Determination of ethanol-soluble extractive
The ground sample (5.0 g) was macerated with
absolute ethanol (100.0 ml) in a closed conical flask in
shaking bath for 6 hours and allowed to stand for 18
hours. The extract was filtered rapidly to avoid loss of
ethanol. The filtrate (20.0 ml) was evaporated to dryness
in a tared small beaker and then dried with heat to
constant weight.
Determination of water-soluble extractive
The ground sample (5.0 g) was macerated with
distilled water (100.0 ml) in a closed conical flask in
shaking bath for 6 hours and allowed to stand for 18
hours. The extract was filtered, and the filtrate (20.0 ml)
was evaporated to dryness in a tared small beaker and
dried at 105°C to constant weight.
Determination of loss on drying
The ground sample (5.0 g) was accurately weighed
in a tared small beaker and then dried at 105°C to
constant weight.
Determination of water content
The ground sample (50.0 g) in water-saturated
toluene (200.0 ml) was subjected to azeotropic
distillation. As soon as the water was completely distilled,
the inside of the condenser tube was rinsed with toluene,
and the distillation was continued for 5 more minutes.
The heat was then removed, and the receiving tube was
allowed to cool to room temperature. The water and
toluene layers were allowed to separate, and then the
volume of water was read off.
Determination of volatile oil content
Volatile oil distillation was performed on the ground
sample (100.0 g) in water (600.0 ml) using a clevenger
apparatus. When the distillation was complete, the heat
was removed, and the receiving tube was allowed to
cool to room temperature. The volatile oil and water
layers were allowed to separate, and then the volume of
volatile oil was read off.
Thin-layer chromatographic identification
The ground sample (1 g) was macerated with
methanol (20 ml) of for 12 hours. The extract was filtered
and evaporated to dryness. The residue was dissolved in
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