Abstract
The microwave-assisted hydrodistillation (MHD) and traditional hydrodistillation (HD) were compared and evaluated for their efficiency in the isolation of Kaempferia galanga L. essential oil. The optimum conditions for MHD were: microwave delivered power 1000 W, microwave radiation time 3 min. and a 1:25 ratio of material to water. The obtained oils were analyzed by GC and GC-MS. Forty-two components were identified in MHD oil and forty-five components in HD oil. Among the identified volatile compounds from K. galanga, the main components from both oils were found to be similar, but their contents were significantly different including iso-amyl p-methoxycinnamate (42.8 %, 27.5 %), n-pentadecane (21.6 %, 32.8 %), ethyl cinnamate (16.1 %, 17.1 %), cyperene (2.0 %, 3.4 %) and p-methoxystyrene (1.6 %, 2.6 %) in MHD oil and HD oil, respectively.
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