Balanophora elongata is categorized as Balanophoraceae which is the most found in West Sumatra on their family. The plants in similar family shown the potential as significant anti radical, cytotoxic in cancer and also have a role in toxification. The aim of this study is to know the antibacterial activity of this plant toward Pseudomonas aeruginosa. The method that we use is extraction and antimicrobial test with diffusion disc. The compound in extract consists of terpenoids / steroids,

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... cs, flavonoids and negative alkaloid. The antibacterial activity was assayed with diffusion disc method. This study showed that Balanophora elongata is effective as anti-Pseudomonas aeruginosa. The isolates from this plant were obtained and need more characterization.