High hydrostatic pressure induced changes on palm stearin emulsions

Date

2018-07-01

Author

Sevdin, Sezen
Özel, Barış
Yucel, Umut
Öztop, Halil Mecit
Alpas, Hami

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

125
views

0
downloads

Emulsions are thermodynamically unstable systems formed through blending of two immiscible fluids. Recent studies have shown that High Hydrostatic Pressure (HHP) can initiate or accelerate lipid crystallization in emulsions. In this study, the effect of HHP on lipid crystallization was examined. Emulsion samples were prepared with palm stearin (PS) as the oil phase and sodium caseinate (SC) as the emulsifier and they were pressurized at 100 and 500 MPa at 10, 20 and 40 degrees C for 15 min. In order to determine the crystal structure of the emulsions, differential scanning calorimeter (DSC) was used and the change in the crystal morphology during 28 day-storage at 4 degrees C was observed. Nuclear Magnetic Resonance Relaxometry (NMR) experiments were also conducted and transverse relaxation time (T-2) and self-diffusion coefficient (SDC) values showed a trend to follow polymorphic changes of lipid crystals. Results showed that pressure and storage time both had significant effects (p < 0.05) on the crystal structures of emulsions.

Subject Keywords

High Hydrostatic Pressure, Lipid Crystallization, Transverse Relaxation Time, Self-Diffusion Coefficient, Storage Time

URI

https://hdl.handle.net/11511/31455

Journal

JOURNAL OF FOOD ENGINEERING

DOI

https://doi.org/10.1016/j.jfoodeng.2017.10.007

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

High temperature bromination. Part 12: Bromination of 7-oxabenzonorbornadiene: Synthesis of 2,3-dibromo-7-oxabenzonorbornadiene Altundas, A; Dastan, A; McKee, MM; Balcı, Metin (Elsevier BV, 2000-08-11) The electrophilic addition of bromine to 7-oxabenzonorbornadiene (8) at 0 degrees C led in high yield to the formation of dibromoaldehyde 10. However, high-temperature bromination of 8 in carbontetrachloride at 77 degrees C gave non-rearranged products 17 and 18. From the elimination of non-rearranged products, 2-bromo-7-oxabenzonorbornadiene (12) was obtained. Similarly, bromination of monobromide 12 at 77 degrees C yielded the non-rearranged tribromides 19 and 20 while bromination of 12 at 0 degrees C gav...
Viscosity measurement and modeling of lipid supercritical carbon dioxide mixtures Yener, Meryem Esra; Rizvi, SSH; Harriott, P (1998-01-31) The viscosities of supercritical carbon dioxide (SC-CO2) containing different levels of methyl oleate and oleic acid were measured with a high pressure capillary viscometer. The SC-CO2-methyl oleate system was evaluated at 313.15, 323.15 and 333.15 K and 11.5, 13.7 and 15.5 MPa, respectively. The SC-CO2-oleic acid system was evaluated at 313.15 K and 20.5 and 30.0 MPa and 333.15 K and 30.0 MPa. The increase in SC-CO2 viscosity was as high as 15-20% at the maximum methyl oleate concentrations (4-5 wt%) and 6...
High temperature microstructural stability and recrystallization mechanisms in 14YWT alloys Aydoğan Güngör, Eda; Takajo, S.; Vogel, S. C.; Maloy, S. A. (Elsevier BV, 2018-04-01) In-situ neutron diffraction experiments were performed on room temperature compressed 14YWT nanostructured ferritic alloys at 1100 degrees C and 1150 degrees C to understand their thermally activated static recrystallization mechanisms. Existence of a high density of Y-Ti-O rich nano-oxides ( and {112} texture components during annealing, in contrast to the conventional recrystallization textures in body centered cubic alloys. Furthermore, nano-oxide size, shape, density and distribution are considerably di...
Flow induced polymer-filler interactions: Bound polymer properties and bound polymer-free polymer phase separation and subsequent phase inversion during mixing Akay, G. (Wiley, 1990-11) The irreversible absorption of macromolecules on to solid filler particles during mixing in the melt is investigated. The molecular weight and concentration dependence of the absorbed layer thickness are evaluated and the chemical and morphological nature of the irreversibly absorbed polymer (bound polymer) are determined. It is found that the thickness of the bound polymer is not only dependent on the filler concentration but also dependent on polymer molecular weight. Bound polymer in high density polyeth...
Enhanced vaterite and aragonite crystallization at controlled ethylene glycol concentrations Oral, Çağatay Mert; Kapusuz, Derya; Ercan, Batur (Sakarya Üniversitesi, 2019-04-01) Calcium carbonate (CaCO3) has three distinct anhydrous polymorphs, namely vaterite, aragonite and calcite. Although there is a high demand for aragonite and vaterite polymorphs for biomedical use, their unstable nature makes it challenging to synthesize them compared to calcite, which is the most stable form of CaCO3. Despite the remarkable effort on stabilizing vaterite and aragonite polymorphs in aqueous solutions, phase-pure vaterite and aragonite polymorphs have not been synthesized yet, without referri...

Citation Formats

S. Sevdin, B. Özel, U. Yucel, H. M. Öztop, and H. Alpas, “High hydrostatic pressure induced changes on palm stearin emulsions,” JOURNAL OF FOOD ENGINEERING, pp. 65–71, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31455.