Jump to main content
Jump to site search

Issue 33, 2014
Previous Article Next Article

Insights into the denaturation of bovine serum albumin with a thermo-responsive ionic liquid

Author affiliations

Abstract

Influence of bovine serum albumin on the phase transition behavior of the synthetic ionic liquid tetrabutylphosphonium styrenesulfonate ([P4,4,4,4][SS]) together with the interactions between [P4,4,4,4][SS] and bovine serum albumin (BSA) was investigated by differential scanning calorimetry (DSC), turbidity measurements, FT-IR, in combination with perturbation correlation moving window (PCMW) and two-dimensional correlation spectroscopy (2DCOS). Our results reveal that the addition of BSA would increase the phase transition temperature but weaken the transition behavior of [P4,4,4,4][SS] solution. DSC and turbidity data show us that the transition temperature of a ternary system with 20 wt% BSA added is 3 °C higher than that with 20% (w/v) [P4,4,4,4][SS] solution. Interactions between [P4,4,4,4][SS] and BSA together with the phase transition behavior of [P4,4,4,4][SS] are responsible for the denaturation of BSA upon heating. PCMW determined the obvious distinctions in LCST of different chemical groups manifesting their various response sequences in the phase separation and denaturation upon heating. Finally, 2DCOS was employed to elucidate the sequential order of chemical group motions during heating. It is worth noting that the appearance of the isosbestic point in the C[double bond, length as m-dash]O groups of FTIR spectra indicates the direct transformation of the conformation of α-helix, random coil to β-sheet and β-turn without an intermediate transition state. Additionally, the phase separation process of ionic liquid is able to recover to the original state before heating while the denaturation of BSA is irreversible after a cooling process.

Graphical abstract: Insights into the denaturation of bovine serum albumin with a thermo-responsive ionic liquid

Back to tab navigation

Supplementary files

Article information


Submitted
30 apr. 2014
Accepted
13 jún. 2014
First published
13 jún. 2014

Soft Matter, 2014,10, 6161-6171
Article type
Paper
Author version available

Insights into the denaturation of bovine serum albumin with a thermo-responsive ionic liquid

W. Li and P. Wu, Soft Matter, 2014, 10, 6161
DOI: 10.1039/C4SM00941J

Social activity

Search articles by author

Spotlight

Advertisements