linoleic-acid and thionyl-chloride

A novel sodium N-fatty acyl amino acid (SFAAA) surfactant was synthesized using pupa oil and pupa protein hydrolysates (PPH) from a waste product of the silk industry. The aliphatic acids from pupa oil were modified into N-fatty acyl chlorides by thionyl chloride (SOCl2). SFAAA was synthesized using acyl chlorides and PPH. GC-MS analysis showed fatty acids from pupa oil consist mainly of unsaturated linolenic and linoleic acids and saturated palmitic and stearic acids. SFAAA had a low critical micelle concentration, great efficiency in lowering surface tension and strong adsorption at an air/water interface. SFAAA had a high emulsifying power, as well as a high foaming power. The emulsifying power of PPH and SFAAA in an oil/water emulsion was better with ethyl acetate as the oil phase compared to n-hexane. The environment-friendly surfactant made entirely from silkworm pupae could promote sustainable development of the silk industry.

Topics: alpha-Linolenic Acid; Amino Acids; Animals; Bombyx; Chromatography, Gas; Green Chemistry Technology; Insect Proteins; Linoleic Acid; Micelles; Palmitic Acid; Protein Hydrolysates; Pupa; Silk; Spectroscopy, Fourier Transform Infrared; Stearic Acids; Sulfur Oxides; Surface Tension; Surface-Active Agents; Waste Products