Journal
EUROPEAN JOURNAL OF MASS SPECTROMETRY
Volume 18, Issue 4, Pages 399-406Publisher
IM PUBLICATIONS
DOI: 10.1255/ejms.1194
Keywords
rhamnolipids; Pseudomonas aeruginosa; biosurfactants; mass spectrometry; ESI-MS
Funding
- PARTEX OIL AND GAS
- Fundacao para a Ciencia e a Tecnologia [Pest-C/CTM/LA0011/2011, SFRH/BD/60228/2009]
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In this work, biosurfactants produced by two Pseudomonas aeruginosa strains isolated from Brazilian crude oils were identified by proton nuclear magnetic resonance (H-1 NMR) and further characterized by mass spectrometry (MS) coupled with electrospray ionization (ESI) and tandem mass spectrometry (MS/MS) analysis in positive mode and their surface activities evaluated. Mono-rhamnolipids and di-rhamnolipids were identified for both isolates, but the most abundant were found to be mono-rhamnolipids. The similarity of rhamnolipids produced by the two strains was in good agreement with their surface activities. Both biosurfactants exhibited similar aqueous solution surface tensions, high emulsification indexes and critical micelle concentration values. The results obtained show that ESI-MS and MS/MS analysis alone provide a fast and highly specific characterization of biosurfactants produced by microbial strains.
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