BINDING OF SODIUM DODECYL-SULFATE TO A POLYELECTROLYTE BASED ON CHITOSAN

The binding behavior of sodium dodecyl sulfate (SDS) to cationic chito san in free solution is described. Binding isotherms were determined p otentiometrically. The results are rationalized by a cooperative bindi ng model for a heterogeneous polyelectrolyte with ionic sequences and nonionic sequences. A theoretical expression for the binding isotherm of a random copolymer is obtained by using Lifson's sequence-generatin g function (SGF) method. The same binding constant K for chitosan with various degrees of N-acetylation (da) was estimated for the presented model calculation.