title: Separation of carcinogenic fraction of bracken fern.
abstract: Isolation of the carcinogen in the boiling water extract of bracken fern was conducted by following the active principle with a carcinogenicity bioassay. Fractionation of the bracken extract was carried out using adsorption on resin (Amberlite XAD-2 and TOYOPEARL HW-40 (c] and organic solvent extraction. A diet containing each of the fractions was given to 7 female Charles River Sprague-Dawley rats (CD rats) of 4 weeks old, except for the second fraction. All 7 rats given the last carcinogenic fraction developed mammary and intestinal tumors and 5 rats had urinary bladder tumors. Ptaquiloside (PT) which induced mammary cancer in female CD rats and rho-hydroxystyrene glycosides were isolated from this fraction.
mesh_terms: D000818:Animals; D002273:Carcinogens / Q000302:isolation & purification*; D005260:Female; D008325:Mammary Neoplasms, Experimental / Q000139:chemically induced; D009374:Neoplasms, Experimental / Q000139:chemically induced; D010947:Plants, Toxic / Q000032:analysis*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D002273:Carcinogens