New test method for evaluation of water cartridge filters

Jourdan, Marie-Françoise; Peuchot, C.; Hunt, Trevor

doi:10.1016/0015-1882(94)80161-4

Cited by 4 publications

(1 citation statement)

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“…Two important measures of their performance are filtration efficiency and retention capacity (Jourdan and Peuchot, 1994). As the filter collects solids, an increasing pressure is required to maintain flow and this becomes excessive at some point, signaling the need for a change of filter.…”

Section: Introductionmentioning

confidence: 99%

Impact of clarification strategy on chromatographic separations: Pre‐processing of cell homogenates

Bracewell

Boychyn

Baldascini

et al. 2008

Biotech & Bioengineering

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This research focused on how the extent and type of primary solid-liquid separation can affect the performance of guard filtration and chromatography, in this instance hydrophobic interaction chromatography. The system used in the study was yeast (Saccharomyces cerevisiae) with the target molecule being an intracellular protein; alcohol dehydrogenase (ADH). As expected, loading more poorly clarified suspensions (both centrates and primary filtrates) required proportionally larger guard filtration areas. In addition for feed suspensions prepared by centrifugation, increased clarification led to greater column capacity. However, where filtration was used to achieve similar clarification considerably lower column capacity was achieved. These results were attributed to centrifugation leading to the aggregation of lipids and their subsequent removal in this form before application to the column. Clarification by filtration leaves such lipids in their original "soluble" state and hence they are not removed. The importance of the need to examine such interactive effects in bioprocess studies is discussed. This observation was confirmed with further analytical work into the nature of the aggregated material formed in the supernatant under centrifugation conditions. This material was only soluble in an organic solvent, and identified as phophatidylcholine and ergosterol as among the components removed by centrifugation and guard filtration as opposed to filtration and guard filtration.

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Section: Introductionmentioning

confidence: 99%