Virus removal using membrane filtration based on size exclusion is dictated by the pore size distribution of the membrane. However, information characterizing the pore size distribution of virus filters, and comparisons of quantitative predictions of virus retention performance from pore size distribution data to measured virus retention performance is limited. In this work, liquid-liquid porometry (LLP) was used to characterize the pore size distributions of developmental and commercial virus filtration membranes spanning a range of pore size distributions. Measurements were conducted with an automated high resolution LLP test system customized for virus filter membranes. Using these pore size distributions determined from LLP, a mechanistic mathematical model grounded on the principle of particle retention by size exclusion closely predicted measured virus retention performance, both as a function of virus size and of membrane pore size. The data and model predictions from this study support the understanding that size exclusion is the primary mechanism for virus retention in membrane filters. An abridged LLP test, which is focused on a critical portion of the pore size distribution, was developed and is utilized at-line during membrane casting to assure consistent membrane pore size and therefore consistent virus retention.

Measurement of pore size distribution and prediction of membrane virus retention using liquid-liquid porometry

247th National Meeting (2014)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.