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Hydrophilic Carotenoids: Surface Properties and Aggregation of Crocin as a Biosurfactant
Author(s) -
Naess Stine Nalum,
Elgsaeter Arnljot,
Foss Bente Jeanette,
Li Baojun,
Sliwka HansRichard,
Partali Vassilia,
Melø Thor Bernt,
Naqvi K. Razi
Publication year - 2006
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.200690011
Subject(s) - chemistry , crocin , adsorption , surface tension , carotenoid , conjugated system , saturation (graph theory) , organic chemistry , chromatography , biochemistry , polymer , thermodynamics , physics , mathematics , combinatorics
The surface and aggregation properties of the naturally occurring carotenoid crocin ( 1 ), examined through measurements of surface tension and UV/VIS absorption, have been used to determine the following parameters: critical aggregate concentration, surface‐saturation concentration, molecular area, free energy of adsorption and micellation, adsorption‐micellar energy relationship, equilibrium constants, and aggregate size. On structural grounds and based on the determined molecular area at the interface, the digentiobiosyl ester of the conjugated, highly unsaturated carotenoid diacid crocetin C20 : 7 should be classified as a bolaamphiphile. Crocin forms true monomolecular solutions in H 2 O; only at rather high concentrations aggregation occurs.