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. Author manuscript; available in PMC: 2020 Sep 10.
Published in final edited form as: Lab Chip. 2019 Sep 10;19(18):3022–3031. doi: 10.1039/c9lc00354a

Figure 4. Oxygen gradient generation in the microfluidic device.

Figure 4.

(A) Representative oxygen gradient profile measured by the Visisens oxygen detection system. Inlet 1: 0% sulfite/0 μM cobalt and inlet 2: 0.13% sulfite/13 μM cobalt. (B) The descending oxygen levels along the culture chamber with increasing sulfite/cobalt concentrations. An oxygen gradient of 11.2% – 6.9% was generated.