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Three new bibenzyl derivatives from Dendrobium candidum
Yan Li1, Chun-Lan Wang, Ya-Jun Wang
1Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, P.R. China.
Chemical & Pharmaceutical Bulletin
|February 3, 2009
Summary
Three new bibenzyl compounds from Dendrobium candidum stems show significant antioxidant properties. Compound 3 demonstrated the strongest radical scavenging activity, outperforming Vitamin C in DPPH tests.
Area of Science:
- Natural Product Chemistry
- Pharmacognosy
- Medicinal Chemistry
Background:
- Dendrobium candidum is a traditional medicinal herb.
- Bibenzyl compounds are known for their diverse biological activities.
Purpose of the Study:
- To isolate and characterize new bibenzyl compounds from Dendrobium candidum stems.
- To evaluate the antioxidant potential of the isolated compounds.
Main Methods:
- Isolation of compounds using chromatographic techniques.
- Structure elucidation using 1D- and 2D-NMR spectroscopy and mass spectrometry.
- Antioxidant activity assessment via the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay.
Main Results:
- Three new bibenzyl compounds, dendrocandin C (1), dendrocandin D (2), and dendrocandin E (3), were identified.
- Compound 3 exhibited the most potent antioxidant activity with an IC(50) of 15.6 microM.
- Compounds 1 and 2 also displayed significant antioxidant activity (IC(50)s of 34.2 and 34.5 microM, respectively).
- Vitamin C as a positive control had an IC(50) of 23.2 microM.
Conclusions:
- The isolated bibenzyl compounds from Dendrobium candidum possess notable antioxidant capabilities.
- Dendrocandin E is a promising candidate for further investigation as a natural antioxidant agent.
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