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. 1989 Oct;49(6):529-35.
doi: 10.3109/00365518909089132.

Cobalamin and its binding protein in rat milk

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Cobalamin and its binding protein in rat milk

L Raaberg et al. Scand J Clin Lab Invest. 1989 Oct.

Abstract

Cobalamin and its binding protein, haptocorrin, are present in rat milk throughout the lactation period. The concentration of cobalamin is approximately 0.3-times the concentration of the unsaturated binding protein. The concentration of the unsaturated cobalamin-binding protein varies between 18 nmol l-1 and 16 nmol l-1. The binding protein has a Stokes radius of 2.49 nm when saturated with cobalamin and 2.61 nm when unsaturated. It binds cobalamin over a broad range of pH and is able to bind cobinamide also. With immunohistochemistry, we find haptocorrin immunoreactivity in the mammary glands and in the sebaceous glands of the nipple.

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