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Scanning electron microscopy (SEM) of oregano microcapsules at lower (A) and higher (B) resolution. Microcapsule formulation: wall material (10 g of gelatin, 7.5 g of gum Arabic, 1.99 g of Tween 20, 1.98 g of β-cyclodextrin) and 20 g of ethanolic oregano extract as the core. Spray-drying parameters: The inlet temperature—170 °C, feed flow rate—40 mL/min, concentration of wall material in solution—20%.
