Abstract
A comparison between properly stored and improperly stored (containing a small amount of water, half-filled in aluminum container and stored under ambient conditions) rose-scented geranium oil was made. It was found that the menthone, citronellol and citronellyl formate contents increased significantly under poor storage conditions, whereas linalool, geraniol, geranyl formate and lO-epi-γ-eudesmol contents decreased under poor storage conditions over the period of 6-24 months. When the oil was stored correctly, the concentrations of linalool, citronellol, citronellyl formate and 10-epi-γ-eudesmol did not vary markedly, while that of menthone increased slightly and those of geraniol and geranyl formate declined marginally. Correct storage conditions were defined as oil that has been dried over anhydrous sodium sulfate, filled up to the brim in an aluminum container or amber-colored bottle, tightly stoppered and stored under ambient conditions. No polymerization was observed in oils irrespective of storage conditions.
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