Argemone mexicana

Argemone mexicana seeds contain 22–36% of a pale yellow non-edible oil, called argemone oil or katkar oil, which contains the toxic alkaloids sanguinarineand dihydrosanguinarine. Four quaternary isoquinoline alkaloids, dehydrocorydalmine, jatrorrhizine, columbamine, and oxyberberine, have been isolated from the whole plant of Argemone mexicana. Many other alkaloids such as argemexicaines A and B, coptisine, cryptopine, allocryptopine and chelerythrine have also been found in this plant. The seed pods secrete a pale yellow latex when cut open. This argemone resin contains berberine and protopine.