Abstract: The interaction between malachite green (MG) and cetyltrimethyl ammonium bromide (CTAB) micelle simulating life system has been studied in the CTAB micelle using UV-Vis and fluorescent spectra.The results show that MG can locate in the palisade of CTAB micelle spontaneously,which leads to the increase of the aggregation number (N) and the decrease of the micro-polarity (I1/I3) of CTAB micelle.Both of the binding constant K of MG with CTAB micelle and the distribution coefficient KD of MG between the CTAB micelles and the aqueous phase decrease with the increase of the concentration of MG.These results indicate that the interaction between MG molecules and CTAB micelles decreases with the increase of MG concentration.

Key words: Malachite green, Micelles, CTAB, Life simulation, Binding constant, 　Distribution coefficient