Phytochemical And Antibacterial Screening Of Ethanol Extracts Of Six Dye Plants

A.O. Adetuyi¹*, V.O. Oyetayo², A. V. Popoola² and L. Lajide¹

¹Department of Chemistry, Federal University of Technology, Akure (Nigeria) ²Department of Microbiology, Federal University of Technology, Akure (Nigeria)

ABSTRACT: Ethanol extracts of six dye plants viz. Pterocarpus erinaceus, Zingiber officinale, Zanthoxylum zanthoxyloides, Morinda lucida, Bixa orellana and Sorghum caudatum, were screened for secondary metabolites and antimicrobial activity against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa. The ethanol extracts of Z. zanthoxyloides, Z. officinale and M. lucida were able to inhibit the growth of the three indicator bacteria with the zones of inhibition between 0.50-11.6mm. P. erinaceous inhibited Staphylococcus aureus and E. coli; B. orellana inhibited Staphylococcus aureus and Pseudomonas aeruginosa while S. caudatum inhibited Pseudomonas aeruginosa only. All the dye extracts show the presence of at least three secondary metabolites, and these might be respondible for their antibacterial properties and their usefulness as medicinal plants. It may also enhance the stability of the plants colurants as added additives to polymer substrates.

KEYWORDS: Antibacterial; Phytochemical effect; ethanol extract; dye plants

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