Table 3.

Intra-day and inter-day precision and accuracy of (S)-ZPF (n = 3).

Spiked (µg/ml)	Intra-day			Inter-day
	Found (µg/ml)	Accuracy (%)	Precision (%)	Found (µg/ml)	Accuracy (%)	Precision (%)
0.1	0.12	117.28	4.14	0.12	118.70	5.64
1	1.11	110.81	2.66	1.10	110.87	2.69
5	4.63	92.65	1.86	4.62	92.77	2.16
10	9.76	97.57	1.11	9.50	95.12	1.18
50	48.19	96.38	0.82	47.59	95.20	1.15