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XPS elemental spectra of AGEpp film conjugated with Herceptin under different experimental conditions. (a) Control AGEpp film; (b) AGEpp reacted for 1 h with Herceptin in PBS; (c) AGEpp reacted for 24 h with Herceptin in PBS; (d) AGEpp reacted for 1 h with Herceptin in 1M ammonium sulfate∕PBS. No significant differences were observed in the amount of immobilized antibody based on the nitrogen percentage.
