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A new benzophenone glycoside from the leaves of Mitracarpus villosus
Kenneth G Ngwoke1,2, Njideka Orame2, Shuai Liu1
1a Institute of Pharmaceutical Biology and Biotechnology , Heinrich Heine University , Duesseldorf , Germany.
Abstract:
A new benzophenone glycoside, mitraphenone A (1), together with three known compounds (2-4) were isolated from the leaves of the traditionally used medicinal plant Mitracarpus villosus (Rubiaceae) collected in Nigeria. A combination of one- and two-dimensional NMR spectroscopic and mass spectrometric measurements were carried out to identify the structure of 1. All isolated compounds (1-4) were screened for their antibacterial activity against several Gram-positive and Gram-negative bacteria. Compound 1 exhibited moderate activity against Enterococcus faecium (strains ATCC 35667 and ATCC 700221) and Staphylococcus aureus ATCC 25923 with MIC values ranging from 25 to 50 μM.
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