Extraction and stability of bovine serum albumin (BSA) using cholinium-based Good's buffers ionic liquids
authors Taha, M; Quental, MV; Correia, I; Freire, MG; Coutinho, JAP
nationality International
journal PROCESS BIOCHEMISTRY
author keywords Good's buffer ionic liquids; Aqueous two-phase extraction; Protein stability; Bovine serum albumin (BSA); Protein extraction
keywords AQUEOUS 2-PHASE SYSTEMS; PROTEIN SECONDARY STRUCTURE; BIPHASIC SYSTEMS; BIOLOGICAL-RESEARCH; ALPHA-CHYMOTRYPSIN; SEPARATION; MEDIA; CHROMATOGRAPHY; PARTITION; EFFICIENT
abstract Good's buffers ionic liquids (GB-ILs), composed of cholinium-based cations and Good's buffers anions, display self-buffering characteristics in the biological pH range, and their polarity and hydrophobicity can be easily tuned by a proper manipulation of their ions chemical structures. In this work, the extraction ability for bovine serum albumin (BSA) of aqueous biphasic systems (ABS) formed by polypropylene glycol 400 (PPG 400) and several GB-ILs was evaluated. ABS formed by PPG 400 and cholinium chloride ([Ch]Cl), GBs, and sucrose were also investigated for comparison purposes. It is shown that BSA preferentially migrates for the GB-IL-rich phase, with extraction efficiencies of 100%, achieved in a single-step. Dynamic light scattering, and circular dichroism (CD) and Fourier transform infrared (FTIR) spectroscopies were employed to evaluate the effect of the investigated cholinium-based GB-ILs on the BSA stability, and compared with results obtained for the respective GBs precursors, [Ch]Cl and sucrose, a well-known protein stabilizer. Molecular docking studies were also carried out to investigate on the binding sites of GB-IL ions to BSA. The experimental results confirm that BSA has a higher stability in GB-ILs than in any of the other compounds investigated. (C) 2015 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 1359-5113
year published 2015
volume 50
issue 7
beginning page 1158
ending page 1166
digital object identifier (doi) 10.1016/j.procbio.2015.03.020
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:000356749300017
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