Determination of Very Low Abundance Diagnostic Proteins in Serum Using Immunocapture LC–MS/MS
July 1st 2017There is growing interest in the determination of endogenous proteins in biological samples for diagnostic purposes, because a concentration increase or decrease of such proteins can allows us to monitor the state of a pathological condition such as cancer. Immunocapture LC–MS/MS analysis combines the workflow of conventional immunological assays with LC–MS analysis. This article describes typical challenges, such as cross reactivity and the mass spectrometer’s dynamic range, as well as the advantages of isoform differentiation and multiplexing.
Determination of Very Low-Abundance Diagnostic Proteins in Serum Using Immuno-Capture LC–MS/MS
November 1st 2016The use of antibodies in “bottom-up” LC–MS workflows to determine low abundant biological active proteins in complex human samples has increased in recent years: immuno-capture analysis combines the workflow of conventional immunological assays with LC–MS analysis. This paper describes typical challenges, such as cross reactivity and the mass spectrometer’s dynamic range, as well as the advantages of isoform differentiation and multiplexing. Additionally, some experimental formats of immuno-capture bottom-up LC–MS analysis of biological active proteins in complex human samples will be discussed.
Determination of Very Low-Abundance Diagnostic Proteins in Serum Using Immuno-Capture LC–MS–MS
July 1st 2016The use of antibodies in “bottom-up” LC–MS workflows to determine low abundant biological active proteins in complex human samples has increased in recent years: immuno-capture analysis combines the workflow of conventional immunological assays with LC–MS analysis. This paper describes typical challenges, such as cross reactivity and the mass spectrometer’s dynamic range, as well as the advantages of isoform differentiation and multiplexing. Additionally, some experimental formats of immuno-capture bottom-up LC–MS analysis of biological active proteins in complex human samples will be discussed.