Table 2.

Characteristic values of Dixon and Cornish-Bowden plots for the DPP-4 inhibition by hyperoside, myricetin, narcissoside, cyanidin 3-O-glucoside, and isoliquiritigenin.

Flavonoid	Inhibition type	Kic (10−5 mol L−1)	Kiu(10−5 mol L−1)	1/Kic (104 L mol−1)	1/Kiu (104 L mol−1)
Hyperoside	Mixed	9.03 ± 0.10	14.8 ± 0.22	1.10 ± 0.01	0.67 ± 0.01
Myricetin	Non-competitive	10.35 ± 0.11	10.35 ± 0.11	0.97 ± 0.00	1.01 ± 0.01
Narcissoside	Mixed	11.57 ± 0.21	22.3 ± 0.15	0.86 ± 0.02	0.44 ± 0.03
Cyanidin 3-O-glucoside	Mixed	7.43 ± 0.12	18.37 ± 0.24	1.30 ± 0.02	0.57 ± 0.03
Isoliquiritigenin	Mixed	9.82 ± 0.34	26.7 ± 0.34	1.01 ± 0.03	0.37 ± 0.01