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Improving viral filtration capacity in biomanufacturing processes using aggregate binding properties of polyamide‐6,6
Biotechnology and Bioengineering ( IF 3.8 ) Pub Date : 2020-11-26 , DOI: 10.1002/bit.27634
Vitali Stanevich 1 , Abhishek Pachalla 1 , Briana Nunez 1 , Mark McInnes 2 , Christopher Nieder 2 , John Schreffler 1
Affiliation  

Virus retention filtration is a common step in modern biopharmaceutical manufacturing as it enables efficient removal of potential adventitious and endogenous viruses via size exclusion. Modern parvovirus retention filters have significantly improved fluxes and parvovirus retention in comparison to earlier versions of these filters. However, these filters may be more susceptible to premature fouling and require more effort for process optimization. Here, we demonstrate that polyamide‐6,6 (nylon‐6,6) membranes when used as prefilters can increase the capacity of these Parvovirus retentive filters that are less susceptible to premature fouling. We found that the mechanism of polyamide‐mediated filtration improvement can be explained by the binding of monoclonal antibody (mAb) aggregates with a diameter of 20–100 nm, and we show that this mechanism is shared by other types of adsorptive prefilters. Finally, by the combination of mobile phase screening, additive spiking, and molecular dynamics simulations, we show that polyamide‐6,6 removes mAb aggregates through hydrophobic interactions making its design space potentially complementary to other available prefilters. Our studies support the aggregate‐mediated mechanism of flux decay during viral filtration and suggest that polyamide‐6,6 could be considered as an alternative cost‐effective option to extend the capacity of viral filters.

中文翻译:

使用聚酰胺-6,6 的聚合结合特性提高生物制造过程中的病毒过滤能力

病毒截留过滤是现代生物制药制造中的一个常见步骤,因为它能够通过尺寸排除有效去除潜在的外来病毒和内源病毒。与这些过滤器的早期版本相比,现代细小病毒截留过滤器显着提高了通量和细小病毒截留。然而,这些过滤器可能更容易受到过早结垢的影响,并且需要更多的努力来优化工艺。在这里,我们证明当用作预过滤器时,聚酰胺-6,6(尼龙-6,6)膜可以增加这些不易受过早污染的细小病毒截留过滤器的容量。我们发现聚酰胺介导的过滤改善机制可以通过与直径为 20-100 nm 的单克隆抗体 (mAb) 聚集体的结合来解释,我们证明了这种机制是由其他类型的吸附预过滤器共享的。最后,通过结合流动相筛选、添加剂加标和分子动力学模拟,我们表明聚酰胺-6,6 通过疏水相互作用去除 mAb 聚集体,使其设计空间可能与其他可用的预过滤器互补。我们的研究支持病毒过滤过程中通量衰减的聚集体介导机制,并表明聚酰胺-6,6 可被视为扩展病毒过滤器容量的另一种具有成本效益的选择。6 通过疏水相互作用去除 mAb 聚集体,使其设计空间可能与其他可用的预过滤器互补。我们的研究支持病毒过滤过程中通量衰减的聚集体介导机制,并表明聚酰胺-6,6 可被视为扩展病毒过滤器容量的另一种具有成本效益的选择。6 通过疏水相互作用去除 mAb 聚集体,使其设计空间可能与其他可用的预过滤器互补。我们的研究支持病毒过滤过程中通量衰减的聚集体介导机制,并表明聚酰胺-6,6 可被视为扩展病毒过滤器容量的另一种具有成本效益的选择。
更新日期:2020-11-26
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