Abstract
THE synthesis and some of the properties of poly-L-proline were described recently1. A sample with an average degree of polymerization n = 67 which was obtained by bulk polymerization, dissolved in glacial acetic acid and precipitated with ether, gave the following specific rotations: [α]20 D −483° (c. 1.5 in formic acid), [α]20 D −372° (c. 2.0 in glacial acetic acid) and [α]20 D −353° (c. 2.0 in water). As will be shown however, the optical rotation of a solution of poly-L-proline depends both on the history of the sample and on the manner in which the solution was prepared.
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References
Berger, A., Kurtz, J., and Katchalski, E., J. Amer. Chem. Soc., 76, 5552 (1954).
Cowan, P. M., and McGavin, S., Nature, 176, 501 (1955).
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KURTZ, J., BERGER, A. & KATCHALSKI, E. Mutarotation of Poly-L-proline. Nature 178, 1066–1067 (1956). https://doi.org/10.1038/1781066a0
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DOI: https://doi.org/10.1038/1781066a0
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