How do I scale-up my reversed-phase flash chromatography method?

Scaling up reversed-phase flash chromatography methods is often necessary as reaction scale increases. This is especially true when other non-chromatographic purification techniques do not work or meet purity and/or yield needs.

While preparative reversed-phase chromatography is an option, this technique suffers from low loading capacity and slow throughput. This post details how to simply scale-up reversed-phase flash purification methods using automated flash chromatography systems and prepacked columns.

For success scaling reversed-phase flash chromatography methods, several operating parameters must be held constant…

• -Sample concentration
• -Sample load as a percentage of stationary phase mass
• -Column media and brand
• -Elution solvents
• -Elution gradient in terms of column volumes
• -Solvent flow velocity (linear velocity, not flow rate)
• -Detection wavelengths
•  

These parameters are determined during small-scale method development, typically using columns 6 to 60 grams in size. Once a method is optimized on the small column, scale-up is linear based on the ratio of column media masses. For example, if 140 mg of a mixture is successfully purified on a 12-gram C18 column then a 60-gram column will successfully purify 5x that amount, or 700 mg, Figure 1.

Figure 1. Linear scale-up purification of a 7-component mixture. Top - 12 g Biotage Sfar C18 column with a 140 mg load. Bottom - 60 g Biotage Sfar C18 column with a 700 mg load (5x more than the 12 g column).

For this example, the seven previously mentioned operating parameters were held constant, Table 1.

Table 1. Chromatographic operating parameters

By maintaining these seven parameters, purification scale-up is possible even to kilogram scale.

For more information on scale-up please download our whitepaper Optimizing Chromatographic Purification for Rapid Results in Chemical Manufacturing.

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