Production and application of high quality stable isotope-labeled human immunoglobulin G1 for mass spectrometry analysis.

Here, we describe the production of stable isotope-labeled human immunoglobulin G1 ([ C]-hIgG1) using [ C]-L-lysine/arginine-labeled hIgG1. The fermentation process was run in shake flasks containing labeled arginine and lysinethat were incorporated into the produced recombinant hIgG1. The [ C]-hIgG1 was purified, and label incorporation was determined to be >99% at all lysine and arginine moieties.