Keywords :
Self-assembly; Sucrose-esters; Lecithin; Oleogel, Rheology; Microstructure, Surfactants; Synergistic
Abstract :
[en] In order to modify the self-assembly of sucrose esters (SEs) in sunflower oil, we added
sunflower lecithin (SFL) as co-surfactant. It is hypothesized that SFL modifies the selfassembly
of SEs by interrupting the extensive hydrogen bonding between SEs monomers. The
addition of SFL into SEs induced gelation of the mixed surfactant system oleogels at all
studied ratios. The 7:3 SEs:SFL combination showed enhanced rheological properties
compared to the other studied ratios, which suggests better molecular ordering induced by
SFL. The modifications might have been caused by interference in the hydrogen bonding,
connecting the polar heads of SEs molecules in the presence of SFL. This effect was
confirmed by thermal behavior and small angle x-ray diffraction (SAXD) analysis. From the
crystallization and melting analyses, it was shown that the peak temperature, shape and
enthalpy decreased as the SFL ratio increases. Meanwhile, the bi-component oleogels
exhibited new peaks in the SAXD profile, which imply a self-assembly modification. The
microscopic study through polarized and electrons revealed a change in the structure.
Therefore, it can be concluded that a synergistic effect between SEs and SFL, more
particularly at 7:3 ratio, towards sunflower oil structuring could be obtained. These findings
shed light for greater applications of SEs as structuring and carrier agent in foods and
pharmaceutical.
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