An ultrasensitive method for the quantitation of active and inactive GLP-1 in human plasma via immunoaffinity LC-MS/MS

Background: Measuring endogenous levels of incretin hormones, like GLP-1, is critical in the development of antidiabetic compounds. However, the assays used to measure these molecules often have analytical issues. Results: We have developed an ultrasensitive, highly-selective immunoaffinity LC–MS/MS (IA LC–MS/MS) assay capable of quantitating endogenous levels of active (7–36 amide) and inactive (9–36 amide) GLP-1 in human plasma. We performed fit-for-purpose validation of the assay by assessing the following assay performance characteristics: inter-assay precision, sensitivity, spike recovery, dilution linearity, absolute recovery, matrix effect, immunoprecipitation efficiency, and food effect. Conclusion: We have developed a robust analytical method for the quantitation of...