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Negative electrospray ionization ((−)ESI) MS analysis (direct infusion) of rhamnolipids produced by Pseudomonas aeruginosa 89. Two clusters of peaks revealed two sets of homologue molecules. The first set evidenced three main signals corresponding to the [M − H]− of mono-rhamnolipids. The second set evidenced three main signals corresponding to the deprotonated molecules of di-rhamnolipids.
