The antimicrobial activities of extracts of Sidium guajava and Citrus aurantifolia

Abstract

The antibacterial effects of extracts from P. guajava (guava) and C. aurantifolia (lime) leaves were  demonstrated in vitro against some Gram positive and Gram negative bacteria. An ethanolic extract from C. aurantifolia exhibited mean zones of inhibition of l 4.2mm, 9.2mm, 8.5mm, 8.1 mm and 7 .2mm on Bacillus subtilis. Salmonella sp, Escherichia coli, Streptococcus faeralis, and Staphylococcus aureus respectively. The water extracts exhibited mean zones of inhibition of 13.7m and 9.7mm on£. coli and P. guajava were  bactericidal against Sallmonella sp and E. Coli with mean zones of inhibition  if 15.2mm and 13, 9mm  respectively. Results from this study provide evidence for the medicinal values of the tested plants and thus their therapeutic utilization singly or jointly by patients with fevers and gastrointestinal disorders.