Table 2.

Apoptotic rates of HAP nanoparticles on hepatoma cell line BEL-7402

Concentrations (mg/L)	Apoptotic rate (%)	t vs control
0(control)	2.23 ± 0.14
50	20.35 ± 2.23b	13.32
75	25.35 ± 1.92b	22.55
100	29.34 ± 4.61b	10.50
150	44.92 ± 3.78bc	20.30
200	53.64 ± 3.49bd	24.51

^aP < 0.05,

^bP < 0.01 vs 0 mg/L group;

^cP < 0.05,

^dP < 0.01 vs 50 mg/L group.