Abstract
NEARLY twenty years ago, Meyer and Go1 described the X-ray diffraction powder photograph of some glycine peptides, and found that different photographs were obtained from polyglycine according to the method of preparation. When the polymer was made by decomposition of the N-carboxy glycine anhydride in the presence of pyridine, reflexions corresponding to 4.4 A. and 3.45 A. were observed ; but the same polymer precipitated by water from aqueous lithium bromide solution gave a photograph in which a reflexion at 4.15 A. was predominant. Subsequent observations2.4 have related to the first form, which may be produced by casting from solution in dichloracetic acid or in trifluoracetic acid. It will be convenient to refer to this form as polyglycine I, and to the form characterized by the 4.15-A. reflexion as polyglycine II.
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BAMFORD, C., BROWN, L., CANT, E. et al. Structure of Polyglycine. Nature 176, 396–397 (1955). https://doi.org/10.1038/176396a0
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DOI: https://doi.org/10.1038/176396a0
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