Virus filtration in biopharmaceutical downstream process ensures viral safety with removal efficiency greater than 99.99%. Despite its robust performance, it has been reported that viruses can escape ...through the membrane under certain conditions. This study aimed to investigate virus breakthrough using Viresolve® Pro membrane with PP7 bacteriophage under high bacteriophage titer, high protein concentration, flow interruption, and low-flux operation. The results show high virus removal performance (LRV >6.8) up to 109 PFU/mL for 200 L/m2, with the first phage breakthrough observation over 1012 PFU/m2 of phage challenge in the membrane. As the protein concentration increased in the coexistence condition, a greater number of phages passed through the membrane. During the post-buffer flush and the operation at low filtrate flux, diffusion plays an important role in the escape of phages, which were detected as high as 1012 PFU/m2, but as low as 109 PFU/m2. These results suggest that the virus-retentive membrane may become susceptible to undesired virus breakthrough when exposed to phage challenges of > 1012 PFU/mL, providing important key factors to ensure viral safety during the downstream process of biopharmaceutical production.
•Virus breakthrough during filtration was investigated under harsh conditions.•Viresolve® Pro membrane showed robust virus removal performance as LRV > 6.8.•The first phage breakthrough occurred at ∼1012 PFU/m2 of phage challenge.•As the protein concentration increased, more phages escaped.•Diffusion plays an important role in virus breakthrough.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Virus filtration process is used to ensure viral safety in the biopharmaceutical downstream processes with high virus removal capacity (i.e., >4 log10). However, it is still constrained by protein ...fouling, which results in reduced filtration capacity and possible virus breakthrough. This study investigated the effects of protein fouling on filtrate flux and virus breakthrough using commercial membranes that had different symmetricity, nominal pore size, and pore size gradients. Flux decay tendency due to protein fouling was influenced by hydrodynamic drag force and protein concentration. As the results of prediction with the classical fouling model, standard blocking was suitable for most virus filters. Undesired virus breakthrough was observed in the membranes having relatively a large pore diameter of the retentive region. The study found that elevated levels of protein solution reduced virus removal performance. However, the impact of prefouled membranes was minimal. These findings shed light on the factors that influence protein fouling during the virus filtration process of biopharmaceutical production.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
Maximizing product yield in biopharmaceutical manufacturing processes is a critical factor in determining the overall cost of goods, especially given the high value of these biological products. ...However, there has been relatively limited research on the quantitative analysis of protein losses due to adsorption and fouling during the different membrane filtration processes employed in typical downstream operations. This study aims to provide a comprehensive analysis of protein loss in the range of membrane systems used in downstream processing including clarification, virus removal filtration, ultrafiltration/diafiltration for formulation, and final sterile filtration, all using commercially available membranes with three model proteins (bovine serum albumin, human serum albumin, and immunoglobulin G). The correlation between protein loss and various parameters (i.e., protein type, protein concentration, throughput, membrane morphology, and protein removal mechanism) was also investigated. This study provides important insights into the nature of protein loss during membrane processes as well as a methodology for quantifying protein yield loss in bioprocesses.
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This study aims to provide a comprehensive analysis of protein loss in clarification, virus removal filtration, ultrafiltration/diafiltration for formulation, and final sterile filtration using commercially available membranes with three model proteins (bovine serum albumin, human serum albumin, and immunoglobulin G). The correlation between protein loss and various parameters (i.e., protein type, protein concentration, throughput, membrane morphology, and protein removal mechanism) was also investigated. This study provides important insights into the nature of protein loss during membrane processes as well as a methodology for quantifying protein yield loss in bioprocesses.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
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