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| Aggregation of monorhamnolipid with concentrations near CMC in neutral solution |
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Abstract Size distribution of monorhamnolipid aggregates in neutral pH solutions with rhamnolipid concentration near critical micelle concentration (CMC) was studied. Aggregates were formed when rhamnolipid concentration was either below or above CMC. Three types of aggregates which were large (d=5000nm), medium (d=200~500nm) and small (d=40nm) in size were found. When pH was below 7.0 and the rhamnolipid concentration was below CMC, size of the medium-size aggregates decreased with increasing rhamnolipid concentration, and large-size and medium-size aggregates transformed into small-size aggregates. With the increase of solution pH, size of the medium-size aggregate also decreased, and large-size and medium-size aggregates transformed into small-size aggreqates. These observations were assumed to result from change of density and dissociation degree of monorhamnolipid molecule in the aggregates with rhamnolipid concentration and solution pH.
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Received: 27 April 2014
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