Table 1.

Precision and accuracy evaluation (n = 3).

	DPPH Reduction
Level	Quercetin (μg/mL)	%RSD (Intra-day)	%RSD (Inter-day)	%error
High	8	1.75	2.64	1.55
Medium	4	6.80	6.79	–5.19
Low	0.5	1.57	2.64	–5.81
	ABTS Reduction
Level	Trolox (μg/mL)	%RSD (Intra-day)	%RSD (Inter-day)	%error
High	5	6.34	0.77	–0.20
Medium	3	2.32	1.62	–1.98
Low	1	9.75	3.02	–1.82