A New Method to Simultaneously Quantify the Antioxidants: Carotenes, Xanthophylls, and Vitamin A in Human Plasma

Table 3

Intra- and interday precision.

Analyte	Precision
	1,5 µg/mL ()				6 µg/mL ()				9 µg/mL ()
	Day 1; (RSD %)	Day 2; (RSD %)	Day 3; (RSD %)	RSD Interday	Day 1; (RSD %)	Day 2; (RSD %)	Day 3; (RSD %)	RSD Interday	Day 1; (RSD %)	Day 2; (RSD %)	Day 3; (RSD %)	RSD Interday
Retinol	3	4	5	4.9	10	12	8	14.1	13	10	11	14.3
Astaxanthin	7	3	3	14.5	11	13	12	14.6	15	12	12	14.7
Lutein	8	9	4	14.2	12	14	8	14.3	10	9	12	13.3
Zeaxanthin	4	15	4	10.8	12	3	7	12.9	11	11	10	14.8
E--apo-8′-carotenal	11	10	4	14.3	11	12	8	14.7	13	9	12	13.8
Cryptoxanthin	5	13	3	12.1	11	6	9	14.3	11	10	8	13.9
15-Z--carotene	5	13	1	9.4	11	5	9	15.1	10	7	11	13.4
13-Z--carotene	6	14	3	14.9	12	15	12	14.0	11	10	10	14.9
-carotene	4	15	2	9.4	11	15	11	13.7	11	9	10	14.8
-carotene	11	10	8	11.2	11	15	14	14.9	12	6	10	12.8
9-Z--carotene	6	10	7	10.4	12	12	4	13.9	11	11	11	14.8
E-lycopene	5	5	2	11.6	10	13	9	13.8	10	15	8	14.8

N.d.: not determined.
RSD: relative standard deviation.