Fig. 1. Characteristic portraits of scaffolds. (a) Gross observation of blank CCS and NAg-CCS in a 24-well plate. (b) Microstructures of blank CCS and NAg-CCS under scanning electron microscopy with three different magnifications. (c) Cumulative release of NAg within two weeks; the mixed NAg in blank CCS exhibited a sudden release on Day 1, while a slow and sustained release of NAg was observed in the NAg-CCS group ((50.55±3.29)% vs. (10.34±1.88)%, ^*** P<0.001). (d) Degradation rates of blank CCS and NAg-CCS, with no significance (NS) in Week 7 ((96.15±2.04)% vs. (93.75±1.23)%, P ˃ 0.05). Data are expressed as mean±standard deviation (SD), n=3. NAg: nanosilver; CCS: collagen-chitosan scaffold.