Surface properties and sub-surface aggregate assimilation of rhamnolipid surfactants in different aqueous systems.
Tensioactive properties of rhamnolipids produced by a Pseudomonas aeruginosa strain were investigated in the presence or absence of Sr(2+) or Pb(2+). Surface and interfacial properties, and aggregate forming properties and morphologies were studied by various techniques including scanning electron microscopy. When the pH of a rhamnolipid aqueous solution (40 mg/l) was increased from 5 to 8, irregular vesicles gradually took the shape of oligo-vesicles, then regular vesicles and finally smaller spherical vesicles. Addition of metal ions controlled the aggregates' morphology and stability, and influenced the surface and interfacial behavior of rhamnolipid solutions.
Department of Applied Sciences, National Textile University, Faisalabad, 37610, Pakistan. zarazapk@yahoo.com
Zulfiqar Ali
ZA
Raza
Zafar M
ZM
Khalid
Mohammad Saleem
MS
Khan
Ibrahim M
IM
Banat
Asma
A
Rehman
Abdul
A
Naeem
Muhammad Tahir
MT
Saddique
D002413:Cations, Divalent / Q000378:metabolism; D006017:Glycolipids / Q000737:chemistry* / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000378:metabolism; D008855:Microscopy, Electron, Scanning; D011550:Pseudomonas aeruginosa / Q000378:metabolism*; D013324:Strontium / Q000378:metabolism; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry* / Q000378:metabolism*
D002413:Cations, Divalent; D006017:Glycolipids; D013501:Surface-Active Agents; C418382:rhamnolipid; D007854:Lead; D013324:Strontium