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A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products
Published on: October 4, 2019
neo-Clerodane diterpenoids from Ajuga bracteosa
Amaya Castro1, Josep Coll, Mohammad Arfan
1Departament de Química Biològica i Modelització Molecular, Institut de Química Avançada de Catalunya, Consejo Superior de Investigaciones Científicas, Jordi Girona 18-26, 08034 Barcelona, Spain.
Journal of Natural Products
|May 5, 2011
Summary
Researchers isolated various neo-clerodane diterpenoids from Ajuga bracteosa, with compound types varying based on purification methods. Antifeedant activity against Spodoptera littoralis larvae was also assessed for these natural products.
Area of Science:
- Natural Product Chemistry
- Phytochemistry
- Organic Chemistry
Background:
- Ajuga bracteosa is a plant source of diverse neo-clerodane diterpenoids.
- These compounds, particularly tetrahydrofurofuran derivatives, are known for their chemical lability.
- Isolation strategies significantly influence the types of diterpenoids obtained.
Purpose of the Study:
- To isolate and characterize neo-clerodane diterpenoids from Ajuga bracteosa.
- To investigate the impact of different purification methods on the isolation of labile diterpenoids.
- To evaluate the antifeedant activity of the isolated compounds against Spodoptera littoralis larvae.
Main Methods:
- Extraction of Ajuga bracteosa using dichloromethane.
- Purification using "hydroxyl-free" conditions and C18 reversed-phase chromatography.
- Separation via semipreparative High-Performance Liquid Chromatography (HPLC).
- Structure elucidation using Nuclear Magnetic Resonance (NMR) and Mass Spectrometry (MS) data.
Main Results:
- Isolation of four new compounds, ajubractins A-D, and eleven known neo-clerodane diterpenoids under "hydroxyl-free" conditions.
- Isolation of a new compound, ajubractin E, and several known compounds when using methanol-water mixtures for purification.
- Obtention of epimeric mixtures of certain hydroxy-clerodane derivatives.
- Identification of ajubractins A-E, clerodin, 3-epi-caryoptin, ajugapitin, 14,15-dihydroclerodin, 3-epi-14,15-dihydrocaryoptin, ivain II, 14,15-dihydroajugapitin, 15-hydroxyajubractin C, 14-hydro-15-hydroxyajugachin A, 14-hydro-15-hydroxyajugapitin, and 15-epi-lupulin B.
- Demonstration of antifeedant activity of the isolated compounds against Spodoptera littoralis larvae.
Conclusions:
- The isolation of neo-clerodane diterpenoids from Ajuga bracteosa is highly dependent on the purification methodology due to compound lability.
- New compounds, ajubractins A-E, were successfully identified and characterized.
- The study provides insights into the chemical diversity of Ajuga bracteosa diterpenoids and their potential bioactivity.
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