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Updated: Jul 15, 2026

Analysis of Effect of Compound Salt Stress on Seed Germination and Salt Tolerance Analysis of Pepper (Capsicum annuum L.)
Published on: November 30, 2022
[Biosynthesis of Capsaicinoids in Capsicum annuum L. var. annuum:]
1Institut für Pharmakognosie der Universität Wien, Austria.
Abstract:
The biosynthesis of the branched fatty acid moiety of Capsaicinoids was examined by radioisotopic technique. Labelled nordihydrocapsaicin (NDHC), homocapsaicin I (HC I) and homodihydrocapsaicin I (HDHC I) were isolated from CAPSICUM fruits which had been fed L-leucine-U- (14)C via cotton wicks inserted into the stems. After the administration of L-i-leucine-U- (14)C radioactivity could be detected in the HC II- and HDHC II-fractions. As L-valine serves as precursor of L-leucine, not only labelled capsaicin (C) and its dihydroderivative (DHC) resulted when L-valine-U- (14)C was fed, but also NDHC, HC I and HDHC I. The results demonstrate that valine, i-leucine and leucine are direct precursors of the respective even- and odd-numbered branched fatty acid moieties of the capsaicinoids.
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