Ordered self-assembly
of small organic molecules may induce novel
properties in a supramolecular arrangement and can act as advance
functional materials. This paper discusses the development of a new
stimuli-responsive dipeptide hydrogelator containing
l
-phenylalanine
and α-aminoisobutyric acid (Aib). The dipeptide Boc-Phe-Aib-OH,
on addition with three equivalent of sodium hydroxide and water, transformed
into a robust hydrogel. The transparent hydrogel is self-healing in
nature. The instant gelation is highly selective toward sodium hydroxide
and does not need any sonication or heating–cooling cycle.
The thixotropic nature of the gel has been confirmed by rheological
step-strain experiments at room temperature. Moreover, in the oil–water
mixture, the compound exhibits phase-selective gelation. When the
gel cylinder is cut into pieces, it does not conduct electricity,
but once self-healing occurs, it conducts electricity. The diffusion
of rhodamine 6G through the hydrogel indicates the dynamic nature.
The hydrogel is highly sensitive toward HCl, that is, in the presence
of HCl vapor, the gel becomes deformed.
The peptide based super-gelators are highly soluble in non-toxic organic solvent ethanol, the solution is easy to handle and just by spraying the ethanol solution over an oil–water mixture it is able to form an organogel at room temperature.
Aggregation of proteins and peptides into fibrils are associated with many neurodegenerative disease of human, including Alzheimer’s disease, Parkinson’s disease and non-neurological type-II diabetes. Better understanding of the fibril formation...
Urea modified tryptophan has been used as an in situ reducing and stabilizing agent for the fabrication of gold nanoparticles and the gold nanoparticles efficiently catalyzed the Suzuki–Miyaura cross-coupling reaction in water.
A series of discotic tripeptides containing a rigid aromatic core and L-phenylalanine have been developed. The orientation of the amide bonds yielded variation of structure and self-assembly propensities of the...
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