Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (07): 577-579.doi: 10.3866/PKU.WHXB20030701

• Communication •     Next Articles

Aqueous Two-phase System of Catanionic Surfactant Mixtures Formed by Adding Salts

Chen Li;Xiao Jin-Xin;Ma Ji-Ming   

  1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871
  • Received:2003-04-11 Revised:2003-04-29 Published:2003-07-15
  • Contact: xiaojx@chem.pku.edu.cn E-mail:Xiao Jin-Xin

Abstract: The equimolar mixed system of decyltriethylammonium bromide and sodium decylsulfonate, which was homogeneous solution even with the total surfactant concentration increasing up to 0.2 mol•L-1, formed aqueous two-phase system(ATPS) when salts, such as NaF, Na2SO4 or Na3PO4, were added. The phase behavior and partitioning of BSA in this saltinduced ATPS were studied. Compared with the usual ATPS of catanionic surfactant mixtures, this salt-induced ATPS exhibited some special advantages, and overcame some shortcomings of the usual ATPS. It was shown that the phase behavior of this salt-induced ATPS could be adjusted by adding salts and the partition coefficient of BSA could be altered and optimized by salt species.

Key words: Catanionic surfactant mixtures, Aqueous two-phase system(ATPS),  Protein partitioning