Surface properties and sub-surface aggregate assimilation of rhamnolipid surfactants in different aqueous systems

Z Raza, Z Khalid, M Khan, Ibrahim Banat, et al et al

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Abstract

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.
Original languageEnglish
Pages (from-to)811-816
JournalBiotechnology Letters
Volume32
Issue number6
Publication statusPublished - Jun 2010

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