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Figure 2 | Microbial Cell Factories

Figure 2

From: Production and purification of high molecular weight oligomers of Yersinia pestis F1 capsular antigen released by high cell density culture of recombinant Escherichia coli cells carrying the caf1 operon

Figure 2

Purification process of rF1 antigen. (1) Fermentation culture supernatant. (2) 0.2 μm micro-filtration filtrate. (3) 50 kDa ultra-filtration retentate. (4) 33% ammonium sulfate precipitate. (5) Flow-through of Superdex-200 size-exclusion chromatography. (6) Y. pestis F1 standard.

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