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Avidin traps biotin diffusing out of chicken egg yolk

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, ISSN: 0305-0491, Vol: 93, Issue: 3, Page: 543-547
1989
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1.1. The unequal distribution of biotin and biotin-binding proteins between the yolk and albumen of freshly laid chicken eggs provides the potential for time-dependent redistribution of biotin that could affect egg quality, biotin availbaility, and hatchability.2.2. Avidin-bound biotin was measured in albumen next to the shell and next to the yolk in eggs stored up to 23 days.3.3. Biotin bound to biotin-binding proteins (BBP-I and BBP-II) was measured at the center and periphery of yolk from the same eggs.4.4. After 11 days of storage, significant amounts of biotin from the yolk began to accumulate in the albumen adjacent to the yolk.5.5. This transfer is attributed to a change in the vitelline membrane that permits diffusion of biotin, not BBP-I or BBP-II, out of yolk.6.6. The dynamics of this phenomenon suggest that in addition to its antimicrobial role, avidin may be involved in the utilization of biotin by the chick embryo.

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