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Heat capacity and vibrational dynamics of α poly(β-benzyl-L-aspartate)

✍ Scribed by Poonam Tandon; V. D. Gupta; O. Prasad; Shantanu Rastogi; S. B. Katti

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 959 KB
Volume: 34
Category: Article
ISSN: 0887-6266
DOI: 10.1002/(sici)1099-0488(199605)34:7<1213::aid-polb4>3.0.co;2-w

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✦ Synopsis

Poly(P-benzyl-L-aspartate) (PBLA) is an unusual polypeptide, which is capable of going into four different conformations, namely, left-handed a helix, right-handed a helix, o helix, and fi pleated sheet. The present work is a complete study of normal modes and their dispersion in the unusual left-handed a form. A special feature of some of the dispersion curves is their tendency to bunch in the neighborhood of helix angle. This is attributed to the presence of strong intramolecular interactions. Crossing and repulsion between the dispersion curves is also observed. The N-deuterated analogue of PBLA has been studied to check the validity of assignments and force field (Urey Bradley). Specific heat has been obtained from dispersion curves via density of states. A comparative study of left-handed and right-handed forms is presented.

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