Brahmachari, Samir K. ; Bansal, Manju ; Ananthanarayanan, V. S. ; Sasisekharan, V. (1979) Structural investigations on poly(4-hydroxy-L-proline). 2. Physicochemical studies Macromolecules, 12 (1). pp. 23-28. ISSN 0024-9297
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Official URL: http://pubs.acs.org/doi/abs/10.1021/ma60067a006
Related URL: http://dx.doi.org/10.1021/ma60067a006
Abstract
We report experimental studies which confirm our prediction, namely that the ordered structure of poly(hydroxypro1ine) in solution corresponds to a left-handed helical structure with intrachain hydrogen bonds. The CD studies show that the poly(hydroxypro1ine) molecule has essentially the same conformation in aqueous solution and in the film obtained subsequently by evaporation. X-ray diffraction patterns of the sample in this form (B form) have been recorded at different relative humidities. The patterns recorded at relative humidities over 66% can be interpreted in terms of a helical structure with intrachain hydrogen bonds. These results lead us to conclude that the ordered conformation of poly(hydroxypro1ine) in solution is form B and not form A. This offers a simple explanation for the greater stability of the poly(hydroxypro1ine) helix in solution as compared to the poly(pro1ine) form I1 helix and also for the absence of mutarotation for poly(hydroxypro1ine).
Item Type: | Article |
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Source: | Copyright of this article belongs to American Chemical Society. |
ID Code: | 48005 |
Deposited On: | 13 Jul 2011 14:12 |
Last Modified: | 13 Jul 2012 08:41 |
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