Page 31 - phytochemistry general program
P. 31
Tests for identification
Mescaline gives with Marquis' reagent an orange color. .1
Mescaline gives with ammonium molybdate a green color that turns to blue. .2
Quantitative determination
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 -Capsicin It is a phenoMleic amide alkaloid
- 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 .1
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)
MeO AB O Colchicine
MeO NH - C - CH3 Sources:
OMe C
O
O 2- 9Me
