[Chemical constitutes from Clerodendrum japonicum]

Area of Science:

• Phytochemistry
• Natural Product Chemistry
• Organic Chemistry

Background:

• Clerodendrum japonicum is a plant species with potential medicinal properties.
• The chemical diversity of Clerodendrum species is of interest for discovering new bioactive compounds.

Purpose of the Study:

• To isolate and identify chemical constituents from the ethanol extract of Clerodendrum japonicum.
• To characterize novel natural products from this plant source.

Main Methods:

• Extraction of Clerodendrum japonicum using ethanol.
• Isolation of compounds using column chromatography (silica gel, Sephadex LH-20, ODS) and reversed-phase High-Performance Liquid Chromatography (HPLC).
• Structure elucidation using physicochemical properties and modern spectral analysis techniques.

Main Results:

• Sixteen compounds were isolated and identified, including two new natural products: 7α-hydroxy syringaresinol (1) and (2R)-butylitaconic acid (15).
• Compounds 1 and 15 are reported as new natural products.
• Most of the other identified compounds were isolated from Clerodendrum japonicum for the first time, with the exception of compounds 4, 6, and 7.

Conclusions:

• The study successfully identified a range of chemical constituents from Clerodendrum japonicum.
• The discovery of new natural products contributes to the phytochemical knowledge of the Clerodendrum genus.
• This research provides a basis for further investigation into the biological activities of these isolated compounds.