The dispersibility of sulfisoxazole, sulfadimethoxine, and N
1-acetylsulfisoxazole in aqueous sucrose solutions (0-30%) in the presence of polyoxyethylene nonyl phenyl ether (PEN) (0.05-8.0×10
-3 mole/liter) was examined on the basis of the apparent median radius (γ
med) as estimated from the particle size distribution obtained by the use of sedimentation balance, as well as the sedimentation volume and the amount of PE-N adsorbed on sulfonamides. It was found that the γ
med decresed markedly in a PE-N concentration range of 4-6×10
-4 mole/liter, and showed a minimum at about 1×10
-3 mole/liter, and that the sedimentation volume was also reduced markedly in the same conecntration range of PE-N and then levelled off. Influence of the presence of sucrose on γ
med and sedimentation volume was observed only with N
1-acetylsulfisoxazole, both of which increased with the sucrose concentration. From these results it was concluded that the dispersive sedimentation of sulfonamides began at the PE-N concentration of about 1×10
-3 mole/liter, and the dispersibility rather decreased by the addition of sucrose. Correlation between dispersibility and amout of PE-N adsorbed on the sulfonamides was examined. It was found that the saturated amout of PE-N adsorbed on the sulfonamides was almost monolayer saturated adsorption, and the dispersive sedimentation began on the monolayer saturated adsorption.
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