The oils of 14 samples of Lippia glandulosa collected in the “Lavrado” area, Roraima state, North Brazil, were obtained by hydrodistillation and analyzed by GC and GC/MS. Two chemical groups were characterized in the oils, one which was rich in thymol (46.3–78.1%), and another containing β-caryophyllene (17.3–59.4%) as the major component. In the first group the compounds p-cymene (5.1–7.2%) and β-caryophyllene (4.1–9.2%) have been associated to thymol in six of the analyzed oil samples. On the other hand, the second group showed variable association with (E)-nerolidol (0.7–23.6%), trans-α-bergamotene (0.2–19.3%), α-alaskene (3.4–16.0%), α-pinene (1.2–7.8%), α-hu-mulene (2.6–6.0%), caryophyllene oxide (1.9–6.0%) and linalool (0.9–5.0%), in the other eight oil samples, justifying the field observation concerning the plant scent variability at the same collection site and the chemical composition differentiation observed to L. glandulosa.
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Maia et al. (2005) studied this question.
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