title: A hydro/organo/hybrid gelator: a peptide lipid with turning aspartame head groups.
abstract: This work presents a novel bola-type peptide lipid which can gelate water, organic solvents, and water/organic-solvent mixtures. In its molecular structure, an amphiphilic dipeptide aspartame (L-α-aspartyl-L-phenylalanine methyl ester) is connected at both ends of an alkylene linker. The different morphologies in the hydrogel (helical nanotapes) and the organogel (tape-like nanostructures) were visualized by energy-filtering transmission electron microscopy (EF-TEM) and energy-filtering scanning electron microscopy (FE-SEM), and the molecular arrangement was examined using X-ray diffraction (XRD), infrared (IR) spectroscopy, and circular dichroism (CD) spectroscopy. Possessing a hydrophilic aspartic acid group and a (relatively) hydrophobic phenylalanine methyl ester group, the dipeptide head group can turn about in response to solvent polarity. As a consequence, the solvent condition changed the molecular packing of the gelator and affected the overall supramolecular structure of the gel. It is noted that the peptide lipid gelated mixed solvents of water and organic solvents such as dichloromethane, liquid-paraffin, olive-oil, silicone-oils, and so on. The present hybrid gel can simultaneously hold hydrophilic and hydrophobic functional materials.
authors: Nanotube Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, Tsukuba, Ibaraki, Japan. mukai-m@aist.go.jp
authors: Masaru
authors: M
authors: Mukai
authors: Hiroyuki
authors: H
authors: Minamikawa
authors: Masaru
authors: M
authors: Aoyagi
authors: Masumi
authors: M
authors: Asakawa
authors: Toshimi
authors: T
authors: Shimizu
authors: Masaki
authors: M
authors: Kogiso
mesh_terms: D001218:Aspartame / Q000737:chemistry*; D002942:Circular Dichroism; D005782:Gels / Q000737:chemistry*; D008055:Lipids / Q000737:chemistry*; D009930:Organic Chemicals / Q000737:chemistry; D010455:Peptides / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D005782:Gels; D008055:Lipids; D009930:Organic Chemicals; D010455:Peptides; D001218:Aspartame