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Updated: Jul 5, 2026

A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products

A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products

Published on: October 4, 2019

ent-Kaurane diterpenoids from Isodon japonicus.

Seong Su Hong¹, Seon A Lee, Xiang Hua Han

¹College of Pharmacy, Chungbuk National University, Cheongju 361-763, Korea.

Journal of Natural Products

|May 22, 2008

Summary

This study isolated 15 ent-kaurane diterpenoids from Isodon japonicus, evaluating their potential to inhibit nitric oxide production in immune cells.

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Area of Science:

Natural Products Chemistry
Pharmacology
Immunology

Background:

Isodon japonicus is a plant source of bioactive compounds.
Ent-kaurane diterpenoids are a class of natural products with diverse biological activities.
Nitric oxide (NO) plays a crucial role in inflammatory processes.

Purpose of the Study:

To isolate and characterize ent-kaurane diterpenoids from Isodon japonicus.
To evaluate the inhibitory effects of these compounds on nitric oxide production in macrophages.

Main Methods:

Isolation of compounds using chromatographic techniques.
Structure elucidation using spectroscopic methods (NMR, MS).
In vitro assay for nitric oxide inhibition in lipopolysaccharide (LPS)-stimulated RAW264.7 cells.

Main Results:

Five new ent-kaurane diterpenoids (1-5) were identified, along with 10 known compounds (6-15).
The structures were confirmed through comprehensive spectroscopic and chemical analyses.
The isolated diterpenoids were tested for their ability to suppress LPS-induced nitric oxide production.

Conclusions:

Isodon japonicus yields a rich variety of ent-kaurane diterpenoids.
These compounds represent potential therapeutic agents for inflammatory conditions by modulating nitric oxide synthesis.