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conformational investigation of zwitterionic surfactants in the micelle via ¹³C chemical shift measurements and 2D NOESY spectroscopy
The conformation and orientation of a series of zwitterionic surfactants (the alkyl-N,N-dimethylammoniopropanesulfonates, or Zwittergent® Detergents) has been studied via ¹³C chemical shift measurements and 2D NOESY spectroscopy. Chemical shift changes (Δδ values) support the tendency for the interc...
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Published in: | Colloid and polymer science 2010-04, Vol.288 (6), p.653-663 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The conformation and orientation of a series of zwitterionic surfactants (the alkyl-N,N-dimethylammoniopropanesulfonates, or Zwittergent® Detergents) has been studied via ¹³C chemical shift measurements and 2D NOESY spectroscopy. Chemical shift changes (Δδ values) support the tendency for the intercharge arm to adopt a ring-like orientation as the alkyl chain length increases. Protons of the headgroup regions for both the 8 carbon and the 10 carbon Zwittergent® appear to form a greater number of intermolecular interactions with headgroups of neighboring monomers in the micelle. Interactions between the end of the alkyl chain and the headgroup region of the 12 carbon Zwittergent® are also apparent from examination of the NOESY spectrum indicating that the tail folds back towards the surface of the micelle. These results indicate that a combination of the ring-like conformation of the intercharge arm along with crowding in the vicinity of the sulfonate group could explain why ZW3-12 appears to behave more as a cationic surfactant in previously studied mixed micellar systems. |
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ISSN: | 0303-402X 1435-1536 |
DOI: | 10.1007/s00396-009-2182-1 |