Thermomechanical Properties of High Oleic Palm Oil Assessed Using Differential Scanning Calorimetry, Texture...

Area of Science:

• Food Science and Technology
• Nutritional Biochemistry
• Materials Science

Background:

• Standard Palm Oil (SPO) is a common food ingredient with desirable thermophysical properties.
• High saturated fat content in SPO conflicts with American Heart Association dietary recommendations (<5% of caloric intake).
• Novel high oleic palm oil (HOPO) variants, like the OxG hybrid, offer reduced saturated fatty acids (<35% SFA) and increased oleic acid (>50%).

Purpose of the Study:

• To characterize and compare the thermophysical properties of HOPO against SPO.
• To provide data for potential functionalization of HOPO, such as in oleogelation.
• To quantify differences enabling HOPO's use in specific industrial applications.

Main Methods:

• Differential Scanning Calorimetry (DSC) for thermal analysis.
• Shear rheology to assess flow and deformation properties.
• Polarized light microscopy for crystal structure visualization.
• Texture analysis to determine mechanical properties like firmness.

Main Results:

• HOPO exhibited a lower onset crystallization temperature (7 °C lower than SPO).
• Rheological behavior showed similar trends to SPO, but with significant viscosity offsets linked to crystallization differences.
• SPO demonstrated a maximum peak force an order of magnitude higher than HOPO, indicating greater firmness.

Conclusions:

• While HOPO shares some thermophysical trends with SPO, significant differences in firmness, crystal morphology, and viscosity exist.
• These variations are not linearly correlated with the observed crystallization temperature offset.
• Quantified differences provide crucial insights for the food industry to effectively utilize HOPO in targeted applications.