ASIF BIOTECH

Removing bovine endogenous retrovirus (BERV) or Bovine exogenous retrovirus (BERV) from plasma protein is important to avoid contamination of biological products. One common method for removing BET from plasma protein is through DEAE (Diethylaminoethyl) resin anion-exchange chromatography. A study by Tsai et al. (2013) titled "Removal of Bovine Exogenous Retrovirus from Human Plasma-Derived Products Using DEAE Anion-Exchange Chromatography" published in the Journal of Virological Methods, describes the use of DEAE resin anion-exchange chromatography to effectively remove BET from human plasma-derived products such as albumin, immunoglobulin, and coagulation factor IX. The study found that DEAE resin anion-exchange chromatography was able to effectively remove BET proteins while maintaining the activity and purity of the plasma proteins. Another study by Wang et al. (2015) titled "Removal of bovine endogenous retrovirus from human plasma-derived protein using DEAE ani

Removing bovine endogenous retrovirus (BERV) or Bovine exogenous retrovirus (BERV) from plasma protein through DEAE (Diethylaminoethyl) resin anion-exchange chromatography is a common method. DEAE resin is a type of anion-exchange resin that can be used for the purification of plasma proteins. Here are the general steps for removing BET from plasma protein through DEAE resin anion-exchange chromatography: 1.     Prepare the sample: The plasma protein sample should be clarified and filtered to remove any debris or contaminants before being loaded onto the column. 2.     Equilibrate the column: The column should be equilibrated with a buffer that is compatible with the DEAE resin. A common buffer used is a low salt buffer such as Tris-HCl, pH8.0 3.     Load the sample: The plasma protein sample is then loaded onto the column, and the BET proteins are retained by the DEAE resin while the other proteins pass through. 4.     Wash the column: The column is washed with a buffer to remove any

The pH of the culture medium is an important parameter that affects the growth and productivity of cells in a bioreactor. The pH can affect the solubility, stability and activity of enzymes, as well as the uptake and metabolism of nutrients. In the case of rituximab production, the pH can affect the stability and activity of the protein, as well as the productivity of the cells. Optimal pH for rituximab production in Chinese hamster ovary (CHO) cells usually ranges from 7.0 to 7.5. A pH that is too low or too high can cause the protein to denature or aggregate, reducing its activity and stability. Additionally, a pH that is too low or too high can also cause stress to the cells, reducing their productivity. A research article "Development of a high-titer, high-density fed-batch process for the production of Rituximab in Chinese Hamster Ovary (CHO) cells" by Wang et al. (2015) aimed to improve the production of rituximab by developing a high-titer and high-density fed-batc

A research article "Comparison of different serum-free media for the growth and productivity of Chinese hamster ovary cells" by Chen et al. (2018) aimed to compare the performance of different serum-free media for the growth and productivity of Chinese hamster ovary (CHO) cells, a commonly used host for recombinant protein production. The study compared several commercially available serum-free media, including Gibco's CD CHO-S, Thermo Fisher's CD CHO-SFM, and Biochrom's CD Opti-CHO, as well as a custom medium developed by the authors. The study evaluated the cell growth, viability, and productivity of the cells in each of the media. The results of the study showed that all of the serum-free media were able to support the growth and viability of the CHO cells, but there were significant differences in the productivity of the cells. The custom medium developed by the authors showed the highest productivity of the cells, followed by the Biochrom's CD Opti-CH

Tocilizumab (Actemra) is a humanized monoclonal antibody that targets the interleukin-6 (IL-6) receptor, which is involved in the inflammatory response. It is used to treat rheumatoid arthritis, systemic juvenile idiopathic arthritis and other inflammatory conditions. It is produced using recombinant DNA technology in Chinese hamster ovary (CHO) cells. One research article "Development of an efficient and scalable fed-batch culture process for the production of tocilizumab in Chinese hamster ovary cells" by Li et al. (2019) aimed to optimize the production of tocilizumab using a fed-batch cultivation system in CHO cells. The study aimed to improve the yield and quality of the protein, and to develop a process that can be easily scaled up for industrial production. The results of the study showed that the yield of tocilizumab was significantly improved by optimizing the culture conditions, such as the temperature, pH, and dissolved oxygen, as well as by using a specific

Adalimumab is a recombinant human monoclonal antibody that is used to treat a variety of inflammatory diseases, such as rheumatoid arthritis, psoriasis, and Crohn's disease. It is produced using recombinant DNA technology in Chinese hamster ovary (CHO) cells. A research article "Development of a high-titer, high-density fed-batch process for the production of adalimumab in CHO cells" by Chen et al. (2018) aimed to improve the production of adalimumab by developing a high-titer and high-density fed-batch process. The study used a CHO cell line that had been modified to express the adalimumab gene. The cells were grown in a culture medium containing glucose, amino acids, and a proprietary feed supplement, and the culture conditions were optimized to achieve high yields of the protein. The results of the study showed that a high yield of adalimumab (over 2g/L) was achieved using the fed-batch cultivation system. The study also found that the specific productivity of th