Table 1.

Antioxidant activity against ABTS and DPPH of the potassium quercetin derivative, expressed as a percentage of the standard substance activity. Lowercase letters indicate significant differences between the means at respective measurement according to t-Student’s test (p = 0.05).

Method	Antioxidant Activity of the Preparation Expressed as:
	% of Quercetin Activity	% of Trolox Activity	% of Ascorbic Acid Activity
ABTS	67.02 ± 4.21 a	104.01 ± 1.75 a	145.34 ± 4.56 b
DPPH	33.43 ± 2.26 a	94.12 ± 6.43 a	110.23 ± 4.85 b