Letter | Published:

Crystal Structure of B-Starch from X-Ray Fibre Diagrams

Nature volume 162, page 107 (17 July 1948) | Download Citation



IN recent papers1, Kreger has published fibre data from the B(tuber)-modification of starch. Though his technique is new and interesting, Kreger‘s results mainly confirm data which were published some years ago2. Apparently the earlier fibre diagrams were more highly orientated than Kreger‘s, since the fibre spacing (10·6 ± 0·1 kX.) could be obtained unambiguously from these diagrams. More recently, both B and A (cereal-type) fibres have been prepared by new techniques with truly extraordinary orientations3. The fibre spacing of the A-modification (10·5 kX.) is substantially equal to that of the B-modification, a result not unexpected, since Bear and, French established a very close relationship between these modifications of starch4.

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  1. 1.

    , Nature, 158, 199 (1946); 160, 369 (1947).

  2. 2.

    , and , J. Amer. Chem. Soc., 66, 130 (1944). For a report of the first X-ray fibre diagrams from starch, see and , ibid., 65, 2261 (1943).

  3. 3.

    and , J. Amer. Chem. Soc., 68, 2408 (1946).

  4. 4.

    and , J. Amer. Chem. Soc., 63, 2298 (1941).

  5. 5.

    and , Ind. Eng. Chem., Anal. Ed., 14, 843 (1942). See also , "Starch and Its Derivatives", 46 (second ed., Chapman and Hall, London, 1943).

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  1. Department of Chemistry, Iowa State College, Ames, Iowa. March 11.

    • R. E. RUNDLE


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