Table 4.

Stability of F-ara-ATP (n=3 except for the ^* marked)

Conditions		% remained	RSD, %
Autosampler 24hr, 10 °C
	Low(1.5ng/mL)	102	2.4
	High(40ng/mL)	102	2.2
PBMC extract 6months, −70 °C
	Low(1.5ng/mL)	114	3.3
	High(40ng/mL)	102	2.8
PBMC extract 12hr, 22 °C
	Low(1.5ng/mL)	104	5.4
	High(40ng/mL)	98.6	8.1
Stock in water, 6months, −70 °C		101	0.9
Stock in water, 1.5hr, 22 °C		1.1*
Stock in 70%MeOH-tris,
	3hr	94.1	1.6
	22hr	69.4	1.4
IS in water 3hr, 22 °C		10.5	7.0
IS in 70% MeOH-tris
	3hr	90.6	1.4
	22hr	70.3	3.8

^*note: F-ara-ATP was degraded in water so quickly that triplicate analysis gave >15% variation.