Antimicrobial activity of allocasuarina littoralis methanolic leaf extracts

The antimicrobial activity of a methanolic extract of Allocasuarina littoralis leaves was investigated by disc diffusion assay against a panel of bacteria and fungi. A. littoralis leaf extract inhibited the growth of 8 of the 14 bacteria tested (57%). Gram-positive and Gramnegative bacteria were both inhibited by A. littoralis extract although Gram-positive bacteria were more susceptible. 5 of the 11 Gramnegative bacteria (45%) and 100% of the Grampositive bacteria tested had their growth inhibited by A. littoralis extract. A. littoralis leaf extract displayed no antifungal activity towards any of the fungi when tested by disc diffusion assay. The antibacterial activity of A. littoralis leaf extract was further investigated by growth time course assays which showed significant growth inhibition in cultures of Bacillus cereus, Bacillus subtilis and Pseudomonas fluorescens within 1 h but not of Aeromonas hydrophilia. Keywords: Allocasuarina littoralis, She-oak, Australian plants, antibacterial activity, medicinal plants
Table of Contents Abstract Introduction Materials and Methods Results and Discussion References Introduction Allocasuarina littoralis (black she-oak; previously known as Casuarina littoralis and Casuarina suberosa), a member of the genus [...]