LAUSR

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