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

Triacylglycerol chromatograms in vegetable oils (application volume to gas chromatograph = 1 μL): A) peanut oil, B) corn oil, C) olive oil, and D) soy oil.

Triacylglycerol chromatograms in animal fats (application volume to gas chromatograph = 1 μL): A) fish oil, B) raw milk, C) pork lard, and D) bovine tallow.

Groups classified by discriminant function: 1 = samples of authentic milk fat, 0% adulteration; 2 = samples of adulterated milk fat at 5%; 3 = samples of adulterated milk fat at 10%; 4 = samples of adulterated milk fat at 15%; and 5 = samples of adulterated milk fat at 20%.