Table 5. Inhibitory effect of paper mulberry leaf extracts on PPO activity

Samples	Concentration(mg/mL)	Inhibition rate (%)	IC₅₀(mg/mL)²⁾
PMEW	0.5	10.26±0.64^d1)	2.45±0.04^a
	1	15.75±1.80^cd	2.45±0.04^a
	2	29.81±1.07^c	2.45±0.04^a
PME30	0.5	6.49±1.63^d	2.67±0.02^a
	1	6.27±0.19^d	2.67±0.02^a
	2	20.68±0.48^cd	2.67±0.02^a
PME70	0.5	24.26±2.01^cd	1.16±0.26^b
	1	47.34±20.71^b	1.16±0.26^b
	2	86.51±19.72^a	1.16±0.26^b

All values are mean±SD (n≥3), and different superscripts (^a-d) in the same column are significantly different at p<0.05 by Duncan’s multiple range test.
Concentration required for 50% inhibition of PPO activity.
PMEW, the water extract; PME30, the 30% ethanol extract; PME70, the 70% ethanol extract.