HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Interpretive Summary Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Gutiérrez, R. Articles by Schettino, B. Search for Related Content PubMed PubMed Citation Articles by Gutiérrez, R. Articles by Schettino, B.

Detection of non-milk fat in milk fat by gas chromatography and linear discriminant analysis

R. Gutiérrez^*,1, S. Vega^*, G. Díaz^*, J. Sánchez, M. Coronado^*, A. Ramírez^*, J. Pérez^*, M. González^* and B. Schettino^*

^* Departamento de Producción Agrícola y Animal, and
Departamento del Hombre y su Ambiente, Universidad Autónoma Metropolitana Unidad Xochimilco, Calz. Hueso 1100, Villa Quietud, 04960 Coyoacán, México D.F. México

¹ Corresponding author: reygut{at}correo.xoc.uam.mx

Gas chromatography was utilized to determine triacylglycerol profiles in milk and non-milk fat. The values of triacylglycerol were subjected to linear discriminant analysis to detect and quantify non-milk fat in milk fat. Two groups of milk fat were analyzed: A) raw milk fat from the central region of Mexico (n = 216) and B) ultrapasteurized milk fat from 3 industries (n = 36), as well as pork lard (n = 2), bovine tallow (n = 2), fish oil (n = 2), peanut (n = 2), corn (n = 2), olive (n = 2), and soy (n = 2). The samples of raw milk fat were adulterated with non-milk fats in proportions of 0, 5, 10, 15, and 20% to form 5 groups. The first function obtained from the linear discriminant analysis allowed the correct classification of 94.4% of the samples with levels <10% of adulteration. The triacylglycerol values of the ultrapasteurized milk fats were evaluated with the discriminant function, demonstrating that one industry added non-milk fat to its product in 80% of the samples analyzed.

Key Words: gas chromatography • linear discriminant analysis • non-milk fat • milk fat