Microencapsulation of Gac Oil by Spray Drying: Optimization of Wall Material Concentration and Oil Load Using Response Surface Methodology

Abstract

The objective of this study was to optimize the wall material concentration and the oil load on the encapsulation of Gac oil using spray drying by response surface methodology. Results showed that the quadratic polynomial model was sufficient to describe and predict encapsulation efficiencies in terms of oil, β-carotene, lycopene, peroxide value (PV), moisture content (MC), and total color difference (Δ E) with R ² values of 0.96, 0.95, 0.86, 0.89, 0.88, and 0.87, respectively. Under optimum conditions (wall concentration of 29.5 % and oil load of 0.2), the encapsulation efficiencies for oil, β-carotene, lycopene, PV, MC, and Δ E were predicted and confirmed as 92 %, 80 %, 74 %, 3.91 meq/kg, 4.14 % and 12.38, respectively. The physical properties of the encapsulated oil powders obtained by different formulations were also determined. It was concluded that the protein-polysaccharide matrix as the wall material was effectively used for spray-drying encapsulation of Gac oil.

Keywords:

• Gac oil
• Microencapsulation
• Response surface methodology
• Spray drying
• Whey protein

Notes

X₁: wall material concentration; X ₂: oil load.

*P < 0.05;

**P < 0.05;

***P < 0.05.

¹a_o is a constant; a_i, a_ii, a_ij are the linear, quadratic, and interactive coefficients of the second-order polynomial equation, respectively.

WPC: whey protein concentration.

WPC: whey protein concentration; L: lightness, C: chroma, and H°: hue angle.

WPC: whey protein concentration; L: lightness, C: chroma and H°: hue angle.

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