Page 137 - Pharmacognosy-I (02-06-06-102)
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• The bark has unpleasant odour and taste, it acts as an emetic. Those
properties are lost when the bark is dried and kept; therefore
frangula bark should not be employed medicinally until it has been
kept for at least one year.
• In the fresh bark, anthraquinones are not present, but exist as their
reduced form which are converted by oxidation during drying and
storage, or by accelerated heat and air treatment
Microscopic characters :
The T.S. closely resembles that of Cascara but groups of sclereids are
absent.
T.S. of Frangula bark
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