Vortex-Induced Injectable Silk Fibroin Hydrogels

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Vortex-Induced Injectable Silk Fibroin Hydrogels Tuna Yucel, Peggy Cebe, David L. Kaplan Biophysical Journal Volume 97, Issue 7, Pages 2044-2050 (October 2009) DOI: 10.1016/j.bpj.2009.07.028 Copyright © 2009 Biophysical Society Terms and Conditions

Figure 1 (A) Far-UV CD spectra collected immediately after vortexing silk solutions for different durations, tV. (B) Correlation between the time evolution of the increase in [θ]216 measured by CD and the shear storage modulus, G′ measured by dynamic oscillatory rheology during postvortex incubation. Rheology frequency sweeps of (C) storage and (D) loss modulus collected at different postvortex assembly times, tA, under the same assembly conditions as in panel B. The frequency sweep data collected from nonvortexed silk solution was also given in panels C and D for comparison (+). Biophysical Journal 2009 97, 2044-2050DOI: (10.1016/j.bpj.2009.07.028) Copyright © 2009 Biophysical Society Terms and Conditions

Figure 2 Controlling hydrogelation kinetics by vortex time (A and B), assembly temperature (C and D), and protein concentration (E and F) (see text for experimental details and assembly conditions). Power law exponents in panel A were obtained from fits to G′ data immediately after the apparent percolation. Biophysical Journal 2009 97, 2044-2050DOI: (10.1016/j.bpj.2009.07.028) Copyright © 2009 Biophysical Society Terms and Conditions

Figure 3 Strain sweeps (A and B) collected from vortex-induced hydrogels with different silk concentrations (arrows show apparent yielding). Frequency (C and D) sweeps collected from the hydrogels before (open symbols) and immediately after shear-thinning by injection through a 21-gauge needle (solid symbols). Biophysical Journal 2009 97, 2044-2050DOI: (10.1016/j.bpj.2009.07.028) Copyright © 2009 Biophysical Society Terms and Conditions