Single-step purification of ovalbumin from egg white using aqueous biphasic systems
authors Pereira, MM; Cruz, RAP; Almeida, MR; Lima, AS; Coutinho, JAP; Freire, MG
nationality International
journal PROCESS BIOCHEMISTRY
author keywords Ovalbumin; Protein recovery; Separation; Aqueous two phase; Downstream processing; Egg white
keywords 2-PHASE SYSTEMS; POLYETHYLENE-GLYCOL; EXCHANGE CHROMATOGRAPHY; PROTEIN AGGREGATION; LYSOZYME; SEPARATION; ULTRAFILTRATION; PEG; TEMPERATURE; SUPPRESSION
abstract The ability of aqueous biphasic systems (ABS) composed of polyethylene glycols of different molecular weights (PEG 400, 600 and 1000) and buffered aqueous solutions of potassium citrate/citric acid (pH 5.0-8.0) to selectively extract ovalbumin from egg white was here investigated. Phase diagrams, tie lines and tie-line lengths were determined at 25 degrees C and the partitioning of ovalbumin in these systems was then evaluated. Aiming at optimizing the selective extraction of ovalbumin in the studied ABS, factors such as pH, PEG molecular weight and amount of the phase-forming components were initially investigated with pure commercial ovalbumin. In all ABS, it was observed a preferential partitioning of ovalbumin to the polymer-rich phase, with extraction efficiencies higher than 90%. The best ABS were then applied in the purification of ovalbumin from the real egg white matrix. In order to ascertain on the ovalbumin purity and yield, sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) and size exclusion high performance liquid chromatography (SE-HPLC) analyses were conducted, confirming that the isolation/purification of ovalbumin from egg white was completely achieved in a single-step with a recovery yield of 65%. The results obtained show that polymer-salt-based ABS allow the selective extraction of ovalbumin from egg white with a simpler approach and better performance than previously reported. Finally, it is shown that ovalbumin can be completely recovered from the PEG-rich phase by an induced precipitation using an inexpensive and sustainable separation platform which can be easily applied on an industrial scale. (C) 2016 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 1359-5113
year published 2016
volume 51
issue 6
beginning page 781
ending page 791
digital object identifier (doi) 10.1016/j.procbio.2016.03.002
web of science category Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Engineering, Chemical
subject category Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Engineering
unique article identifier WOS:000377325800013
  ciceco authors
  impact metrics
journal analysis (jcr 2017):
journal impact factor 2.616
5 year journal impact factor 2.987
category normalized journal impact factor percentile 56.882
dimensions (citation analysis):
altmetrics (social interaction):



 


Sponsors

1suponsers_list_ciceco.jpg