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Trace-Level Analysis of Melamine in Milk Products on Agilent 7890A/5975C GC/MSD Using a New Agilent J&W DB-5ms Ultra Inert Column and SampliQ SCX Cartridges

Abstract: GC/MS method is presented for the quantitative determination and confirmation of melamine residues in milk products. The milk sample was cleaned up using Agilent’s new SampliQ SCX SPE cartridges before derivatization. The derived extracts were analyzed by GC/MS with EI in synchronous SIM/scan mode on a new Agilent J&W DB- 5ms Ultra Inert column. The method has good linearity in the range of 0.025 to 2.000 μg/mL with a correlation coefficient of 0.9986. The average recoveries of melamine, for milk spiked at 0.080, 0.800, and 1.600 mg/kg, were over 80 percent, with RSDs of less than 5 percent. The LOD is 0.0025 mg/kg in the milk matrix, which is suitable for trace-level analysis of melamine in milk products.

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