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- W2399559315 abstract "Analysis of serum/plasma methylmalonic acid (MMA) is important for the diagnosis and management of methylmalonic acidemia in pediatric populations. This work focuses on developing and validating a liquid chromatography tandem mass spectrometry (LC-MS/MS) method to monitor methylmalonic acidemia using a simple method preparation.MMA and stable isotope labeled d3-MMA was extracted using supported liquid extraction (SLE). Assay imprecision, bias, linearity, recovery and carryover were determined. The relationship between MMA and propionyl acylcarnitine (C3-acylcarnitine) was also evaluated using historical paired results from 51 unique individuals.Baseline separation between MMA and succinic acid was completed in 7min. The assay was linear from 0.1 to 500μM. The intra-day and inter-day imprecision CV ranged from 4.1 to 13.2% (0.3 to 526μM) and 5.0 to 15.7% (0.3 to 233μM), respectively. Recovery ranged from 93 to 125%. The correlation with a national reference laboratory LC-MS/MS assay showed a Deming regression of 1.026 and intercept of -1.335. Carryover was determined to be <0.04%. Patient-specific correlation was observed between MMA and C3-acylcarnitine.This report describes the first LC-MS/MS method using SLE for MMA extraction. In addition, we illustrate the challenges encountered during this method development that should be assessed and resolved by any laboratory implementing a SLE LC-MS/MS assay designed to quantify analytes across several orders of magnitude." @default.
- W2399559315 created "2016-06-24" @default.
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- W2399559315 date "2016-09-01" @default.
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- W2399559315 title "Quantifying MMA by SLE LC-MS/MS: Unexpected challenges in assay development" @default.
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- W2399559315 doi "https://doi.org/10.1016/j.clinbiochem.2016.05.010" @default.
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