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Molecular interaction of triglycerides on a modified silica (Kieselguhr G): a thermodynamical approach by surface tension calculation and DSC measurements
Author(s) -
Lonchampt Pierre,
Fanni Jacques,
Linder Michel,
Parmentier Michel
Publication year - 2001
Publication title -
european journal of lipid science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.614
H-Index - 94
eISSN - 1438-9312
pISSN - 1438-7697
DOI - 10.1002/1438-9312(200109)103:9<576::aid-ejlt5760>3.0.co;2-x
Subject(s) - degree of unsaturation , chemistry , surface tension , melting point , silica gel , partition coefficient , chromatography , chemical engineering , organic chemistry , thermodynamics , physics , engineering
Peanut and linseed oils were drained vertically on thin layers, made of either native, hydrophilic or hydrophobic Kieselguhr G (silica), in order to get information on the interactions that may occur between triglycerides (TGs) and the filtering material. Except for hydrophobic silica, a partition of the TGs as function of the distance run was observed. Highly‐unsaturated TGs were concentrated at the starting point of the running distance and distances between fractions grew larger with the hydrophobicity of the silica. Surface tension components of silica were calculated: whereas Van Oss' method could not discriminate between hydrophilic and hydrophobic Kieselguhr G, Chibowski 's method differentiated both compounds by a higher electron donor component (γ) in hydrophilic silica. Calorimetric studies of pure TGs interacting with Kieselguhr G discriminated between saturated TGs exhibiting a lower melting temperature as they interacted with the support, and unsaturated TG having a higher melting temperature. It is concluded that electron densities are involved in interactions occurring between TGs and silica, i.e. high unsaturation number and high γ component.