Controlling trace elements in raw materials and cell culture media for better performance in bioproduction

Importance of the Topic

The control of trace elements in raw materials and cell culture media is critical for consistent and high-quality bioproduction of therapeutic proteins. Variations in metal ion levels can significantly impact cell growth, viability, protein yield and modifications. Accurate monitoring of elemental impurities ensures reproducible cell culture performance and reduces risks associated with batch-to-batch variability.

Objectives and Study Overview

This case study describes a validated approach using ICP-MS to quantify trace metals in both raw inputs and finished cell culture media. Multiple global sites within Thermo Fisher Scientific’s Cell Culture and Cell Therapy division implemented this method to ensure consistent media formulation for CHO cell–based bioproduction. The service covers over 3,000 raw materials and includes finished-good testing to support custom media formulations.

Methodology

Samples of inorganic salts, amino acids, sugars, vitamins and other media components were analyzed by Inductively Coupled Plasma Mass Spectrometry. Matrix and polyatomic interferences arising from high salt concentrations and organic components were addressed through the use of collision/reaction cell technology and triple quadrupole operation modes. Lot-to-lot variability was assessed by comparing elemental impurity profiles across multiple batches.

Used Instrumentation

• Thermo Scientific iCAP TQ ICP-MS (triple quadrupole system)
• Single quadrupole ICP-MS systems

Main Results and Discussion

The application of ICP-MS enabled reliable quantification of key trace elements such as copper, iron, zinc, manganese, molybdenum, selenium, vanadium and cobalt at µM levels. Consistency across global sites was demonstrated by method transfer with minimal adjustments. Data collected in a centralized database allowed historical trend analysis and identification of raw material lots that may compromise media performance. The study highlighted the critical influence of trace metals on cell viability, glycosylation patterns and monoclonal antibody productivity.

Benefits and Practical Applications

• Ensures lot-to-lot consistency of cell culture media and raw materials
• Reduces risk of poor cell growth, suboptimal protein yield and quality issues
• Enables rapid screening of raw materials and finished media to meet customer specifications
• Supports custom media formulation by predicting trace metal composition

Future Trends and Applications

Growing demand for biologics and personalized therapies will drive further refinement of trace element analysis in cell culture. Advances may include integration of real-time monitoring, automation of sample preparation and expansion to additional elemental and molecular profiling. Standardization efforts for media impurity guidelines are expected to improve regulatory compliance and cross-industry harmonization.

Conclusion

The deployment of triple quadrupole ICP-MS across multiple sites provides robust control of elemental impurities in cell culture media and raw materials. This approach ensures reliable bioproduction performance, enhances product quality and mitigates risks associated with material variability. Centralized data management and method consistency support scalable, high-throughput analysis for both standard and custom formulations.

References

• Ritacco F.V., Wu Y., Khetan A. Cell Culture Media for Recombinant Protein Expression in Chinese Hamster Ovary (CHO) Cells: History, Key Components, and Optimization Strategies. Biotechnol. Prog. 2018;34(6):1407–1426.
• AN43403: The determination of elemental impurities in vitamin B12 supplements using triple quadrupole ICP-MS. Thermo Fisher Scientific.
• Thermo Fisher Scientific. Trace element finished-good testing for cell culture media. 2021.