Necrodane monoterpenoids from Lavandula luisieri.

Area of Science:

• Phytochemistry
• Natural Products Chemistry
• Microbiology

Background:

• Lavandula luisieri (L. luisieri) is a plant endemic to the Iberian Peninsula.
• Essential oils from plants are a rich source of bioactive compounds.
• Understanding the chemical composition and bioactivity of endemic species is crucial for discovering new natural products.

Purpose of the Study:

• To identify and characterize new irregular monoterpenoids from the essential oil of L. luisieri.
• To evaluate the antimicrobial activity of L. luisieri essential oil and its extract.

Main Methods:

• Isolation and identification of compounds using spectroscopic methods (e.g., NMR, MS).
• Chemical characterization of the identified monoterpenoids.
• Antimicrobial susceptibility testing against selected microorganisms (Candida albicans, Staphylococcus aureus, S. epidermidis, S. pyogenes).

Main Results:

• Four novel irregular monoterpenoids were identified: 3,5-dimethylene-1,4,4-trimethylcyclopentene, 5-methylene-2,3,4,4-tetramethylcyclopent-2-enone, 3,4,5,5-tetramethylcyclopenta-1,3-dienecarboxaldehyde, and 3,4,5,5-tetramethylcyclopenta-1,3-dienecarboxylic acid.
• The essential oil and extract of L. luisieri exhibited notable activity against Candida albicans.
• Significant inhibitory effects were observed against gram-positive bacteria, including Staphylococcus aureus, S. epidermidis, and S. pyogenes.

Conclusions:

• The essential oil of L. luisieri is a source of unique irregular monoterpenoids.
• L. luisieri possesses promising antimicrobial properties, particularly against fungal and gram-positive bacterial pathogens.
• Further research into these compounds could lead to the development of new antimicrobial agents.