(582aa) Predication of Sialic Acid Reduction in CHO Culture
AIChE Annual Meeting
2013
2013 AIChE Annual Meeting
Food, Pharmaceutical & Bioengineering Division
Poster Session: Bioengineering
Wednesday, November 6, 2013 - 6:00pm to 8:00pm
Sialic acid content is an important quality attribute in the development of many therapeutic glycoproteins. Increased sialic acid content is often linked to an increased half-life in the human body. In a GS-CHO cell line producing a recombinant enzyme, we observed that the total sialic acid content (TSAC) of the glycoprotein decreased over time. As the enzyme is being produced in a second generation process using a new cell line, it is important to determine the primary cause of this decline to help match product quality of the original process. A series of studies were performed to measure TSAC in standard culture conditions as well as in a cell-free harvest hold. In addition, sialidase activity was measured in daily samples, and compared to lactate dehydrogenase (LDH) levels. In a preliminary study, some samples were held at production temperature for 5 days. A sample removed on the fourth day of the culture did not change whereas a sample from the eighth day lost 34% of its TSAC. With this information, a mathematical model was established to estimate TSAC. The model could potentially be used to predict TSAC based on culture parameters including pH, temperature, and viability.