title: Adulteration of Argentinean milk fats with animal fats: Detection by fatty acids analysis and multivariate regression techniques.
abstract: The aims of the present study were to test the accuracy of the fatty acid ratios established by the Argentinean Legislation to detect adulterations of milk fat with animal fats and to propose a regression model suitable to evaluate these adulterations. For this purpose, 70 milk fat, 10 tallow and 7 lard fat samples were collected and analyzed by gas chromatography. Data was utilized to simulate arithmetically adulterated milk fat samples at 0%, 2%, 5%, 10% and 15%, for both animal fats. The fatty acids ratios failed to distinguish adulterated milk fats containing less than 15% of tallow or lard. For each adulterant, Multiple Linear Regression (MLR) was applied, and a model was chosen and validated. For that, calibration and validation matrices were constructed employing genuine and adulterated milk fat samples. The models were able to detect adulterations of milk fat at levels greater than 10% for tallow and 5% for lard.
authors: Instituto de Lactología Industrial [INLAIN-UNL/CONICET], Santiago del Estero 2829, Santa Fe CP 3000, Argentina. Electronic address: srebechi@fiq.unl.edu.ar.
authors: S R
authors: SR
authors: Rebechi
authors: Instituto de Lactología Industrial [INLAIN-UNL/CONICET], Santiago del Estero 2829, Santa Fe CP 3000, Argentina.
authors: M A
authors: MA
authors: Vélez
authors: Departamento de Matemática (FBCB/UNL), Ciudad Universitaria, Santa Fe CP 3000, Argentina.
authors: S
authors: S
authors: Vaira
authors: Instituto de Lactología Industrial [INLAIN-UNL/CONICET], Santiago del Estero 2829, Santa Fe CP 3000, Argentina.
authors: M C
authors: MC
authors: Perotti
mesh_terms: D000818:Animals; D001118:Argentina; D002849:Chromatography, Gas / Q000379:methods; D004041:Dietary Fats / Q000032:analysis; D005223:Fats / Q000032:analysis; D005227:Fatty Acids / Q000032:analysis*; D005506:Food Contamination / Q000032:analysis*; D008892:Milk / Q000737:chemistry*; D015999:Multivariate Analysis; D012044:Regression Analysis; D015203:Reproducibility of Results
chemical_list: D004041:Dietary Fats; D005223:Fats; D005227:Fatty Acids; C013698:tallow; C029310:lard
keywords: Adulteration; Milk fat; Multiple Linear Regression