Abstract
IN a previous communication1 I mentioned the dimensions of a unit cell of native starch in the B-modification as deduced from a fibre pattern obtained from a part of a single starch grain. It has now become evident, from consideration of the reciprocal lattice and reflexion globe, that the unexplained difference, noted in that communication, between the fibre period calculated from the pattern and the supposed true period, is a phenomenon that may be expected and that can be explained from bad parallelism between the micelles, especially from those directions of the micelle long axes which deviate from perpendicularity to the incident beam. Further-more, a critical revision of the d-values derived from a powder pattern of native starch in the B-modification has shown that a fibre period of 10.5–10.6 A. is in somewhat better agreement with these spacings than the period of 10.4 A. previously given.
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References
Kreger, D., Nature, 153, 199 (1946).
Astbury, W. T., Nature, 155, 667 (1945).
Meyer, K. H., "Natural and Synthetic High Polymers" (New York, 1942), 393.
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KREGER, D. Configuration and Packing of Chain Molecules of Native Starch in the B-Modification. Nature 160, 369 (1947). https://doi.org/10.1038/160369a0
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DOI: https://doi.org/10.1038/160369a0
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