Figure 4.

(A) Minimum LAP concentration required to achieve full photopolymerization under different nitrogen pressures. As the nitrogen purge pressure is increased, the residual oxygen in the system decreasing, thus requiring decreased photoinitiator concentrations for full polymerization. (B) Post-encapsulation viability of cells with different LAP concentration at a constant nitrogen pressure (PN₂ = 7 psi) in the nitrogen prepurged microfluidic device. (C) Post-encapsulation viability of cells was assayed by live–dead stain (live cells are green, dead cells are red).