Determination of haemoglobin Alcby iso-electric focusing. Effect of incubation of erythrocytes and comparison of results obtained by ion-exchange chromatography

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Abstract
Blood samples from 24 non-diabetics and 26 diabetics were analysed using both thin layer iso-electric focusing and ion-exchange chromatography. Using iso-electric focusing it was found that about 10% of haemoglobin Alc (0.7—1.2% of total haemoglobin) could be removed by a preceding incubation of the erythrocytes in saline at 37°C for 6 h. When glucose was added to the incubation medium in a final concentration of 25 mmol/l no decline was seen in the concentration of haemoglobin Alc. Using similar treatment of erythrocytes identical results were obtained by the two methods. A reference interval for normal subjects (age range 6 months to 65 years) was established for the iso-electric focusing method using non-incubated samples.