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Cyclic octapeptides from Stellaria dichotoma var. lanceolata
H Morita1, K Takeya, H Itokawa
1Department of Pharmacognosy, School of Pharmacy, Tokyo University of Pharmacy and Life Science, Japan.
Phytochemistry
|June 1, 1997
Summary
Two novel cyclic octapeptides, dichotomin H and dichotomin I, were identified in Stellaria dichotoma roots. Their structures were determined using advanced NMR techniques and chemical analysis.
Area of Science:
- Natural Product Chemistry
- Organic Chemistry
- Pharmacognosy
Background:
- Stellaria dichotoma is a plant species with potential medicinal properties.
- Cyclic octapeptides are a class of compounds with diverse biological activities.
- Previous research may not have fully characterized the chemical constituents of Stellaria dichotoma roots.
Purpose of the Study:
- To isolate and characterize new cyclic octapeptides from the roots of Stellaria dichotoma L. var lanceolata Bge.
- To elucidate the structures of the newly discovered compounds using spectroscopic and chemical methods.
Main Methods:
- Isolation of compounds using chromatographic techniques.
- Structure elucidation employing extensive two-dimensional Nuclear Magnetic Resonance (2D-NMR) spectroscopy.
- Confirmation of structures through chemical degradation studies.
Main Results:
- Two new cyclic octapeptides, named dichotomin H (cyclo(-Ala-Pro-Thr-Phe-Tyr-Pro-Leu-Ile-)) and dichotomin I (cyclo(-Val-Pro-Thr-Phe-Tyr-Pro-Leu-Ile-)), were successfully isolated.
- The complete structures of dichotomin H and dichotomin I were determined via 2D-NMR and chemical degradation.
Conclusions:
- The chemical investigation of Stellaria dichotoma roots has led to the discovery of two novel cyclic octapeptides.
- The findings contribute to the understanding of the phytochemical profile of Stellaria dichotoma and the diversity of cyclic octapeptides.