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\beta-Carotene does not form a true Langmuir monolayer at the air/water interface

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\beta-Carotene does not form a true Langmuir monolayer at the air/water interface

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dc.contributor.author Mildner, Justyna [USOS905] pl
dc.contributor.author Dynarowicz-Łątka, Patrycja [SAP11012997] pl
dc.date.accessioned 2015-02-26T08:07:58Z
dc.date.available 2015-02-26T08:07:58Z
dc.date.issued 2012 pl
dc.identifier.issn 0927-7765 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/3339
dc.language eng pl
dc.title \beta-Carotene does not form a true Langmuir monolayer at the air/water interface pl
dc.type JournalArticle pl
dc.description.physical 244-247 pl
dc.abstract.en \Beta Carotene, positively recognized in literature [18, followed by subsequent papers] as regards its film-forming abilities at the water/air interface, was subjected to further Langmuir monolayer investigations. A wide variety of organic solvents and their mixtures have been tested in order to choose the best spreading solvents for monolayer experiments. A constant surface pressure rise, without characteristic for collapse spike or plateau, was observed upon compressing films dropped onto the air/water interface from all the solvents studied. However, a surface pressure increase alone is an insufficient criterion to evidence a true monolayer formation. The application of Brewster angle microscopy (BAM) indicated the presence of crystalline domains even at large molecular areas, contrary to homogeneous monolayer, which has been expected based on the above-mentioned reports. The addition of surface active substances (n-pentanol or iso-propanol) into \beta carotene solution does not improve whatsoever its spreading behaviour. Our experiments indicate that \beta carotene is not capable of forming monomolecular films at the free water surface and therefore is not suitable material for investigations with the Langmuir technique. Thus, this study shows the importance of using complementary - to classical surface manometry - techniques to confirm the true monolayer formation from molecules of interest. pl
dc.subject.en brewster angle microscopy pl
dc.subject.en Langmuir monolayers pl
dc.subject.en air-water interface pl
dc.subject.en \beta carotene pl
dc.description.volume 90 pl
dc.identifier.doi 10.1016/j.colsurfb.2011.09.041 pl
dc.identifier.eissn 1873-4367 pl
dc.title.journal Colloids and Surfaces. B, Biointerfaces pl
dc.language.container eng pl
dc.affiliation Wydział Chemii : Zakład Chemii Ogólnej pl
dc.subtype Article pl
dc.rights.original bez licencji pl
.pointsMNiSW [2012 A]: 30


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