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• Structure

  Rhamnolipids have two moieties: Rhamnose (also known as glycon part) and lipid (also known as aglycon part). Rhamnose moiety is hydrophilic in nature comprising of mono or di (L)-rhamnose molecules which are linked together through α-1,2-glycosidic linkage. The lipid moiety is hydrophobic in nature and comprises of one or more saturated/unsaturated β-hydroxy fatty acids chains of C8−C24 lengths, linked together with an ester bond. Both moieties are linked via glycosidic linkage. The structural properties of microbial rhamnolipids depend on environmental and growth conditions. They are generally obtained as complex mixtures of congeners: mono-rhamnolipids and di-rhamnolipids, differing in the number of rhamnose groups present; within each of these two classes, congeners differ in terms of chain length, degree of branching, and unsaturation of the fatty acid chains. For example, rhamnolipids produced by P. aeruginosa are mixtures of about 30 different molecules; by considering all the possible microbial origins, up to 60 rhamnolipid congeners and homologs have been identified. ;

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