Page 8 - Pharmd general phytochemistry I-Final2024_LEUCTERS

(5) Insecticide and insect repellent effect:
 Citronella oil is used as mosquito repellent.

B-Internal applications:
� Essential oils are usually getting quicker into the blood-circulation
by inhalation than by oral application:

(1) Expectorating effect: effect (relief
Due to:
a- Secretolytic effect (lysis of secretion).
b- Secretomotor effect (moving the secretion).

� Volatile oil has a little broncho-spasmolytic
broncospam).

� Example: Peppermint, Anise, Thyme oils.

(2) Stimulation of secretions of digestive glands:
Essential oils are used because of their appetite stimulation, this is done
by stimulating the secretion of saliva and gastric enzymes and stimulating
the secretion of bile (choleretic effect).

(3) Carminative effect:
Anise fruits oil, basil, fennel, chamomile, coriander, caraway fruits, and
peppermint oil.

(4) Spasmolytic effect:
It is observed as relief of spasms of smooth muscles of intestines and
gall bladder. ex. Chamomile, caraway, fennel, orange and peppermint oil.

(5) Circulation stimulating effects:
Some V.O. has stimulating effect on the respiration and circulation
centers. Ex: Camphor, rosemary, lavender and peppermint oils.

Undesirable side effects of V.O:

1- Allergic effect:
V.O. have no allergic effect but upon storage, terpene hydrocarbons
(contain double bonds) (have no allergic effect) will be converted into
terpene hydroperoxides (have allergic effect).

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