Table 3.

Stability of PPR in rat plasma (n=6).

Stability tested	Conc. added (ng/mL)	Conc. found (Mean±SD) (ng/mL)	Precision (RSD, %)	Accuracy (RE, %)
At 25 °C for 24 h	10	9.78±0.44	4.49	2.20
	400	402.56±1.98	0.49	−0.64
	1200	1195.69±3.21	0.26	0.43
At 4 °C for 7 days	10	10.35±0.38	3.67	−3.50
	400	397.21±2.56	0.64	0.69
	1200	1204.27±2.84	0.23	−0.35
At −20 ºC for 30 days	10	9.81±0.41	4.17	1.90
	400	405.23±1.58	0.38	−1.30
	1200	1198.07±3.74	0.31	0.16