Effect of heat treatment methods on the content of remaining essential oils in products mixed with lemongrass essential oil microencapsulation powder (Cymbopogon citratus)

Abstract

In this study, lemongrass essential oil microencapsulation powder (Cymbopogon citratus) was successfully implemented by spray drying technology. A number of thermal processing processes were conducted to determine the retention of lemongrass essential oil during processing, including: steaming, frying, and baking. The properties of microencapsulation powder are evaluated through the retention of lemongrass essential oil. The wall material used in this study was maltodextrin because of its good properties in water solubility and its ability to store active substances inside. The results have shown that the change of microencapsulation powder concentration did not significantly affect the color of the cake after processing. Oil returning efficiency was the highest when mixed with 10% microencapsulation powder. Analysis of gas chromatography - mass spectrometry (GC-MS) has shown that the main component of lemongrass essential oil were two isomers of Citral (Z-Citral and E-Citral), which were retained after processing.