Development of a Mitra Tip Extraction Assay Coupled with LC-MSMS
Biomarkers such as L-Citrulline, L-Arginine, and L-Argininosuccinic Acid play crucial roles in various physiological processes and pathological conditions. However, their accurate quantitation presents challenges due to sample complexity and low concentrations. Here, we present a novel approach utilizing Mitra tip extraction coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS) for the simultaneous quantitation of these biomarkers. Mouse models are known to produce small blood volumes while Mitra tips offer advantages in sample collection, allowing for convenient and reproducible extraction from biological matrices.
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A Derivatization-free LCMS Assay for 4β-hydroxycholesterol
In clinical studies, 4β-hydroxycholesterol is an important biomarker for assessing the activity of CYP3A. Numerous quantitative methods have been reported for analyzing the total amount of 4β-hydroxycholesterol (free and conjugated) after saponification and derivatization. Derivatization is often required to achieve clinically relevant assay sensitivity when utilizing LCMS for detection, but this additional step can be complex and time-consuming.
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