title: Correlation of geographical location with stable isotope values of hydrogen and carbon of fatty acids from New Zealand milk and bulk milk powder.
abstract: The aim of this study was to investigate the correlation of δ²H and δ¹³C of bulk milk powder and milk powder fatty acids to their production region. A total of 46 milk powder samples from across New Zealand were collected and analyzed. Principal component analysis (PCA) showed that the δ²H and δ¹³C of four fatty acids (C4:0, C14:0, C16:0, C18:1) and bulk milk powder were found to be correlated with regional production area. Linear discriminant analysis (LDA) models were prepared using different combinations of bulk and fatty acid δ²H and δ¹³C. All models were effective in discriminating samples from the North and South Islands. The LDA model using just fatty acid δ²H and δ¹³C provided the best separation. Therefore, the isotopic composition of the aforementioned fatty acids can be utilized as a good biomarker in milk powder that conveys reliable isotopic information to track milk powders to their regional origin.
authors: Department of Chemistry, University of Otago , P.O. Box 56, Dunedin, New Zealand.
authors: Emad
authors: E
authors: Ehtesham
authors: Alan R
authors: AR
authors: Hayman
authors: Kiri A
authors: KA
authors: McComb
authors: Robert
authors: R
authors: Van Hale
authors: Russell D
authors: RD
authors: Frew
mesh_terms: D000818:Animals; D002247:Carbon Isotopes / Q000737:chemistry*; D002417:Cattle; D003903:Deuterium / Q000032:analysis*; D005227:Fatty Acids / Q000032:analysis*; D005843:Geography; D008892:Milk / Q000737:chemistry*; D009520:New Zealand; D011208:Powders / Q000737:chemistry
chemical_list: D002247:Carbon Isotopes; D005227:Fatty Acids; D011208:Powders; D003903:Deuterium