Ghelardini C, Galeotti N, Mazzanti G
Planta Medica, 2001
ABSTRACT:
The local anaesthetic activity of a number of compounds with different structures, contained in essential oils, was studied. Anaesthetic activity was evaluated in vivo in the rabbit conjunctival reflex test and in vitro in a rat phrenic nerve-hemidiaphragm technique. Among the substances tested terpineol and trans-anethole (10(-3) – 1 microg/ml) were able to drastically reduce the electrically evoked contractions of rat phrenic nerve-hemidiaphragm in a concentration-dependent manner, but not eugenol, (-)- and (+)-citronellal, (-)- and (+)-carvone, trans cinnamaldehyde and alpha-terpinene. In the rabbit conjunctival reflex test, the treatment with a solution of terpineol and trans-anethole (10 – 100 microg/ml) effected a concentration-dependent increase in the number of stimuli required to evoke the reflex, thus confirming in vivo the local anaesthetic activity observed in vitro. Eugenol, (-)- and (+)-citronellal, trans-cinnamaldehyde, (-)- and (+)-carvone and alpha-terpinene were as ineffective in the in vivo test as they were in the in vitro results.
CITATION:
Ghelardini C, Galeotti N, Mazzanti G. Local anaesthetic activity of monoterpenes and phenylpropanes of essential oils. Planta Med. 2001;67(6):564-566.
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