A Study on Anti bacterial Properties of Costus speciosus

Anti biotic resistant bacteria have posed a serious threat to world health in recent years, forcing the investigation of alternate sources for anti bacterials. Higher plants are a key source of medicinal compounds. The objective of this study was to evaluate the anti bacterial properties of C. speciosus against gram-negative E. coli and gram-positive Staphylococcus aureus, to explore its potential as a natural alternative to conventional anti bioti cs. Leaves, stems, and rhizomes of C. speciosus were extracted using hexane, methanol, and water as solvents with reflux, sonication and maceratio. Anti bacterial activity was assessed using the disk diffusion assay, with gentamycin as a positive control. The stem- methanolic extract showed greater inhibition against both organisms compared to hexane extracts. Stem- water extracts were effective only against S. aureus. The rhizome-methanolic extract inhibited E. coli more than S. aureus, while the hexane extract was more effective against S. aureus. The rhizome-water extract inhibited the growth of both bacterial strains. Leaf extracts demonstrated significant inhibition against E. coli but no activity against S. aureus. This study shows that C. speciosus has significant anti bacterial properties, varying with plant part, solvent, and organism. Given the rise in anti biotic- resistant bacteria, C. speciosus is a promising natural source of anti bacterial agents. Keywords: Costus speciosus; Anti bacterial Activity; Escherichia coli; Staphylococcus aureus; Natural Anti biotics