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Determination by Mass Spectrometry of the Structure of Proline Derivatives from Apples

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

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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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