Isorhamnetin glycosides dominate in Opuntia ficus-indica fruits.
Flavonols in extrusion products fortified with cactus have been investigated.
Extruded products processed alone from rice or corn grits have no flavonol at all.
Extrusion cooking had no influence on the flavonol profile of Opuntia ficus-indica.
Flavonols serve as a fingerprint with regard to genuineness of cactus food products.