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FESEM micrographs showing individual effects of Fe3+ and Mg2+ on CA NPs. Scale bar: 500 nm, and 1 µm. (A) Fe-CA (B) Mg-CA. After the respective particles were incubated and supplemented with 10% FBS, they were centrifuged twice for 15 min at 13,000 rpm. The supernatants were discarded and the pellets were resuspended in 20 µL Milli Q water. Then 3 µL of the respective NP suspensions was dried at room temperature for 45 min.
