Molecular interaction of triglycerides on a modified silica (Kieselguhr G): a thermodynamical approach by surface tension calculation and DSC measurements

Abstract

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 γcomponent.

Production and Physicochemical Properties of Functional-Butterfat through Enzymatic Interesterification in a Continuous Reactor

“…ABF contained many TAG peaks because of its various fatty acid compositions from butyric acid to linolenic acid, as summarized in Table and Figure . The TAG species in PS and FSO were identified with standard samples and from previous studies − . PS consists of mainly three ECNs as follows: ECN 46 (7.2 area % PLO and 13.0% PLP), ECN 48 (1.8% OOO, 11.4% POO, 24.1% POP, and 22.2% PPP) and ECN 50 (0.8% SOO, 3.7% POS, and 3.9% PPS).…”

“…ABF contained many TAG peaks because of its various fatty acid compositions from butyric acid to linolenic acid, as summarized in Table 1 and Figure 6. The TAG species in PS and FSO were identified with standard samples and from previous studies (24)(25)(26) Generally, diversified TAG species from the rearrangement of TAG profiles after enzymatic interesterification tend to form β′ type crystals (26).…”