Table 3.

Results of post-preparative stability tests of target metabolites.

Analyte	Sample	24 h Storage		48 h Storage
		Peak Area, %	Conc 1, %	Peak Area, %	Conc 1, %
Proline	Standard solution	99.17	99.72	123.93	99.22
	Cell lysate	104.67	99.32	112.27	99.23
Arginine	Standard solution	101.25	102.97	118.05	93.24
	Cell lysate	98.12	91.63	100.35	86.64
Glutamic acid	Standard solution	94.66	95.12	118.03	93.97
	Cell lysate	105.47	100.03	111.28	98.27

¹ Conc—concentration value.