Fig. 5 for batters made with plasma or granules only rather than
with yolk shows that the amount of egg yolk protein extracted in
medium A decreases when samples are withdrawn later in baking.
Both protein populations are thus incorporated in the covalent
protein network. As the decrease in extractability before incorporating
ovalbumin (up to 84 C) is the same for batters made with
plasma or granules only rather than with yolk (results not shown),
both protein fractions may form SS bonds with egg white protein.
Of the plasma protein population, g- and a-livetin are the least
thermostable and probably the first to be incorporated. In the case
of the granules, some vitellin (HDL) may be incorporated but the
peak typical for granules shows a gradual decrease as a result of the
baking process. HDL is probably involved in ionic bonds with
phosvitin, and with it forms small granule micelles (100e200 nm)
(Anton, 2013). This organization may lead to difference in network
formation between vitellin at the edges versus vitellin in the core of
the granule micelle.