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. Author manuscript; available in PMC: 2010 Apr 15.
Published in final edited form as: Biosens Bioelectron. 2009 Jan 31;24(8):2604–2610. doi: 10.1016/j.bios.2009.01.029

Figure 4.

Figure 4

(A) Time-dependent increase in fluorescence intensity of hydrogel microstructures in the presence of 5 or 20 μM H2O2 and 50 μM Amplex Red. (B–C) Fluorescence images of hydrogel microstructures after 5 min incubation with 5 μM H2O2 (B) and 20 μM H2O2 (C) in the presence of Amplex Red. When sensing for cell-secreted H2O2 images were collected 5 min after introduction of Amplex Red into cell culture medium.