Recovery and purification of a Kluyvermyces lactis β-galactosidase by Mixed Mode Chromatography

•Recovery of a fermentation-derived β-galactosidase and purification by mixed-mode resin Capto MMC.•Construction and validation of statistical models to describe the process and optimize adsorption and desorption conditions.•Confirmation of purification evolution by SDS-PAGE electrophoresis after ea...

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Veröffentlicht in:Journal of chromatography. B, Analytical technologies in the biomedical and life sciences Analytical technologies in the biomedical and life sciences, 2016-03, Vol.1015-1016, p.181-191
Hauptverfasser: Lima, Micael de Andrade, Freitas, Maria de Fátima Matos de, Gonçalves, Luciana Rocha Barros, Silva Junior, Ivanildo José da
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Sprache:eng
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Zusammenfassung:•Recovery of a fermentation-derived β-galactosidase and purification by mixed-mode resin Capto MMC.•Construction and validation of statistical models to describe the process and optimize adsorption and desorption conditions.•Confirmation of purification evolution by SDS-PAGE electrophoresis after each unit operation. Mixed Mode Chromatography (MMC) is a potential separation technique that allows simultaneous ionic and hydrophobic interactions between the adsorbent and the adsorbate. The aim of this work was to assess the recovery and purification of a Kluyveromyces lactis β-galactosidase employing MMC. Protein precipitation and dialysis were performed in order to concentrate the enzyme of interest and eliminate cell debris and other interferences inherent in the fermentation medium. The best conditions for both adsorption and desorption were attained by a non-factorial Central Composite Experimental Design and employed in the chromatographic runs with resin CAPTO MMC. Fermentation yielded mean values of total enzyme concentration of 0.44mg/mL, enzymatic activity (employing lactose as a substrate) of 74U/mL and specific activity of 168U/mg. The Purification Factor (PF) obtained was of 1.17. After precipitation and dialysis, the subsequent chromatographic run resulted in recovery values ​​of 41.0 and 48.2% of total protein concentration and enzymatic activity, respectively. SDS-PAGE electrophoresis confirmed the purification evolution throughout the unit operations employed, attesting the feasibility of the technique to obtain enzymes with not only considerable degree of purity but also possessing high-added value.
ISSN:1570-0232
1873-376X
DOI:10.1016/j.jchromb.2016.01.053