Table 3.

Stability of puerarin in rat plasma samples (n = 3).

Storage Condition	Concentration (μmol/L)	Mean ± SD	Relative SD (%)
	0.2	0.20 ± 0.02	7.56
4 °C temperature for 24 h	50	53.21 ± 2.20	4.12
	80	82.27 ± 4.04	4.91
	0.2	0.20 ± 0.02	9.51
Room temperature (25 °C) for 24 h	50	51.94 ± 2.18	4.20
	80	80.08 ± 5.38	6.72
	0.2	0.19 ± 0.01	7.51
−40 °C temperature for 30 days	50	51.62 ± 1.88	3.65
	80	81.21 ± 3.42	4.21
	0.2	0.20 ± 0.02	8.01
Three freeze-thaw cycles	50	52.41 ± 2.31	4.41
(each at −40 °C for 24 h)	80	80.56 ± 3.78	4.81