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Antimicrobial assay of prodigiosin (1), 2-methyl-3-heptyl-prodiginine (2), 2-methyl-3-propyl-prodiginine (3), 2-methyl-3-butyl-prodiginine (4). (−): to use DMSO as a negative control. (+): to use nystatin as a positive control in the antifungal test against Candida albicans; to use polymyxin as a positive control in the antibacterial test against Salmonella paratyphi B, Pseudomonas aeruginosa, Methicillin-resistant Staphylococcus aureus, Bacillus subtilis, and Escherichia coli.
