Effect of ultrasonic pretreatment on kaffir lime leaves extraction using hydrodistillation

Objective of this study is to extract essential oil from the kaffir lime leaves by using the hydrodistillation method. The effects of ultrasonic pretreatment on kaffir lime leaves was also investigated then analyze and identify the components of essential oil in kaffir lime leaves using gas chromatography mass spectrometry (GC-MS).The experiment was conducted with varies of time in ultrasonic pretreatment range for 0 to 120 minutes. The essential oil was extracted within 4 hours using hydrodistillation. The longer time taken of pretreatment will produce higher yield of essential oil collected. The highest yield is 0.818 % with 60 min of pretreatment using ultrasonic. Within the range for 0-60 min of ultrasonic pretreatment, the yield of essential oils increase as the pretreatment increased.