Abstract
The fresh leaves of pineapple mint (Mentha rotundifolia ‘variegata’) were dried by air-drying at ambient temperature (22°C) and oven-drying at 60°C. The essential oils of each treatment were isolated by hydrodistillation (HD) and analysed by GC-MS and retention index comparison. The results showed that the yields of the oils were significantly affected by the drying methods. Higher oil yields by air-drying at 22°C was obtained when compared with oven-drying (0.63 % and 0.31 %, respectively), while the effect of drying methods on the chemical components of the essential oils were not significantly different. Thirty-three and thirty-one components, (99.06 % and 98.75 % of the total oils, respectively), were identified from the two oils. The main components were cis-jasmone (36.77 % by air-drying, 32.43 % by oven-drying), germacrene D (11.89 %, 10.88 %), β-ocimene (10.51 %, 11.27 %), viridiflorol (8.20 %, 8.47 %), octenyl acetate (6.41 %, 6.74 %), and β-farnesene (4.22 %, 5.66 %).
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