Acta Phys. -Chim. Sin. ›› 1998, Vol. 14 ›› Issue (02): 147-153.doi: 10.3866/PKU.WHXB19980210

• ARTICLE • Previous Articles     Next Articles

Effect of SDS Micelles and Premicelles on the Alkaline fading of Malachite Green

Zhang Yuan-Qin, Zeng Xian-Cheng, Yu Xiao-Qi, Tian An-Min   

  1. Department of Chemistry,Sichuan University,Chengdu 610064
  • Received:1997-05-15 Revised:1997-09-22 Published:1998-02-15
  • Contact: Zeng Xian-Cheng


Effect of SDS micelles and premicelles on the alkaline fading reversible reaction of malachite green has been studied. Micellar and premicellar catalytic models for the 1-1 type reversible reaction have been proposed.
The rate constants of forward and backward reactions and equilibrium constants of the alkaline fading reversible reaction of malachite greed in micellar phase have been obtained by the micellar model. Under premicellar condition the average number of SDS molecules per substrate molecule with n detergent molecules have been obtained by the premicellar catalytic model.
The results indicate that both SDS micelles and premicelles exhibit an inhibiting effect for the forward reaction. While they exhibit an accelerating effect for the backward reaction. These results were reasonably accounted for with electrostatic interaction.

Key words: Micelle, Premicelle, Micellar catalysis, Malachite green, Composite reaction, SDS(Sodium dodecyl sulphane)