Laurylether sulfate

A characteristic example in the field of cosmetics is the separation and determination of surfactants in shampoos, which contain various combinations of anionic, cationic, nonionic, and amphoteric surfactants. The surfactant combination is designed to influence the essential characteristics of the shampoo cleansing, foam, conditioning, and viscosity. Laurylether sulfates and alkylben-zene sulfonates are common anionic surfeictants used in shampoos to provide lather and cleansing. The only required sample preparation step is the dilution of the product to be analyzed in deionized water and subsequent membrane filtration (0.45 pm) prior to injection. Figure 10.200 illustrates the gradient... 

The effect of surfactants on the degradation of pi-lactam antibiotics is difficult to interpret. As shown in Fig. 116, acid degradation of propicillin in solutions was inhibited by polyoxyethylene-23-laurylether (a nonionic surfactant) and CTAB (a cationic surfactant) but enhanced by sodium lauryl sulfate (an anionic surfactant).485 Degradation of cefaclor (an a-aminophenyl cepalosporin) was enhanced by CTAB. The dependence on salt concentration suggests a complex mechanism for the effect of surfactants on degradation of cefaclor.486... 

Figure 116. Effect of surfactants on the degradation of propicillin at 37°C. , Polyoxyethylene-23-laurylether, pH 1.10 A, sodium lauryl sulfate, pH 3.00 CTAB, pH 1.10. (Reproduced from Ref. 485 with permission.)...

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