Table III.

Stability Results of Berberine in Rat Plasma Under Various Storage Conditions (n = 3)

Conditions	Concentration added (ng mL−1)	Concentration found (ng mL−1)	RSD (%)	RE (%)
Room temperature (6 h)	0.2	0.205	6.2	2.7
	200	194	9.7	−3.2
Three freeze-thaw cycles	0.2	0.201	13.2	0.7
	200	195	3.6	−2.7
Autosampler (4°C for 12 h)	0.2	0.204	10.1	2.0
	200	197	5.8	−1.7
2 weeks at −20°C	0.2	0.197	6.2	−1.5
	200	197	9.6	−1.6