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A method to determine lactose in dairy products by high-performance liquid chromatography is described. Samples suitable for assay were prepared from the liquid state by deproteinization with trichloroacetic acid (6% wt/vol, final concentration). Lactose was separated by injection of the deproteinized sample onto a //Bondapak/Carbohydrate 3 column and isocratic elution with an acetonitrile/water mobile phase. Detection was with a differential refractometer. Sequential injection of a lactose standard and sample, addition of a standard quantity of lactose to the sample, and addition of an internal standard (xylose) to the sample were techniques for quantitation.
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Euber et al. (1979) studied this question.
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