title: Determination of total iodine in French Polynesian foods: method validation and occurrence data.
abstract: Pacific Island populations show some of the highest incidences of thyroid cancer in the world, and iodine deficiency is suspected to play a role. Iodine content was determined in 124 different French Polynesian food samples using inductively coupled plasma-mass spectrometry after alkaline digestion. For samples containing starch, the method was optimised by including an additional enzymatic treatment step. This analytical method was validated with an accuracy profile approach, using certified reference materials with iodine contents ranging from 0.027 to 4.95mgiodinekg(-1) dry weight. The trueness bias ranged from -5.8% to 22.4% and the highest observed intermediate precision coefficient of variation CVR was 11% in starchy materials. Tested Polynesian foods showed large variation in iodine content, with values of 0.014-0.032mgkg(-1) for fruits, 0.014-0.081mgkg(-1) for starchy samples, 0.027-1.85mgkg(-1) for green vegetables, 0.222-5.19mgkg(-1) for fish, 6.51-85.6mgkg(-1) for shellfish, and 0.004-1.39mgkg(-1) for beverages.
authors.affiliation: University of Paris-Est, Anses, Maisons-Alfort Laboratory for Food Safety, Department of Chemical Contaminants in Food, Metallic Trace Elements and Minerals Unit, Maisons-Alfort, France.
authors.forename: Axelle
authors.initials: A
authors.lastname: Leufroy
authors.affiliation: University of Paris-Est, Anses, Maisons-Alfort Laboratory for Food Safety, Department of Chemical Contaminants in Food, Metallic Trace Elements and Minerals Unit, Maisons-Alfort, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Noël
authors.affiliation: IRSN/LESE, Laboratoire d'Étude et de Surveillance de l'Environnement, Papeete, Tahiti, French Polynesia.
authors.forename: Patrick
authors.initials: P
authors.lastname: Bouisset
authors.affiliation: INSERM, UMR1018, Radiation Epidemiology Group, Villejuif, France; Department of Biostatistics and Epidemiology, Gustave Roussy Institute, Villejuif, France; University of Paris-Sud 11, UMRS 1018, Villejuif, France.
authors.forename: Stéphane
authors.initials: S
authors.lastname: Maillard
authors.affiliation: IRSN/LESE, Laboratoire d'Étude et de Surveillance de l'Environnement, Papeete, Tahiti, French Polynesia.
authors.forename: Solène
authors.initials: S
authors.lastname: Bernagout
authors.affiliation: INSERM, UMR1018, Radiation Epidemiology Group, Villejuif, France; Department of Biostatistics and Epidemiology, Gustave Roussy Institute, Villejuif, France; University of Paris-Sud 11, UMRS 1018, Villejuif, France.
authors.forename: Constance
authors.initials: C
authors.lastname: Xhaard
authors.affiliation: INSERM, UMR1018, Radiation Epidemiology Group, Villejuif, France; Department of Biostatistics and Epidemiology, Gustave Roussy Institute, Villejuif, France; University of Paris-Sud 11, UMRS 1018, Villejuif, France.
authors.forename: Florent
authors.initials: F
authors.lastname: de Vathaire
authors.affiliation: University of Paris-Est, Anses, Maisons-Alfort Laboratory for Food Safety, Department of Chemical Contaminants in Food, Metallic Trace Elements and Minerals Unit, Maisons-Alfort, France. Electronic address: thierry.guerin@anses.fr.
authors.forename: Thierry
authors.initials: T
authors.lastname: Guérin
mesh_terms: D000818:Animals; D001628:Beverages / Q000032:analysis*; D005504:Food Analysis / Q000379:methods; D005638:Fruit / Q000737:chemistry*; D007455:Iodine / Q000032:analysis*; D013058:Mass Spectrometry / Q000379:methods; D011114:Polynesia; D017747:Seafood / Q000032:analysis*; D014675:Vegetables / Q000737:chemistry*
chemical_list: D007455:Iodine
keywords: Alkaline extraction; Food samples; ICP-MS; Iodine determination; Method validation