Interaction between Coomassie brilliant blue G250 and octylphenol polyoxyethylene ether (10) in aqueous solution

ABSTRACT

The characteristic absorption peak of Coomassie brilliant blue G250 (CBBG250) has obvious redshift phenomenon by the addition of octylphenol polyoxyethylene ether (10) (OP-10) in aqueous solution, which shows that there is interaction between CBBG250 and OP-10. Two physical models are described and applied to the study of the interactions of CBBG250 with OP-10. According to the microphase adsorption-spectral correction (MPASC) technique, CBBG250 can be adsorbed on a surfactant by electrostatic force, and the aggregation obeys the Langmuir isotherm. The adsorption constant and the maximum binding ratio of the aggregates are calculated to be B = 4.32 × 10⁵ L/mol and N = 0.137, respectively. The surfactant-dye association interaction (SDAI) model believes that there is significant association interaction between the CBBG250 and nonionic surfactant OP-10 in aqueous solutions, and a series of thermodynamic parameters such as K, , and are also determined. The simulation results indicate that the two models can fit the experimental data very well.

GRAPHICAL ABSTRACT

KEYWORDS:

• Coomassie brilliant blue G250
• microphase adsorption-spectral correction technique
• octylphenol polyoxyethylene ether (10)
• surfactant-dye association interaction model
• thermodynamic parameters

Additional information

Funding

This work was Supported by the Program Project of Science and Technology Department of Gansu Province (Grant No.1407GCCA013), the Lanzhou Municipal Science and Technology Bureau Program (Grant No.2015-4-137), the excellent platform of research and “Qing Lan” Talent Engineering Funds of Lanzhou Jiaotong University.