An interplay between electrostatic and polar interactions in peptide hydrogels.

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TitleAn interplay between electrostatic and polar interactions in peptide hydrogels.
Publication TypeJournal Article
Year of Publication2013
AuthorsJoyner, K, Taraban, MB, Feng, Y, Y Yu, B
JournalBiopolymers
Volume100
Issue2
Pagination174-83
Date Published2013 Apr
ISSN1097-0282
KeywordsHydrogels, Peptides, Rheology, Scattering, Small Angle, Static Electricity, X-Ray Diffraction
Abstract

Inherent chemical programmability available in peptide-based hydrogels has allowed diversity in the development of these materials for use in biomedical applications. Within the 20 natural amino acids, a range of chemical moieties are present. Here we used a mixing-induced self-assembly of two oppositely charged peptide modules to form a peptide-based hydrogel. To investigate electrostatic and polar interactions in the hydrogel, we replace amino acids from the negatively charged acidic glutamic acid (E) to the uncharged polar glutamine (Q) on a negatively charged peptide module, while leaving the positively charged module unchanged. Using dynamic rheology, the mechanical properties of each hydrogel were investigated. It was found that the number, but not the location, of electrostatic interactions (E residues) dictate the elastic modulus (G') of the hydrogel, compared to polar interactions (Q residues). Increased electrostatic interactions also promote faster peptide assembly into the hydrogel matrix, and result in the decrease of T2 relaxation times of H2 O and trifluoroacetic acid. Small-angle X-ray scattering (SAXS) showed that changing from electrostatic to polar interactions affects the ability to form fibrous networks: from the formation of elongated fibers to no fiber assembly. This study reveals the systematic effects that the incorporation of electrostatic and polar interactions have when programmed into peptide-based hydrogel systems. These effects could be used to design peptide-based biomaterials with predetermined properties.

DOI10.1002/bip.22194
Alternate JournalBiopolymers
PubMed ID23616100
PubMed Central IDPMC3869455
Grant ListR01 EB004416 / EB / NIBIB NIH HHS / United States
EB004416 / EB / NIBIB NIH HHS / United States