Storage (G′) and loss (G′′) moduli for all samples were quantified through an oscillatory rheology frequency sweep. Both peptides exhibit enhanced viscoelastic properties in 10% PBS in the presence of Zn(II) when compared to the samples without Zn(II). As mentioned above, we postulate that Zn(II) can act as a cross linker agent under physiological pH, facilitated by cross strand interactions (His-Zn-His) with the peptide, leading to improved mechanical properties of hydrogels. In the absence of Zn(II), G′ values are significantly lower (Table ), consistent with the slower and more loose formation of hydrogels.