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Bioactive A-type proanthocyanidins from Cinnamomum cassia
K Brian Killday1, Matthew H Davey, Jan A Glinski
1Bruker Biospin Corporation, Billerica, Massachusetts 01821, United States.
Journal of Natural Products
|August 31, 2011
Summary
Two trimeric proanthocyanidins, cinnamtannin B-1 and cinnamtannin D-1, were isolated from Cinnamomum cassia bark. These compounds, along with two tetramers, showed significant cyclooxygenase-2 (COX-2) inhibitory activity in vitro.
Area of Science:
- Natural Product Chemistry
- Pharmacology
Background:
- Cinnamomum cassia bark is a source of bioactive compounds.
- Proanthocyanidins are a class of polyphenols with diverse biological activities.
Purpose of the Study:
- To isolate and characterize proanthocyanidins from Cinnamomum cassia bark.
- To evaluate the in vitro inhibitory activity of isolated proanthocyanidins against cyclooxygenase-2 (COX-2).
Main Methods:
- Isolation of compounds using chromatographic techniques.
- Structure elucidation using 1D and 2D NMR, Mass Spectrometry (MS), and Circular Dichroism (CD) analyses.
- In vitro COX-2 inhibition assays.
Main Results:
- Four proanthocyanidins were isolated: cinnamtannin B-1 (trimer), cinnamtannin D-1 (trimer), parameritannin A-1 (tetramer), and cassiatannin A (tetramer).
- The structures of the isolated compounds were confirmed through spectroscopic analyses.
- All four proanthocyanidins (1-4) exhibited significant in vitro inhibitory activity against COX-2 at micromolar concentrations.
Conclusions:
- Cinnamomum cassia bark contains novel and known proanthocyanidins.
- These isolated proanthocyanidins demonstrate potential as COX-2 inhibitors.
- Further research into the therapeutic applications of these compounds is warranted.
