The effect of adding a commercial phytosterol ester mixture on the phase behavior of palm oil. (October 2017)

• Record Type: Journal Article
• Authors: Daels, Eva; Foubert, Imogen; Goderis, Bart
• Is Part Of: Food research international. Volume 100 Part 1(2017)
• Page Start: 841
• Page End: 849
• Publication Date: 2017-10
• Subjects: DSC differential scanning calorimetry -- FA fatty acid -- HMF high-melting fraction -- LMF low-melting fraction -- PE phytosterol ester -- PO palm oil -- SAXS small angle X-ray scattering -- TAG triglyceride -- Toffset melting offset temperature -- Tonset crystallization onset temperature -- WAXD wide angle X-ray diffraction -- XRD X-ray diffraction; Phytosterol esters -- Polymorphism -- Synchrotron radiation -- Differential scanning calorimetry; Food -- Analysis -- Periodicals; Food industry and trade -- Periodicals; Food industry and trade -- Canada -- Periodicals; Food Technology -- Periodicals; Food -- Periodicals; Food-Processing Industry -- Periodicals; Aliments -- Industrie et commerce -- Périodiques; Aliments -- Industrie et commerce -- Canada -- Périodiques; Aliments -- Recherche -- Périodiques; Food industry and trade; Canada; Periodicals; Electronic journals; 664.005
• DOI: 10.1016/j.foodres.2017.08.015
• Languages: English
• ISSNs: 0963-9969

Abstract

Abstract: The objective of this study was to investigate in depth the non-isothermal crystallization and melting behavior of binary blends of palm oil (PO) with a commercial, multi-component phytosterol ester (PE) mixture. DSC and time-resolved synchrotron X-ray diffraction (XRD) experiments were conducted on blends with a PE concentration from 0 to 100% at intervals of 10% for DSC and 20% for XRD. Based on XRD, two different ordered structures were identified in pure the PEs. The structure designated as PEx was truly crystalline and needed a very high degree of supercooling for its nucleation from the melt. The structure designated PEy formed without supercooling and showed long-range order with multiple reflections at small angles but only one broad reflection at high angle, typical of liquid crystalline samples. Furthermore, PEy had a high tolerance for molecules of different chemical nature. In the PE-PO blends no other ordered structures were formed other than the ones observed in the pure PEs and PO. The peaks in the DSC runs of the PE-PO blends were linked to transitions of the different polymorphic forms. All structural information of the binary blends as a function of concentration and temperature was collected in morphology maps. The binary blends exhibited eutectic characteristics visualized in the morphology maps with a eutectic point at 40% PEs. Graphical abstract: Highlights: Pure commercial phytosterol ester mixture shows two different ordered structures. Peaks in DSC curves linked to different polymorphic forms. Morphology maps summarize structural information. Binary system shows eutectic characteristics.