Experimental thermodynamics of the helix-random coil transition. I. Influence of polymer concentration and solvent composition in the PBG-DCA-EDC system

Ackermann T, Neumann E (1967)
Biopolymers 5(7): 649-662.

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The course of the reversible helix formation of poly(y-benzyl L-glutamate) (PBG) dissolved in a mixture of dichloroacetic acid (DCA) and 1,2-dichloroethane (EDC) was followed by measuring the heat capacity and the optical rotation of the system through the transition region. The results of these measurements indicate that the transition enthalpy H the transition temperature Tc, and the Zimm-Bragg parameter depend considerably on the PBG concentration as well as on the composition of the solvent. For the standard state of infinite dilution, however, a linear extrapolation of the measured H if values results in a standard value H = 950 cal./mole, independent of the solvent composition. The results of the calorimetric measurements are discussed in relationship to changes in optical rotation. Some peculiarities in the measured thermodynamic and optical properties in solutions with relatively high content of dichloroacetic acid are reported.
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Ackermann T, Neumann E. Experimental thermodynamics of the helix-random coil transition. I. Influence of polymer concentration and solvent composition in the PBG-DCA-EDC system. Biopolymers. 1967;5(7):649-662.
Ackermann, T., & Neumann, E. (1967). Experimental thermodynamics of the helix-random coil transition. I. Influence of polymer concentration and solvent composition in the PBG-DCA-EDC system. Biopolymers, 5(7), 649-662.
Ackermann, T., and Neumann, E. (1967). Experimental thermodynamics of the helix-random coil transition. I. Influence of polymer concentration and solvent composition in the PBG-DCA-EDC system. Biopolymers 5, 649-662.
Ackermann, T., & Neumann, E., 1967. Experimental thermodynamics of the helix-random coil transition. I. Influence of polymer concentration and solvent composition in the PBG-DCA-EDC system. Biopolymers, 5(7), p 649-662.
T. Ackermann and E. Neumann, “Experimental thermodynamics of the helix-random coil transition. I. Influence of polymer concentration and solvent composition in the PBG-DCA-EDC system”, Biopolymers, vol. 5, 1967, pp. 649-662.
Ackermann, T., Neumann, E.: Experimental thermodynamics of the helix-random coil transition. I. Influence of polymer concentration and solvent composition in the PBG-DCA-EDC system. Biopolymers. 5, 649-662 (1967).
Ackermann, Theodor, and Neumann, Eberhard. “Experimental thermodynamics of the helix-random coil transition. I. Influence of polymer concentration and solvent composition in the PBG-DCA-EDC system”. Biopolymers 5.7 (1967): 649-662.
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16 Citations in Europe PMC

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Heat capacity increments: conformational transitions in polypeptides.
Couchman PR, Gajnos GE, Ryan CL Jr, Karasz FE., Biopolymers 22(11), 1983
PMID: 6652224
Helix-coil transition of poly(gamma-benzyl-l-glutamate) in the dioxane-dichloracetic acid mixture.
Gupta AK, Dufour C, Marchal E, Benoit H., Biopolymers 14(3), 1975
PMID: 1174684
Microcalorimetric investigation of dilute and concentrated solutions and films of the polydeoxynucleotide poly(d(A-T)-d(A-T)).
Andronikashvili EL, Mgeladze GN, Monaselidze JR, Lezius AG., Biopolymers 13(9), 1974
PMID: 4414668
Enthalpies of helic-coil transitions in polypeptides.
Karasz FE, Gajnos GE., Biopolymers 13(4), 1974
PMID: 4847583
Cooperative conformational transitions of linear biopolymers.
Engel J, Schwarz G., Angew. Chem. Int. Ed. Engl. 9(6), 1970
PMID: 4988013

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