Feasibility of microencapsulating red palm oil (RPO) with solution enhanced-dispersion by supercritical carbon dioxide (SEDS) without using high-temperatures or organic solvents was assessed. RPO prepared as oil-in-water (o/w) emulsion (11.7% RPO, 69.9% water, 3.5% sodium caseinate, 14.0% maltodextrin, 1.0% soy lecithin) could be encapsulated at all conditions (100–150 bar, 40–60 °C, feed injection flow rate 2.5 mL/min). Microcapsules produced with the SEDS method (125 bar, 50 °C, CO2 feed 150 L/h) were flowable, spherical powders (d = 5.8 μm, σ = 2.8 μm) containing 31.6% oil with 92.1% ME, 82.7% RE for carotenes and 94.3% RE for vitamin E, whereas those from spray drying were irregular-shaped particles (d = 16.6 μm, σ = 8.6 μm) containing 39% oil, 79% ME, and having similar RE values. The SEDS method allows microencapsulation of food oils prepared as o/w emulsions without thermal stress or organic solvents.
Journal of Food Engineering – Elsevier
Published: Apr 1, 2018
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