Centrifugal recovery and dissolution of recombinant Gly-IGF-II inclusion-bodies: the impact of feedrate and re-centrifugation on protein yield.

The impact of centrifuge feedrate and multiple centrifuge passes on protein yield following recombinant Gly-Insulin-like Growth Factor II (Gly-IGF-II) inclusion-body dissolution has been investigated. Altering centrifuge feedrate did not significantly improve the overall protein yield following dissolution. Improved centrifuge recovery at a low feedrate was offset by poorer inclusion body paste purity. This reduced purity resulted in a significant loss of protein during inclusion-body dissolution due to proteolysis. Multiple centrifuge passes improved the inclusion-body paste purity. This resulted in a net improvement in the overall protein yield following dissolution. This work demonstrates that a strong interaction exists between centrifuge performance and inclusion-body dissolution for protease-sensitive products such as Gly-IGF-II.