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Surface active N‐acylglutamate: II. Physicochemical properties of long chain N‐acylglutamic acids and their sodium salts
Author(s) -
Takehara Masahiro,
Moriyuki Hirofumi,
Yoshimura Ippei,
Yoshida Ryonosuke
Publication year - 1972
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02633782
Subject(s) - krafft temperature , chemistry , surface tension , solubility , aqueous solution , hydrolysis , critical micelle concentration , micelle , sodium , long chain , salt (chemistry) , inorganic chemistry , organic chemistry , physics , quantum mechanics , polymer science
The physicochemical properties of long chain N‐acylglutamic acids (AGA) and their sodium salts (AGS n ) are described. The solubility, Krafft point, pH value, critical micelle concentration, surface tension and foaming power were measured. The properties of the optically active AGA or AGS n differed from those of the corresponding racemates, especially in solubility. The monosodium salts generally had high Krafft points, but monosodium N‐oleoylglutamate had a low Krafft point. The monosodium salts hydrolyzed in the diluted aqueous solution to liberate the AGA. The aqueous solutions of the monosodium salts had low surface tensions and good foaming properties. The disodium salts were highly soluble in water, while surface tensions and foaming properties were inferior to those of the corresponding monosodium salts.