Table 3.

Intra-assay precision, inter-day precision, and recovery at three concentration levels for analytes.

Nominal Concentration (μg·mL−1)	Intra-Day Precision (n = 6)		Inter-Day Precision (n = 6)		Accuracy as Recovery (%)
	Concentration Found (±SD) (μg·mL−1)	RSD (%)	Concentration Found (±SD) (μg·mL−1)	RSD (%)
for direct determination in tablets
(S)-cetirizine
2.5	2.50 ± 0.16	6.63	2.54 ± 0.18	7.15	99.84
10	10.00 ± 0.33	3.30	10.25 ± 0.37	3.58	100.00
20	20.25 ± 0.25	1.24	20.52 ± 0.30	1.35	101.23
(R)-cetirizine
2.5	2.49 ± 0.16	6.58	2.53 ± 0.18	7.18	99.72
10	10.00 ± 0.32	3.25	10.25 ± 0.37	3.55	100.01
20	20.25 ± 0.25	1.23	20.53 ± 0.29	1.33	101.25
for determination after two-step liquid-liquid extraction from oral drops or oral solution
(S)-cetirizine
2.5	2.49 ± 0.17	6.79	2.53 ± 0.19	7.05	99.59
10	9.72 ± 0.34	3.48	9.83 ± 0.36	3.52	97.16
20	20.07 ± 0.27	1.32	20.10 ± 0.30	1.24	100.37
(R)-cetirizine
2.5	2.49 ± 0.17	6.74	2.52 ± 0.19	6.96	99.69
10	9.75 ± 0.34	3.46	9.83 ± 0.37	3.55	97.47
20	20.10 ± 0.27	1.30	20.11 ± 0.29	1.25	100.48
Paraben M
2.7	2.63 ± 0.19	7.23	2.68 ± 0.20	7.58	97.58
27	26.50 ± 0.81	3.06	27.22 ± 0.92	3.42	98.15
45	44.37 ± 0.68	1.53	44.83 ± 0.79	1.42	98.60
Paraben P
0.3	0.29 ± 0.02	7.38	0.32 ± 0.03	7.68	97.07
3.0	3.00 ± 0.10	3.37	3.11 ± 0.14	3.56	99.92
5.0	5.04 ± 0.08	1.60	5.09 ± 0.10	1.50	100.86