Table 7. . Stability of enalaprilat under different storage conditions (n = 6).

Serial number	Storage conditions	QC samples (ng/ml)	Mean (ng/ml)	SD	CV (%)	Accuracy (%)
1	Autosampler stability 24 h at 24°C	3	2.6650	0.2892	10.8514	98.5516
		200	187.7900	31.1432	16.5840	93.8950
		400	365.4017	18.0123	4.9295	92.5255
2	Freeze and thaw stability at -20°C (3 cycles)	3	2.3750	0.5358	22.5595	87.8274
		200	177.4900	18.3801	10.3556	95.3222
		400	348.4317	61.8666	17.7557	88.2284
3	Bench top stability for 8 h	3	2.8833	0.3502	12.1460	106.6256
		200	190.4450	22.0556	11.5811	102.2798
		400	387.3033	20.70389	5.3457	98.0713
4	Long-term stability at -20.0°C for 30 days	3	2.4967	0.4318	17.2939	92.3267
		200	196.7650	8.2097	4.1723	105.6740
		400	394.0400	12.4395	3.1569	99.7772