Viscoelastic properties.

<p>(A) Start of gelation. Gelation points deduced from crosspoints of G′ and G″ (circles with arrows); quattroGel showed a delayed gelation (360 sec) compared to gelatin gel (252 sec). (B) End of Gelation. <i>Oscillatory time sweeps</i> to unravel gelation kinetics of the gelatin gel (black) and quattroGel (red) over 2 h at 37°C. Both gels showed typical asymptotic graphs with gelation essentially finalized after about 1 h (plateau phase). (C) Viscoelasticity. <i>Frequency sweep</i> after curing of the gels revealed semi-rigid, elastic properties for both gels as deduced from storage moduli (upper curves) two orders higher than the corresponding loss moduli (lower curves). n = 3.