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. Author manuscript; available in PMC: 2018 Oct 1.
Published in final edited form as: Adv Healthc Mater. 2017 Sep 25;6(19):10.1002/adhm.201700718. doi: 10.1002/adhm.201700718

Figure 4.

Figure 4

Colorimetric detection of pH changes due to bacterial growth using GelDerm. A-i,ii) Measurement of pH variations with culture time for P. aeruginosa and S. aureus using commercial strips, porous sensors. B) pH values measured by a pH probe increased in P. aeruginosa cultures over time. C) Measured pH values by the porous sensors as compared to the electrochemical pH probe for P. aeruginosa cultures. D) Errors associated with the colorimetric measurement of pH in P. aeruginosa cultures as compared to values measured by a pH probe. E) pH values measured by a pH probe decreased in S. aureus cultures over time. F) Measured pH values by the porous sensors as compared to the electrochemical pH probe for S. aureus cultures. G) Errors associated with the colorimetric measurement of pH in S. aureus cultures as compared to values measured by a pH probe.