Immunoprecipitation on magnetic beads and liquid chromatography-tandem mass spectrometry for carbonic anhydrase II quantification in human serum

Analytical Biochemistry
Luciano CallipoAldo Laganà

Abstract

In this study, a magnetic bead-based platform amenable to high-throughput protein carbonic anhydrase II (CA II) capture is presented. The key steps in this approach involved immunoaffinity purification of the target protein from serum followed by on-bead digestion with trypsin to release a surrogate peptide. This tryptic peptide was quantified by liquid chromatography-electrospray ionization-tandem mass spectrometry (LC-ESI-MS/MS) operating in multiple reaction monitoring acquisition mode. Using a synthetic peptide standard and a structural analogue free-labeled internal standard, the resulting concentration was stoichiometrically converted to CA II serum concentration. The analytical steps, such as preparation of immunobeads, protein capture, proteolysis, and calibration, were optimized. The method was validated in terms of recovery (77%), reproducibility (relative standard deviation [RSD]<12%), and method detection limit (0.5 pmol ml(-1)). The developed method was applied to determining the CA II in eight healthy subjects, and the concentration measured was 27.3 pmol ml(-1) (RSD = 65%).

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Citations

Jan 18, 2013·Analytical and Bioanalytical Chemistry·Quentin EnjalbertJérôme Lemoine
May 21, 2013·Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences·Irene van den BroekWilliam D van Dongen
Oct 4, 2016·Analytical and Bioanalytical Chemistry·Nicole A SchneckMark S Lowenthal
Oct 21, 2016·Analytical and Bioanalytical Chemistry·Qian QiXiangmin Zhang
Jan 29, 2020·Oncogene·Olivia McGinnCarol A Sartorius

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