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37-0.55% and 0.46-0.79% for the relative migration time, and 2.51-4.12% and 3.65-4.91% for the peak area, respectively. In whey protein analysis, the detection limits of β-Lg and α-Lac analysis were 5 mg L-1 and 3 mg L-1, respectively and the relative standard deviations (RSD%, n = 5) of intraday and interday analysis were 0.29-0.31% and 0.43-0.48% for the migration time and 2.89-3.25% and 3.29-4.18% for the peak area, respectively. The content of four major metal cations and two whey proteins in various types of milk samples was obtaine