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Enthalpy of helix–coil transitions from heats of solution. I. Polyglutamates.

✍ Scribed by Giovanni Giacometti; Angelo Turolla; Renzo Boni

Publisher
Wiley (John Wiley & Sons)
Year
1968
Tongue
English
Weight
361 KB
Volume
6
Category
Article
ISSN
0006-3525

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✦ Synopsis

The heat of solution of a series of three polyglutamntes as a function of solvent composition was measured. The abrupt increase in heat of solution a t the solvent composition of the helix-coil transition (as evidenced by optical rotation data) allows the estimation of the transition enthalpy change. The difference of side chain in the three polyglutamates has no appreciable effect on the transition enthalpy, although it affects the helix stability, as judged from the solvent composition at the transition points. These facts are discussed on the basis of existing models of the transition.

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