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

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Published on: October 4, 2019

Bioactive terpenoid constituents from Eclipta prostrata.

Shu-Juan Yu¹, Jin-Hai Yu², Zhi-Pu Yu¹

¹School of Chemistry and Chemical Engineering, University of Jinan, 336 West Road of Nan Xinzhuang, Jinan 250022, China; School of Biological Science and Technology, University of Jinan, 336 West Road of Nan Xinzhuang, Jinan 250022, China.

|November 15, 2019

Summary

This summary is machine-generated.

Researchers isolated novel terpenoids from Eclipta prostrata, including a rare tetracyclic triterpenoid. This compound demonstrated potent α-glucosidase inhibition, significantly outperforming the control drug acarbose.

Keywords:

Antibacterial Compositae Cytotoxicity Eclipta prostrata Terpenoid α-glucosidase

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Area of Science:

Natural Product Chemistry
Phytochemistry
Medicinal Chemistry

Background:

Eclipta prostrata is a medicinal plant with a history of traditional use.
Terpenoids are a diverse class of natural products with a wide range of biological activities.
Identifying novel bioactive compounds from natural sources is crucial for drug discovery.

Purpose of the Study:

To isolate and characterize new terpenoid constituents from Eclipta prostrata.
To evaluate the biological activities of the isolated compounds, including antibacterial, cytotoxic, and α-glucosidase inhibitory effects.
To identify potential therapeutic agents for metabolic disorders and infectious diseases.

Main Methods:

Ethanolic extraction and chemical fractionation of Eclipta prostrata.
Structure elucidation using comprehensive spectroscopic analyses (NMR, MS, etc.).
Determination of absolute configurations via electronic circular dichroism (ECD) data.
In vitro bioassays for antibacterial, cytotoxic, and α-glucosidase inhibitory activities.

Main Results:

Isolation and characterization of six unreported terpenoids: a rare tetracyclic triterpenoid, a pentacyclic triterpenoid, two pentacyclic triterpenoid saponins, a diterpenoid, and a sesquiterpenoid.
The tetracyclic triterpenoid exhibited potent α-glucosidase inhibitory activity (IC50 = 0.82 ± 0.18 μM), which is approximately 1000-fold more active than acarbose.
Selective antibacterial and cytotoxic activities were observed for other isolated compounds.

Conclusions:

Eclipta prostrata is a rich source of structurally diverse and biologically active terpenoids.
The novel tetracyclic triterpenoid represents a promising lead compound for the development of new α-glucosidase inhibitors for managing type 2 diabetes.
Further investigation into the pharmacological properties and mechanisms of action of these compounds is warranted.