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Gelation of Fmoc-diphenylalanine is a first order phase transition

Journal Article · · Soft Matter
DOI:https://doi.org/10.1039/c5sm01399b· OSTI ID:1875441
 [1];  [2]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States); University of Illinois
  2. Univ. at Buffalo, NY (United States)
We explore the gel transition of the aromatic dipeptide derivative molecule fluorenylmethoxycarbonyl-diphenylalanine (Fmoc-FF). The addition of water to a solution of Fmoc-FF in dimethyl sulfoxide (DMSO) results in increased attractions leading to self-assembly of Fmoc-FF molecules into a space-filling fibrous network. We provide evidence that gel formation is associated with a first order phase transition resulting in nucleation and growth of strongly anisotropic crystals with high aspect ratios. The strength of attraction between Fmoc-FF molecules as a function of water concentration is estimated from long-time self-diffusion measurements using 1H NMR diffusion-ordered spectroscopy (DOSY). The resulting phase behavior follows that observed for a wide range of other crystallizing nanoparticles and small molecules – a result consistent with the short-range nature of the intermolecular attractions. Furthermore, we use NMR to measure the rate of increase in the fraction of bound Fmoc-FF molecules after water is suddenly mixed into the system. We observe a lag time in the formation of the new phase indicative of the existence of a free energy barrier to the formation of a crystal nucleus of critical size. Furthermore, the application of classical nucleation theory for a cylindrical nucleus indicates that one-dimensional crystal growth is driven by an imbalance of the surface energies of the ends and sides of the fiber.
Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
FG02-07ER46471
OSTI ID:
1875441
Journal Information:
Soft Matter, Journal Name: Soft Matter Journal Issue: 38 Vol. 11; ISSN 1744-683X
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Using Aggregation-Induced Emission to Understand Dipeptide Gels journal February 2018
The Phe-Phe Motif for Peptide Self-Assembly in Nanomedicine journal November 2015
Expanding the Functional Scope of the Fmoc‐Diphenylalanine Hydrogelator by Introducing a Rigidifying and Chemically Active Urea Backbone Modification journal April 2019
Amyloid-Like Fibrillary Morphology Originated by Tyrosine-Containing Aromatic Hexapeptides journal April 2018
Self-assembly pathways and polymorphism in peptide-based nanostructures journal January 2018
Supramolecular gelatons: towards the design of molecular gels journal January 2018

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