In a typical purification starting from 1 kg of tissue, the volume of the initial homogenate might be 2 L and the final product of the procedure might be 2 mL of pure protein solution; that is, a volume decrease of 1000-fold is required. This emphasizes the fact that water is a major contaminant during protein purification, and at several steps during the procedure, the need will arise for concentration of the active extract or fraction. Concentration may occur as a concomitant of a step in purification; in the latter case, protein from a dilute solution may be absorbed onto the resin and subsequently eluted in a smaller volume by application of a salt gradient. In general, however, one or more steps specifically aimed at concentration of the protein solution will need to be done.
CITATION STYLE
Cutler, P. (2003). Protein Purification Protocols. Protein Purification Protocols. Humana Press. https://doi.org/10.1385/159259655x
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