Structural differences, such as particle size, shape and surface characteristics
between in the cookie dough and the sand model system
may explain the variation in migration levels observed. Also, the chocolate
chips baked in sand reached higher temperatures and melted faster
than chocolate chips baked in cookie dough, which may have resulted
in more total oil migration. In addition, unlike cookie dough, the sand
mixtures contained no water. The absence of polar interferences from
water in the sand matrix may allow the fat to migrate more efficiently.
Overall, the complex microstructure of cookie dough may impede fat
migration compared to the simple sand-fat system.