title: Fatty acids and fat-soluble vitamins in ewe's milk predicted by near infrared reflectance spectroscopy. Determination of seasonality.
abstract: The aim of the present work was to determine the fatty acid and fat-soluble vitamin composition and the season of ewe's milk production using NIR spectroscopy. 219 ewe's milk samples from different breeds and feeding regimes were taken each month over one year. Fatty acids were analyzed by gas chromatography, and retinol and α-, and γ-tocopherol by liquid chromatography. The results showed that the quantification was more accurate for the milk dried on paper, except for vitamins. Calibration statistical descriptors on milk dried on paper were good for capric, lauric, myristic, palmitoleic, stearic and oleic acids, and acceptable for caprilic, undecanoic, 9c, 11tCLA, ΣCLA, PUFA, ω3, ω6, retinol and α-tocopherol. The equations for the discrimination of seasonality was obtained using the partial least squares discriminant analysis (PLSDA) algorithm. 93% of winter samples and 89% of summer samples were correctly classified using the NIR spectra of milk dried on paper.
authors: Food Technology, University of Salamanca, E.P.S. de Zamora, Avda. Requejo 33, 49022 Zamora, Spain. Electronic address: irevilla@usal.es.
authors: I
authors: I
authors: Revilla
authors: Departament of Vegetal Biology and Soil Sciences, Faculty of Sciences, University of Vigo, As Lagoas, 32004 Ourense, Spain.
authors: O
authors: O
authors: Escuredo
authors: Department of Analytical and Food Chemistry, Faculty of Chemistry, University of Salamanca, Plaza de la Merced, 37008 Salamanca, Spain.
authors: M I
authors: MI
authors: González-Martín
authors: Animal Production, University of Salamanca, Faculty of Environmental Sciences, Avda. Filiberto Villalobos, 119-129 Salamanca, Spain.
authors: C
authors: C
authors: Palacios
mesh_terms: D000818:Animals; D005227:Fatty Acids / Q000032:analysis*; D005260:Female; D008892:Milk / Q000737:chemistry*; D012621:Seasons; D012756:Sheep; D019265:Spectroscopy, Near-Infrared / Q000379:methods*; D014801:Vitamin A / Q000032:analysis; D014815:Vitamins / Q000032:analysis*; D024502:alpha-Tocopherol / Q000032:analysis
chemical_list: D005227:Fatty Acids; D014815:Vitamins; D014801:Vitamin A; D024502:alpha-Tocopherol
keywords: Discriminant partial least squares; Fatty acids; Milk; Retinol; Tocopherol