Table 2.

Stability of vancomycin in intracellular and extracellular fluids (n = 5).

Treatment	Concentration (mg/mL)	Intracellular fluid		Extracellular fluid
		Founded (mg/mL)	RSD (%)	Founded (mg/mL)	RSD (%)
Storage at −40°C for 3 days	0.01	0.0113 ± 0.0003	2.55	0.0103 ± 0.0006	6.13
	1	1.12 ± 0.03	2.57	1.04 ± 0.02	1.79
	6.4	6.83 ± 0.10	1.50	6.64 ± 0.34	5.18
Three freeze-thaw cycles	0.01	0.0109 ± 0.0009	8.13	0.0105 ± 0.0010	9.36
	1	0.90 ± 0.02	2.20	0.94 ± 0.03	2.83
	6.4	6.35 ± 0.24	3.75	6.88 ± 0.07	1.02
Immediately determine	0.01	0.0105 ± 0.0004	3.75	0.0105 ± 0.0007	6.42
	1	1.05 ± 0.01	1.04	1.12 ± 0.03	2.80
	6.4	6.51 ± 0.54	8.23	6.37 ± 0.05	0.78

Abbreviation: RSD, relative standard deviation.