Table 6. Evaluation of the stability of DAS in rat plasma.

Stability	Concentration added (ng/mL)	Mean recovery (%) ±RSDa
Auto-sampler stability (10°C, 56 h)	3	97.30±5.41
	450	98.47±3.14
Short-term stability (25°C, 6 h)	3	96.13±2.85
	450	97.24±3.83
Long-term stability (-30°C, 30 days)	3	97.93±2.58
	450	97.26±0.81
Freeze-thaw stability (-30°C, 3 cycles)	3	101.43±1.22
	450	99.47±0.24
Refrigerator (4°C, 3 months)	3	99.89±1.76
	450	98.09±3.93

^aMean recovery (%) ± RSD of six determinations.