Jacaranda cuspidifolia Mart. (Bignoniaceae) as an antibacterial agent

Area of Science:

• Pharmacology
• Ethnobotany
• Natural Products Chemistry

Background:

• Jacaranda cuspidifolia Mart. (Family Bignoniaceae) is a Brazilian plant traditionally used for treating syphilis and gonorrhea.
• Antimicrobial resistance necessitates the exploration of novel therapeutic agents from natural sources.

Purpose of the Study:

• To evaluate the in vitro antimicrobial activity of different extracts and fractions of Jacaranda cuspidifolia bark.
• To identify potential bioactive compounds responsible for the observed antimicrobial effects.

Main Methods:

• The hexane extract (JCHE), methanol extract (JCME), and chloroform fraction (JCCF) were prepared from Jacaranda cuspidifolia bark.
• Antimicrobial activity was assessed using the disc diffusion method and determination of minimum inhibitory concentration (MIC) values.
• Phytochemical analysis and high-performance liquid chromatography (HPLC) were employed to identify compounds.

Main Results:

• JCHE showed no significant antimicrobial activity.
• JCME exhibited activity against Streptococcus pyogenes, Staphylococcus aureus, and Neisseria gonorrhoeae.
• JCCF demonstrated broad-spectrum activity against Staphylococcus epidermidis, S. aureus, Proteus mirabilis, Serratia marcescens, S. pyogenes, Enterobacter aerogenes, and N. gonorrhoeae.
• Phytochemical screening revealed the presence of saponins, flavonoids, tannins, alkaloids, and other compounds in JCME and JCCF.
• Verbascoside was identified as a major compound in JCME and JCCF.

Conclusions:

• The methanol extract and chloroform fraction of Jacaranda cuspidifolia bark possess significant in vitro antimicrobial properties.
• These findings support the traditional use of this plant for treating bacterial infections.
• Verbascoside is a potential bioactive compound contributing to the antimicrobial activity of Jacaranda cuspidifolia.