Encapsulation efficiency and thermal stability of lemongrass (Cymbopogon citratus) essential oil microencapsulated by the spray-drying process
2021
Nguyen, P. T. N. | Vo, T. T. | Tran, T. Y. N. | Le, T. H. N. | Mai, H. C. | Tran, T. T. | Long, G. B.
Encapsulation is a potential technique that is widely studied and applied in the preservation of biological compounds and living cells. Lemongrass (Cymbopogon citratus) essential oil is a biological compound that emits a strong aroma and contains robust antibacterial compounds, hence its applications in various areas such as food, pharmaceuticals and cosmetics. However, lemongrass essential oil is in a liquid form, so it is easy to evaporate and oxidize when being exposed to temperature variations, oxygen, and light. Hence, the present study was aimed to determine the effects of heating temperature and time on the stability of microencapsulated lemongrass essential oil powder. In this research, microencapsulated powder was produced by the spray-drying method using maltodextrin (30%, w/w) as the wall material and lemongrass (1.5%, w/w) as the core material. Thereafter, the effects of heat during processing, including temperature (60°C to 180°C) and treatment time (from 20 to 80 mins) were evaluated. The results showed that when the temperature and the time increased, the color of powder became darker and OR values were rapidly reduced. The selected optimal temperature and time was 100°C and 20 mins. The encapsulated essential oil maintained its main components including nerol, citral a, citral b, and geraniol, even after being heated.
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