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Abstract
This study investigates some conditions for encapsulating Asian chives (Allium tuberosum Rottl. Ex Spreng) essential oil using spray drying technique, including: (i) the carriers of α-cyclodextrin (α-CD), γ-cyclodextrin (γ-CD), α-CD and maltodextrin (MD) mixture (2:1 ratio) and γ-CD and MD mixture (2:1 ratio); (ii) the proportion of chive essential oil added is 1, 2, 5 and 8%; (iii) spray drying temperatures are 150, 160, 170 and 180ºC. The microencapsulation process uses a spray dryer with a centrifugal nozzle (pumping speed 30 ml/min, rotating disc speed 22,000 rpm). The quality of the microencapsulated powder is evaluated based on its moisture content, solubility, encapsulation efficiency, and antioxidant properties. The results showed that the carrier mixture γ-CD: MD (ratio 2:1), additional essential oil ratio of 5% and spray drying temperature of 170ºC gave the highest microencapsulation efficiency of 91.84%. Under this condition, the powder has a moisture content of 1.87%, a solubility of 91.84%, powder particles are spherical with a smooth or concave surface, size (photographed by scanning electron microscope) 5 – 70 µm, and is resistant to oxidation (IC50 = 62.24 µg/ml). The sulfide compound in the powder was identified as dimethyl trisulfide.
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