Abstract
Compositional change in commercial lemon essential oil for application in aromatherapy was investigated under four different conditions over a oneyear period. Sample S-1 was stored in an incubator set at 25ºC with the cap open for 3 min everyday; sample S-2 was stored in an incubator set at 25ºC with the cap open once a month for analysis; samples S-3 and S-4 were stored at 5ºC in the same manner as S-1 and S-2, respectively. The oil samples were analyzed quantitatively using an internal standard by GC and GC-MS. Compositional changes occurred predominantly in S-1, where monoterpene hydrocarbons decreased from 97.1% to 30.7% in one year. The increase of p-cymene was associated with the decrease of γ-terpinene and citral. The compositional change in S-4 was minimal, while the aerobic condition (S-3) caused some decrease of the constituents during storage even at 5ºC.
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