Clinical Chemistry
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Clinical Chemistry 28: 485-487, 1982;
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Clinical Chemistry, Vol 28, 485-487, Copyright © 1982 by American Association for Clinical Chemistry

Purification of tracer for somatomedin C radioimmunoassay by hydrophobic interaction chromatography

RC Baxter and AS Brown

We have purified tracer for use in the somatomedin C radioimmunoassay by hydrophobic interaction chromatography. Material showing greatest immunoreactivity binds to Octyl Sepharose CL-4B (Pharmacia) in a buffer mixture consisting of 130 mL of acetonitrile and 870 mL of 0.1 mol/L NH4HCO3, pH 7.8, but is eluted by increasing the acetonitrile content to 180 mL/L. As compared with tracer purified by binding to specific antiserum in liquid phase, precipitating the complex with second antibody, and then dissociating by gel chromatography at acid pH, this tracer shows equal immunoreactivity against specific somatomedin C antiserum. Either preparation allows excellent discrimination between extracts of normal, acromegalic, and hypopituitary plasma samples; thus either is suitable for use in the somatomedin C radioimmunoassay. Tracer purification by hydrophobic interaction chromatography is rapid and inexpensive. It may be useful in preparing highly immunoreactive tracers for other peptide radioimmunoassays.




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Copyright © 1982 by the American Association for Clinical Chemistry.