Application of response surface methodology to the modeling of α-amylase purification by aqueous two-phase systems
Date
2005
Authors
Zhi, W.
Song, J.
Ouyang, F.
Bi, J.
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Advisors
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Volume Title
Type:
Journal article
Citation
Journal of Biotechnology, 2005; 118(2):157-165
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Abstract
Mathematical models concerning the purification of greek small letter alpha-amylase from the cultivation supernatant of Bacillus subtilis in a polyethylene glycol–citrate aqueous two-phase system (ATP) are established with response surface methodology. The PEG3350, citrate and sodium chloride concentrations were selected as variables to evaluate the purification impact factors in aqueous two-phase system, including partition coefficients of greek small letter alpha-amylase, total protein, purification factor and greek small letter alpha-amylase yield. An experimental space with two-fold purification and over 90% yield of greek small letter alpha-amylase is achieved through the optimized condition basing on the model. Two systems with low viscosity within said space were further selected to perform greek small letter alpha-amylase purification and the experimental results coincide well with the calculation of the models, which indicates that the model provides a promising tool for experimental design of protein purification by aqueous two-phase system.