Table 2. Spectrometry and pH of each sample and control solution.

	0 minutes		30 minutes		1 hour		2 hours
Sample	Spectrometry	pH	Spectrometry	pH	Spectrometry	pH	Spectrometry	pH
Vancomycin 10 mg/mL / Oxacillin 20 mg/mL	1.999	6.7	1.999	6.7	1.999	6.5	1.999	6.5
Vancomycin 10 mg/mL / Oxacillin 20 mg/mL	1.850	6.8	1.999	6.8	1.999	6.4	1.999	6.5
Vancomycin 10 mg/mL / Oxacillin 20 mg/mL	1.999	6.5	1.999	6.7	1.900	6.5	1.999	6.5
Vancomycin 10 mg/mL / Oxacillin 20 mg/mL	1.999	6.8	1.999	6.7	1.999	6.5	1.999	6.5
Vancomycin 10 mg/mL	-0.001	3.1	-0.003	3.2	-0.003	3.1	-0.006	3.1
Oxacillin 20 mg/mL	-0.001	7.9	-0.002	7.7	0.002	7.4	-0.005	7.4
Deionized water	0.000	7.2	-0.003	5.5	-0.005	5.4	-0.006	5.4
Sterile water for injection	0.001	6.5	-0.004	6.0	-0.003	6.1	-0.006	5.9
Dextrose 5% in water	0.003	4.3	-0.003	4.4	-0.005	4.4	-0.007	4.3