Inhibition of Staphylococcus aureus by aqueous Goiaba extracts.

Original article


Gnan SO, Demello MT.

Food Science Department, College of Agriculture, University of El-Fateh, Tripoli, Libya.

J Ethnopharmacol. 1999 Dec 15;68(1-3):103-8.


The antimicrobial activity of an aqueous extract of three Brazilian medicinal plants, Alhodomato (Allium sativon), Traoeraba (Comnelina beghlensis) and Goiaba (Psidium guajava), was studied and compared with commercial antibiotics using three different methods: plate count, disk inhibition zone and turbidity techniques. Results indicated that Goiaba leaf extract at a concentration of 8 and 40 mg/ml showed promising results. As Goiaba leaf extract showed good antimicrobial activity against Staphylococcus aureus, nine different strains were tested using these methods. Results showed a complete inhibition of all strains tested at a concentration of 6.5 mg/ml. This indicates that Goiaba leaf extract could be an important source of food preservative and a new source of an antimicrobial agent against S. aureus.

Keywords: Staphylococcus aureus; Antimicrobial activity; Goiaba; Inhibition