The charge heterogeneity of a monoclonal antibody (mAb) is as a sum factor of several post translational modifications and most of them are of high importance regarding product quality and efficacy. For this reason monitoring and controlling of this sum factor can be beneficial. The work presented here builds the basis for on-line monitoring and will help to achieve Quality by Control (Sommeregger et al., 2017). The aim of this work was to develop a method that allows fast and accurate determination of the charge profile of monoclonal antibodies directly from cell culture supernatants. We were able to circumvent a pre-purification step by adapting a cation exchange method (CEX) using a highly linear pH gradient (Lingg et al, 2013). The established method was then used to gain information about the formation of charge variants during a fed-batch process of an industrial relevant mAb produced by a Chinese Hamster Ovary (CHO) cell line.
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