Figure 4
From: Long-Term Maintenance of Human Pluripotent Stem Cells on cRGDfK-Presenting Synthetic Surfaces
Characterisation of the chemical properties of PAPA coatings used for hPSC culture. (A) High resolution C 1 s XPS spectra for the TCPS surface and (B) a PAPA coated surface of 25 cm2 flasks. Here C1 and C2 refer to primary and secondary shifted C-C/C-H groups respectively, C3 refers to C-O/C-N groups, C4 refers to C=O/N-C=O groups, C5 refers to O-C=O groups and C6, C7 and C8 arise from the presence of aromatic carbon (very evident in TCPS). (C) XPS surface analysis results obtained for TCPS T25 surfaces and PAPA surfaces. The top half of the table contains quantitative elemental analysis results and elemental ratios whereas the lower half of the table contains the results from curve-fitting high-resolution C 1 s spectra (the Cx labels have the same significance as those in parts A and B containing example C 1 s spectra).
