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. 1972 Apr;25(4):320–325. doi: 10.1136/jcp.25.4.320

A simple assay of intrinsic factor-vitamin B12 complex employing the binding intrinsic factor antibody

Elizabeth Jacob 1, H A W O'Brien 1
PMCID: PMC477302  PMID: 5028639

Abstract

The reaction between binding intrinsic factor antibody and intrinsic factor-vitamin B12 complex has been studied. Initially in the zone of antibody excess, the relationship between the amount of antigen present and the amount of antigen-antibody complex adsorbed onto zirconium phosphate gel was linear. With increasing amounts of antigen, the curve departed from linearity and reached a plateau. The linear portion of the reaction forms the basis of a simple and reproducible assay for quantitating intrinsic factor to which vitamin B12 has already been bound. The assay provides a method for studying the fate of intrinsic factor-vitamin B12 complex during digestion and absorption. In two normal subjects given radioactive vitamin B12 orally, aspiration of ileal contents showed that only 50 to 70% of the radioactivity was bound to intrinsic factor at that level.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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