Abstract
Hulme1 and Urbach2 independently isolated a new amino-acid from apples, and the isomeric structures I2 and II1,3 were proposed for these substances on the basis of elemental analysis, colour reactions and chromatographic properties1–3. The infra-red spectra of these compounds proved to be superimposable, and this indicated that the compounds were identical, but it did not permit a decision between the alternative structures3.
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References
Hulme, A. C., Nature, 174, 1055 (1954).
Urbach, G., Nature, 175, 170 (1955).
Hulme, A. C., and Steward, F. C., Nature, 175, 171 (1955).
Biemann, K., Seibl, J., and Gapp, F., Biochem. Biophys. Res. Comm., 1, 307 (1959).
Biemann, K., Lioret, C., Asselineau, J., Lederer, E., and Polonsky, J., Biochim. Biophys. Acta, 40, 369 (1960).
Biemann, K., and Vetter, W., Biochem. Biophys. Res. Comm., 2, 93 (1960).
Burroughs, L. F., Dalby, S., Kenner, G. W., and Sheppard, R. C., Nature, 189, 394 (1961).
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BIEMANN, K., DEFFNER, G. & STEWARD, F. Determination by Mass Spectrometry of the Structure of Proline Derivatives from Apples. Nature 191, 380–381 (1961). https://doi.org/10.1038/191380b0
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DOI: https://doi.org/10.1038/191380b0
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