Amino Acids and gamma-Glutamyl Derivatives in Seeds of Lunaria annua L. Part II.

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Abstract
In continuation of studies on the contents of ninhydrin-reacting constituents in unhydrolyzed seed extracts of Lunaria annua L., N5-isopropyl-L-glutamine, not previously found in nature, and gamma-glutamyl-gamma-aminobutyric acid, previously only tentatively identified in nature, have been isolated and identified by comparison with synthetic samples prepared by conventional methods. [alpha]-Aminoadipic acid, [beta]-alanine ([long dash])-[beta]-aminoisobutyric acid, gamma -aminobutyric acid, and gamma-guanidobutyric acid, all previously known from higher plants, have been isolated in crystalline form. The structure of a new amino acid and two sulphur-containing derivatives of glutamic acid remain to be elucidated.
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