Page 82 - Pharmacognosy-I (02-06-06-102)
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7- Fragments of the wall of ovary showing numerous
Compositous glandular hairs prismatic crystals of calcium
oxalate and schizogenous ducts with brown secretion.
8- Fragments of lignified, large, irregular moderately thick
walled sclereids from the receptacle.
Constituents:
Pyrethrum owes its insecticidal properties to esters called
pyrethrins. Pyrathin I, jasmolin I and cinerin I are esters of
chrysanthemic acid, while pyrethrin II, jasmolin II and cinerin II are
esters of pyrethric acid. The alcohol component of the pyrethrins is
the keto-alcohol pyrethrolone and of cinerins is the keto alcohol
cinerolone.
Ester Acid Alcohol
Pyrethrin I Chrysanthemic acid Pyrethrolone
Cinerin I Chrysanthemic acid Cinerolone
Jasmolin I Chrysanthemic acid Jasmolone
Pyrethrin II Pyrethric acid Pyrethrolone
Cinerin II Pyrethric acid Cinerolone
Jasmolin II Pyrethric acid Jasmolone
The pyrethrin content of the florets is located mainly in the
secretion present in the schizogenous ducts of the ovary wall and in
the glandular hairs.
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