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231223s2010 xx |||||o 00| ||eng c |
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|a 10.1021/la1031812
|2 doi
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|a pubmed24n0677.xml
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|a (NLM)21028852
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|a DE-627
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|e rakwb
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|a eng
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|a Chen, M L
|e verfasserin
|4 aut
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|a Solution self-assembly and adsorption at the air-water interface of the monorhamnose and dirhamnose rhamnolipids and their mixtures
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|c 2010
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 06.04.2011
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|a Date Revised 21.11.2013
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a The self-assembly in solution and adsorption at the air-water interface, measured by small-angle neutron scattering, SANS, and neutron reflectivity, NR, of the monorhamnose and dirhamnose rhamnolipids (R1, R2) and their mixtures, are discussed. The production of the deuterium-labeled rhamnolipids (required for the NR studies) from a Pseudomonas aeruginosa culture and their separation into the pure R1 and R2 components is described. At the air-water interface, R1 and R2 exhibit Langmuir-like adsorption isotherms, with saturated area/molecule values of about 60 and 75 Å(2), respectively. In R1/R2 mixtures, there is a strong partitioning of R1 to the surface and R2 competes less favorably because of the steric or packing constraints of the larger R2 dirhamnose headgroup. In dilute solution (<20 mM), R1 and R2 form small globular micelles, L(1), with aggregation numbers of about 50 and 30, respectively. At higher solution concentrations, R1 has a predominantly planar structure, L(α) (unilamellar, ULV, or bilamellar, BLV, vesicles) whereas R2 remains globular, with an aggregation number that increases with increasing surfactant concentration. For R1/R2 mixtures, solutions rich in R2 are predominantly micellar whereas solutions rich in R1 have a more planar structure. At an intermediate composition (60 to 80 mol % R1), there are mixed L(α)/L(1) and L(1)/L(α) regions. However, the higher preferred curvature associated with R2 tends to dominate the mixed R1/R2 microstructure and its associated phase behavior
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Lipids
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|a Solutions
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|a Water
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|a Penfold, J
|e verfasserin
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|a Thomas, R K
|e verfasserin
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|a Smyth, T J P
|e verfasserin
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|a Perfumo, A
|e verfasserin
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|a Marchant, R
|e verfasserin
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|a Banat, I M
|e verfasserin
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|a Stevenson, P
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|a Parry, A
|e verfasserin
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|a Tucker, I
|e verfasserin
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|a Grillo, I
|e verfasserin
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 26(2010), 23 vom: 07. Dez., Seite 18281-92
|w (DE-627)NLM098181009
|x 1520-5827
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|g volume:26
|g year:2010
|g number:23
|g day:07
|g month:12
|g pages:18281-92
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|u http://dx.doi.org/10.1021/la1031812
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