzoxy-L-lysine
✍ M. Cortijo; A. Roig; F. Garcia Blanco 📂 Article 📅 1969 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 440 KB 👁 1 views

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

Solvent dependence of the helix–coil tra
Solvent dependence of the helix–coil transition of poly-γ-benzyl-L-glutamate. A PMR study
✍ Luciano Ferrara; Piero A. Temussi 📂 Article 📅 1973 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 395 KB 👁 1 views

## 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

Helix–coil transition in copolypeptides.
Helix–coil transition in copolypeptides. II. Poly(γ-benzyl L-glutamate-co-ε-carbobenzoxy-L-lysine)
✍ A. Roig; F. García Blanco; M. Cortijo 📂 Article 📅 1971 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 353 KB

## Abstract The thermal helix–coil transition of poly(γ‐benzyl L‐glutamate‐__co__‐ε‐carbobenzoxy‐L‐lysine) copolypeptides was studied in solvent mixtures of different compositions. The cooperativity parameter __v__ changes linearly with polymer (and solvent) composition, whereas the heat of the tra

Carbon-13 and proton nmr studies of heli
Carbon-13 and proton nmr studies of helix–coil transition of poly(γ-benzyl-L-glutamate)
✍ Yasuyuki Suzuki; Yoshio Inoue; Riichirô Chûjô 📂 Article 📅 1975 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 358 KB

## 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