Biosurfactants: From Genes to Applications by Gloria Soberón-Chávez

By Gloria Soberón-Chávez

Biosurfactants, tensio-active compounds produced via dwelling cells, are actually gaining expanding curiosity as a result of their strength functions in lots of assorted business parts within which so far virtually solely man made surfactants were used. Their particular buildings and features are only growing liked. furthermore, biosurfactants are thought of to be environmentally “friendly,” rather non-toxic and biodegradable. This Microbiology Monographs quantity bargains with the latest advances within the box of microbial biosurfactants, resembling rhamnolipids, serrawettins, trehalolipids, mannosylerythritol lipids, sophorolipids, surfactin and different lipopeptides. each one bankruptcy stories the features of somebody biosurfactant together with the physicochemical homes, the chemical constructions, the position within the body structure of the manufacturing microbes, the biosynthetic pathways, the genetic legislation, and the capability biotechnological applications.

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With methanol. Ion exchange chromatography exploits the fact that RLs behave as anions at high pHs, which allows their retention on columns of weak anion exchange resins such as (diethylamino)ethyl-sepharose. 6 M NaCl to the equilibration buffer. Yet, this method has been improved by Abadi et al. (2009), who applied phospholipid-coated colloidal magnetic nanoparticles ion exchange media for the recovery and purification of RLs from culture mixtures. Ultrafiltration with a membrane cutoff of 10 kDa leads to an almost complete Rhamnolipids: Detection, Analysis, Biosynthesis, Genetic Regulation 41 retention of RLs even at neutral pH.

De´ziel et al. (2003) later proposed that RhlA is responsible for the formation of HAAs, based on the observation that an rhlBÀ mutant produce HAAs Rhamnolipids: Detection, Analysis, Biosynthesis, Genetic Regulation 29 but no RLs while a rhlAÀ mutant does not produce neither HAAs nor RLs. Recently however, Zhu and Rock (2008) purified and characterized RhlA. They found that RhlA formed one molecule of b-hydroxydecanoyl-b-hydroxydecanoate (HAA) from two molecules of b-hydroxydecanoyl-ACP. They also showed that RhlA has a greater affinity for ten-carbon substrates (Zhu and Rock 2008).

Hence, it is noteworthy that s54 is also required for production of RLs (Ochsner et al. 1994a). While it has been suggested that the rhlAB transcription start site contains a s54 promoter (Ochsner et al. 1994a; Pearson et al. 1997), this was later refuted (Medina et al. 2003c). The alternative explanation is provided by the finding that rhlR transcription is partially s54-dependent (Medina et al. 2003a). All this corroborates the frequent observation that production of RLs is increased under nitrogen-limited conditions (Mulligan and Gibbs 1989).

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