Table 3.

Effect of inhibitors on sweet potato polyphenol oxidase. K_m, V_max, K_i and I₅₀ values were shown

Inhibitors	[I] (mg/mL)	I50 (mg/mL)	Inhibition (%)	Vmax (EU/min/mL)	Km (mM)	Ki (mM)	Type of inhibition
Control			–	43,264.76	11.67
Sonneratia.alba	0.125	0.081	55.14	17,232.08	4.78	0.08	Un-competitive
	0.25		78.57	8,203.78	2.68	0.06
	0.5		82.00	7,421.59	2.50	0.10
Rhizophora apiculate	0.125	0.217	40.86	24,854.79	6.11	0.17	Un-competitive
	0.25		58.29	17,105.07	4.28	0.16
	0.5		62.29	14,960.92	3.71	0.26
Syzygium grande	0.125	0.286	37.14	26,418.06	6.34	0.20	Un-competitive
	0.25		54.00	18,898.59	4.17	0.19
	0.5		59.71	17,217.78	3.68	0.33
Rhizophora mucronata	0.125	0.385	32.00	26,017.07	11.70	0.08	Non-competitive
	0.25		44.29	20,816.98	11.76	0.23
	0.5		56.29	17,183.19	11.72	0.33
Hibiscus tiliaceus	0.125	0.633	24.00	32.819.17	13.67	0.39/1.54	Mixed
	0.25		33.71	29,392.49	14.18	0.53/1.79
	0.5		42.86	20,497.77	15.64	0.45/2.82
Bruguiera gymnorhiza	0.125	0.673	24.29	29,230.62	11.67	0.26	Non-competitive
	0.25		39.14	24,382.57	11.59	0.32
	0.5		41.14	19,483.80	11.68	0.41