Interactions between b-Cyclodextrin and some Sodium Alkyl Sulfates and Sulfonates as Seen by Electrical Conductivity Measurements

 

Artur J.M. Valente,* Carlos J.S. Dinis, Rui F.P. Pereira, Ana C.F. Ribeiro, Victor M.M. Lobo

 

Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal

 

Received 13 May 2005

 

 

Abstract

A conductivity technique has been developed, being highly useful for studying the association behaviour of cyclodextrins (CDs) with surfactants. In this paper, the complexation of b-cyclodextrin with alkyl sulfonates and alkyl sulfates with different carbon chains (from 10 to 16) is analysed. The effect of the ionic head group in the most hydrophobic surfactant is also analysed. The association constants for 1:1 and 1:2 complexes are calculated on the basis of a second and a third degree equation; in the latter a real solution of a Cardin-Tartagliae formula is applied to solve the third degree equation.

Keywords: b-cyclodextrin, surfactants, conductivity, association constants.

 

 

Texto complete disponível em PDF

Full text only in PDF format

 

 

References

1.      S. Li, W.C. Purdy, Chem. Rev. 92 (1992) 1457.        [ Links ]

2.      V.C. Reinsborough, Langmuir 11 (1995) 2476.        [ Links ]

3.      E. Junquera, L. Pena, E. Aicart, Langmuir 11 (1995) 4685.         [ Links ]

4.      N.M. Gorman, J. Laynez, A. Schon, J. Suurkusk, I. Wadso, J. Biochem. Biophys. Methods 10 (1984) 187.        [ Links ]

5.      A.J.M. Valente, M. Nilsson, O. Söderman, J. Colloid Interf. Sci. 281 (2005) 218.         [ Links ]

6.      K. Uekama, F. Hirayama, T. Irie, Chem. Rev. 98 (1998) 2045.        [ Links ]

7.      T. Zelinski, A. Liese, C. Wandrey, M.-R. Kula, Tetrahedron Asymmetry 10 (1999) 1681.        [ Links ]

8.      M. Guyot, F. Fawaz, J. Bildet, F. Bonini, A.M. Laguen, Int. J. Pharm. 123 (1995) 53.        [ Links ]

9.      M. Nstoli, V. Pagliero, F. Trotta, E. Drioli, J. Mol. Catal. A Chem. 121 (1997) 179.        [ Links ]

10.    S. Lis, M. Elbanowski, B. Makawska, Z. Hnatejko, J. Photochem. Photobiol. A Chem. 150 (2002) 233.        [ Links ]

11.    S. Letellier, B. Maupas, J.P. Gramond, F. Guyon, P. Garei, Anal. Chim. Acta 315 (1995) 357.        [ Links ]

12.    B.S. Jursic, Z. Zdravkovski, A.D. French, J. Mol. Struct. THEOCHEM 366 (1996) 113.        [ Links ]

13.    I. Satake, T. Ikenoue, T. Takeshita, K. Hayakawa, T. Maeda, Bull. Chem. Soc. Jpn. 58 (1985) 2746.        [ Links ]

14.    I. Satake, S. Yoshida, K. Hayakawa, T. Maeda, Y. Kusumoto, Bull. Chem. Soc. Jpn. 59 (1986) 3991.        [ Links ]

15.    R. Palepu, J.E. Richardson, V.C. Reinsborough, Langmuir 5 (1989) 218.        [ Links ]

16.    D.J. Jobe, V.C. Reinsborough, S.C. Wetmore, Langmuir 11 (1995) 2476.        [ Links ]

17.    L. Karlson, C. Malmborg, K. Thuresson, O. Söderman, Colloids Surf. A Physicochem. Eng. Aspects 228 (2003) 171.        [ Links ]

18.    A.C.F. Ribeiro, A.J.M. Valente, E.F.G. Azevedo, A.M. Amado, A.M. Amorim da Costa, M.L. Ramos, H.D. Burrows, J. Mol. Struct. 703 (2004) 93.        [ Links ]

19.    P. Mukerjee, K.J. Mysels. In “Critical Micelle Concentration of Aqueous Surfactant Systems”, National Bureau of Standards, Washington, D.C., 1971.        [ Links ]

20.    R. Palepu, V.C. Reinsborough, Can J. Chem. 66 (1988) 325.        [ Links ]

21.     A.A. Rafati, A. Bagheri, H. Iloukani, M. Zarinehzad, J. Molec. Liquids 116 (2005) 37.        [ Links ]

 

 

* Corresponding author. E-mail address: avalente@ci.uc.pt