Page 15 - Pharmd general phytochemistry I-Final2024_LEUCTERS

a) Using volatile solvent:

Usually light petroleum is used by percolation.
- The solvent used must be:

� Completely and quickly dissolve all the odoriferous principles.
� Low boiling point.
� Immiscible with water.
� Chemically inert.
� Low priced.

b) Using non- volatile solvent:

i. Enfleurage method (Extraction with cold fat):
The principles of enfleurage:
Certain flowers continue the physiological activities of developing and
giving off perfume even after picking. ex. Jasmine flowers. Fat possesses
a high power of absorption of the perfume emitted.
- In the enfleurage process, a fat base (lard) “Corps” is spread in a thin
layer on both sides of a glass plate supported on a rectangular wooden
frame "Chassis". Batches of fresh flowers are lightly layered over the fat
base.
Several chassis are placed one above the other so that the flowers get
sandwiched between two layers of fat which absorbs the perfume as it is
given off.
Exhausted flowers are removed and called "De flèurage" and replaced by
the fresh flowers until the fat is relatively saturated with flower oil.
The perfumed fat must then be removed from the glass plates, and called
“Pomade".
The most highly saturated pomade being "Pomade 36" means the chassis
has been treated with fresh flowers 36 times during the whole process of
enfleurage.

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