DPPH radical-scavenging activities of luteolin and glucosides.

Compounds	Free OH	IC50 (μM)
Luteolin	5, 7, 3′, 4′	20.2
Luteolin 3′-O-β-glucoside	5, 7, 4′	>100
Luteolin 4′-O-β-glucoside	5, 7, 3′	>100
Luteolin 7-O-β-glucoside	5, 3′, 4′	21.2
Luteolin 7,3′-di-O-β-glucoside	5, 4′	>100
Luteolin 7,4′-di-O-β-glucoside	5, 3′	>100