TABLE 5.

Coefficient of variation (CV), recovery rates, limit of detection (LOD), and limit of quantitation (LOQ) (all steps of the analysis included) of plasma samples

Quinoxaline	CVa	Recoveryb	LODb	LOQb
	%	%	pmol/ml	pmol/ml
Glucosone	6	109	6.1	18.3
1-DG	4	112	2.2	6.6
3-DG	5	97	5.4	16.2
Lederer's glucosone	—c	114	3.5	10.5
Pentosone	7	98	8.3	24.9
1-DP	9	82	2.5	7.5
3-DP	8	93	3.5	10.5
Threosone	3	90	4.2	12.6
1-DT	3	91	0.5	1.5
3-DT	3	98	2.0	6.0
MGO	8	106	3.0	9.0
GO	9	98	6.9	20.7
Pyruvic acid	2	99	14.1	42.3
Glyoxylic acid	4	92	42.2	126.6
Oxalic acid	7	89	6.8	20.4
3,4-DDP	3	110	0.8	2.4
DHA precursor	—d	—d	2.9	8.7
DHA	10	91	22.9	68.7
2,3-DKG	6	119	6.1	18.3

^a Repeatability conditions, n = 6.

^b Replicate analyses, n = 3.

^c Estimation not possible because analyte was below the limit of detection.

^d Estimation not possible because compound is the intermediate in DHA-Q formation.