Table 2.

Stability expressed in % recovery and % relative standard deviation for GEM and BET after storage at 5 °C and 25 °C up to 3 days

Intraday (5 °C)
Analyte	Time (hrs)	Concentration [µg/mL]	% Recovery	Standard deviation	%  Relative standard deviation
GEM	0	5	100.78	0.06	1.07
	12	5	100.42	0.05	0.82
BET	0	5	100.72	0.03	0.60
	12	5	101.98	0.08	1.48

Interday (5 °C)
Analyte	Day	Concentration [µg/mL]	% Recovery	Standard deviation	%  Relative standard deviation
GEM	1	5	100.78	0.06	1.07
	2	5	101.25	0.08	1.40
	3	5	100.89	0.07	1.15
BET	1	5	100.72	0.03	0.60
	2	5	100.72	0.03	0.60
	3	5	100.83	0.04	0.67

Intraday (25 °C)
Analyte	Time (hrs)	Concentration [µg/mL]	% Recovery	Standard deviation	%  Relative standard deviation
GEM	0	5	100.784	0.062	1.073
	12	5	100.992	0.030	0.060
BET	0	5	100.724	0.033	0.597
	12	5	101.286	0.048	0.866

Interday (25 °C)
Analyte	Day	Concentration [µg/mL]	% Recovery	Standard deviation	%  Relative standard deviation
GEM	1	5	100.78	0.06	1.07
	2	5	100.46	0.02	0.37
	3	5	100.95	0.00	0.03
BET	1	5	100.72	0.03	0.60
	2	5	100.68	0.02	0.44
	3	5	101.01	0.04	0.67