Flavonoids from Stellaria nemorum and Stellaria holostea

Area of Science:

• Phytochemistry
• Natural Products Chemistry
• Pharmacognosy

Background:

• Stellaria nemorum and S. holostea (Caryophyllaceae) are plant species with potential medicinal properties.
• Flavonoids are a diverse group of plant secondary metabolites known for various biological activities.

Purpose of the Study:

• To isolate and characterize flavonoids from the aerial parts of Stellaria nemorum and S. holostea.
• To evaluate the antimicrobial activity of the crude extracts and isolated compounds.

Main Methods:

• Isolation of compounds using chromatographic techniques.
• Structure elucidation using spectroscopic methods (NMR, MS) and chemical analysis (acid hydrolysis).
• Antimicrobial activity testing against Staphylococcus aureus.

Main Results:

• A new flavonoid, 6-C-[(α-arabinopyranosyl)-(1-->2)-O-β-xylopyranosyl]apigenin, and four known C-glycosides were isolated from S. nemorum.
• Five known flavonoids, including diosmetin 6-C-β-glucopyranoside and schaftoside, were isolated from S. holostea.
• Crude extracts demonstrated antimicrobial activity against Staphylococcus aureus; however, none of the isolated pure compounds showed activity.

Conclusions:

• The study successfully identified novel and known flavonoids from the investigated Stellaria species.
• The antimicrobial activity observed in crude extracts suggests the presence of other active principles or synergistic effects.
• Further research is needed to identify the specific compounds responsible for the crude extract's activity.