title: Ion mobility spectrometry of volatile compounds from Iberian pig fat for fast feeding regime authentication.
abstract: Characteristic ion mobility spectra for volatile compounds present in fat were used to authenticate the feeding regime of Iberian pigs. Volatile compounds were obtained by heating the solid samples at 150 degrees C for 40 min. This produced a headspace that was introduced in the spectrometer ionization chamber by means of a highly purified nitrogen stream. The spectra thus, obtained for the fat samples were processed chemometrically in order to assess their usefulness for discriminating meat from free-range pigs fed on pasture and acorns and confined pigs fed with commercial feed including high-oleic acid products. Principal component analysis was used as both an exploratory tool and a variable reduction method, and linear discriminant analysis was employed to classify 65 subcutaneous fat samples according to pig feeding regime. Only 2.3% of the samples from pigs reared in confinement were misclassified. 95.5% of the free-range samples were correctly predicted.
authors.affiliation: Department of Analytical Chemistry, University of Córdoba, Annex C3 Building, Campus of Rabanales, E-14071 Córdoba, Spain.
authors.forename: Ruth
authors.initials: R
authors.lastname: Alonso
authors.forename: Vicente
authors.initials: V
authors.lastname: Rodríguez-Estévez
authors.forename: Ana
authors.initials: A
authors.lastname: Domínguez-Vidal
authors.forename: Maria José
authors.initials: MJ
authors.lastname: Ayora-Cañada
authors.forename: Lourdes
authors.initials: L
authors.lastname: Arce
authors.forename: Miguel
authors.initials: M
authors.lastname: Valcárcel
mesh_terms: D000821:Animal Feed / Q000592:standards*; D000818:Animals; D013057:Spectrum Analysis / Q000379:methods / Q000592:standards*; D050151:Subcutaneous Fat / Q000737:chemistry*; D013552:Swine; D014835:Volatilization