Differently N-Capped Analogues of Fmoc-FF

Area of Science:

• Supramolecular chemistry
• Materials science
• Biomaterials engineering

Background:

• Short and ultra-short peptides are promising building blocks for hydrogel formulation.
• Fmoc-FF (Nα-fluorenylmethoxycarbonyl-diphenylalanine) is a well-studied low molecular-weight hydrogelator due to its physiological gelling properties.
• Numerous Fmoc-FF analogues have been synthesized to create novel supramolecular materials.

Purpose of the Study:

• To describe Fmoc-FF analogues where the aromatic Fmoc group is substituted.
• To categorize these analogues into five distinct classes based on their modifications.
• To investigate the impact of these substitutions on the morphological, mechanical, and functional properties of the resulting hydrogels.

Main Methods:

• Synthesis of Fmoc-FF analogues with diverse substituents replacing the aromatic Fmoc group.
• Classification of analogues into five categories: protected groups, non-aromatic, aromatic, metal complexes, and stimuli-responsive.
• Characterization of the morphological, mechanical, and functional properties of the derived hydrogels.

Main Results:

• Successfully synthesized and categorized five classes of Fmoc-FF analogues.
• Demonstrated that modifications to the Fmoc group significantly alter hydrogel properties.
• Detailed the specific effects of different substituent types on material morphology, mechanics, and function.

Conclusions:

• Substitution of the Fmoc group offers a versatile strategy for tuning peptide-based hydrogel properties.
• The five classes of analogues provide a framework for designing tailored supramolecular materials.
• These modified hydrogels hold potential for various advanced applications requiring specific material characteristics.