Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/62859

TitleC12E7-DPPC mixed systems studied by pyrene fluorescence emission
Author(s)Rei, M. Céu
Coutinho, Paulo J. G.
Castanheira, Elisabete M. S.
Real Oliveira, M. Elisabete C.D.
KeywordsNon-ionic surfactants
Dipalmitoylphosphatidylcholine
Egg phosphatidylcholine
Lipid/surfactant interactions
Pyrene emission
Ground-state aggregation
Issue date7-Jun-2004
PublisherSpringer-Verlag
JournalProgress in Colloid and Polymer Science
CitationRei M.C., Coutinho P.J.G., Castanheira E.M.S., Oliveira M.E.C.D.R. () C12E7-DPPC mixed systems studied by pyrene fluorescence emission. In: Miguel M., Burrows H. (eds) Trends in Colloid and Interface Science XVI. Progress in Colloid and Polymer Science (Trends in Colloid and Interface Science XVI), vol 123. Springer, Berlin, Heidelberg
Abstract(s)The lipid/surfactant mixed interactions between the lipids dipalmitoylphosphatidylcholine (DPPC) or egg phosphatidylcholine (EggPC) and the non-ionic surfactant C12E7 [C12H25(OCH2CH2)7OH] were studied by the use of the fluorescence properties of pyrene, namely the excimer to monomer emission intensity ratio, IE/IM. Previously, the behaviour of the C12E7/water system was also monitored. It was found to exhibit a significant preassociation of pyrene in ground state, which is more pronounced in micelles than in premicellar aggregates. In mixed systems, pyrene has proved to detect the changes from mixed bilayers to mixed micelles. The temperature influence in lipid/surfactant interactions was also studied. It was found that the pyrene IE/IM ratio is sensitive to the phase transition of DPPC. Pyrene microcrystallites are probably present in the gel phase region, justifying the enhancement of IE/IM in the DPPC/C12E7 system at low temperatures.
TypeConference paper
Description"Trends in colloid and interface science XVI : [the fifteenth meeting of the European Colloid and Interface Society (ECIS) was held in Coimbra from 16th to 21st September 2001] "
URIhttp://hdl.handle.net/1822/62859
ISBN3540005536
DOI10.1007/b11647
ISSN0340-255X
Publisher versionhttps://link.springer.com/chapter/10.1007/978-3-540-36462-7_20
Peer-Reviewedyes
AccessOpen access
Appears in Collections:CDF - FAMO - Artigos/Papers (with refereeing)

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