Two new sesquiterpene lactones from Ceiba pentandra

Area of Science:

• Phytochemistry
• Natural Products Chemistry
• Pharmacognosy

Background:

• Ceiba pentandra (Bombacaceae) is a plant species known for its traditional medicinal uses.
• Sesquiterpene lactones are a class of natural products with diverse biological activities.
• Previous research has identified various compounds from Ceiba pentandra, but the exploration of its root bark constituents remains ongoing.

Purpose of the Study:

• To isolate and characterize new sesquiterpene lactones from the root bark of Ceiba pentandra.
• To evaluate the antimicrobial activity of the isolated compounds.
• To expand the knowledge of the chemical constituents of Ceiba pentandra.

Main Methods:

• Extraction of compounds from the root bark of Ceiba pentandra.
• Isolation and purification of sesquiterpene lactones using chromatographic techniques.
• Structure elucidation of the new compounds through comprehensive spectroscopic analyses (e.g., NMR, MS).
• Assessment of antimicrobial activity using standard bioassays.

Main Results:

• Two novel sesquiterpene lactones were successfully isolated and identified.
• The new compounds were characterized as 2,7-dimethoxy-5-isopropyl-3-methyl-8,1-naphthalene carbolactone and 2-hydroxy-5-isopropyl-7-methoxy-3-methyl-8,1-naphthalene carbolactone.
• These new compounds demonstrated moderate antimicrobial activity.
• Known compounds, 8-formyl-7-hydroxy-5-isopropyl-2-methoxy-3-methyl-1,4-naphthaquinone and 7-hydroxycadalene, were also identified.

Conclusions:

• The root bark of Ceiba pentandra is a source of novel sesquiterpene lactones with antimicrobial properties.
• The identified compounds contribute to the phytochemical understanding of the Ceiba genus.
• Further investigation into the medicinal potential of these sesquiterpene lactones is warranted.