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BACKGROUND An ultra performance liquid chromatography-tandem mass spectrometry method with calibration traceable to NIST SRM was developed and validated to measure concentrations of 25-hydroxyvitamin(More)
BACKGROUND Measurement of vitamin D molecules are important in the management of patients with bone disease. We developed a liquid chromatography-tandem mass spectrometry (LC-MS/MS) method to measure(More)
Essential to the conduct of epidemiologic studies examining aflatoxin exposure and the risk of heptocellular carcinoma, impaired growth, and acute toxicity has been the development of quantitative(More)
A method for quantitative analysis of aflatoxin B1-lysine adduct (B1-Lys) in serum by liquid chromatography using tandem mass spectrometry (LC/MS/MS) is presented. The protein in a 250-microL sample(More)