Trend analysis of performance parameters of pre packed columns for protein chromatography over a time span of ten years.
Pre packed small scale chromatography columns are increasingly used for process development, for determination of design space in bioprocess development, and for post licence process verifications. The packing quality of 30,000 pre packed columns delivered to customers over a period 10 years has been analyzed by advanced statistical tools. First, the data were extracted and checked for inconsistencies, and then were tabulated and made ready for statistical processing using the programming language Perl (https:/www.perl.org/ and the statistical computing environment R (https:/www.r project.org/ Reduced HETP and asymmetry were plotted over time to obtain a trend of packing quality over 10 years. The obtained data were used as a visualized coefficient of variation analysis (VCVA) a process that has often been applied in other industries such as semiconductor manufacturing. A typical fluctuation of reduced HETP was seen. A Tsunami effect in manufacturing, the effect of propagation of manufacturing deviations leading to out of specification products, was not observed with these pre packed columns. Principal component analysis (PCA) showed that all packing materials cluster. Our data analysis showed that the current commercially available chromatography media used for biopharmaceutical manufacturing can be reproducibly and uniformly packed in polymer based chromatography columns, which are designed for ready to use purposes. Although the number of packed columns has quadrupled over one decade the packing quality has remained stable.
Journal of chromatography. A