We have developed a sensitive and specific isoelectrofocusing (IEF) method for the detection of oligoclonal (OGC) IgM in the cerebrospinal fluid (CSF) and sera. In this procedure, ampholytes, in the range pH 5-8, were used to improve the resolution, and serum was diluted in saline to avoid IgM precipitation. Samples were treated with 50 mM dithiothreitol (DTT) at pH 9.5 to reduce IgM and improve the migration of the protein. Using an anti-IgM labelled with alkaline phosphatase, the limit of detection was found to be 0.1 ng in 5 microl of sample.
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| http://dx.doi.org/10.1016/s0022-1759(01)00492-6 | DOI Listing |
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