硫酸ドデシルナトリウムによる脂肪酸汚れの洗浄

可溶化による除去

抄録

Removal of myristic acid by aqueous SDS solution was investigated, directing attention to solubilization as a removal mechanism. Removal after 5h by SDS solution at various concentrations and 30°C was clearly correlated to the limit of solubilization, A (sat) linearly related to the concentration of SDS. Thus, removed myristic acid soil is solubilized in SDS micelles. The value of β, determined from a plot of removal against log t (t=washing time), increased with the concentration of SDS. Linearity in a reciprocal plot of β against 1/A (sat) indicated that, during a short time, myristic acid was removed by solubilization.
The effects of temperature on solubilization and the removal of myristic acid were also studied. At equilibrium, a clear isotropic solution was obtained at 20-35°C, while opaque white dispersions were noted above 40°C. The latter system appeared assignable to dispersions of ternary liquid crystalline (myristic acid-SDS-water), LC, since the temperature (Tp) at which SDS-water penetrated solid myristic acid was 38.5°C for the 0.5% SDS system. The removal of myristic acid improved with increase in washing temperature, and that after 5 h at 20-35°C was quite similar to that expected from the limit of solubilization. However, above the penetration temperature, removal rapidly increased more than that expected from solubilization. The dispersion of LC was considered a possible cause for this.