Table 3.

Precision and accuracy of the HPLC method for the determination of curcuminoids.

		CUR			BDMC			CAT
	Level (µg/mL)	Recovery (µg/mL)	RSD (%)	RE (%)	Recovery (µg/mL)	RSD (%)	RE (%)	Recovery (µg/mL)	RSD (%)	RE (%)
Intra-day (n = 3)	3.125	3.118 ± 0.01	0.35	0.23	3.128 ± 0.01	0.39	−0.08	3.134 ± 0.01	0.18	−0.28
	0.781	0.779 ± 0.01	0.65	0.24	0.760 ± 0.02	2.29	2.78	0.778 ± 0.01	1.91	0.41
	0.195	0.210 ± 0.02	9.83	−7.53	0.219 ± 0.00	2.02	−12.36	0.211 ± 0.01	5.24	−8.20
Inter-day (n = 6)	3.125	3.131 ± 0.00	0.11	−0.18	3.137 ± 0.01	0.19	−0.38	3.128 ± 0.01	0.24	−0.11
	0.781	0.775 ± 0.01	1.22	0.84	0.767 ± 0.01	1.09	1.86	0.776 ± 0.01	1.45	0.68
	0.195	0.209 ± 0.01	2.94	−6.84	0.222 ± 0.00	1.30	−13.49	0.199 ± 0.01	5.69	−1.88

Recovery = Measured concentrations. Values represent means ± SD; RSD = Relative standard deviation; RE = Relative error.