Sub-micellar phases

When SAS are present in solution, pesticide compounds partition between the bulk aqueous solution and the (sub)micellar phase (Figure 17). This partitioning may affect the overall rates and products of transformation of these compounds if their rates of reaction in the (sub)micellar phase are significantly different from those in the aqueous phase (Barbash, 1987 Macalady and Wolfe, 1987 Barbash and Resek, 1996). In some cases, relatively minor variations in SAS stmcture can have substantial impacts on pesticide transformation rates (Kamiya et ai, 1994). Even if reaction rates are not substantially different in the (sub)mi-cellar phase, however, the presence of SAS may modify reaction rates in solution for sparingly soluble pesticide compounds by simply increasing their dissolved concentrations, as may occur in the presence of polar solvents (e.g., Barbash and Reinhard, 1989a Schwarzenbach et al. 

Wei et ai, 2000). Rates of biotransformation may be either increased or decreased by partitioning into a (sub)micellar phase, depending upon the effect of the particular SAS on bioavailability, and the nature of the microorganisms involved (Guha and Jaffe, 1996). 

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See also in sourсe #XX -- [ , ]

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