Characterization and Quantification of Luteolin-Metal Complexes in Aqueous Extract of Lonicerae Japonicae Flos and Huangshan Wild Chrysanthemum

Table 1

Effect of luteolin, metal salt and luteolin, and metal ion reaction products on clearance of DPPH free radicals.

Concentration, mmol/L	Clearance%
	Luteolin	Fe complex	Mg complex	Cu complex	Ca complex	Fe salt	Mg salt	Cu salt	Ca salt
1.0	80.27	89.69	73.44	94.63	79.46	29.81	7.00	39.39	5.70
0.1	69.66	72.66	73.30	86.54	76.02	16.9	−0.84	7.83	4.79
0.01	18.34	15.03	31.21	36.72	34.65	7.7	−1.29	0.08	4.26