Influence of pH on the micelle-to-vesicle transition in aqueous mixtures of sodium dodecyl benzenesulfonate with histidine

Yamaira I. González, Hisanori Nakanishi, Maria Stjerndahl, Eric W. Kaler

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

Small unilamellar vesicles (∼100 nm in diameter) form spontaneously in aqueous mixtures of histidine and sodium dodecyl benzenesulfonate. By manipulating pH, a gradual transition from micelles to vesicles to bilayers to precipitate is observed. The self-assembly of vesicles occurs over a wide range of compositions when the solution pH is lower than 6.0, the pk a of the imidazole moiety on the histidine molecule. This phenomenon is likely the result of attractive interactions between the negatively charged benzenesulfonate headgroups and the positively charged imidazole group in the amino acid. Similar results are obtained when imidazole salt itself is used.

Original languageEnglish (US)
Pages (from-to)11675-11682
Number of pages8
JournalJournal of Physical Chemistry B
Volume109
Issue number23
DOIs
StatePublished - Jun 16 2005

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