アミノ酸系界面活性剤 (第6報)

N^ε-アシルリシンの合成及びそのエチレンオキシド付加物の界面化学的性質

抄録

Synthesis and surface activities of the N^ε -acyl-L-lysine and their derivatives were investigated. The N^ε -acyl-L-Lys were selectively obtained from fatty acid salts of Lys by the thermal dehydration. This method is superior in selectivity and convenience to the usual methods for the selective acylation of the ε-amino group in Lys, because the usual methods need to protect the α-amino group against the acylation and also to use special acylating agents such as acyl chloride or p-nitrophenyl ester of fatty acid.
The N^ε lauroyl-L-Lys was less soluble into water in spite of its amphoteric structure, and ethylene oxide (EO) was added to increase the solubility.
Wetting power, foaming power, emulsifying powe rand detergency of EO adducts of N^ε -lauroyl-L-Lys were measured. Wetting power varied with pH like usual amphoteric surfactants, but the variation decreased with increasing of the number of EO.