Table 3.

Stability of per in Rat Plasma Under Various Storage Conditions (n = 6)

Concentration (ng/mL)	Room Temperature, 4 h		Autosampler 4 °C, 6 h		Three Freeze-thaw		−20 °C, 4 Weeks
	RSD (%)	RE (%)	RSD (%)	RE (%)	RSD (%)	RE (%)	RSD (%)	RE (%)
0.6	6.31	−8.75	4.49	−8.17	4.58	0.56	3.59	−0.69
45	1.24	−0.48	1.72	0.69	1.17	−2.37	4.38	−2.48
450	3.25	−3.70	3.91	−2.89	2.51	−8.85	4.50	−5.56