14. DETERMINATION OF CEDROL CONTENT OF CEDARWOOD OILS
For the determination of cedrol in cedarwood oils,
Rabak174 has suggested the following method :
One hundred parts of oil are agitated vigorously
with 6 parts of 65% alcohol (by volume) for one to two minutes in a widemouthed,
stoppered flask. Sudden and complete solidifications of the emulsion thus formed
usually result if the oil contains a sufficient quantity of cedrol. If it fails
to solidify, add a small quantity of crystalline cedrol to the emulsion, and cool
in a refrigerator for several hours. Filter the solidified mass with the aid of
a well cooled Blichner funnel and wash the fine silky crystals with a few drops
of cold 98% alcohol. Weigh the dry crystals. The cedrol may be purified by dissolving
it in hot alcohol, then cooling and filtering the mass.
In general, an analytical method based upon the
actual separation of a constituent by physical means will not give completely accurate
results. However, comparative data may be obtained provided all experimental conditions
are carefully controlled.
This method appears to be of value only for obtaining
comparative data when two oils are examined simultaneously; all experimental conditions
should be maintained as identical as possible.
-----------------------
174 Am. Perfumer 23 (1929), 727.
0 Comment:
Post a Comment