A study on the isothermal kinetics of helix-helix transformation poly(beta-phenylpropyl L-aspartate) solid by DSC analysis

Authors
Sakajiri, K Satoh, K Yoshioka, K Kawauchi, S Watanabe, J
Citation
K. Sakajiri et al., A study on the isothermal kinetics of helix-helix transformation poly(beta-phenylpropyl L-aspartate) solid by DSC analysis, J MOL STRUC, 477(1-3), 1999, pp. 175-179
Citations number
16
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF MOLECULAR STRUCTURE
ISSN journal
00222860 → ACNP
Volume
477
Issue
1-3
Year of publication
1999
Pages
175 - 179
Database
ISI
SICI code
0022-2860(19990316)477:1-3<175:ASOTIK>2.0.ZU;2-V
Abstract
It is known that poly(beta-phenylpropyl L-aspartate) (3PLA) exhibits the re versible transformation from the right-handed alpha-helix to the left-hande d omega-helix in the solid state. In this study, the isothermal kinetics of this helix-helix transformation were examined for 3PLA mixed with poly(gam ma-phenethyl D-glutamate) by the DSC method. The isothermal transformation took place within several minutes and was analyzed according to the Avrami equation. The isotherms correspond to an Avrami exponent n = 2.3-2.4, showi ng that the helix-helix transformation is nearly a type of homogeneous nucl eation and one-dimensional growth. (C) 1999 Elsevier Science B.V. All right s reserved.