Radioisotopic assay of serum vitamin B12 with the use of DEAE cellulose

Eugene P. Frenkel, Sue Keller, Mary Sue McCall

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


A radioisotopic assay of vitamin B12 in serum is described. The assay is specifically designed to achieve maximum accuracy in the low serum B12 range in order to better delineate B12-deficient sera from sera with low, but normal, values of B12. The technique, utilizing the principle of saturation analysis, employs Cobalt-57 B12 added to the unknown sera as a tracer for the subsequent determination of per cent recovery of endogenous B12. Endogenous protein-bound B12 is liberated from the test sera, and a suitable quantity of B12-binding protein from pooled sera is added. The bound B12 is quickly separated from the free B12 by batchwise DEAE cellulose adsorption, and the per cent of protein-bound B12 concentration is determined. The procedure is reasonably rapid, is replicable, and is especially suitable for the clarification of borderline B12-deficient states.

Original languageEnglish (US)
Pages (from-to)510-522
Number of pages13
JournalThe Journal of laboratory and clinical medicine
Issue number3
StatePublished - Sep 1 1966

ASJC Scopus subject areas

  • Pathology and Forensic Medicine


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