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Semi Preparative Purification of Proteins


Most Basic Recommended Cecil Instrumentation:
Cecil Adept HPLC System 4BP, semi-preparative, biocompatible with a PEEK 500 l loop
Fraction collector
Column heater


Introduction:
Researchers need to understand the expression of proteins. They also would like to understand protein expression in healthy and diseased cells.

Hence the study of proteomics, which characterises and analyses of the function of proteins in the body is crucial.

In general, a mixture of proteins is separated by HPLC the resultant major peaks are collected in a fraction collector. This collected material is then suitable for characterisation by amino acid analysis, sequence analysis, capillary electrophoresis or SDS-PAGE gel electrophoresis.

The same analytical HPLC method may be used to elute a given protein mixture. If larger quantities of the separated proteins are required, the user can very easily scale up the analytical method to semi-preparative scale. The key parameter for transferring an HPLC separation from the analytical to preparative scale is column volume. Both mass load and volume load need to be scaled in proportion to column volume. Flow rates should be scaled up in proportion to column volumes.

The HPLC method may for example, involve the use of ion exchange , gel filtration or affinity chromatography techniques, depending on the proteins of interest A uv/visible HPLC detector is often used.

If there is a limited quantity of sample, reverse phase narrow bore HPLC column (0.21 x 25cm) is useful. Analytical HPLC reverse phase columns, 0.46 x 25cm, are useful for larger sample quantities up to 500g. Semi-preparative HPLC , to 3mg/run, may be run on wider bore columns such as 2.2 x 25cm.

In some cases, it may be necessary to remove interfering and abundant proteins, such as
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