title: Transition of Phase Structures in Mixtures of Lysine and Fatty Acids.
abstract: Aggregation behaviors of the mixtures of lysine and fatty acids (FAs) with different chain lengths in aqueous solutions were investigated, and the self-assembled structural transition was determined in detail. Aggregates including micelles, vesicles, sponge structures, and fibers were observed by varying the compositions and the chain length of fatty acids. The sponge phase found in mixtures of octanoic acid and lysine was determined by freeze fracture-transmission electron microscope (FF-TEM). Circular dichroism (CD) signals were detected in the self-assembled structures due to the chirality of lysine molecules. The rheological properties of samples consisting of different aggregates formed by mixtures of lysine and fatty acids were measured, which provided the controlling factor of the chain length. The combined effect of noncovalent interactions including electrostatic interactions, hydrogen bonding, and hydrophobicity is supposed to be responsible for the aggregation behaviors, in which the hydrogen bonding acts as the main driving force in the self-assembled process.
authors.affiliation: Key Laboratory for Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education , Jinan 250100, China.
authors.forename: Guihua
authors.initials: G
authors.lastname: Li
authors.affiliation: Key Laboratory for Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education , Jinan 250100, China.
authors.forename: Yuliang
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Key Laboratory for Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education , Jinan 250100, China.
authors.forename: Wenlong
authors.initials: W
authors.lastname: Xu
authors.affiliation: Key Laboratory for Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education , Jinan 250100, China.
authors.forename: Aixin
authors.initials: A
authors.lastname: Song
authors.affiliation: Key Laboratory for Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education , Jinan 250100, China.
authors.forename: Jingcheng
authors.initials: J
authors.lastname: Hao
mesh_terms: D002942:Circular Dichroism; D005227:Fatty Acids / Q000737:chemistry*; D005614:Freeze Fracturing; D008239:Lysine / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D015394:Molecular Structure; D014867:Water / Q000737:chemistry
chemical_list: D005227:Fatty Acids; D014867:Water; D008239:Lysine