Page 162 - phytochemistry I - PharmD Clinical
P. 162
Hydrolysis:
It contains the cardiac glycoside scillaren which upon hydrolysis yields
the aglycone scillarenin and one glucose and one rhamnose molecules.
Uses:
• Emetic
• Expectorant
• Cardiac tonic and diuretic
Chemical tests:
- Color reactions due to the aglycone moiety:
1- Reactions due to the steroidal nucleus:
These are positive with any compound containing a steroidal nucleus
including cardenolides and bufadienolides:
- Liebermann’s test: Cardiac glycosides in glacial acetic acid + H2SO4 →
red, violet, blue to green.
2- Reactions due to the (-CH2-) group of the lactone ring: These are
characteristic for cardenolides having a 5-membered lactone ring.
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