title: Tracing the Geographical Origin of Onions by Strontium Isotope Ratio and Strontium Content.
abstract: The strontium (Sr) isotope ratio ((87)Sr/(86)Sr) and Sr content were used to trace the geographical origin of onions from Japan and other countries, including China, the United States of America, New Zealand, Australia, and Thailand. The mean (87)Sr/(86)Sr ratio and Sr content (dry weight basis) for onions from Japan were 0.70751 and 4.6 mg kg(-1), respectively, and the values for onions from the other countries were 0.71199 and 12.4 mg kg(-1), respectively. Linear discriminant analysis was performed to classify onions produced in Japan from those produced in the other countries based on the Sr data. The discriminant equation derived from linear discriminant analysis was evaluated by 10-fold cross validation. As a result, the origins of 92% of onions were correctly classified between Japan and the other countries.
authors.affiliation: Food and Agricultural Materials Inspection Center Kobe Regional Center.
authors.forename: Hisaaki
authors.initials: H
authors.lastname: Hiraoka
authors.forename: Sakie
authors.initials: S
authors.lastname: Morita
authors.forename: Atsunobu
authors.initials: A
authors.lastname: Izawa
authors.forename: Keisuke
authors.initials: K
authors.lastname: Aoyama
authors.forename: Ki-Cheol
authors.initials: KC
authors.lastname: Shin
authors.forename: Takanori
authors.initials: T
authors.lastname: Nakano
mesh_terms: D016002:Discriminant Analysis; D007564:Japan; D016015:Logistic Models; D013058:Mass Spectrometry; D019697:Onions / Q000737:chemistry* / Q000145:classification* / Q000254:growth & development; D013054:Spectrophotometry, Atomic; D013324:Strontium / Q000032:analysis*; D013325:Strontium Isotopes / Q000032:analysis
chemical_list: D013325:Strontium Isotopes; D013324:Strontium