Cookies made with cocoa butter did not follow the trend of bloom
inhibition with increased cookie dough fat content. Even with very
high levels of cocoa butter added to cookie dough, the amount of
bloom formed on chocolate chips did not change. The driving force
for oil migration is the compositional difference between the two
phases in contact with each other. If the fat in each phase is the
same, no net migration will occur. Ziegler et al. (2004) demonstrated
this by storing chocolate samples on filter paper saturated with
cocoa butter. He found that no net migration occurred for a system
containing only cocoa butter, whereas migration did occur when the
filter paper was saturated with a fat other than cocoa butter. Furthermore,
Kleinert (1970) found when cocoa butter centers were enrobed
with chocolate and stored for 36 months under conditions designed
to encourage bloom formation on enrobed chocolates, no bloom occurred,
indicating that no net oil migration had occurred and the composition
of the chocolate was not changed. Had significant net oil
migration taken place, bloom likely would have formed.
Cookies made with cocoa butter did not follow the trend of bloominhibition with increased cookie dough fat content. Even with veryhigh levels of cocoa butter added to cookie dough, the amount ofbloom formed on chocolate chips did not change. The driving forcefor oil migration is the compositional difference between the twophases in contact with each other. If the fat in each phase is thesame, no net migration will occur. Ziegler et al. (2004) demonstratedthis by storing chocolate samples on filter paper saturated withcocoa butter. He found that no net migration occurred for a systemcontaining only cocoa butter, whereas migration did occur when thefilter paper was saturated with a fat other than cocoa butter. Furthermore,Kleinert (1970) found when cocoa butter centers were enrobedwith chocolate and stored for 36 months under conditions designedto encourage bloom formation on enrobed chocolates, no bloom occurred,indicating that no net oil migration had occurred and the compositionof the chocolate was not changed. Had significant net oilmigration taken place, bloom likely would have formed.
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