title: Semicarbazide in Canadian bakery products.
abstract: Levels of semicarbazide were determined by liquid chromatography-tandem mass spectrometry using isotope dilution ((13)C(15)N(2)-semicarbazide) methodology, and they were measured, after hydrolysis in 0.125 M hydrochloric acid and derivatization with 2-nitrobenzaldehyde, as a sum of free and bound semicarbazide. Levels of semicarbazide in 11 bakery products, which were sampled at three time intervals from the same source, varied from not detected (<1ng g(-1)) to 560 ng g(-1). In some instances, concentrations of semicarbazide varied between batches of the same product, at times more than tenfold, suggesting that the addition of azodicarbonamide to the same product is not standardized in many baking establishments.
authors.affiliation: Food Research Division, Bureau of Chemical Safety, Health Products and Food Branch, Health Canada, Ottawa, Ontario, Canada. adam_becalski@hc-sc.gc.ca
authors.forename: A
authors.initials: A
authors.lastname: Becalski
authors.forename: B P-Y
authors.initials: BP
authors.lastname: Lau
authors.forename: D
authors.initials: D
authors.lastname: Lewis
authors.forename: S
authors.initials: S
authors.lastname: Seaman
mesh_terms: D001391:Azo Compounds / Q000032:analysis; D001939:Bread / Q000032:analysis*; D002170:Canada; D002273:Carcinogens / Q000032:analysis*; D005506:Food Contamination / Q000032:analysis; D005511:Food Handling / Q000379:methods; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D006868:Hydrolysis; D012663:Semicarbazides / Q000032:analysis*
chemical_list: D001391:Azo Compounds; D002273:Carcinogens; D012663:Semicarbazides; C010059:carbamylhydrazine; C004525:azodicarbonamide