Abstract
The composition of the cell culture microenvironment, particularly nutrient availability, plays a critical role in determining the yield and structural integrity of recombinant proteins. Industrial-scale bioprocesses, which typically span 7–15 days, rely on nutrient-rich, balanced media and feeds to support cellular metabolism and biosynthesis. However, the proprietary and variable nature of commercial media formulations can introduce inconsistencies in product quality across batches. To address this, the present study employed robust chromatographic methods to profile amino acids and water-soluble vitamins in culture media and investigated their influence on post-translational modifications in recombinant proteins. Two model proteins a GLP-1 analog (∼73 kDa) and a monoclonal antibody (∼145 kDa) were evaluated to assess the impact of specific media components on protein quality. Compositional analysis revealed that cysteine-rich feeds were associated with structural heterogeneity due to cysteinylation and disulfide bond imbalances. Modulating cysteine concentrations successfully mitigated these undesired modifications, resulting in structurally homogeneous protein products. These findings demonstrate that targeted adjustment of media composition, informed by analytical profiling, offers an effective strategy for optimizing recombinant protein expression. The study underscores the importance of upstream nutrient control in improving consistency, reducing process complexity, and accelerating the development of high-quality biotherapeutics.
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