Fig. 4

Ions release behaviour. Cumulative Fe2+, Fe3+ and Zn2+ release curves of PB, ZnPB-1 and ZnPB-3 (200 p.p.m.) at 37 °C in PBS for short-term release (1 day) and long-term release (1 week). Short-term released ions (1 day) are mainly from interstitial site and long-term released ions (1 week) are mainly from lattice site. Error bars indicate means ± standard deviations (n = 2 independent samples). Source data are provided as a Source Data file