APPLICATION OF CAPILLARY ISOELECTRIC-FOCUSING WITH ABSORPTION IMAGINGDETECTION TO THE QUANTITATIVE-DETERMINATION OF HUMAN HEMOGLOBIN-VARIANTS

The capillary isoelectric focusing (CIEF)-absorption imaging detector is a multicapillary separation instrument. Several protein samples can be separated and detected in a single run. The analysis time for one run is only 3 min. Because an imaging detector is used, the mobilizati on process of conventional CIEF is not necessary, eliminating such dra wbacks as long analysis time and poor reproducibility in mobilization speed. Human hemoglobin variants were quantitatively determined using the instrument. The peak areas of the analytes were proportional to th eir concentrations in the concentration range of 0-200 mu g/mL. Hemogl obin variant A(2). which only comprises 2% of the whole hemoglobin, ca n be quantitatively determined with a standard deviation of less than 10%. For the high concentration variants, such as variant S, the devia tion is less than 1%.