Historically, LC-MS/MS focused on synthetic drug pharmacokinetics. However, improved sensitivity now allows the analysis of endogenous biomarkers (lipids, proteins, etc.) previously reserved for Ligand Binding Assays (LBA). A primary challenge in biomarker bioanalysis is that these compounds are endogenous to biological matrices, and the matrix could present challenging physicochemical properties. Unlike conventional drug testing, there is no true blank matrix available to build calibration standards. To quantify these levels accurately, researchers must develop a surrogate matrix that mimics the behavior of authentic patient samples without the background interference of the natural analyte. Selecting and validating this surrogate is the most critical step in establishing a reliable LC-MS/MS method for any naturally occurring compound.
Download our poster, recently presented at WRIB 2026 to learn more.