Table 1.

Degradation of nucleotides during sample preparation assessed by LC-ESI-MS/MS. Each parameter is represented as percentages of total adenosine nucleotides (left) and guanosine nucleotides (right) remaining after the analysis. n = 3, mean ± SD.

	ATP addition	ADP addition		GTP addition	GDP addition
ATP	93.400 ± 0.849	1.350 ± 0.495	GTP	92.700 ± 3.394	1.300 ± 0.424
ADP	6.050 ± 1.845	98.150 ± 0.636	GDP	5.600 ± 3.536	96.950 ± 1.061
AMP	0.550 ± 0.636	0.350 ± 0.354	GMP	1.650 ± 0.212	1.750 ± 0.636