Page 28 - Phytochemistry 2 (06-PG 605)
P. 28
Mescaline is determined by colorimetric methods that are based on the colors
produced by reaction with p-nitrophenyldiazonium
chloride, picric acid and bromocresol purple
4- Capsicum alkaloids
Capsaicine
Capsaicine is the strongly pungent principal isolated from the fruits of Capsicum
species. (Fam. Solanaceae). O
MeO Me
N
H
HO Me
- It is a phenolic amide alkaloid Capsicin
- Capsaicin is a neutral alkaloid (does not possess basic characters), due to the
presence of nitrogen in an amide group.Therefore,it can be extracted with
organic solvents from acid medium.
• Capsaicin imparts a pungent taste to water The pungency is destroyed by
oxidation (KMnO4).
Uses
Capsicum is used externally as a counter-irritant in the form of ointment and
plaste for the relief of rheumatism, lumbago
II Tropolone alkaloids
7 membered unsaturated ring structure (Tropolone)
Colchicine MeO AB O
Sources: MeO OMe C NH - C - CH3
O
seeds of Colchicum autumnale(LiliaceaOe-)M.e
properties:
It is an amorphous yellowish- white powder.
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