Antimicrobial compounds isolated from Tropaeolum tuberosum

Area of Science:

• Natural Product Chemistry
• Medicinal Chemistry
• Microbiology

Background:

• Tropaeolum tuberosum, commonly known as mashua, is a plant with a history of traditional medicinal use.
• The exploration of natural products for novel antimicrobial agents remains a critical area of research.
• Previous research has not identified the specific antimicrobial activities of compounds isolated from black Tropaeolum tuberosum tubers.

Purpose of the Study:

• To isolate and characterize bioactive compounds from black Tropaeolum tuberosum tubers.
• To evaluate the antimicrobial (antibacterial and antifungal) potential of the isolated compounds.
• To compare the efficacy of isolated compounds against standard antimicrobial drugs.

Main Methods:

• Activity-guided fractionation of black Tropaeolum tuberosum tuber extracts.
• Isolation and structural elucidation of compounds using spectroscopic techniques.
• Determination of minimum inhibitory concentrations (MICs) against various bacterial and fungal strains.

Main Results:

• Two compounds, 3-[3-(3-pyridinyl)-1,2,4-oxadiazol-5-yl] benzonitrile (1) and [3,5-Bis(1,1-dimethylethyl)-4-hydroxyphenyl] ethenylidene] bis-phosphonic acid tetraethyl ester (2), were isolated.
• Both compounds exhibited broad-spectrum antibacterial activity, with compound 2 showing comparable efficacy to ampicillin against Enterococcus faecalis and Salmonella enteritidis.
• Compounds 1 and 2 demonstrated significant antifungal activity against Candida tropicalis and Saccharomyces kudriavzevii, with compound 2 showing superior activity against S. kudriavzevii compared to fluconazole.

Conclusions:

• Compounds 1 and 2, isolated from Tropaeolum tuberosum, possess notable antibacterial and antifungal activities.
• These findings represent the first report of antimicrobial activities for these specific compounds.
• The isolated compounds hold promise as potential leads for the development of new antimicrobial therapies.