Interactions between a surface active imidazolium ionic liquid and BSA

Fei Geng; Liqiang Zheng; Li Yu; Jie Liu; Zhen Li

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Interactions between a surface active imidazolium ionic liquid and BSA

Fei Geng 1,Liqiang Zheng 1,Li Yu 1 * #,Jie Liu 2,Zhen Li 1

1.Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education

2.Department of Chemistry, Liaocheng University

*Correspondence author

#Submitted by

Subject:

Funding: 国家自然科学基金,山东省自然科学基金（重点）,教育部博士点基金（新教师基金）（No.20773081,Z2007B06,070422047）

Opened online:19 February 2009

Accepted by: none

Citation: Fei Geng,Liqiang Zheng,Li Yu.Interactions between a surface active imidazolium ionic liquid and BSA[OL]. [19 February 2009] http://en.paper.edu.cn/en_releasepaper/content/29320

The interactions between a surface active imidazolium ionic liquid (IL), 1-tetradecyl-3-methylimidazolium bromide (C14mimBr) and bovine serum albumin (BSA) were investigated by surface tension, isothermal titration microcalorimetry, far-UV circular dichroism (CD) and fluorescence spectra. The surface tension measurement shows the formation of C14mimBr/BSA complex and the effect of the complex on surface tension. The enthalpy change in the whole interaction process between C14mimBr and BSA was obtained by isothermal titration microcalorimetry, and the results show alteration of the BSA structure. The contents of α-helix and random coil were obtained by far-UV CD. Changes of these contents reveal that the secondary structure of BSA changes with addition of C14mimBr. Fluorescence spectra show that tryptophan (Trp) residues, one of the intrinsic fluorophores in BSA, are exposed to a hydrophobic microenvironment with the addition of C14mimBr.

Keywords:surface active imidazolium ionic liquid;bovine serum albumin;interaction;secondary structure

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