Antimicrobial Activity of Novel Furanonaphthoquinone Analogs

Analogs of furanonaphthoquinone (FNQ) from Tecoma ipe Mart had MICs ranging from 1.56 to 25 μg/ml against gram-positive bacteria. FNQ showed significantly lower MICs against methicillin-resistant Staphylococcus aureus than against methicillin-sensitive S. aureus. FNQ inhibited Helicobacter pylori with an MIC of 0.1 μg/ml. Fungi, including pathogenic species, were sensitive to FNQ with MICs similar to those of amphotericin B.