Abstract
Ternberg and Eakin observed that gastric juice rendered vitamin B12 unavailable to micro-organisms. Much attention has since been given to the binding of the vitamin by mixtures of substances, some of which possess intrinsic factor activity, and also by certain proteins, such as lysozyme, and heparin. However, it has been shown by several workers1 that intensity of binding is not necessarily correlated with intrinsic factor activity. It was shown by Bird and Hoevet that a great variation in vitamin B12-binding capacity of their intrinsic factor concentrate could be demonstrated, depending on the technique employed.
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