Antimicrobial potential of Rothmannia longiflora Salisb and Canna indica Linn extracts against selected strains of fungi and bacteria

Abstract

This study was conducted to investigate the antimicrobial activities of the methanolic extract of Rothmannia longiflora and Canna indica leaves against 10 pathogenic bacterial and fungal strains. The methanolic extract from the two plants were screened for their minimum inhibitory concentration (MIC) against the microbial growth of Staphylococcus aureus, Escherichia coli, Bacillus subtilis, Pseudomonas aeruginosa, Salmonella typhi, Klebsiella pneumonia, Candida albicans, Aspergillus niger, Phjapus stolometer and Penicillium notatum. The results show that inhibition of microbial growth decreased with decreasing concentrations of the plant extracts. While concentrations of 200 and 100 mg/ml completely inhibited microbial growth, lower concentrations (50 and 25 mg/ml) showed partial inhibition, extracts at lower concentrations than these had no effects on microbial growth of microorganisms tested. Comparatively, R. longiflora gave better results than C. indica. This study confirmed the effectiveness of methanolic extracts of the two plants as inhibitory effect to microbial growth of several pathogenic microorganisms and testified to the basis of the ethnomedicinal uses of these two plants against several microbial infections.

Potential of Canna indica in Constructed Wetlands for Wastewater Treatment: A Review

“…Due to high antimicrobial activity [32,46,47], different parts of this plant are used as traditional medicine to cure various diseases [48]. It contains palatable natural starch; thus, it can be used as food.…”

Phytochemical composition and antibacterial activity of ethanolic extract from trunk of Rothmannia wittii (Craib) Bremek. (Rubiaceae) newly found in Vietnam

“…The presence of these bioactive compound in R. wittii extracts suggests that this species could be a potential source for isolating bioactive compounds, with a possibility of their further application in medicine or as a promising remedy for treating certain diseases such as cancer and infectious diseases (Lakshmanan et al, 2011;Habtemariam et al, 2018). To date, only a few species of Rothmannia genus have been investigated with a focus on their antibacterial activity; for example, Awosan et al (2014) proved the antimicrobial effect of the methanolic extract of R. longiflora leaf against 10 pathogenic fungal and bacterial strains. The lack of evidences of bioactivity and chemical composition of R. wittii is a large hindrance to use this species in the industry and medicine.…”