Changes in the Properties of N-Lauroyl-L-glutamate with Neutralization

Examination was made of changes in the properties of N-Lauroyl-L-glutamate (LGA) with neutralization. Foaming power was maximum at neutralization of 1.6, and emulsification capacity decreased with neutralization. 13C-NMR indicated α-carboxylic acid of LGA to be neutralized predominantly, and γ-carboxylic acid to be so in proportion to neutralization at 1.6. Fluorescence probe application showed micropolarity and aggregation number of micelles to increase rapidly at neutralization of 1.6. α-carboxylic acid of LGA would thus appear to contribute to interactions between LGA molecules.