Fig. 3From: A simple method for plasma total vitamin C analysis suitable for routine clinical laboratory useHigh-pressure liquid chromatogram (measured in UV absorbance units) derived from a plasma sample in which the total vitamin C concentration was 10.7 μmol/L. The ascorbic acid peak eluted 3.1 min after injection onto the column. The two earlier peaks are due to the reagents metaphosphoric acid and EDTA, respectivelyBack to article page